[PD2] Server done?

Co-authored-by: tsousa111 <tiagao2001@hotmail.com>
2024-05-28 20:08:25 +01:00 · 2024-05-28 20:08:25 +01:00 · 49a29e43a7
commit 49a29e43a7
parent 08a73a4f76
66 changed files with 2777 additions and 5 deletions
--- a/Projs/PD1/internal/server/datastore.go
+++ b/Projs/PD1/internal/server/datastore.go
@ -90,7 +90,7 @@ func (ds DataStore) GetMessage(toUID string, position int) protocol.Packet {
 	err := row.Scan(&serverMessage.FromUID, &serverMessage.ToUID, &serverMessage.Subject, &serverMessage.Body, &serverMessage.Timestamp)
 	if err == sql.ErrNoRows {
 		log.Printf("No message with NUM %v for UID %v\n", position, toUID)
-		errorMessage := fmt.Sprintf("MSG SERVICE: unknown message!")
+		errorMessage := fmt.Sprintln("MSG SERVICE: unknown message!")
 		return protocol.NewReportErrorPacket(errorMessage)
 	}

@ -217,7 +217,7 @@ func (ds DataStore) userExists(uid string) bool {
 	err := ds.db.QueryRow(query, uid).Scan(&count)
 	if err != nil || count == 0 {
 		log.Printf("user with UID %v does not exist\n", uid)
-        return false
+		return false
 	}
 	return true
 }
--- a/Projs/PD1/internal/server/server.go
+++ b/Projs/PD1/internal/server/server.go
@ -7,8 +7,6 @@ import (
 	"log"
 )

-//TODO: LOGGING SYSTEM
-
 func clientHandler(connection networking.Connection[protocol.Packet], dataStore DataStore) {
 	defer connection.Conn.Close()

--- a/Projs/PD1/server.db
+++ b/Projs/PD1/server.db
--- a/Projs/PD2/README.md
+++ b/Projs/PD2/README.md
@ -0,0 +1,214 @@
+# Relatório do Projeto de Desenvolvimento 1
+
+## Introdução
+
+A comunicação eficaz dentro de uma organização é essencial para a eficiência do seu funcionamento. No entanto, num ambiente cada vez mais digital, garantir a segurança e autenticidade das comunicações tem-se vindo a tornar uma preocupação fundamental. Em resposta a esta necessidade, este primeiro projeto de desenvolvimento visa criar um serviço de mensagens seguro e autenticado.
+
+Para contextualizar o projeto, consideremos uma organização onde informações confidenciais são frequentemente trocadas entre membros de equipas distribuídas geograficamente. Neste cenário, é crucial que as mensagens enviadas e recebidas sejam protegidas contra acessos não autorizados e manipulação por partes externas. Além disso, garantir que a identidade do remetente e a integridade da mensagem sejam verificadas é essencial para manter a confiança e a segurança das comunicações internas.
+
+Perante estas necessidades, o projeto de desenvolvimento propõe a criação de um sistema cliente/servidor que oferece um serviço de mensagens seguro e autenticado. Através deste sistema, os membros da organização poderão trocar mensagens com garantias de autenticidade, protegendo assim a confidencialidade e integridade das comunicações.
+
+Ao longo deste relatório iremos detalhar as decisões mais importantes tomadas no desenvolvimento do projeto, bem como as medidas de segurança implementadas para garantir a confidencialidade, integridade e autenticidade das mensagens trocadas entre os utilizadores.
+
+Algumas notas sobre o projeto:
+
+- Optamos por escolher **Golang** como linguagem visando uma implementação mais eficiente, robusta e segura ao nível de concorrência. O modelo de concorrência baseado em goroutines e canais facilita a criação de programas concorrentes e sistemas distribuídos. Com uma sintaxe simples, semelhante a **C**, o **Go** promove a escrita de código legível e de alta qualidade. Além disso, o **Go** possui um ecossistema robusto de bibliotecas e ferramentas, tornando-o uma escolha adequada para o desenvolvimento de sistemas distribuídos e serviços de back-end.
+
+- Implementamos algumas funcionalidades extra, como o armazenamento dos dados no servidor numa base de dados **sqlite3**
+
+Nas secções seguintes iremos detalhar cada componente do sistema, bem como as funcionalidades implementadas.
+
+
+
+## Análise de Risco
+
+Esta análise de risco do sistema visa identificar as potenciais vulnerabilidades e ameaças que possam comprometer a segurança do sistema de mensagens. É essencial considerar os diversos fatores que podem impactar a integridade, confidencialidade e disponibilidade das mensagens trocadas entre os utilizadores.
+
+### Potenciais Vulnerabilidades
+
+1. **Comunicação Não Segura** - Se a comunicação entre os clientes e o servidor não foi cifrada, qualquer *man in the middle* consegue ler o conteúdo a ser transmitido.
+
+1. **Armazenamento Inseguro de Chaves Privadas** - Se as chaves privadas dos utilizadores forem armazenadas de forma inadequada, como em arquivos desprotegidos, existe o risco de acesso não autorizado, comprometendo a segurança e autenticidade das mensagens.
+
+1. **Autenticação Fraca** - Um sistema de autenticação vulnerável pode permitir que utilizadores mal-intencionados obtenham acesso não autorizado às contas dos utilizadores legítimos.
+
+1. **Manipulação de Mensagens** - A ausência de mecanismos eficazes de controlo pode facilitar a manipulação do conteúdo das mensagens durante a transmissão, comprometendo sua integridade.
+
+1. **Vulnerabilidades de *Software*** - Falhas de segurança no *software* desenvolvido e utilizado para implementar o sistema podem ser exploradas para obter acesso não autorizado ou comprometer a segurança dos dados.
+
+### Possíveis Ameaças:
+
+1. **Ataques de Intercetação de Dados** - Atacantes podem tentar intercetar a comunicação entre o cliente e o servidor para obter informações sensíveis, como chaves privadas ou conteúdo de mensagens.
+
+1. **Ataques de *Denial of Service (DOS)*** - Um ataque de *DOS* pode tornar o servidor inacessível ao sobrecarregá-lo com um grande volume de solicitações, prejudicando a disponibilidade do serviço.
+
+1. **Ataques de Engenharia Social:** - Atacantes podem tentar manipular os utilizadores legítimos para obter acesso às suas credenciais de acesso por meio de técnicas de engenharia social.
+
+1. **Exploração de Vulnerabilidades de *Software*:** - Vulnerabilidades conhecidas ou desconhecidas no *software* utilizado podem ser exploradas para comprometer a segurança do sistema.
+
+### Propriedades Requiridas:
+
+1. **Autenticidade do Remetente** - O cliente deseja ter a garantia de que a mensagem recebida foi realmente enviada pelo remetente indicado.
+
+1. **Confidencialidade das Mensagens** - O cliente quer assegurar que apenas ele possui a capacidade de decifrar as mensagens que lhe foram enviadas, garantindo assim a privacidade das comunicações.
+
+1. **Servidor Malicioso** - Os clientes pretendem proteger-se contra a possibilidade de o servidor agir de forma maliciosa, garantindo que as suas interações sejam seguras e protegidas, necessitando de mecanismos que garantam a segurança das suas interações independentemente da confiabilidade do servidor, como a utilização de criptografia *end-to-end*.
+
+1. **Comunicação Segura com o Servidor** - Os clientes exigem que a comunicação com o servidor seja segura, protegida contra acesso não autorizado e intercetação por partes não autorizadas, garantindo assim a integridade e confidencialidade dos dados transmitidos.
+
+### Medidas de Mitigação:
+
+1. **Protocolo de comunicação** - Utilizar um protocolo de comunicação que garanta a confidencialidade para proteger a comunicação entre o cliente e o servidor.
+
+1. **Armazenamento Seguro de Chaves Privadas** - Adotar práticas seguras de armazenamento para proteger as chaves privadas dos utilizadores contra acesso não autorizado, como utilizar *passphrases* para proteger o acesso à *key store*.
+
+1. **Fortalecimento da Autenticação** - Implementar métodos robustos de autenticação, como certificados digitais, para garantir a identidade dos utilizadores e proteger contra acesso não autorizado.
+
+1. **Validação de Dados** - Implementar controles de validação de dados para garantir a integridade das mensagens e prevenir a manipulação de dados por partes não autorizadas, como, por exemplo, assinar "hashes" das mensagens enviadas.
+
+1. **Atualizações de *Software*** - Manter o *software* utilizado atualizado para mitigar o risco de exploração de vulnerabilidades conhecidas e garantir a segurança do sistema.
+
+Esta breve análise de risco destaca a importância de identificar e mitigar potenciais vulnerabilidades e ameaças para garantir a segurança do sistema desenvolvido. A implementação de medidas de segurança adequadas é essencial para proteger os dados e garantir o funcionamento seguro.
+
+
+## Decisões de Arquitetura e Implementação
+
+Tendo em consideração as vulnerabilidades e ameaças identificadas na análise de risco, foram tomadas várias decisões de design e implementação para garantir a segurança e autenticidade do sistema de mensagens. As decisões tomadas visam proteger a confidencialidade, integridade e autenticidade das mensagens trocadas entre os utilizadores, bem como garantir a segurança da comunicação entre o cliente e o servidor.
+
+1. **TLS (Transport Layer Security)**
+
+   - Cada conexão entre cliente e servidor é protegida pelo protocolo TLS, garantindo que a comunicação seja segura e privada.
+   - Cliente e servidor trocam certificados para autenticar as suas identidades.
+   - Ambos verificam se o certificado foi emitido pela Autoridade de Certificação (CA) central.
+   - O cliente verifica se comunica com o servidor legítimo.
+
+1. **End-to-End Encryption (E2EE)**
+
+   - Ao enviar uma mensagem, o cliente assina a *hash* do texto simples com a sua chave privada.
+   - A assinatura é anexada ao texto limpo e esse conjunto é cifrado com uma chave de sessão gerada aleatoriamente.
+   - A chave de sessão é cifrada com a chave pública do destinatário, Isso garante que apenas o destinatário possa decifrar a mensagem.
+
+1. **Visualização da Lista de Mensagens Não Lidas**
+
+   - Quando um cliente solicita a sua lista de mensagens não lidas, apenas o assunto é enviado, não o conteúdo cifrado.
+   - O cliente deve decifrar o assunto para visualizá-lo.
+
+1. **Visualização de Mensagens**
+
+   - Quando um cliente solicita uma mensagem, é enviado o conteúdo todo da mensagem.
+   - O cliente deve decifrar o assunto e o corpo da mensagem para visualizá-los.
+
+1. **Troca de Chaves Públicas**
+
+   - Quando um cliente precisa da chave pública de outro cliente, solicita o certificado desse cliente ao servidor.
+   - Verifica-se se o certificado foi emitido pela CA central e se pertence ao cliente desejado.
+
+1. **Verificação de Inputs**
+
+   - Tanto cliente quanto servidor realizam verificações básicas nos *inputs* para garantir a sua integridade.
+   - Ambos desconfiam um do outro e verificam cuidadosamente todos os *inputs*.
+
+1. **Confiança na CA Central**
+
+   - A única confiança absoluta neste sistema é depositada na Autoridade de Certificação central, responsável por emitir os certificados.
