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moved why2_chat_rsa_pub_encrypt body into exp_mod

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so in next commit, which will be decryption, I won't kms
This commit is contained in:
Václav Šmejkal 2024-04-13 13:38:14 +02:00
parent b74995bbab
commit 2a9df2a4b9
Signed by: ENGO150
GPG Key ID: 4A57E86482968843
1 changed files with 25 additions and 20 deletions
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45
src/chat/crypto.c
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@ -76,6 +76,30 @@ void read_file(FILE *file, char **output)
*output = buffer; *output = buffer;
} }
char *exp_mod(long to_encrypt, char *exponent)
{
//VARIABLES
char *output;
mpz_t m, c, n, e;
mpz_init(c);
//GET ALL STUFF
mpz_init_set_si(m, to_encrypt);
mpz_init_set_str(n, why2_get_chat_modulus(), WHY2_CHAT_KEY_BASE);
mpz_init_set_str(e, exponent, 10);
//ENCRYPT MESSAGE
mpz_powm(c, m, e, n);
output = why2_malloc(mpz_sizeinbase(c, WHY2_CHAT_KEY_BASE) + 2); //ALLOCATE OUTPUT
mpz_get_str(output, WHY2_CHAT_KEY_BASE, c); //GET OUTPUT
//DEALLOCATION
mpz_clears(m, c, n, e, NULL);
return output;
}
//GLOBAL //GLOBAL
void why2_chat_init_keys(void) void why2_chat_init_keys(void)
{ {
@ -172,24 +196,5 @@ char *why2_get_chat_d(void)
char *why2_chat_rsa_pub_encrypt(long to_encrypt) char *why2_chat_rsa_pub_encrypt(long to_encrypt)
{ {
//VARIABLES return exp_mod(to_encrypt, WHY2_CHAT_RSA_EXPONENT);
char *output;
mpz_t m, c, n, e;
mpz_init(c);
//GET ALL STUFF
mpz_init_set_si(m, to_encrypt);
mpz_init_set_str(n, why2_get_chat_modulus(), WHY2_CHAT_KEY_BASE);
mpz_init_set_si(e, WHY2_CHAT_RSA_EXPONENT);
//ENCRYPT MESSAGE
mpz_powm(c, m, e, n);
output = why2_malloc(mpz_sizeinbase(c, WHY2_CHAT_KEY_BASE) + 2); //ALLOCATE OUTPUT
mpz_get_str(output, WHY2_CHAT_KEY_BASE, c); //GET OUTPUT
//DEALLOCATION
mpz_clears(m, c, n, e, NULL);
return output;
} }