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Merge branch 'main' of https://github.com/uminho-mei-es/2324-G05

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This commit is contained in:
LucasVerdelho 2024-03-12 10:27:44 +00:00
commit 9cf699f174
5 changed files with 175 additions and 41 deletions
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17
TPs/TP03/compile_commands.json Normal file
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@ -0,0 +1,17 @@
[
{
"arguments": [
"/usr/bin/gcc",
"-c",
"-Wall",
"-O2",
"-I/opt/homebrew/opt/openssl@3.2/include",
"-o",
"pbenc_aes_ctr_hmac",
"pbenc_aes_ctr_hmac.c"
],
"directory": "/Users/afonso/projects/University/4ano/2sem/ES/2324-G05/TPs/TP03",
"file": "/Users/afonso/projects/University/4ano/2sem/ES/2324-G05/TPs/TP03/pbenc_aes_ctr_hmac.c",
"output": "/Users/afonso/projects/University/4ano/2sem/ES/2324-G05/TPs/TP03/pbenc_aes_ctr_hmac"
}
]

BIN
TPs/TP03/pbenc_aes_ctr_hmac Executable file
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142
TPs/TP03/pbenc_aes_ctr_hmac.c
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@ -19,7 +19,7 @@ int aes_ctr(const char *input_file, const char *output_file, const unsigned char
int input_size = BUF_SIZE;
int output_size = input_size + (cipher_block_size - 1);
int u_len = 0, f_len = 0;
int f_len = 0;
unsigned char input_buf[input_size], output_buf[output_size];
@ -45,30 +45,44 @@ int aes_ctr(const char *input_file, const char *output_file, const unsigned char
return 1;
}
// EVP_MAC *mac = EVP_MAC_fetch(NULL, "HMAC", NULL);
// if (!mac) {
// fprintf(stderr, "Error creating HMAC\n");
// fclose(finput);
// fclose(foutput);
// return 1;
// }
//
// EVP_MAC_CTX *hctx = NULL;
// if (!(hctx = EVP_MAC_CTX_new(mac))) {
// fprintf(stderr, "Error creating HMAC context\n");
// fclose(finput);
// fclose(foutput);
// return 1;
// }
// const OSSL_PARAM params[] = {OSSL_PARAM_UTF8_STRING(OSSL_MAC, "SHA256", 0), OSSL_PARAM_END};
EVP_MAC *mac = EVP_MAC_fetch(NULL, "HMAC", NULL);
if (!mac) {
fprintf(stderr, "Error creating HMAC\n");
fclose(finput);
fclose(foutput);
return 1;
}
// Set the digest type to SHA256
// if (EVP_MAC_CTX_set_params(hctx, EVP_sha256()) != 1) {
// fprintf(stderr, "Error setting HMAC digest type\n");
// fclose(finput);
// fclose(foutput);
// return 1;
// }
EVP_MAC_CTX *hctx = NULL;
if (!(hctx = EVP_MAC_CTX_new(mac))) {
fprintf(stderr, "Error creating HMAC context\n");
fclose(finput);
fclose(foutput);
return 1;
}
// Set parameters for HMAC algorithm
OSSL_PARAM params[2], *p = params;
const EVP_MD *md = EVP_sha256();
*p++ = OSSL_PARAM_construct_utf8_string("digest", (char *)EVP_MD_name(md), 0);
*p = OSSL_PARAM_construct_end();
unsigned char *hmac = malloc(32);
unsigned char *mac_input;
if (enc) {
mac_input = output_buf;
} else {
mac_input = input_buf;
}
fseek(finput, 0, SEEK_END);
long file_size = ftell(finput);
rewind(finput);
if (!enc) {
// Remove the size of the SALT, IV and HMAC from the file size
fseek(finput, 32, SEEK_SET);
file_size -= 64;
}
// If enc is 1, then we are encrypting, else we are decrypting
// If we are encrypting, we need to generate an IV
@ -86,6 +100,7 @@ int aes_ctr(const char *input_file, const char *output_file, const unsigned char
} else {
// Seek forward by 16 bytes to ignore the salt