+
+
+## Certificates and Keys
+
+Para gerar os certificados e chaves necessárias para a comunicação segura entre o cliente e o servidor, foram seguidos os seguintes passos utilizando a ferramenta **OpenSSL**. Estes passos incluem a geração de chaves privadas, certificados e *keystores* para o servidor e clientes, bem como a assinatura dos certificados pela CA central.
+
+
+1. **Gerar *CA key* e o *certificate***
+
+```bash
+openssl genrsa -aes256 -out CA/CA.key 4096
+openssl req -x509 -new -nodes -key CA/CA.key -sha256 -days 18250 -out CA/CA.pem -subj "/2.5.4.3=CA"
+```
+A *passhphrase* da CA é 1234
+
+2. **Gerar a *server key* e *CSR***
+
+```bash
+openssl genrsa -out server/server.key 4096
+openssl req -new -key server/server.key -out server/server.csr -subj "/2.5.4.11=MSG SERVICE/2.5.4.65=SERVER"
+```
+
+3. **Assinar o *CSR* do *server* com a *CA***
+
+```bash
+openssl x509 -req -in server/server.csr -CA CA/CA.pem -CAkey CA/CA.key -CAcreateserial -out server/server.crt -days 1825 -sha256
+```
+
+4. **Gerar o *keystore* do *server***
+
+```bash
+openssl pkcs12 -export -out server/server.p12 -inkey server/server.key -in server/server.crt -certfile CA/CA.pem -name "ServerKeyStore"
+```
+A passphrase usada para o *keystore* é server
+
+5. **Gerar as chaves e *CSR* de cada *client***
+
+```bash
+openssl genrsa -out client{NUM}/client{NUM}.key 4096
+openssl req -new -key client{NUM}/client{NUM}.key -out client{NUM}/client{NUM}.csr -subj "/2.5.4.11=MSG SERVICE/2.5.4.65=CL{NUM}/2.5.4.3=Client {NUM}"
+```
+
+6. **Assinar os *CSR* dos clientes com a *CA***
+
+```bash
+openssl x509 -req -in client/client.csr -CA CA/CA.pem -CAkey CA/CA.key -CAcreateserial -out client/client.crt -days 1825 -sha256
+```
+7. **Gerar o *keystore* do *client***
+
+```bash
+openssl pkcs12 -export -out client{NUM}/client{NUM}.p12 -inkey client{NUM}/client{NUM}.key -in client{NUM}/client{NUM}.crt -certfile CA/CA.pem -name "Client{NUM}KeyStore"
+```
+A passphrase usada para o *keystore* é client{NUM}
+
+Neste processo, foram geradas as chaves privadas, certificados e *keystores* necessários para estabelecer uma comunicação segura entre os clientes e o servidor. Os certificados foram assinados pela Autoridade de Certificação (CA) central, garantindo a autenticidade e integridade dos certificados emitidos. Os *keystores* contêm tanto o certificado quanto a chave privada do cliente ou servidor, protegidos por *passhprase* para garantir a confidencialidade e segurança das chaves privadas. Este processo de geração de certificados e *keystores* é essencial para estabelecer uma comunicação segura e autenticada entre os componentes do sistema.
+
+### Certificados
+- **Autenticidade**: Os certificados são assinados digitalmente pela Autoridade de Certificação (CA) central, garantindo sua autenticidade. Isso significa que os clientes podem verificar se o certificado foi emitido por uma entidade confiável.
+- **Criptografia**: Os certificados contêm a chave pública do cliente ou do servidor, que é usada para estabelecer uma comunicação segura por meio de criptografia assimétrica. Isso permite que as mensagens sejam cifradas pelo remetente e decifradas apenas pelo destinatário.
+- **Verificação**: Antes de confiar num certificado, os clientes verificam sua validade, incluindo a data de expiração e a correspondência com a entidade emissora. Isso ajuda a evitar a utilização de certificados inválidos ou falsificados.
+
+### *Keystores*
+- **Armazenamento Seguro**: Os *keystores* são arquivos protegidos por *passphrase* que contêm tanto o certificado quanto a chave privada do cliente ou servidor. Essas informações sensíveis são protegidas por meio de criptografia, garantindo que apenas o proprietário autorizado possa acessá-las.
+- **Proteção da Chave Privada**: A *passphrase* do *keystore* protege a chave privada contra acesso não autorizado. Isso é crucial, pois a chave privada é usada para decifrar as mensagens recebidas e assinar as mensagens enviadas, garantindo a autenticidade e integridade da comunicação.
+- **Confidencialidade**: Como os *keystores* são protegidos por *passphrase*, mesmo que alguém obtenha acesso ao arquivo, não poderá extrair a chave privada sem a *passphrase* correta. Isso ajuda a manter a confidencialidade das chaves privadas dos usuários.
+
+
+## Criptografia
+
+É importante destacar que, para garantir a segurança e integridade das mensagens, implementamos um protocolo de comunicação seguro. Este protocolo utiliza tanto criptografia simétrica quanto assimétrica. As mensagens são cifradas com uma chave de sessão gerada aleatoriamente, que, é cifrada com a chave pública do destinatário para garantir a confidencialidade. As mensagens são também assinadas com a chave privada do emissor para autenticidade. Dessa forma, asseguramos que as mensagens sejam protegidas contra acessos não autorizados e que a sua origem possa ser verificada.
+
+![Digital Envelope](report_content/digital-envelope-diagram.jpg)
+
+
+### Networking
+
+O canal de comunicação estabelecido entre o cliente e o servidor nesta implementação garante uma troca de dados segura e criptografada utilizando o protocolo TLS (Transport Layer Security). Ambos, cliente e servidor, empregam configurações TLS para cifrar os dados durante a transmissão, assegurando confidencialidade e integridade. Durante o handshake TLS, o servidor valida o certificado do cliente para verificar sua autenticidade, prevenindo acessos não autorizados. Este mecanismo robusto de segurança protege o canal de comunicação contra escutas, adulterações e ataques do tipo "man in the middle", garantindo uma troca de informações segura e confiável entre o cliente e o servidor.
+
+### Protocolo de Comunicação
+
+O package **protocol.go** define um conjunto de estruturas e funções que representam os diferentes tipos de pacotes que podem ser transmitidos entre o cliente e o servidor. Cada tipo de pacote é representado por uma constante PacketType, que indica a natureza da informação contida no pacote através de uma **flag**.
+
+As estruturas de dados definidas, como `GetUserCert`, `GetUnreadMsgsInfo`, `GetMsg`, `SendMsg`, `AnswerGetUserCert`, `AnswerGetUnreadMsgsInfo` e `AnswerGetMsg`, descrevem os formatos específicos de cada tipo de pacote a ser enviado e recebido. Cada estrutura contém os campos necessários para armazenar e representar os dados associados a cada tipo de pacote.
+
+Além disso, foram implementadas funções auxiliares para criar instâncias de cada tipo de pacote, como `NewGetUserCert`, `NewGetUnreadMsgsInfo`, `NewGetMsg`, `NewSendMsg`, `NewAnswerGetUserCert`, `NewAnswerGetUnreadMsgsInfo` e `NewAnswerGetMsg`. Estas funções facilitam a criação de pacotes com os dados necessários de forma estruturada.
+
+Para facilitar a serialização e desserialização dos pacotes em formato JSON, foram implementadas funções `Unmarshal` específicas para cada tipo de pacote. Estas funções convertem os dados do pacote entre o formato JSON e as estruturas de dados correspondentes, permitindo a comunicação eficiente entre o cliente e o servidor.
+
+Este package serve como uma camada de abstração que facilita a comunicação entre os componentes cliente e servidor, garantindo que os dados sejam transmitidos de forma estruturada e *standardized*, facilitando o desenvolvimento, manutenção e expansão do sistema de comunicação.
+
+### Sqlite3 Database
+
+Como mencionado anteriormente neste relatório, uma das funcionalidades adicionais implementadas foi o armazenamento dos dados do servidor numa base de dados persistente. Neste projeto, optamos por utilizar o **SQLite3**. Este é utilizado para armazenar as mensagens enviadas e recebidas pelos utilizadores, além dos certificados digitais dos clientes. A escolha de uma base de dados permite a persistência segura e eficiente dos dados, assegurando que as mensagens e certificados sejam armazenados de maneira duradoura e acessível.
+
+Em relação à segurança contra ataques como *SQL Injection*, é crucial adotar medidas para mitigar esse tipo de ameaça. A utilização de *prepared statements* é uma prática essencial para prevenir ataques deste tipo. Com *prepared statements*, os valores dos parâmetros são tratados como dados e não como parte do comando SQL, o que reduz significativamente o risco de injeção de código malicioso. Essa abordagem fortalece a segurança do sistema, garantindo a integridade e confiabilidade das operações da base de dados.
+
+
+
+### Verificações e Testes de Segurança
+
+Para realizar testes e verificações de segurança implementamos também um *Fake Client, Server e CA*, que permitem testar a segurança do sistema em diferentes cenários, como tentativas de intercetação de dados, manipulação de mensagens, autenticação fraca e outros tipos de ataques.
