CSI-ES-2324/Projs/PD1/internal/utils/cryptoUtils/cryptoUtils.go

package cryptoUtils

import (
	"PD1/internal/client"
	"PD1/internal/protocol"
	"crypto/rsa"
	"crypto/x509"
	"fmt"
	"log"
	"os"

	"software.sslmate.com/src/go-pkcs12"
)

func Print() {
	fmt.Println("crypto package")
}

func getUserInfo(certFilename string) (
	rsa.PrivateKey,
	*x509.Certificate,
	[]*x509.Certificate,
	error) {
	var privKey rsa.PrivateKey

	certFile, err := os.ReadFile(certFilename)
	if err != nil {
		log.Panicln("Provided certificate %v couldn't be opened", certFilename)
		return rsa.PrivateKey{}, nil, nil, err
	}

	password := client.AskUserPassword()
	privKeyInterface, cert, caCerts, err := pkcs12.DecodeChain(certFile, password)
	privKey = privKeyInterface.(rsa.PrivateKey)
	if err != nil {
		log.Panicln("PKCS12 key store couldn't be decoded")
		return rsa.PrivateKey{}, nil, nil, err
	}
	if err := privKey.Validate(); err != nil {
		log.Panicln("Private key is not valid")
		return rsa.PrivateKey{}, nil, nil, err
	}
	return privKey, cert, caCerts, nil
}

func encryptMessageContent(privKey rsa.PrivateKey, peerPubKey rsa.PublicKey, content []byte) []byte {
	// Digital envolope

}