if (fseek(finput, 16, SEEK_SET) != 0) {
fprintf(stderr, "Error seeking to IV position in input file\n");
return 1;
}
@ -102,7 +117,7 @@ int aes_ctr(const char *input_file, const char *output_file, const unsigned char
return 1;
}
if (EVP_MAC_init(hctx, key, 32, NULL) != 1) {
if (EVP_MAC_init(hctx, key, 32, params) != 1) {
fprintf(stderr, "ERROR: EVP_MAC_init failed. OpenSSL error: %s\n",
ERR_error_string(ERR_get_error(), NULL));
fclose(finput);
@ -110,10 +125,15 @@ int aes_ctr(const char *input_file, const char *output_file, const unsigned char
return 1;
}
int read_size, len;
unsigned char *hmac = (unsigned char *)malloc(32);
while ((read_size = fread(input_buf, 1, BUF_SIZE, finput)) > 0) {
printf("Read %d bytes, passing through CipherUpdate...\n", read_size);
int len;
while (file_size > 0) {
if (file_size < BUF_SIZE) {
BUF_SIZE = file_size;
}
size_t read_size = fread(input_buf, 1, BUF_SIZE, finput);
if (read_size == 0) {
break;
}
if (EVP_CipherUpdate(ctx, output_buf, &len, input_buf, read_size) != 1) {
fprintf(stderr, "ERROR: EVP_CipherUpdate failed. OpenSSL error: %s\n",
ERR_error_string(ERR_get_error(), NULL));
@ -121,17 +141,18 @@ int aes_ctr(const char *input_file, const char *output_file, const unsigned char
fclose(foutput);
return 1;
}
printf("\tGot back %d bytes from CipherUpdate...\n", len);
printf("Writing %d bytes to %s...\n", len, output_file);
if (EVP_MAC_update(hctx, mac_input, read_size) != 1) {
fprintf(stderr, "ERROR: EVP_MAC_update failed. OpenSSL error: %s\n",
ERR_error_string(ERR_get_error(), NULL));
fclose(finput);
fclose(foutput);
return 1;
}
if (fwrite(output_buf, 1, len, foutput) != len) {
fprintf(stderr, "Error writing to output file\n");
return 1;
}
printf("\tWrote %d bytes\n", len);
u_len += len;
}
if (read_size == -1) {
fprintf(stderr, "ERROR: Reading from the file %s failed.\n", input_file);
file_size -= read_size;
}
if (EVP_CipherFinal_ex(ctx, output_buf, &f_len) != 1) {
@ -141,10 +162,22 @@ int aes_ctr(const char *input_file, const char *output_file, const unsigned char
fclose(foutput);
return 1;
}
printf("u_len: %d, f_len: %d\n", u_len, f_len);
size_t m_len = 0;
if (EVP_MAC_final(hctx, hmac, &m_len, 32) != 1) {
fprintf(stderr, "ERROR: EVP_MAC_final failed. OpenSSL error: %s\n",
ERR_error_string(ERR_get_error(), NULL));
fclose(finput);
fclose(foutput);
return 1;
}
if (m_len != 32) {
fprintf(stderr, "ERROR: HMAC length is not 32\n");
fclose(finput);
fclose(foutput);
return 1;
}
if (f_len) {
printf("Writing final %d bytes to %s...\n", f_len, output_file);
if (fwrite(output_buf, 1, f_len, foutput) != f_len) {
fprintf(stderr, "Error writing to output file\n");
fclose(finput);
@ -152,7 +185,32 @@ int aes_ctr(const char *input_file, const char *output_file, const unsigned char
return 1;
}
}
printf("\tWrote last %d bytes\n", f_len);
if (enc) {
if (fwrite(hmac, 1, m_len, foutput) != m_len) {
fprintf(stderr, "Error writing HMAC to file\n");
fclose(finput);
fclose(foutput);
return 1;
}
} else {
unsigned char *hmac2 = malloc(32);
if (fread(hmac2, 1, 32, finput) != 32) {
fprintf(stderr, "Error reading HMAC from file\n");
fclose(finput);
fclose(foutput);
return 1;
}
int cmp = memcmp(hmac, hmac2, 32);
if (cmp == 0) {
printf("HMACs match\n");
} else {
fprintf(stderr, "HMACs do not match\n");