--- a/Projs/PD2/certs/CA/CA.key
+++ b/Projs/PD2/certs/CA/CA.key
@ -0,0 +1,54 @@
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+-----END ENCRYPTED PRIVATE KEY-----
--- a/Projs/PD2/certs/CA/CA.pem
+++ b/Projs/PD2/certs/CA/CA.pem
@ -0,0 +1,29 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
--- a/Projs/PD2/certs/CA/CA.srl
+++ b/Projs/PD2/certs/CA/CA.srl
@ -0,0 +1 @@
+7C475B59D1510F54E042BF4BFDBE811BF4EDAF37
--- a/Projs/PD2/certs/FakeCA/CA.key
+++ b/Projs/PD2/certs/FakeCA/CA.key
@ -0,0 +1,54 @@
+-----BEGIN ENCRYPTED PRIVATE KEY-----
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+-----END ENCRYPTED PRIVATE KEY-----
--- a/Projs/PD2/certs/FakeCA/CA.pem
+++ b/Projs/PD2/certs/FakeCA/CA.pem
@ -0,0 +1,29 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
--- a/Projs/PD2/certs/FakeCA/CA.srl
+++ b/Projs/PD2/certs/FakeCA/CA.srl
@ -0,0 +1 @@
+7F4C6BBD8E095E37521D85095EBE463D9916EFB7
--- a/Projs/PD2/certs/FakeClient1/client1.crt
+++ b/Projs/PD2/certs/FakeClient1/client1.crt
@ -0,0 +1,30 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
--- a/Projs/PD2/certs/FakeClient1/client1.csr
+++ b/Projs/PD2/certs/FakeClient1/client1.csr
@ -0,0 +1,26 @@
+-----BEGIN CERTIFICATE REQUEST-----
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+-----END CERTIFICATE REQUEST-----
--- a/Projs/PD2/certs/FakeClient1/client1.key
+++ b/Projs/PD2/certs/FakeClient1/client1.key
@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----
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+-----END PRIVATE KEY-----
--- a/Projs/PD2/certs/FakeClient1/client1.p12
+++ b/Projs/PD2/certs/FakeClient1/client1.p12
--- a/Projs/PD2/certs/FakeServer/server.crt
+++ b/Projs/PD2/certs/FakeServer/server.crt
@ -0,0 +1,29 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
--- a/Projs/PD2/certs/FakeServer/server.csr
+++ b/Projs/PD2/certs/FakeServer/server.csr
@ -0,0 +1,26 @@
+-----BEGIN CERTIFICATE REQUEST-----
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+-----END CERTIFICATE REQUEST-----
--- a/Projs/PD2/certs/FakeServer/server.key
+++ b/Projs/PD2/certs/FakeServer/server.key
@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----
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+-----END PRIVATE KEY-----
--- a/Projs/PD2/certs/FakeServer/server.p12
+++ b/Projs/PD2/certs/FakeServer/server.p12
--- a/Projs/PD2/certs/FakeServer/server/server.crt
+++ b/Projs/PD2/certs/FakeServer/server/server.crt
@ -0,0 +1,30 @@
+-----BEGIN CERTIFICATE-----
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+Ew1HJZjVMjj/
+-----END CERTIFICATE-----
--- a/Projs/PD2/certs/FakeServer/server/server.csr
+++ b/Projs/PD2/certs/FakeServer/server/server.csr
@ -0,0 +1,27 @@
+-----BEGIN CERTIFICATE REQUEST-----
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+-----END CERTIFICATE REQUEST-----
--- a/Projs/PD2/certs/FakeServer/server/server.key
+++ b/Projs/PD2/certs/FakeServer/server/server.key
@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----
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+-----END PRIVATE KEY-----
--- a/Projs/PD2/certs/FakeServer/server/server.p12
+++ b/Projs/PD2/certs/FakeServer/server/server.p12
--- a/Projs/PD2/certs/README.md
+++ b/Projs/PD2/certs/README.md
@ -0,0 +1,48 @@
+# Generating keys
+
+1. Generate CA key and certificate:
+
+```bash
+openssl genrsa -aes256 -out CA/CA.key 4096
+openssl req -x509 -new -nodes -key CA/CA.key -sha256 -days 18250 -out CA/CA.pem -subj "/2.5.4.3=CA"
+```
+The CA passphrase is 1234
+
+2. Generate server key and CSR:
+
+```bash
+openssl genrsa -out server/server.key 4096
+openssl req -new -key server/server.key -out server/server.csr -subj "/2.5.4.11=MSG SERVICE/2.5.4.65=SERVER"
+```
+
+3. Sign the server CSR with CA:
+
+```bash
+openssl x509 -req -in server/server.csr -CA CA/CA.pem -CAkey CA/CA.key -CAcreateserial -out server/server.crt -days 1825 -sha256
+```
+
+4. Generate the server's keystore:
+
+```bash
+openssl pkcs12 -export -out server/server.p12 -inkey server/server.key -in server/server.crt -certfile CA/CA.pem -name "ServerKeyStore"
+```
+The passphrase used for the keystore is server
+
+5. Generate each client's key and CSR:
+
+```bash
+openssl genrsa -out client{NUM}/client{NUM}.key 4096
+openssl req -new -key client{NUM}/client{NUM}.key -out client{NUM}/client{NUM}.csr -subj "/2.5.4.11=MSG SERVICE/2.5.4.65=CL{NUM}/2.5.4.3=Client {NUM}"
+```
+
+6. Sign the client CSR with CA:
+
+```bash
+openssl x509 -req -in client/client.csr -CA CA/CA.pem -CAkey CA/CA.key -CAcreateserial -out client/client.crt -days 1825 -sha256
+```
+7. Generate the client's keystore:
+
+```bash
+openssl pkcs12 -export -out client{NUM}/client{NUM}.p12 -inkey client{NUM}/client{NUM}.key -in client{NUM}/client{NUM}.crt -certfile CA/CA.pem -name "Client{NUM}KeyStore"
+```
+The passphrase used for the keystore is client{NUM}
--- a/Projs/PD2/certs/client1/client1.crt
+++ b/Projs/PD2/certs/client1/client1.crt
@ -0,0 +1,30 @@
+-----BEGIN CERTIFICATE-----
+MIIFFDCCAvygAwIBAgIUfEdbWdFRD1TgQr9L/b6BG/TtrzUwDQYJKoZIhvcNAQEL
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+-----END CERTIFICATE-----
--- a/Projs/PD2/certs/client1/client1.csr
+++ b/Projs/PD2/certs/client1/client1.csr
@ -0,0 +1,26 @@
+-----BEGIN CERTIFICATE REQUEST-----
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+-----END CERTIFICATE REQUEST-----
--- a/Projs/PD2/certs/client1/client1.key
+++ b/Projs/PD2/certs/client1/client1.key
@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----
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+-----END PRIVATE KEY-----
--- a/Projs/PD2/certs/client1/client1.p12
+++ b/Projs/PD2/certs/client1/client1.p12
--- a/Projs/PD2/certs/client2/client2.crt
+++ b/Projs/PD2/certs/client2/client2.crt
@ -0,0 +1,30 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
--- a/Projs/PD2/certs/client2/client2.csr
+++ b/Projs/PD2/certs/client2/client2.csr
@ -0,0 +1,26 @@
+-----BEGIN CERTIFICATE REQUEST-----
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+-----END CERTIFICATE REQUEST-----
--- a/Projs/PD2/certs/client2/client2.key
+++ b/Projs/PD2/certs/client2/client2.key
@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----
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+-----END PRIVATE KEY-----
--- a/Projs/PD2/certs/client2/client2.p12
+++ b/Projs/PD2/certs/client2/client2.p12
--- a/Projs/PD2/certs/client3/client3.crt
+++ b/Projs/PD2/certs/client3/client3.crt
@ -0,0 +1,30 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
--- a/Projs/PD2/certs/client3/client3.csr
+++ b/Projs/PD2/certs/client3/client3.csr
@ -0,0 +1,26 @@
+-----BEGIN CERTIFICATE REQUEST-----
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+-----END CERTIFICATE REQUEST-----
--- a/Projs/PD2/certs/client3/client3.key
+++ b/Projs/PD2/certs/client3/client3.key
@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----
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+-----END PRIVATE KEY-----
--- a/Projs/PD2/certs/client3/client3.p12
+++ b/Projs/PD2/certs/client3/client3.p12
--- a/Projs/PD2/certs/server/server.crt
+++ b/Projs/PD2/certs/server/server.crt
@ -0,0 +1,29 @@
+-----BEGIN CERTIFICATE-----
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+CwUAA4ICAQCIYQ5e0FbeZKwjdktLHw0cnGA3aVZhjbxJKU8rcDzeKDDH5SkwS25U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+-----END CERTIFICATE-----
--- a/Projs/PD2/certs/server/server.csr
+++ b/Projs/PD2/certs/server/server.csr
@ -0,0 +1,26 @@
+-----BEGIN CERTIFICATE REQUEST-----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+33uWuZEokqwWaNc08h3mRtS1sLzcSQ9161iVzKJB44e6dWM/jqCZippNVWI0Skiu
+UfP+uoYVuv1U9lEjX8cz54mL7iOs5snXJVpt8oO17zKozfLAyCFygU+gUNNnh/K/
+T3EtvI7TlAAFMpYi5q95D4Mj3j6l2P0WcoLFrytCtRnLic6NCE5HYj2vScGN9WCh
+GWcs4h+2MIY/VTxzn6AP82zXsJRusdfHoVAP/MDnP8YeIU9gtbWTJCl9DmdHQYp3
+Xw6/TBCQwnQhbGquHVl4WFj8aO7Mm3jtVm5eLTRXNMCYPvqbOlaeeKZRsJkoyInf
+gYj+LTZ2ke4moZ00tG4PwSvTj1CKuswa6HfB5l1UHmCuEhm4saS6MbgORj6UHh0W
+L7gLtdUINzu/7KE3ZTI+d4kgpM2QFozjTa5SRYCBkZh/WhRMbI1lleWFw2dKFuyJ
+IxJPaCw5XRVz8TM2jAEMqPSA9hhwhKl42ieQKMbBTqU=
+-----END CERTIFICATE REQUEST-----
