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89 lines
2.1 KiB
89 lines
2.1 KiB
/* 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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#include "tomcrypt.h"
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#ifdef LTC_BLAKE2BMAC
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/**
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BLAKE2B MAC a file
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@param fname The name of the file you wish to BLAKE2B MAC
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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 mac [out] The BLAKE2B MAC authentication tag
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@param maclen [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 blake2bmac_file(const char *fname, const unsigned char *key, unsigned long keylen, unsigned char *mac, unsigned long *maclen)
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{
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#ifdef LTC_NO_FILE
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LTC_UNUSED_PARAM(fname);
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LTC_UNUSED_PARAM(key);
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LTC_UNUSED_PARAM(keylen);
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LTC_UNUSED_PARAM(mac);
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LTC_UNUSED_PARAM(maclen);
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return CRYPT_NOP;
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#else
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blake2bmac_state st;
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FILE *in;
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unsigned char *buf;
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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(mac != NULL);
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LTC_ARGCHK(maclen != NULL);
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if ((buf = XMALLOC(LTC_FILE_READ_BUFSIZE)) == NULL) {
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return CRYPT_MEM;
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}
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if ((err = blake2bmac_init(&st, *maclen, key, keylen)) != CRYPT_OK) {
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goto LBL_ERR;
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}
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in = fopen(fname, "rb");
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if (in == NULL) {
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err = CRYPT_FILE_NOTFOUND;
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goto LBL_ERR;
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}
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do {
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x = fread(buf, 1, LTC_FILE_READ_BUFSIZE, in);
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if ((err = blake2bmac_process(&st, buf, (unsigned long)x)) != CRYPT_OK) {
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fclose(in);
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goto LBL_CLEANBUF;
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}
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} while (x == LTC_FILE_READ_BUFSIZE);
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if (fclose(in) != 0) {
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err = CRYPT_ERROR;
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goto LBL_CLEANBUF;
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}
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err = blake2bmac_done(&st, mac, maclen);
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LBL_CLEANBUF:
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zeromem(buf, LTC_FILE_READ_BUFSIZE);
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LBL_ERR:
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#ifdef LTC_CLEAN_STACK
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zeromem(&st, sizeof(blake2bmac_state));
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#endif
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XFREE(buf);
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return err;
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#endif
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}
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#endif
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/* ref: $Format:%D$ */
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/* git commit: $Format:%H$ */
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/* commit time: $Format:%ai$ */
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