fclose(finput);
fclose(foutput);
return 1;
}
}
fclose(finput);
fclose(foutput);
@ -160,7 +218,7 @@ int aes_ctr(const char *input_file, const char *output_file, const unsigned char
}
int encrypt(char *input_file, const char *passphrase) {
unsigned char key[KEY_SIZE];
unsigned char key[KEY_SIZE * 2];
unsigned char salt[SALT_SIZE];
// Derive key from passphrase using PBKDF2
char *output_file = malloc(strlen(input_file) + 5);
@ -184,8 +242,9 @@ int encrypt(char *input_file, const char *passphrase) {
}
fclose(foutput);
int pass_len = strlen(passphrase);
// Derive key from passphrase using PBKDF2
if (PKCS5_PBKDF2_HMAC(passphrase, strlen(passphrase), salt, SALT_SIZE, ITERATIONS, EVP_sha256(),
if (PKCS5_PBKDF2_HMAC(passphrase, pass_len, salt, SALT_SIZE, ITERATIONS, EVP_sha256(),
KEY_SIZE * 2, key) != 1) {
fprintf(stderr, "Error deriving key from passphrase\n");
return 1;
@ -268,6 +327,7 @@ int main(int argc, char *argv[]) {
return 1;
}
enableEcho();
putchar('\n');
passphrase[strcspn(passphrase, "\n")] = '\0'; // Remove trailing newline
int suc = 0;
if (strcmp(mode, "enc") == 0) {

42
TPs/TP03/plaintext Normal file
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@ -0,0 +1,42 @@
This was a triumph.
I'm making a note here: HUGE SUCCESS.
It's hard to overstate my satisfaction.
Aperture Science
We do what we must because we can.
For the good of all of us
Except the ones who are dead.
But there's no sense crying over every mistake
You just keep on trying till you run out of cake
And the science gets done and you make a neat gun
For the people who are still alive.
I'm not even angry.
I'm being so sincere right now.
Even though you broke my heart and killed me.
And tore me to pieces.
And threw every piece into a fire.
As they burned it hurt because
I was so happy for you!
Now these points of data make a beautiful line
And we're out of beta, we're releasing on time.
So I'm GLaD. I got burned.
Think of all the things we learned
For the people who are still alive.
Go ahead and leave me.
I think I prefer to stay inside.
Maybe you'll find someone else to help you.
Maybe Black Mesa
THAT WAS A JOKE. Haha. FAT CHANCE.
Anyway, this cake is great.
It's so delicious and moist.
Look at me still talking when there's science to do.
When I look out there, it makes me GLaD I'm not you.
I've experiments to run, there is research to be done
On the people who are still alive
And believe me I am still alive.
I'm doing science and I'm still alive.
I feel FANTASTIC and I'm still alive.
While you're dying I'll be still alive.
And when you're dead I will be still alive.
Still alive
Still alive
Still alive

15
TPs/TP03/tokefile.toml Normal file
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@ -0,0 +1,15 @@
[vars]
CC="!which gcc"
CFLAGS="-Wall -O2 -I/opt/homebrew/opt/openssl@3.2/include -L/opt/homebrew/opt/openssl@3.2/lib"
LDFLAGS="-lssl -lcrypto"
[targets.build]
wildcards=["!ls -1 *.c","!ls -1 *.c | sed -e 's/\\.c$//'"]
cmd="${CC} ${CFLAGS} ${LDFLAGS} @@ -o @@"
[targets.debug]
vars.CC="clang"
vars.CFLAGS="-Wall -O0 -g -fsanitize=address -g -I/opt/homebrew/opt/openssl@3.2/include -L/opt/homebrew/opt/openssl@3.2/lib"
wildcards=["!ls -1 *.c","!ls -1 *.c | sed -e 's/\\.c$//'"]
cmd="${CC} ${CFLAGS} ${LDFLAGS} @@ -o @@"