--- a/Projs/PD2/certs/server/server.key
+++ b/Projs/PD2/certs/server/server.key
@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----
+MIIJQgIBADANBgkqhkiG9w0BAQEFAASCCSwwggkoAgEAAoICAQDZ8UyditeVDys/
+A6swcUJEdsl7p8Vv5m5VxcFqR7Ejdrh3y6dAkp4SpVfk86d0Qo0RFQ9c5wauJ9Xt
+6HF+YX/qgrZfHi4isseJtXReMBdjthxNCP5qjXwGB1V2tSLtxLxhjLIqhP5I/4aQ
+RVgXm8kSChNHLWF1BAtlinkCqyqgFtevitVpR1cMPxzXNYzBbo0YMhdZ7R4AwxfK
+OolGR1ncU7j7ndjhmDapR4XUZwNFqbILR0bKQd5iZqXL0za07oyHC6H7CUwRuPnn
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+FNkGULsIGgHpbvLXQlrzTuHSYdsyRX4UBVt9jyrbACxSrck9aLOrqln52BqkOZnT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+-----END PRIVATE KEY-----
--- a/Projs/PD2/certs/server/server.p12
+++ b/Projs/PD2/certs/server/server.p12
--- a/Projs/PD2/cmd/client/client.go
+++ b/Projs/PD2/cmd/client/client.go
@ -0,0 +1,9 @@
+package main
+
+import (
+	"PD1/internal/client"
+)
+
+func main(){
+   client.Run() 
+}
--- a/Projs/PD2/cmd/gateway/gateway.go
+++ b/Projs/PD2/cmd/gateway/gateway.go
@ -0,0 +1,9 @@
+package main
+
+import (
+	"PD1/internal/gateway"
+)
+
+func main(){
+   gateway.Run() 
+}
--- a/Projs/PD2/cmd/server/server.go
+++ b/Projs/PD2/cmd/server/server.go
@ -0,0 +1,9 @@
+package main
+
+import (
+	"PD1/internal/server"
+)
+
+func main(){
+   server.Run() 
+}
--- a/Projs/PD2/go.mod
+++ b/Projs/PD2/go.mod
@ -0,0 +1,38 @@
+module PD1
+
+go 1.22.2
+
+require (
+	github.com/gin-gonic/gin v1.10.0
+	github.com/mattn/go-sqlite3 v1.14.22
+	golang.org/x/crypto v0.23.0
+	software.sslmate.com/src/go-pkcs12 v0.4.0
+)
+
+require (
+	github.com/bytedance/sonic v1.11.6 // indirect
+	github.com/bytedance/sonic/loader v0.1.1 // indirect
+	github.com/cloudwego/base64x v0.1.4 // indirect
+	github.com/cloudwego/iasm v0.2.0 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.3 // indirect
+	github.com/gin-contrib/sse v0.1.0 // indirect
+	github.com/go-playground/locales v0.14.1 // indirect
+	github.com/go-playground/universal-translator v0.18.1 // indirect
+	github.com/go-playground/validator/v10 v10.20.0 // indirect
+	github.com/goccy/go-json v0.10.2 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.7 // indirect
+	github.com/leodido/go-urn v1.4.0 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
+	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
+	github.com/ugorji/go/codec v1.2.12 // indirect
+	golang.org/x/arch v0.8.0 // indirect
+	golang.org/x/net v0.25.0 // indirect
+	golang.org/x/sys v0.20.0 // indirect
+	golang.org/x/text v0.15.0 // indirect
+	google.golang.org/protobuf v1.34.1 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
--- a/Projs/PD2/go.sum
+++ b/Projs/PD2/go.sum
@ -0,0 +1,93 @@
+github.com/bytedance/sonic v1.11.6 h1:oUp34TzMlL+OY1OUWxHqsdkgC/Zfc85zGqw9siXjrc0=
+github.com/bytedance/sonic v1.11.6/go.mod h1:LysEHSvpvDySVdC2f87zGWf6CIKJcAvqab1ZaiQtds4=
+github.com/bytedance/sonic/loader v0.1.1 h1:c+e5Pt1k/cy5wMveRDyk2X4B9hF4g7an8N3zCYjJFNM=
+github.com/bytedance/sonic/loader v0.1.1/go.mod h1:ncP89zfokxS5LZrJxl5z0UJcsk4M4yY2JpfqGeCtNLU=
+github.com/cloudwego/base64x v0.1.4 h1:jwCgWpFanWmN8xoIUHa2rtzmkd5J2plF/dnLS6Xd/0Y=
+github.com/cloudwego/base64x v0.1.4/go.mod h1:0zlkT4Wn5C6NdauXdJRhSKRlJvmclQ1hhJgA0rcu/8w=
+github.com/cloudwego/iasm v0.2.0 h1:1KNIy1I1H9hNNFEEH3DVnI4UujN+1zjpuk6gwHLTssg=
+github.com/cloudwego/iasm v0.2.0/go.mod h1:8rXZaNYT2n95jn+zTI1sDr+IgcD2GVs0nlbbQPiEFhY=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/gabriel-vasile/mimetype v1.4.3 h1:in2uUcidCuFcDKtdcBxlR0rJ1+fsokWf+uqxgUFjbI0=
+github.com/gabriel-vasile/mimetype v1.4.3/go.mod h1:d8uq/6HKRL6CGdk+aubisF/M5GcPfT7nKyLpA0lbSSk=
+github.com/gin-contrib/sse v0.1.0 h1:Y/yl/+YNO8GZSjAhjMsSuLt29uWRFHdHYUb5lYOV9qE=
+github.com/gin-contrib/sse v0.1.0/go.mod h1:RHrZQHXnP2xjPF+u1gW/2HnVO7nvIa9PG3Gm+fLHvGI=
+github.com/gin-gonic/gin v1.10.0 h1:nTuyha1TYqgedzytsKYqna+DfLos46nTv2ygFy86HFU=
+github.com/gin-gonic/gin v1.10.0/go.mod h1:4PMNQiOhvDRa013RKVbsiNwoyezlm2rm0uX/T7kzp5Y=
+github.com/go-playground/assert/v2 v2.2.0 h1:JvknZsQTYeFEAhQwI4qEt9cyV5ONwRHC+lYKSsYSR8s=
+github.com/go-playground/assert/v2 v2.2.0/go.mod h1:VDjEfimB/XKnb+ZQfWdccd7VUvScMdVu0Titje2rxJ4=
+github.com/go-playground/locales v0.14.1 h1:EWaQ/wswjilfKLTECiXz7Rh+3BjFhfDFKv/oXslEjJA=
+github.com/go-playground/locales v0.14.1/go.mod h1:hxrqLVvrK65+Rwrd5Fc6F2O76J/NuW9t0sjnWqG1slY=
+github.com/go-playground/universal-translator v0.18.1 h1:Bcnm0ZwsGyWbCzImXv+pAJnYK9S473LQFuzCbDbfSFY=
+github.com/go-playground/universal-translator v0.18.1/go.mod h1:xekY+UJKNuX9WP91TpwSH2VMlDf28Uj24BCp08ZFTUY=
+github.com/go-playground/validator/v10 v10.20.0 h1:K9ISHbSaI0lyB2eWMPJo+kOS/FBExVwjEviJTixqxL8=
+github.com/go-playground/validator/v10 v10.20.0/go.mod h1:dbuPbCMFw/DrkbEynArYaCwl3amGuJotoKCe95atGMM=
+github.com/goccy/go-json v0.10.2 h1:CrxCmQqYDkv1z7lO7Wbh2HN93uovUHgrECaO5ZrCXAU=
+github.com/goccy/go-json v0.10.2/go.mod h1:6MelG93GURQebXPDq3khkgXZkazVtN9CRI+MGFi0w8I=
+github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
+github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
+github.com/json-iterator/go v1.1.12 h1:PV8peI4a0ysnczrg+LtxykD8LfKY9ML6u2jnxaEnrnM=
+github.com/json-iterator/go v1.1.12/go.mod h1:e30LSqwooZae/UwlEbR2852Gd8hjQvJoHmT4TnhNGBo=
+github.com/klauspost/cpuid/v2 v2.0.9/go.mod h1:FInQzS24/EEf25PyTYn52gqo7WaD8xa0213Md/qVLRg=
+github.com/klauspost/cpuid/v2 v2.2.7 h1:ZWSB3igEs+d0qvnxR/ZBzXVmxkgt8DdzP6m9pfuVLDM=
+github.com/klauspost/cpuid/v2 v2.2.7/go.mod h1:Lcz8mBdAVJIBVzewtcLocK12l3Y+JytZYpaMropDUws=
+github.com/knz/go-libedit v1.10.1/go.mod h1:MZTVkCWyz0oBc7JOWP3wNAzd002ZbM/5hgShxwh4x8M=
+github.com/leodido/go-urn v1.4.0 h1:WT9HwE9SGECu3lg4d/dIA+jxlljEa1/ffXKmRjqdmIQ=
+github.com/leodido/go-urn v1.4.0/go.mod h1:bvxc+MVxLKB4z00jd1z+Dvzr47oO32F/QSNjSBOlFxI=
+github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
+github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
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--- a/Projs/PD2/internal/client/client.go
+++ b/Projs/PD2/internal/client/client.go
@ -0,0 +1,323 @@
+package client
+
+import (
+	"PD1/internal/protocol"
+	"PD1/internal/utils/cryptoUtils"
+	"PD1/internal/utils/networking"
+	"crypto/x509"
+	"errors"
+	"flag"
+	"log"
+	"os"
+	"sort"
+	"strconv"
+)
+
+func Run() {
+	var userFile string
+	flag.StringVar(&userFile, "user", "userdata.p12", "Specify user data file")
+	flag.Parse()
+
+	if flag.NArg() == 0 {
+		log.Fatalln("No command provided. Use 'help' for instructions.")
+	}
+	//Get user KeyStore
+	password := readStdin("Insert keystore passphrase")
+	clientKeyStore, err := cryptoUtils.LoadKeyStore(userFile, password)
+	if err != nil {
+		log.Fatalln(err)
+	}
+
+	command := flag.Arg(0)
+	switch command {
+	case "send":
+		if flag.NArg() != 3 {
+            printError("MSG SERVICE: command error!")
+			showHelp()
+			os.Exit(1)
+		}
+		uid := flag.Arg(1)
+		plainSubject := flag.Arg(2)
+		plainBody := readStdin("Enter message content (limited to 1000 bytes):")
+		err := sendCommand(clientKeyStore, plainSubject, plainBody, uid)
+		if err != nil {
+			log.Fatalln(err)
+		}
+
+	case "askqueue":
+		if flag.NArg() > 3 {
+            printError("MSG SERVICE: command error!")
+			showHelp()
+			os.Exit(1)
+		}
+		pageInput := flag.Arg(1)
+		page := 1
+		if pageInput != "" {
+			if val, err := strconv.Atoi(pageInput); err == nil {
+				page = max(1, val)
+			}
+		}
+		pageSizeInput := flag.Arg(2)
+		pageSize := 5
+		if pageSizeInput != "" {
+			if val, err := strconv.Atoi(pageSizeInput); err == nil {
+				pageSize = max(1, val)
+			}
+		}
+
+		err := askQueueCommand(clientKeyStore, page, pageSize)
+		if err != nil {
+			log.Fatalln(err)
+		}
+
+	case "getmsg":
+		if flag.NArg() < 2 {
+            printError("MSG SERVICE: command error!")
+			showHelp()
+			os.Exit(1)
+		}
+		numString := flag.Arg(1)
+		num, err := strconv.Atoi(numString)
+		if err != nil {
+			log.Fatalln(err)
+		}
+		err = getMsgCommand(clientKeyStore, num)
+		if err != nil {
+            printError(err.Error())
+		}
+
+	case "help":
+		showHelp()
+
+	default:
+        printError("MSG SERVICE: command error!")
