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implemented base64 delimiter

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This commit is contained in:
Václav Šmejkal 2025-01-30 19:38:47 +01:00
parent b859c88dcc
commit 210d23369b
Signed by: ENGO150
GPG Key ID: 4A57E86482968843
1 changed files with 18 additions and 10 deletions
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26
src/chat/crypto.c
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@ -35,7 +35,7 @@ along with this program. If not, see <https://www.gnu.org/licenses/>.
EVP_PKEY *keypair = NULL; //KEYPAIR EVP_PKEY *keypair = NULL; //KEYPAIR
//LOCAL //LOCAL
char* base64_encode(char *message) char *base64_encode(char *message, size_t length)
{ {
//VARIABLES //VARIABLES
BIO *bio; BIO *bio;
@ -45,18 +45,20 @@ char* base64_encode(char *message)
//INIT BIOs //INIT BIOs
b64 = BIO_new(BIO_f_base64()); 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_new(BIO_s_mem());
bio = BIO_push(b64, bio); bio = BIO_push(b64, bio);
//ENCODE //ENCODE
BIO_write(bio, message, strlen(message)); BIO_write(bio, message, length);
BIO_flush(bio); BIO_flush(bio);
BIO_get_mem_ptr(bio, &buffer_ptr); BIO_get_mem_ptr(bio, &buffer_ptr);
//COPY //COPY
encoded_message = why2_malloc(buffer_ptr -> length + 1); encoded_message = why2_malloc(buffer_ptr -> length + why2_count_int_length((int) length) + 2);
memcpy(encoded_message, buffer_ptr -> data, buffer_ptr -> length); memcpy(encoded_message, buffer_ptr -> data, buffer_ptr -> length);
encoded_message[buffer_ptr -> length] = '\0';
sprintf(encoded_message + buffer_ptr -> length, "%c%zu%c", WHY2_CHAT_BASE64_LENGTH_DELIMITER, length, '\0'); //APPEND LENGTH
//DEALLOCATION //DEALLOCATION
BIO_free_all(bio); BIO_free_all(bio);
@ -69,16 +71,22 @@ char* base64_decode(char *encoded_message)
//VARIABLES //VARIABLES
BIO *bio; BIO *bio;
BIO *b64; BIO *b64;
size_t length = strlen(encoded_message); char *separator_ptr = strrchr(encoded_message, WHY2_CHAT_BASE64_LENGTH_DELIMITER); //GET THE DELIMITER POINTER
char* decoded_message = why2_malloc(length); size_t length = strtoull(separator_ptr + 1, NULL, 10);
char* decoded_message = why2_malloc(length + 1);
int decoded_length;
//INIT BIOs //INIT BIOs
b64 = BIO_new(BIO_f_base64()); b64 = BIO_new(BIO_f_base64());
bio = BIO_new_mem_buf(encoded_message, length); 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); bio = BIO_push(b64, bio);
//DECODE
decoded_length = BIO_read(bio, decoded_message, length);
//NULL-TERM //NULL-TERM
decoded_message[BIO_read(bio, decoded_message, length)] = '\0'; decoded_message[decoded_length] = '\0';
//DEALLOCATION //DEALLOCATION
BIO_free_all(bio); BIO_free_all(bio);
@ -148,7 +156,7 @@ char *why2_chat_ecc_sign(char *message)
sig = why2_malloc(siglen); //ALLOCATE SIGNATURE sig = why2_malloc(siglen); //ALLOCATE SIGNATURE
EVP_DigestSignFinal(mdctx, (unsigned char*) sig, &siglen); EVP_DigestSignFinal(mdctx, (unsigned char*) sig, &siglen);
encoded_sig = base64_encode(sig); //CONVERT sig TO BASE64 encoded_sig = base64_encode(sig, siglen); //CONVERT sig TO BASE64
//DEALLOCATION //DEALLOCATION
why2_deallocate(sig); why2_deallocate(sig);