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moved base64 fns to crypto header

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This commit is contained in:
Václav Šmejkal 2025-02-02 14:53:13 +01:00
parent 06b1c8728c
commit 0a9a716ffe
Signed by: ENGO150
GPG Key ID: 4A57E86482968843
2 changed files with 67 additions and 64 deletions
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3
include/chat/crypto.h
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@ -43,6 +43,9 @@ extern "C" {
void why2_chat_init_keys(void); //INIT (POSSIBLY GENERATE) ECC KEYS
void why2_chat_deallocate_keys(void); //DEALLOCATE :) (NO SLUR HERE)
char *why2_chat_base64_encode(char *message, size_t length); //ENCODE message OF length INTO BASE64 WITH LENGTH DELIMITER (WHY2_CHAT_BASE64_LENGTH_DELIMITER)
char *why2_chat_base64_decode(char *encoded_message, size_t *length); //DECODE encoded_message AND SET length TO OUTPUT LENGTH
char *why2_chat_ecc_sign(char *message); //SIGN message WITH ECC KEY
why2_bool why2_chat_ecc_verify_signature(char *message, char *signature, EVP_PKEY *key);

128
src/chat/crypto.c
View File

@ -36,68 +36,6 @@ along with this program. If not, see <https://www.gnu.org/licenses/>.
EVP_PKEY *keypair = NULL; //KEYPAIR
//LOCAL
char *base64_encode(char *message, size_t length)
{
//VARIABLES
BIO *bio;
BIO *b64;
BUF_MEM *buffer_ptr;
char* encoded_message;
//INIT BIOs
b64 = BIO_new(BIO_f_base64());
BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL); //DISABLE NEWLINES
bio = BIO_new(BIO_s_mem());
bio = BIO_push(b64, bio);
//ENCODE
BIO_write(bio, message, length);
BIO_flush(bio);
BIO_get_mem_ptr(bio, &buffer_ptr);
//COPY
encoded_message = why2_malloc(buffer_ptr -> length + why2_count_int_length((int) length) + 2);
memcpy(encoded_message, buffer_ptr -> data, buffer_ptr -> length);
sprintf(encoded_message + buffer_ptr -> length, "%c%zu%c", WHY2_CHAT_BASE64_LENGTH_DELIMITER, length, '\0'); //APPEND LENGTH
//DEALLOCATION
BIO_free_all(bio);
return encoded_message;
}
char *base64_decode(char *encoded_message, size_t *length)
{
//VARIABLES
BIO *bio;
BIO *b64;
char *separator_ptr = strrchr(encoded_message, WHY2_CHAT_BASE64_LENGTH_DELIMITER); //GET THE DELIMITER POINTER
size_t length_local = strtoull(separator_ptr + 1, NULL, 10);
char* decoded_message = why2_malloc(length_local + 1);
int decoded_length;
//INIT BIOs
b64 = BIO_new(BIO_f_base64());
BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL); //DISABLE NEWLINES
bio = BIO_new_mem_buf(encoded_message, separator_ptr - encoded_message);
bio = BIO_push(b64, bio);
//DECODE
decoded_length = BIO_read(bio, decoded_message, length_local);
//NULL-TERM
decoded_message[decoded_length] = '\0';
//DEALLOCATION
BIO_free_all(bio);
//SET length
if (length != NULL) *length = length_local;
return decoded_message;
}
void calculate_ecdh_secret(EVP_PKEY *pri, EVP_PKEY *pub, char **secret, size_t *len)
{
EVP_PKEY_CTX *ctx = EVP_PKEY_CTX_new(pri, NULL);
@ -158,6 +96,68 @@ void why2_chat_init_keys(void)
why2_deallocate(key);
}
char *why2_chat_base64_encode(char *message, size_t length)
{
//VARIABLES
BIO *bio;
BIO *b64;
BUF_MEM *buffer_ptr;
char* encoded_message;
//INIT BIOs
b64 = BIO_new(BIO_f_base64());
BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL); //DISABLE NEWLINES
bio = BIO_new(BIO_s_mem());
bio = BIO_push(b64, bio);
//ENCODE
BIO_write(bio, message, length);
BIO_flush(bio);
BIO_get_mem_ptr(bio, &buffer_ptr);
//COPY
encoded_message = why2_malloc(buffer_ptr -> length + why2_count_int_length((int) length) + 2);
memcpy(encoded_message, buffer_ptr -> data, buffer_ptr -> length);
sprintf(encoded_message + buffer_ptr -> length, "%c%zu%c", WHY2_CHAT_BASE64_LENGTH_DELIMITER, length, '\0'); //APPEND LENGTH
//DEALLOCATION
BIO_free_all(bio);
return encoded_message;
}
char *why2_chat_base64_decode(char *encoded_message, size_t *length)
{
//VARIABLES
BIO *bio;
BIO *b64;
char *separator_ptr = strrchr(encoded_message, WHY2_CHAT_BASE64_LENGTH_DELIMITER); //GET THE DELIMITER POINTER
size_t length_local = strtoull(separator_ptr + 1, NULL, 10);
char* decoded_message = why2_malloc(length_local + 1);
int decoded_length;
//INIT BIOs
b64 = BIO_new(BIO_f_base64());
BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL); //DISABLE NEWLINES
bio = BIO_new_mem_buf(encoded_message, separator_ptr - encoded_message);
bio = BIO_push(b64, bio);
//DECODE
decoded_length = BIO_read(bio, decoded_message, length_local);
//NULL-TERM
decoded_message[decoded_length] = '\0';
//DEALLOCATION
BIO_free_all(bio);
//SET length
if (length != NULL) *length = length_local;
return decoded_message;
}
char *why2_chat_ecc_sign(char *message)
{
//VARIABLES
@ -177,7 +177,7 @@ char *why2_chat_ecc_sign(char *message)
sig = why2_malloc(siglen); //ALLOCATE SIGNATURE
EVP_DigestSignFinal(mdctx, (unsigned char*) sig, &siglen);
encoded_sig = base64_encode(sig, siglen); //CONVERT sig TO BASE64
encoded_sig = why2_chat_base64_encode(sig, siglen); //CONVERT sig TO BASE64
//DEALLOCATION
why2_deallocate(sig);
@ -232,7 +232,7 @@ char *why2_chat_ecc_serialize_public_key()
pubkey[length] = '\0';
//ENCODE
base64_encoded = base64_encode(pubkey, length);
base64_encoded = why2_chat_base64_encode(pubkey, length);
//DEALLOCATION
BIO_free(bio);