+		showHelp()
+	}
+
+}
+
+func sendCommand(clientKeyStore cryptoUtils.KeyStore, plainSubject, plainBody, uid string) error {
+	//Turn content to bytes
+	plainSubjectBytes, err := Marshal(plainSubject)
+	if err != nil {
+		return err
+	}
+	plainBodyBytes, err := Marshal(plainBody)
+	if err != nil {
+		return err
+	}
+
+	cl, err := networking.NewClient[protocol.Packet](&clientKeyStore)
+	if err != nil {
+		return err
+	}
+	defer cl.Connection.Conn.Close()
+
+	receiverCert, err := getUserCert(cl, clientKeyStore, uid)
+	if err != nil {
+		return err
+	}
+	subject, err := clientKeyStore.EncryptMessageContent(receiverCert, plainSubjectBytes)
+	if err != nil {
+		return err
+	}
+	body, err := clientKeyStore.EncryptMessageContent(receiverCert, plainBodyBytes)
+	if err != nil {
+		return err
+	}
+	sendMsgPacket := protocol.NewSendMsgPacket(uid, subject, body)
+	if err := cl.Connection.Send(sendMsgPacket); err != nil {
+		return err
+	}
+	answerSendMsg, err := cl.Connection.Receive()
+	if err != nil {
+		return err
+	}
+	if answerSendMsg.Flag == protocol.FlagReportError {
+		reportError, err := protocol.UnmarshalReportError(answerSendMsg.Body)
+		if err != nil {
+			return err
+		}
+		return errors.New(reportError.ErrorMessage)
+	}
+	return nil
+
+}
+
+func getMsgCommand(clientKeyStore cryptoUtils.KeyStore, num int) error {
+	cl, err := networking.NewClient[protocol.Packet](&clientKeyStore)
+	if err != nil {
+		return err
+	}
+	defer cl.Connection.Conn.Close()
+	packet := protocol.NewGetMsgPacket(num)
+	if err := cl.Connection.Send(packet); err != nil {
+		return err
+	}
+
+	receivedMsgPacket, err := cl.Connection.Receive()
+	if err != nil {
+		return err
+	}
+	if receivedMsgPacket.Flag == protocol.FlagReportError {
+		reportError, err := protocol.UnmarshalReportError(receivedMsgPacket.Body)
+		if err != nil {
+			return err
+		}
+		return errors.New(reportError.ErrorMessage)
+	}
+	answerGetMsg, err := protocol.UnmarshalAnswerGetMsg(receivedMsgPacket.Body)
+	if err != nil {
+		return err
+	}
+	senderCert, err := getUserCert(cl, clientKeyStore, answerGetMsg.FromUID)
+	if err != nil {
+		return err
+	}
+	decSubjectBytes, err := clientKeyStore.DecryptMessageContent(senderCert, answerGetMsg.Subject)
+	if err != nil {
+		return err
+	}
+	decBodyBytes, err := clientKeyStore.DecryptMessageContent(senderCert, answerGetMsg.Body)
+	if err != nil {
+		return err
+	}
+	subject, err := Unmarshal(decSubjectBytes)
+	if err != nil {
+		return err
+	}
+	body, err := Unmarshal(decBodyBytes)
+	if err != nil {
+		return err
+	}
+	message := newClientMessage(answerGetMsg.FromUID, answerGetMsg.ToUID, subject, body, answerGetMsg.Timestamp)
+	showMessage(message)
+	return nil
+}
+
+func getUserCert(cl networking.Client[protocol.Packet], keyStore cryptoUtils.KeyStore, uid string) (*x509.Certificate, error) {
+	getUserCertPacket := protocol.NewGetUserCertPacket(uid)
+	if err := cl.Connection.Send(getUserCertPacket); err != nil {
+		return nil, err
+	}
+	var answerGetUserCertPacket *protocol.Packet
+	answerGetUserCertPacket, err := cl.Connection.Receive()
+	if err != nil {
+		return nil, err
+	}
+	if answerGetUserCertPacket.Flag == protocol.FlagReportError {
+		reportError, err := protocol.UnmarshalReportError(answerGetUserCertPacket.Body)
+		if err != nil {
+			return nil, err
+		}
+		return nil, errors.New(reportError.ErrorMessage)
+	}
+	answerGetUserCert, err := protocol.UnmarshalAnswerGetUserCert(answerGetUserCertPacket.Body)
+	if err != nil {
+		return nil, err
+	}
+	userCert, err := x509.ParseCertificate(answerGetUserCert.Certificate)
+	if err != nil {
+		return nil, err
+	}
+	if err := keyStore.CheckCert(userCert, uid); err != nil {
+		return nil, err
+	}
+	return userCert, nil
+}
+
+func getManyMessagesInfo(cl networking.Client[protocol.Packet], keyStore cryptoUtils.KeyStore) (protocol.AnswerGetUnreadMsgsInfo, map[string]*x509.Certificate, error) {
+	answerGetUnreadMsgsInfoPacket, err := cl.Connection.Receive()
+	if err != nil {
+		return protocol.NewAnswerGetUnreadMsgsInfo(0, 0, nil), nil, err
+	}
+	if answerGetUnreadMsgsInfoPacket.Flag == protocol.FlagReportError {
+		reportError, err := protocol.UnmarshalReportError(answerGetUnreadMsgsInfoPacket.Body)
+		if err != nil {
+			return protocol.AnswerGetUnreadMsgsInfo{}, nil, err
+		}
+		return protocol.NewAnswerGetUnreadMsgsInfo(0, 0, nil), nil, errors.New(reportError.ErrorMessage)
+	}
+	answerGetUnreadMsgsInfo, err := protocol.UnmarshalAnswerGetUnreadMsgsInfo(answerGetUnreadMsgsInfoPacket.Body)
+	if err != nil {
+		return protocol.AnswerGetUnreadMsgsInfo{}, nil, err
+	}
+
+	//Create Set of needed certificates
+	senderSet := map[string]bool{}
+	for _, messageInfo := range answerGetUnreadMsgsInfo.MessagesInfo {
+		senderSet[messageInfo.FromUID] = true
+	}
+	certificatesMap := map[string]*x509.Certificate{}
+	//Get senders' certificates
+	for senderUID := range senderSet {
+		senderCert, err := getUserCert(cl, keyStore, senderUID)
+		if err == nil {
+			certificatesMap[senderUID] = senderCert
+		}
+	}
+	return answerGetUnreadMsgsInfo, certificatesMap, nil
+}
+
+func askQueueCommand(clientKeyStore cryptoUtils.KeyStore, page int, pageSize int) error {
+	cl, err := networking.NewClient[protocol.Packet](&clientKeyStore)
+	if err != nil {
+		return err
+	}
+	defer cl.Connection.Conn.Close()
+	return askQueueRec(cl, clientKeyStore, page, pageSize)
+}
+
+func askQueueRec(cl networking.Client[protocol.Packet], clientKeyStore cryptoUtils.KeyStore, page int, pageSize int) error {
+
+	requestUnreadMsgsQueuePacket := protocol.NewGetUnreadMsgsInfoPacket(page, pageSize)
+	if err := cl.Connection.Send(requestUnreadMsgsQueuePacket); err != nil {
+		return err
+	}
+	unreadMsgsInfo, certificates, err := getManyMessagesInfo(cl, clientKeyStore)
+	if err != nil {
+		return err
+	}
+	var clientMessages []ClientMessageInfo
+	for _, message := range unreadMsgsInfo.MessagesInfo {
+		var clientMessageInfo ClientMessageInfo
+		senderCert, ok := certificates[message.FromUID]
+		if !ok {
+			clientMessageInfo = newClientMessageInfo(message.Num,
+				message.FromUID,
+				"",
+				message.Timestamp,
+				errors.New("certificate needed to decrypt not received"))
+			clientMessages = append(clientMessages, clientMessageInfo)
+			continue
+		}
+		decryptedSubjectBytes, err := clientKeyStore.DecryptMessageContent(senderCert, message.Subject)
+		if err != nil {
+			clientMessageInfo = newClientMessageInfo(message.Num, message.FromUID, "", message.Timestamp, err)
+			clientMessages = append(clientMessages, clientMessageInfo)
+			continue
+		}
+		subject, err := Unmarshal(decryptedSubjectBytes)
+		if err != nil {
+			clientMessageInfo = newClientMessageInfo(message.Num, message.FromUID, "", message.Timestamp, err)
+			clientMessages = append(clientMessages, clientMessageInfo)
+			continue
+		}
+		clientMessageInfo = newClientMessageInfo(message.Num, message.FromUID, subject, message.Timestamp, nil)
+		clientMessages = append(clientMessages, clientMessageInfo)
+	}
+	//Sort the messages
+	sort.Slice(clientMessages, func(i, j int) bool {
+		return clientMessages[i].Num > clientMessages[j].Num
+	})
+
+	action := showMessagesInfo(unreadMsgsInfo.Page, unreadMsgsInfo.NumPages, clientMessages)
+	switch action {
+	case -1:
+		return askQueueRec(cl, clientKeyStore, max(1, unreadMsgsInfo.Page-1), pageSize)
+	case 1:
+		return askQueueRec(cl, clientKeyStore, max(1, unreadMsgsInfo.Page+1), pageSize)
+	default:
+		return nil
+	}
+}
--- a/Projs/PD2/internal/client/datastore.go
+++ b/Projs/PD2/internal/client/datastore.go
@ -0,0 +1,47 @@
+package client
+
+import (
+	"encoding/json"
+	"time"
+)
+
+type ClientMessage struct {
+	FromUID   string
+	ToUID     string
+	Subject   string
+	Body      string
+	Timestamp time.Time
+}
+
+type ClientMessageInfo struct {
+	Num          int
+	FromUID      string
+	Timestamp    time.Time
+	Subject      string
+	decryptError error
+}
+
+func newClientMessage(fromUID string, toUID string, subject string, body string, timestamp time.Time) ClientMessage {
+	return ClientMessage{FromUID: fromUID, ToUID: toUID, Subject: subject, Body: body, Timestamp: timestamp}
+}
+
+func newClientMessageInfo(num int, fromUID string, subject string, timestamp time.Time, err error) ClientMessageInfo {
+	return ClientMessageInfo{Num: num, FromUID: fromUID, Subject: subject, Timestamp: timestamp, decryptError: err}
+}
+
+func Marshal(data any) ([]byte, error) {
+	subject, err := json.Marshal(data)
+	if err != nil {
+		return nil, err
+	}
+	return subject, nil
+}
+
+func Unmarshal(data []byte) (string, error) {
+	var c string
+	err := json.Unmarshal(data, &c)
+	if err != nil {
+		return "", err
+	}
+	return c, nil
+}
--- a/Projs/PD2/internal/client/interface.go
+++ b/Projs/PD2/internal/client/interface.go
@ -0,0 +1,92 @@
+package client
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+)
+
+func readStdin(message string) string {
+	fmt.Println(message)
+	scanner := bufio.NewScanner(os.Stdin)
+	scanner.Scan()
+	return scanner.Text()
+}
+
+func printError(err string) {
+	fmt.Fprintln(os.Stderr, err)
+}
+
+func showHelp() {
+	fmt.Println("Comandos da aplicação cliente:")
+	fmt.Println("-user <FNAME>: Especifica o ficheiro com dados do utilizador. Por omissão, será assumido que esse ficheiro é userdata.p12.")
+	fmt.Println("send <UID> <SUBJECT>: Envia uma mensagem com assunto <SUBJECT> destinada ao utilizador com identificador <UID>. O conteúdo da mensagem será lido do stdin, e o tamanho deve ser limitado a 1000 bytes.")
+	fmt.Println("askqueue: Solicita ao servidor que lhe envie a lista de mensagens não lidas da queue do utilizador.")
+	fmt.Println("getmsg <NUM>: Solicita ao servidor o envio da mensagem da sua queue com número <NUM>.")
+	fmt.Println("help: Imprime instruções de uso do programa.")
