/**
BLAKE2S MAC a file
@param fname The name of the file you wish to BLAKE2S MAC
@param key The secret key
@param keylen The length of the secret key
@param mac [out] The BLAKE2S MAC authentication tag
@param maclen [in/out] The max size and resulting size of the authentication tag
@return CRYPT_OK if successful, CRYPT_NOP if file support has been disabled
*/
int blake2smac_file(const char *fname, const unsigned char *key, unsigned long keylen, unsigned char *mac, unsigned long *maclen)
{
#ifdef LTC_NO_FILE
LTC_UNUSED_PARAM(fname);
LTC_UNUSED_PARAM(key);
LTC_UNUSED_PARAM(keylen);
LTC_UNUSED_PARAM(mac);
LTC_UNUSED_PARAM(maclen);
return CRYPT_NOP;
#else
blake2smac_state st;
FILE *in;
unsigned char *buf;
size_t x;
int err;
LTC_ARGCHK(fname != NULL);
LTC_ARGCHK(key != NULL);
LTC_ARGCHK(mac != NULL);
LTC_ARGCHK(maclen != NULL);
if ((buf = XMALLOC(LTC_FILE_READ_BUFSIZE)) == NULL) {
return CRYPT_MEM;
}
if ((err = blake2smac_init(&st, *maclen, key, keylen)) != CRYPT_OK) {
goto LBL_ERR;
}
in = fopen(fname, "rb");
if (in == NULL) {
err = CRYPT_FILE_NOTFOUND;
goto LBL_ERR;
}
do {
x = fread(buf, 1, LTC_FILE_READ_BUFSIZE, in);
if ((err = blake2smac_process(&st, buf, (unsigned long)x)) != CRYPT_OK) {
fclose(in);
goto LBL_CLEANBUF;
}
} while (x == LTC_FILE_READ_BUFSIZE);
if (fclose(in) != 0) {
err = CRYPT_ERROR;
goto LBL_CLEANBUF;
}
err = blake2smac_done(&st, mac, maclen);
LBL_CLEANBUF:
zeromem(buf, LTC_FILE_READ_BUFSIZE);
LBL_ERR:
#ifdef LTC_CLEAN_STACK
zeromem(&st, sizeof(blake2smac_state));
#endif
XFREE(buf);
return err;
#endif
}
/**
BLAKE2S MAC a block of memory to produce the authentication tag
@param key The secret key
@param keylen The length of the secret key (octets)
@param in The data to BLAKE2S MAC
@param inlen The length of the data to BLAKE2S MAC (octets)
@param mac [out] Destination of the authentication tag
@param maclen [in/out] Max size and resulting size of authentication tag
@return CRYPT_OK if successful
*/
int blake2smac_memory(const unsigned char *key, unsigned long keylen, const unsigned char *in, unsigned long inlen, unsigned char *mac, unsigned long *maclen)
{
blake2smac_state st;
int err;
LTC_ARGCHK(key != NULL);
LTC_ARGCHK(in != NULL);
LTC_ARGCHK(mac != NULL);
LTC_ARGCHK(maclen != NULL);
if ((err = blake2smac_init(&st, *maclen, key, keylen)) != CRYPT_OK) { goto LBL_ERR; }
if ((err = blake2smac_process(&st, in, inlen)) != CRYPT_OK) { goto LBL_ERR; }
err = blake2smac_done(&st, mac, maclen);
LBL_ERR:
#ifdef LTC_CLEAN_STACK
zeromem(&st, sizeof(blake2smac_state));
#endif
return err;
}