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88 lines
2.2 KiB
88 lines
2.2 KiB
9 years ago
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*
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* Tom St Denis, tomstdenis@gmail.com, http://libtom.org
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*/
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#include "tomcrypt.h"
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/**
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@file hmac_file.c
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LTC_HMAC support, process a file, Tom St Denis/Dobes Vandermeer
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*/
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#ifdef LTC_HMAC
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/**
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LTC_HMAC a file
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@param hash The index of the hash you wish to use
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@param fname The name of the file you wish to LTC_HMAC
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@param key The secret key
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@param keylen The length of the secret key
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@param out [out] The LTC_HMAC authentication tag
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@param outlen [in/out] The max size and resulting size of the authentication tag
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@return CRYPT_OK if successful, CRYPT_NOP if file support has been disabled
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*/
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int hmac_file(const struct ltc_hash_descriptor *hash, const char *fname, const unsigned char *key, unsigned long keylen,unsigned char *out, unsigned long *outlen)
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{
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#ifdef LTC_NO_FILE
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return CRYPT_NOP;
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#else
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hmac_state hmac;
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FILE *in;
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unsigned char buf[512];
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size_t x;
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int err;
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LTC_ARGCHK(fname != NULL);
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LTC_ARGCHK(key != NULL);
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LTC_ARGCHK(out != NULL);
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LTC_ARGCHK(outlen != NULL);
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if ((err = hmac_init(&hmac, hash, key, keylen)) != CRYPT_OK) {
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return err;
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}
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in = fopen(fname, "rb");
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if (in == NULL) {
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return CRYPT_FILE_NOTFOUND;
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}
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/* process the file contents */
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do {
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x = fread(buf, 1, sizeof(buf), in);
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if ((err = hmac_process(&hmac, hash, buf, (unsigned long)x)) != CRYPT_OK) {
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/* we don't trap this error since we're already returning an error! */
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fclose(in);
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return err;
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}
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} while (x == sizeof(buf));
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if (fclose(in) != 0) {
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return CRYPT_ERROR;
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}
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/* get final hmac */
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if ((err = hmac_done(&hmac, hash, out, outlen)) != CRYPT_OK) {
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return err;
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}
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#ifdef LTC_CLEAN_STACK
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/* clear memory */
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zeromem(buf, sizeof(buf));
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#endif
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return CRYPT_OK;
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#endif
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}
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#endif
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/* $Source: /cvs/libtom/libtomcrypt/src/mac/hmac/hmac_file.c,v $ */
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/* $Revision: 1.7 $ */
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/* $Date: 2007/05/12 14:37:41 $ */
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