/*
* Generate an MD5 cancel lock.
*/
unsigned char *
md5_lock(char *secret, int seclen, char *message, int msglen)
{
unsigned char *cankey, *canlock;
unsigned char hmacbuff[MD5_LENGTH];
unsigned char junk[MD5_LENGTH];
MD5_CTX hash_ctx;
cankey = lock_strip_alpha(md5_key(secret, seclen, message, msglen), junk);
canlock = (char *) malloc(BUFFSIZE);
MD5Init(&hash_ctx);
MD5Update(&hash_ctx, cankey, strlen(cankey));
MD5Final(hmacbuff, &hash_ctx);
strcpy(canlock, "md5:");
(void) b64_ntop(hmacbuff, MD5_LENGTH, canlock + 4, BUFFSIZE);
return (canlock);
}
void create_encrypted_file(char *username, char *objname, char *passphrase){
char filename[strlen(OBJECT_DIR) + strlen(username) + strlen(CONCAT) + strlen(objname) + 1];
char buffer[BUFFERSIZE];
char *plaintext;
unsigned char *iv = create_init_vector();
unsigned char *key = md5_key(passphrase, strlen(passphrase));
snprintf(filename, sizeof(filename), "%s%s%s%s", OBJECT_DIR, username, CONCAT, objname);
plaintext = calloc(1,1);
// Get plaintext
while (fgets(buffer, BUFFERSIZE, stdin) != NULL){
plaintext = realloc(plaintext, strlen(plaintext) + 1 + strlen(buffer));
if (!plaintext) { printf("[Objput ERROR]: fail to read input \n"); exit(-1); }
strcat(plaintext, buffer);
}
// Write encrypted file
Crypto crypto = write_encrypted_file(filename, plaintext, key, iv);
// Save encryption key in a file
save_encryption_key(username, objname, crypto.text_len, passphrase, iv);
printf("[Objput SUCCESS] File %s created. \n", filename);
}