+}
+
+func showMessagesInfo(page int, numPages int, messages []ClientMessageInfo) int {
+	if messages == nil {
+		fmt.Println("No unread messages in the queue")
+		return 0
+	}
+	for _, message := range messages {
+		if message.decryptError != nil {
+			fmt.Printf("ERROR: %v:%v:%v:", message.Num, message.FromUID, message.Timestamp)
+			fmt.Println(message.decryptError)
+		} else {
+			fmt.Printf("%v:%v:%v:%v\n", message.Num, message.FromUID, message.Timestamp, message.Subject)
+		}
+	}
+	fmt.Printf("Page %v/%v\n", page, numPages)
+	return messagesInfoPageNavigation(page, numPages)
+}
+
+func messagesInfoPageNavigation(page int, numPages int) int {
+	var action string
+
+	switch page {
+	case 1:
+		if page == numPages {
+            return 0
+		} else {
+			action = readStdin("Actions: quit/next")
+		}
+	case numPages:
+		action = readStdin("Actions: prev/quit")
+	default:
+		action = readStdin("prev/quit/next")
+	}
+
+	switch strings.ToLower(action) {
+	case "prev":
+		if page == 1 {
+			fmt.Println("Unavailable action: Already in first page")
+			messagesInfoPageNavigation(page, numPages)
+		} else {
+			return -1
+		}
+	case "quit":
+		return 0
+	case "next":
+		if page == numPages {
+			fmt.Println("Unavailable action: Already in last page")
+			messagesInfoPageNavigation(page, numPages)
+		} else {
+			return 1
+		}
+	default:
+		fmt.Println("Unknown action")
+		messagesInfoPageNavigation(page, numPages)
+	}
+	return 0
+}
+
+func showMessage(message ClientMessage) {
+	fmt.Printf("From: %s\n", message.FromUID)
+	fmt.Printf("To: %s\n", message.ToUID)
+	fmt.Printf("Subject: %s\n", message.Subject)
+	fmt.Printf("Body: %s\n", message.Body)
+}
--- a/Projs/PD2/internal/gateway/gateway.go
+++ b/Projs/PD2/internal/gateway/gateway.go
@ -0,0 +1,5 @@
+package gateway
+
+func Run(){
+
+}
--- a/Projs/PD2/internal/protocol/protocol.go
+++ b/Projs/PD2/internal/protocol/protocol.go
@ -0,0 +1,119 @@
+package protocol
+
+import (
+	"time"
+)
+
+type Body interface{}
+
+type (
+	GetUserCert struct {
+		UID string `json:"uid"`
+	}
+
+	GetUnreadMsgsInfo struct {
+		Page     int `json:"page"`
+		PageSize int `json:"pageSize"`
+	}
+
+	GetMsg struct {
+		Num int `json:"num"`
+	}
+
+	SendMsg struct {
+		ToUID   string `json:"to_uid"`
+		Subject []byte `json:"subject"`
+		Body    []byte `json:"body"`
+	}
+
+	AnswerGetUserCert struct {
+		UID         string `json:"uid"`
+		Certificate []byte `json:"certificate"`
+	}
+
+	AnswerGetUnreadMsgsInfo struct {
+		Page         int       `json:"page"`
+		NumPages     int       `json:"num_pages"`
+		MessagesInfo []MsgInfo `json:"messages_info"`
+	}
+
+	MsgInfo struct {
+		Num       int       `json:"num"`
+		FromUID   string    `json:"from_uid"`
+		Subject   []byte    `json:"subject"`
+		Timestamp time.Time `json:"timestamp"`
+	}
+
+	AnswerGetMsg struct {
+		FromUID   string    `json:"from_uid"`
+		ToUID     string    `json:"to_uid"`
+		Subject   []byte    `json:"subject"`
+		Body      []byte    `json:"body"`
+		Timestamp time.Time `json:"timestamp"`
+	}
+
+	ReportError struct {
+		ErrorMessage string `json:"error"`
+	}
+)
+
+func NewGetUserCert(UID string) GetUserCert {
+	return GetUserCert{
+		UID: UID,
+	}
+}
+
+func NewGetUnreadMsgsInfo(page int, pageSize int) GetUnreadMsgsInfo {
+	return GetUnreadMsgsInfo{
+		Page:     page,
+		PageSize: pageSize}
+}
+
+func NewGetMsg(num int) GetMsg {
+	return GetMsg{
+		Num: num,
+	}
+}
+
+func NewSendMsg(toUID string, subject []byte, body []byte) SendMsg {
+	return SendMsg{
+		ToUID:   toUID,
+		Subject: subject,
+		Body:    body,
+	}
+}
+
+func NewAnswerGetUserCert(uid string, certificate []byte) AnswerGetUserCert {
+	return AnswerGetUserCert{
+		UID:         uid,
+		Certificate: certificate,
+	}
+}
+
+func NewAnswerGetUnreadMsgsInfo(page int, numPages int, messagesInfo []MsgInfo) AnswerGetUnreadMsgsInfo {
+	return AnswerGetUnreadMsgsInfo{Page: page, NumPages: numPages, MessagesInfo: messagesInfo}
+}
+func NewMsgInfo(num int, fromUID string, subject []byte, timestamp time.Time) MsgInfo {
+	return MsgInfo{
+		Num:       num,
+		FromUID:   fromUID,
+		Subject:   subject,
+		Timestamp: timestamp,
+	}
+}
+
+func NewAnswerGetMsg(fromUID, toUID string, subject []byte, body []byte, timestamp time.Time, last bool) AnswerGetMsg {
+	return AnswerGetMsg{
+		FromUID:   fromUID,
+		ToUID:     toUID,
+		Subject:   subject,
+		Body:      body,
+		Timestamp: timestamp,
+	}
+}
+
+func NewReportError(errorMessage string) ReportError {
+	return ReportError{
+		ErrorMessage: errorMessage,
+	}
+}
--- a/Projs/PD2/internal/server/datastore.go
+++ b/Projs/PD2/internal/server/datastore.go
@ -0,0 +1,245 @@
+package server
+
+import (
+	"PD1/internal/protocol"
+	"crypto/x509"
+	"database/sql"
+	"errors"
+	"fmt"
+	"log"
+	"time"
+
+	_ "github.com/mattn/go-sqlite3"
+)
+
+type DataStore struct {
+	db *sql.DB
+}
+
+func OpenDB() (DataStore, error) {
+	db, err := sql.Open("sqlite3", "server.db")
+	if err != nil {
+		return DataStore{}, err
+	}
+	ds := DataStore{db: db}
+	err = ds.CreateTables()
+	if err != nil {
+		return DataStore{}, err
+	}
+	return ds, nil
+}
+
+func (ds DataStore) CreateTables() error {
+	// Create users table
+	_, err := ds.db.Exec(`CREATE TABLE IF NOT EXISTS users (
+        UID TEXT PRIMARY KEY,
+        userCert BLOB
+    )`)
+	if err != nil {
+		return err
+	}
+
+	// Create messages table
+	_, err = ds.db.Exec(`CREATE TABLE IF NOT EXISTS messages (
+        fromUID TEXT,
+        toUID TEXT,
+        timestamp TIMESTAMP,
+        queue_position INT DEFAULT 0,
+        subject BLOB,
+        body BLOB,
+        status INT CHECK (status IN (0,1)),
+        PRIMARY KEY (toUID, fromUID, timestamp),
+        FOREIGN KEY(fromUID) REFERENCES users(UID),
+        FOREIGN KEY(toUID) REFERENCES users(UID)
+    )`)
+	if err != nil {
+		return err
+	}
+
+	// Define a trigger to automatically assign numbers for each message of each user starting from 1
+	_, err = ds.db.Exec(`
+        CREATE TRIGGER IF NOT EXISTS assign_queue_position
+        AFTER INSERT ON messages
+        FOR EACH ROW
+        BEGIN
+            UPDATE messages
+            SET queue_position = (
+                SELECT COUNT(*)
+                FROM messages
+                WHERE toUID = NEW.toUID
+            )
+            WHERE toUID = NEW.toUID AND rowid = NEW.rowid;
+        END;
+    `)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (ds DataStore) GetMessage(toUID string, position int) (*protocol.AnswerGetMsg, error) {
+
+	var serverMessage protocol.AnswerGetMsg
+	query := `
+        SELECT fromUID, toUID, subject, body, timestamp
+        FROM messages
+        WHERE toUID = ? AND queue_position = ?
+    `
+	// Execute the query
+	row := ds.db.QueryRow(query, toUID, position)
+	err := row.Scan(&serverMessage.FromUID, &serverMessage.ToUID, &serverMessage.Subject, &serverMessage.Body, &serverMessage.Timestamp)
+	if err == sql.ErrNoRows {
+		log.Printf("No message with NUM %v for UID %v\n", position, toUID)
+		errorMessage := fmt.Sprintln("MSG SERVICE: unknown message!")
+		error := errors.New(errorMessage)
+		return nil, error
+	}
+
+	answer := protocol.NewAnswerGetMsg(serverMessage.FromUID, serverMessage.ToUID, serverMessage.Subject, serverMessage.Body, serverMessage.Timestamp, true)
+	return &answer, nil
+
+}
+
+func (ds DataStore) MarkMessageInQueueAsRead(toUID string, position int) {
+	query := `
+        UPDATE messages
+            SET status = 1
+            WHERE (fromUID,toUID,timestamp) = (
+                SELECT fromUID,toUID,timestamp
+                FROM messages
+                WHERE toUID = ? AND queue_position = ?
+            )
+    `
+
+	// Execute the SQL statement
+	_, err := ds.db.Exec(query, toUID, position)
+	if err != nil {
+		log.Printf("Error marking the message in position %v from UID %v as read: %v", position, toUID, err)
+	}
+}
+
+func (ds DataStore) GetUnreadMsgsInfo(toUID string, page int, pageSize int) (protocol.AnswerGetUnreadMsgsInfo, error) {
+
+	// Retrieve the total count of unread messages
+	var totalCount int
+	err := ds.db.QueryRow("SELECT COUNT(*) FROM messages WHERE toUID = ? AND status = 0", toUID).Scan(&totalCount)
+	if err == sql.ErrNoRows {
+		return protocol.NewAnswerGetUnreadMsgsInfo(0, 0, []protocol.MsgInfo{}), nil
+	}
+
+	// Query to retrieve all messages from the user's queue
+	query := `
+        SELECT 
+            fromUID,
+            toUID,
+            timestamp,
+            queue_position,
+            subject,
+            status
+        FROM messages
+        WHERE 
+            toUID = ? AND status = 0
+        ORDER BY 
+            queue_position DESC
+        LIMIT ? OFFSET ?;
+    `
+
+	// Execute the query
+	rows, err := ds.db.Query(query, toUID, pageSize, (page-1)*pageSize)
+	if err != nil {
+		log.Printf("Error getting unread messages for UID %v: %v", toUID, err)
+	}
+	defer rows.Close()
+
+	messageInfoPackets := []protocol.MsgInfo{}
+	for rows.Next() {
+		var fromUID string
+		var subject []byte
+		var timestamp time.Time
+		var queuePosition, status int
+		if err := rows.Scan(&fromUID, &toUID, &timestamp, &queuePosition, &subject, &status); err != nil {
+			return protocol.AnswerGetUnreadMsgsInfo{}, err
+		}
+		answerGetUnreadMsgsInfo := protocol.NewMsgInfo(queuePosition, fromUID, subject, timestamp)
+		messageInfoPackets = append(messageInfoPackets, answerGetUnreadMsgsInfo)
+	}
+	if err := rows.Err(); err != nil {
+		log.Printf("Error when getting messages for UID %v: %v", toUID, err)
+		return protocol.AnswerGetUnreadMsgsInfo{}, err
+	}
+	numberOfPages := (totalCount + pageSize - 1) / pageSize
+	currentPage := min(numberOfPages, page)
+	return protocol.NewAnswerGetUnreadMsgsInfo(currentPage, numberOfPages, messageInfoPackets), nil
+}
+
+func (ds DataStore) AddMessageToQueue(fromUID string, message protocol.SendMsg) error {
+	query := `
+        INSERT INTO messages (fromUID, toUID, subject, body, timestamp, status)
+        VALUES (?, ?, ?, ?, ?, 0)
+    `
+
+	// Execute the SQL statement
+	currentTime := time.Now()
+	_, err := ds.db.Exec(query, fromUID, message.ToUID, message.Subject, message.Body, currentTime)
+	if err != nil {
+		log.Printf("Error adding message to UID %v: %v", fromUID, err)
+		return err
+	}
+	return nil
+}
+
+func (ds DataStore) GetUserCertificate(uid string) (protocol.AnswerGetUserCert,error) {
+	query := `
+        SELECT userCert
+        FROM users
+        WHERE UID = ?
