78 lines
1.7 KiB
C
78 lines
1.7 KiB
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
|
|
*
|
|
* LibTomCrypt is a library that provides various cryptographic
|
|
* algorithms in a highly modular and flexible manner.
|
|
*
|
|
* The library is free for all purposes without any express
|
|
* guarantee it works.
|
|
*
|
|
* Tom St Denis, tomstdenis@iahu.ca, http://libtomcrypt.org
|
|
*/
|
|
/* Submited by Dobes Vandermeer (dobes@smartt.com) */
|
|
|
|
#include "mycrypt.h"
|
|
|
|
#ifdef HMAC
|
|
|
|
/* hmac_file added by Tom St Denis */
|
|
int hmac_file(int hash, const char *fname,
|
|
const unsigned char *key, unsigned long keylen,
|
|
unsigned char *dst, unsigned long *dstlen)
|
|
{
|
|
#ifdef NO_FILE
|
|
return CRYPT_NOP;
|
|
#else
|
|
hmac_state hmac;
|
|
FILE *in;
|
|
unsigned char buf[512];
|
|
size_t x;
|
|
int err;
|
|
|
|
_ARGCHK(fname != NULL);
|
|
_ARGCHK(key != NULL);
|
|
_ARGCHK(dst != NULL);
|
|
_ARGCHK(dstlen != NULL);
|
|
|
|
if((err = hash_is_valid(hash)) != CRYPT_OK) {
|
|
return err;
|
|
}
|
|
|
|
if ((err = hmac_init(&hmac, hash, key, keylen)) != CRYPT_OK) {
|
|
return err;
|
|
}
|
|
|
|
in = fopen(fname, "rb");
|
|
if (in == NULL) {
|
|
return CRYPT_FILE_NOTFOUND;
|
|
}
|
|
|
|
/* process the file contents */
|
|
do {
|
|
x = fread(buf, 1, sizeof(buf), in);
|
|
if ((err = hmac_process(&hmac, buf, (unsigned long)x)) != CRYPT_OK) {
|
|
/* we don't trap this error since we're already returning an error! */
|
|
fclose(in);
|
|
return err;
|
|
}
|
|
} while (x == sizeof(buf));
|
|
|
|
if (fclose(in) != 0) {
|
|
return CRYPT_ERROR;
|
|
}
|
|
|
|
/* get final hmac */
|
|
if ((err = hmac_done(&hmac, dst, dstlen)) != CRYPT_OK) {
|
|
return err;
|
|
}
|
|
|
|
#ifdef CLEAN_STACK
|
|
/* clear memory */
|
|
zeromem(buf, sizeof(buf));
|
|
#endif
|
|
return CRYPT_OK;
|
|
#endif
|
|
}
|
|
|
|
#endif
|
|
|