+    `
+
+	// Execute the SQL query
+	var userCertBytes []byte
+	err := ds.db.QueryRow(query, uid).Scan(&userCertBytes)
+	if err == sql.ErrNoRows {
+		errorMessage := fmt.Sprintf("No certificate for UID %v found in the database", uid)
+		log.Println(errorMessage)
+		return protocol.AnswerGetUserCert{},errors.New(errorMessage)
+	}
+	return protocol.NewAnswerGetUserCert(uid, userCertBytes),nil
+}
+
+func (ds DataStore) userExists(uid string) bool {
+	// Prepare the SQL statement for checking if a user exists
+	query := `
+        SELECT COUNT(*)
+        FROM users
+        WHERE UID = ?
+    `
+
+	var count int
+	// Execute the SQL query
+	err := ds.db.QueryRow(query, uid).Scan(&count)
+	if err != nil || count == 0 {
+		log.Printf("user with UID %v does not exist\n", uid)
+		return false
+	}
+	return true
+}
+
+func (ds DataStore) storeUserCertIfNotExists(uid string, cert x509.Certificate) error {
+	// Check if the user already exists
+	if ds.userExists(uid) {
+		return nil
+	}
+
+	// Insert the user certificate
+	insertQuery := `
+        INSERT INTO users (UID, userCert)
+        VALUES (?, ?)
+    `
+	_, err := ds.db.Exec(insertQuery, uid, cert.Raw)
+	if err != nil {
+		return fmt.Errorf("error storing user certificate for UID %s: %v", uid, err)
+	}
+	log.Printf("User certificate for UID %s stored successfully.\n", uid)
+	return nil
+}
--- a/Projs/PD2/internal/server/interface.go
+++ b/Projs/PD2/internal/server/interface.go
@ -0,0 +1,14 @@
+package server
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+)
+
+func readStdin(message string) string {
+	fmt.Println(message)
+	scanner := bufio.NewScanner(os.Stdin)
+	scanner.Scan()
+	return scanner.Text()
+}
--- a/Projs/PD2/internal/server/server.go
+++ b/Projs/PD2/internal/server/server.go
@ -0,0 +1,151 @@
+package server
+
+import (
+	"PD1/internal/protocol"
+	"PD1/internal/utils/cryptoUtils"
+	"log"
+	"net/http"
+	"strconv"
+
+	"github.com/gin-gonic/gin"
+)
+
+//func clientHandler(connection networking.Connection[protocol.Packet], dataStore DataStore) {
+//	defer connection.Conn.Close()
+//
+//	//Get certificate sent by user
+//	clientCert := connection.GetPeerCertificate()
+//	//Get the OID values
+//	oidMap := cryptoUtils.ExtractAllOIDValues(clientCert)
+//	//Check if certificate usage is MSG SERVICE
+//	usage := oidMap["2.5.4.11"]
+//	if usage == "" {
+//		log.Fatalln("User certificate does not have the correct usage")
+//	}
+//	//Get the UID of this user
+//	UID := oidMap["2.5.4.65"]
+//	if UID == "" {
+//		log.Fatalln("User certificate does not specify it's PSEUDONYM")
+//	}
+//	err := dataStore.storeUserCertIfNotExists(UID, *clientCert)
+//	if err != nil {
+//		log.Fatalln(err)
+//	}
+//}
+
+func HandleGetUserCert(c *gin.Context, dataStore DataStore) {
+	user := c.Param("user")
+	userCertPacket, err := dataStore.GetUserCertificate(user)
+	if err != nil {
+		c.JSON(http.StatusNotFound, gin.H{"error": err.Error()})
+	} else {
+		c.JSON(http.StatusOK, userCertPacket)
+	}
+}
+
+func HandleGetUnreadMsgsInfo(c *gin.Context, dataStore DataStore) {
+	user := c.Param("user")
+
+	var getUnreadMsgsInfo protocol.GetUnreadMsgsInfo
+	if err := c.BindJSON(getUnreadMsgsInfo); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	if getUnreadMsgsInfo.Page <= 0 || getUnreadMsgsInfo.PageSize <= 0 {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Page and PageSize need to be >= 1"})
+		return
+	}
+	unreadMsgsInfo, err := dataStore.GetUnreadMsgsInfo(user, getUnreadMsgsInfo.Page, getUnreadMsgsInfo.PageSize)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, unreadMsgsInfo)
+}
+
+func HandleSendMessage(c *gin.Context, dataStore DataStore) {
+	sender := c.Param("user")
+
+	var message protocol.SendMsg
+	if err := c.BindJSON(message); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	if message.ToUID == sender {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Message sender and receiver cannot be the same user"})
+		return
+	}
+	if !dataStore.userExists(message.ToUID) {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Message receiver does not exist"})
+		return
+	}
+	err := dataStore.AddMessageToQueue(sender, message)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, nil)
+}
+
+func HandleGetMessage(c *gin.Context, dataStore DataStore) {
+	user := c.Param("user")
+	numStr := c.Param("num")
+	num, err := strconv.Atoi(numStr)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+	}
+
+	message, reportError := dataStore.GetMessage(user, num)
+	if reportError != nil {
+		c.JSON(http.StatusNotFound, gin.H{"error": err.Error()})
+	}
+	dataStore.MarkMessageInQueueAsRead(user, num)
+	c.JSON(http.StatusOK, message)
+}
+
+func Run() {
+	//Open connection to DB
+	dataStore, err := OpenDB()
+	if err != nil {
+		log.Fatalln(err)
+	}
+	defer dataStore.db.Close()
+
+	//Read server keystore
+	keystorePassphrase := readStdin("Insert keystore passphrase")
+	serverKeyStore, err := cryptoUtils.LoadKeyStore("certs/server/server.p12", keystorePassphrase)
+	if err != nil {
+		log.Fatalln(err)
+	}
+
+	r := gin.Default()
+
+	r.GET("/message/:user/:num", func(c *gin.Context) {
+		HandleGetMessage(c, dataStore)
+	})
+
+	r.GET("/queue/:user", func(c *gin.Context) {
+		HandleGetUnreadMsgsInfo(c, dataStore)
+	})
+
+	r.GET("/cert/:user", func(c *gin.Context) {
+		HandleGetUserCert(c, dataStore)
+	})
+
+	r.POST("/message/:user", func(c *gin.Context) {
+		HandleSendMessage(c, dataStore)
+	})
+
+	server := http.Server{
+		Addr:      "0.0.0.0:8080",
+		Handler:   r,
+		TLSConfig: serverKeyStore.GetTLSConfig(),
+	}
+
+	err = server.ListenAndServeTLS("", "")
+    if err!=nil {
+        log.Fatal(err.Error())
+    }
+}
--- a/Projs/PD2/internal/utils/cryptoUtils/cryptoUtils.go
+++ b/Projs/PD2/internal/utils/cryptoUtils/cryptoUtils.go
@ -0,0 +1,283 @@
+package cryptoUtils
+
+import (
+	"crypto"
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/sha256"
+	"crypto/tls"
+	"crypto/x509"
+	"encoding/binary"
+	"errors"
+	"time"
+
+	"log"
+	"os"
+
+	"golang.org/x/crypto/chacha20poly1305"
+	"software.sslmate.com/src/go-pkcs12"
+)
+
+type KeyStore struct {
+	cert        *x509.Certificate
+	caCertChain []*x509.Certificate
+	privKey     *rsa.PrivateKey
+}
+
+func (k KeyStore) GetCert() *x509.Certificate {
+	return k.cert
+}
+
+func (k KeyStore) GetCACertChain() []*x509.Certificate {
+	return k.caCertChain
+}
+
+func (k KeyStore) GetPrivKey() *rsa.PrivateKey {
+	return k.privKey
+}
+
+func ExtractAllOIDValues(cert *x509.Certificate) map[string]string {
+	oidValueMap := make(map[string]string)
+	for _, name := range cert.Subject.Names {
+		oid := name.Type.String()
+		value := name.Value.(string)
+		oidValueMap[oid] = value
+	}
+	return oidValueMap
+}
+
+func LoadKeyStore(keyStorePath string, password string) (KeyStore, error) {
+
+	var privKey *rsa.PrivateKey
+
+	keystoreBytes, err := os.ReadFile(keyStorePath)
+	if err != nil {
+		return KeyStore{}, err
+	}
+
+	privKeyInterface, cert, caCerts, err := pkcs12.DecodeChain(keystoreBytes, password)
+	if err != nil {
+		return KeyStore{}, err
+	}
+	privKey, ok := privKeyInterface.(*rsa.PrivateKey)
+	if !ok {
+		return KeyStore{}, err
+	}
+
+	if err := privKey.Validate(); err != nil {
+		return KeyStore{}, err
+	}
+	return KeyStore{cert: cert, caCertChain: caCerts, privKey: privKey}, err
+}
+
+// Check if the cert is signed by the CA and is for the correct user
+func (k KeyStore) CheckCert(cert *x509.Certificate, uid string) error {
+	caCertPool := x509.NewCertPool()
+	for _, caCert := range k.caCertChain {
+		caCertPool.AddCert(caCert)
+	}
+	opts := x509.VerifyOptions{
+		Roots: caCertPool,
+	}
+	// Check if the certificate is signed by the specified CA
+	_, err := cert.Verify(opts)
+	if err != nil {
+		log.Println("Certificate not signed by a trusted CA")
+		return err
+	}
+
+	if cert.NotAfter.Before(time.Now()) {
+		return errors.New("certificate has expired")
+	}
+	if cert.NotBefore.After(time.Now()) {
+		return errors.New("certificate is not valid yet")
+	}
+
+	//Check if the pseudonym field is set to UID
+	oidMap := ExtractAllOIDValues(cert)
+	if oidMap["2.5.4.65"] != uid {
+		log.Println("Certificate does not belong to the message's receiver")
+		return err
+	}
+	return nil
+}
+
+func (k *KeyStore) GetTLSConfig() *tls.Config {
+
+	certificate := tls.Certificate{Certificate: [][]byte{k.cert.Raw}, PrivateKey: k.privKey, Leaf: k.cert}
+
+	//Add the CA certificate chain to a CertPool
+	caCertPool := x509.NewCertPool()
+	for _, caCert := range k.caCertChain {
+		caCertPool.AddCert(caCert)
+	}
+	config := &tls.Config{
+		Certificates: []tls.Certificate{certificate},
+	}
+	return config
+}
+
+func (k *KeyStore) GetServerTLSConfig() *tls.Config {
+	tlsConfig := k.GetTLSConfig()
+
+	//Add the CA certificate chain to a CertPool
+	caCertPool := x509.NewCertPool()
+	for _, caCert := range k.caCertChain {
+		caCertPool.AddCert(caCert)
+	}
+	tlsConfig.ClientCAs = caCertPool
+	tlsConfig.ClientAuth = tls.RequireAnyClientCert
+	tlsConfig.VerifyPeerCertificate = func(rawCerts [][]byte, _ [][]*x509.Certificate) error {
+		// Verify the peer's certificate
+		opts := x509.VerifyOptions{
+			Roots: caCertPool,
+		}
+		for _, certBytes := range rawCerts {
+			cert, err := x509.ParseCertificate(certBytes)
+			if err != nil {
+				return err
+			}
+
+			if cert.NotAfter.Before(time.Now()) {
+				return errors.New("certificate has expired")
+			}
+			if cert.NotBefore.After(time.Now()) {
+				return errors.New("certificate is not valid yet")
+			}
+
+			// Check if the certificate is signed by the specified CA
+			_, err = cert.Verify(opts)
+			if err != nil {
+				return errors.New("certificate not signed by trusted CA")
+			}
+		}
+		return nil
+	}
+	return tlsConfig
+}
+
+func (k *KeyStore) GetClientTLSConfig() *tls.Config {
+	tlsConfig := k.GetTLSConfig()
+
+	//Add the CA certificate chain to a CertPool
+	caCertPool := x509.NewCertPool()
+	for _, caCert := range k.caCertChain {
+		caCertPool.AddCert(caCert)
+	}
+	tlsConfig.RootCAs = caCertPool
+	tlsConfig.InsecureSkipVerify = true
+	tlsConfig.VerifyPeerCertificate = func(rawCerts [][]byte, _ [][]*x509.Certificate) error {
+		// Verify the peer's certificate
+		opts := x509.VerifyOptions{
+			Roots: caCertPool,
+		}
+		for _, certBytes := range rawCerts {
+			cert, err := x509.ParseCertificate(certBytes)
+			if err != nil {
+				return err
+			}
+
+			if cert.NotAfter.Before(time.Now()) {
+				return errors.New("certificate has expired")
+			}
+			if cert.NotBefore.After(time.Now()) {
+				return errors.New("certificate is not valid yet")
+			}
+			oidMap := ExtractAllOIDValues(cert)
+
+			// Check if the certificate is signed by the specified CA
+			_, err = cert.Verify(opts)
+			if err != nil {
+				return errors.New("certificate not signed by trusted CA")
+			}
+
+			//Check if the pseudonym field is set to "SERVER"
+			if oidMap["2.5.4.65"] != "SERVER" {
+				return errors.New("peer isn't the server")
+			}
+		}
+		return nil
+	}
+	return tlsConfig
+}
+
+func (k KeyStore) EncryptMessageContent(receiverCert *x509.Certificate, content []byte) ([]byte, error) {
+	// Digital envolope
+
+	// Create a random symmetric key
+	dataKey := make([]byte, 32)
+	if _, err := rand.Read(dataKey); err != nil {
+		return nil, err
+	}
+
+	cipher, err := chacha20poly1305.New(dataKey)
+	if err != nil {
+		return nil, err
+	}
+
+	nonce := make([]byte, cipher.NonceSize(), cipher.NonceSize()+len(content)+cipher.Overhead())
+	if _, err = rand.Read(nonce); err != nil {
+		return nil, err
+	}
+
+	// sign the message and append the signature
+	hashedContent := sha256.Sum256(content)
+	signature, err := rsa.SignPKCS1v15(nil, k.privKey, crypto.SHA256, hashedContent[:])
+	if err != nil {
+		return nil, err
+	}
+	content = pair(signature, content)
+	ciphertext := cipher.Seal(nonce, nonce, content, nil)
+
+	receiverPubKey := receiverCert.PublicKey.(*rsa.PublicKey)
+	encryptedDataKey, err := rsa.EncryptOAEP(sha256.New(), rand.Reader, receiverPubKey, dataKey, nil)
+	if err != nil {
+		return nil, err
+	}
+	return pair(encryptedDataKey, ciphertext), nil
+}
+
+func (k KeyStore) DecryptMessageContent(senderCert *x509.Certificate, cipherContent []byte) ([]byte, error) {
+	encryptedDataKey, encryptedMsg := unPair(cipherContent)
+	dataKey, err := rsa.DecryptOAEP(sha256.New(), rand.Reader, k.GetPrivKey(), encryptedDataKey, nil)
+	if err != nil {
+		return nil, err
+	}
+	// decrypt ciphertext
+	cipher, err := chacha20poly1305.New(dataKey)
+	if err != nil {
+		return nil, err
+	}
+
+	nonce, ciphertext := encryptedMsg[:cipher.NonceSize()], encryptedMsg[cipher.NonceSize():]
+	contentAndSig, err := cipher.Open(nil, nonce, ciphertext, nil)
+	if err != nil {
+		return nil, err
+	}
+	// check signature with sender public key
+	signature, content := unPair(contentAndSig)
+	hashedContent := sha256.Sum256(content)
+	senderKey := senderCert.PublicKey.(*rsa.PublicKey)
+	if err := rsa.VerifyPKCS1v15(senderKey, crypto.SHA256, hashedContent[:], signature); err != nil {
+		return nil, err
+	}
+	return content, nil
+}
+
+func pair(l []byte, r []byte) []byte {
+	length := len(l)
+	lenBytes := make([]byte, 2)
+	binary.BigEndian.PutUint16(lenBytes, uint16(length))
+
+	lWithLen := append(lenBytes, l...)
+	return append(lWithLen, r...)
+}
+
+func unPair(pair []byte) ([]byte, []byte) {
+	lenBytes := pair[:2]
+	pair = pair[2:]
+	length := binary.BigEndian.Uint16(lenBytes)
+	l := pair[:length]
+	r := pair[length:]
+	return l, r
+}
--- a/Projs/PD2/internal/utils/networking/client.go
+++ b/Projs/PD2/internal/utils/networking/client.go
@ -0,0 +1,23 @@
+package networking
+
+import (
+	"crypto/tls"
+)
+
+
+type ClientTLSConfigProvider interface {
+    GetClientTLSConfig() *tls.Config
+}
+
+type Client[T any] struct {
+	Connection Connection[T]
+}
+
+func NewClient[T any](clientTLSConfigProvider ClientTLSConfigProvider) (Client[T],error) {
+    dialConn, err := tls.Dial("tcp", "localhost:8080", clientTLSConfigProvider.GetClientTLSConfig())
+	if err != nil {
+        return Client[T]{},err
+	}
+	conn := NewConnection[T](dialConn)
+	return Client[T]{Connection: conn},nil
+}
--- a/Projs/PD2/internal/utils/networking/connection.go
+++ b/Projs/PD2/internal/utils/networking/connection.go
@ -0,0 +1,51 @@
+package networking
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"encoding/json"
+	"io"
+	"log"
+)
+
+type Connection[T any] struct {
+	Conn    *tls.Conn
+	encoder *json.Encoder
+	decoder *json.Decoder
+}
+
+func NewConnection[T any](netConn *tls.Conn) Connection[T] {
+	return Connection[T]{
+		Conn:    netConn,
+		encoder: json.NewEncoder(netConn),
+		decoder: json.NewDecoder(netConn),
+	}
+}
+
+func (c Connection[T]) Send(obj T) error {
+    if err := c.encoder.Encode(&obj); err!=nil {
+		if err == io.EOF {
+			log.Println("Connection closed by peer")
+		} 
+        return err
+    }
+    //Return true as connection active
+    return nil
+}
+
+func (c Connection[T]) Receive() (*T, error) {
+	var obj T
+	if err := c.decoder.Decode(&obj); err != nil {
+		if err == io.EOF {
+			log.Println("Connection closed by peer")
+		} 	
+        return nil,err
+    }
+    //Return true as connection active
+	return &obj, nil
+}
+
+func (c Connection[T]) GetPeerCertificate() *x509.Certificate {
+	state := c.Conn.ConnectionState()
+	return state.PeerCertificates[0]
+}
--- a/Projs/PD2/internal/utils/networking/server.go
+++ b/Projs/PD2/internal/utils/networking/server.go
@ -0,0 +1,56 @@
+package networking
+
+import (
+	"crypto/tls"
+	"log"
+	"net"
+)
+
+type ServerTLSConfigProvider interface {
+	GetServerTLSConfig() *tls.Config
+}
+
+type Server[T any] struct {
+	listener net.Listener
+	C        chan Connection[T]
+}
+
+func NewServer[T any](serverTLSConfigProvider ServerTLSConfigProvider) (Server[T], error) {
+
+	listener, err := tls.Listen("tcp", "127.0.0.1:8080", serverTLSConfigProvider.GetServerTLSConfig())
+	if err != nil {
+		return Server[T]{}, err
+	}
+	return Server[T]{
+		listener: listener,
+		C:        make(chan Connection[T]),
+	}, nil
+}
+
+func (s *Server[T]) ListenLoop() {
+
+	for {
+		listenerConn, err := s.listener.Accept()
+		if err != nil {
+			log.Println("Server could not accept connection")
+            continue
+		}
+		tlsConn, ok := listenerConn.(*tls.Conn)
+		if !ok {
+			log.Println("Connection is not a TLS connection")
+            continue
+		}
+		if err := tlsConn.Handshake(); err != nil {
+			log.Println(err)
+            continue
+		}
+
+		state := tlsConn.ConnectionState()
+		if len(state.PeerCertificates) == 0 {
+			log.Println("Client did not provide a certificate")
+            continue
+		}
+		conn := NewConnection[T](tlsConn)
+		s.C <- conn
+	}
+}
--- a/Projs/PD2/report_content/digital-envelope-diagram.drawio.png
+++ b/Projs/PD2/report_content/digital-envelope-diagram.drawio.png
--- a/Projs/PD2/report_content/digital-envelope-diagram.jpg
+++ b/Projs/PD2/report_content/digital-envelope-diagram.jpg
--- a/Projs/PD2/server.db
+++ b/Projs/PD2/server.db
--- a/Projs/PD2/tokefile.toml
+++ b/Projs/PD2/tokefile.toml
@ -0,0 +1,23 @@
+[targets.setup]
+wildcards=[["golang.org/x/tools/go/analysis/passes/shadow/cmd/shadow@latest"]]
+cmd="go install @@"
+
+[targets.check]
+wildcards=[["go vet ./...","shadow ./..."]]
+cmd="@@"
+
+[targets.build]
+cmd="go build"
+
+[targets.server]
+cmd="go run ./cmd/server/server.go"
+
+[targets.send]
+cmd="go run ./cmd/client/client.go -user certs/client1/client1.p12 send CL2 testsubject"
+
+[targets.askQueue]
+cmd="go run ./cmd/client/client.go -user certs/client2/client2.p12 askqueue"
+
+[targets.fakeAskQueue]
+cmd="go run ./cmd/client/client.go -user certs/FakeClient1/client1.p12 askqueue"
+
--- a/TPs/TP02/py/cfich_aes_cbc.py
+++ b/TPs/TP02/py/cfich_aes_cbc.py
--- a/TPs/TP02/py/cfich_chacha20.py
+++ b/TPs/TP02/py/cfich_chacha20.py
--- a/TPs/TP02/py/chacha20_int_attck.py
+++ b/TPs/TP02/py/chacha20_int_attck.py
--- a/TPs/TP02/py/input.txt.enc
+++ b/TPs/TP02/py/input.txt.enc
@ -1 +0,0 @@
-›US9ÃhMé„(#c…™b¸ÎÙoe@]<5D>.Jµ?K.Óké<6B>|Da¡vz>Z:’‚¯"]
--- a/TPs/TP03/pbenc_aes_ctr_hmac
+++ b/TPs/TP03/pbenc_aes_ctr_hmac
--- a/TPs/TP03/py/plaintext.txt.enc
+++ b/TPs/TP03/py/plaintext.txt.enc
				`@ -1 +0,0 @@`
				`›US9ÃhMé„(#c…™b¸ÎÙoe@]<5D>.Jµ?K.Óké<6B>\|Da¡vz>Z:’‚¯"]`