57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
/* 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@iahu.ca, http://libtomcrypt.org
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*/
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/* OMAC1 Support by Tom St Denis (for 64 and 128 bit block ciphers only) */
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#include "mycrypt.h"
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#ifdef OMAC
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int omac_memory(int cipher,
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const unsigned char *key, unsigned long keylen,
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const unsigned char *msg, unsigned long msglen,
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unsigned char *out, unsigned long *outlen)
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{
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int err;
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omac_state *omac;
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_ARGCHK(key != NULL);
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_ARGCHK(msg != NULL);
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_ARGCHK(out != NULL);
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_ARGCHK(outlen != NULL);
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/* allocate ram for omac state */
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omac = XMALLOC(sizeof(omac_state));
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if (omac == NULL) {
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return CRYPT_MEM;
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}
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/* omac process the message */
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if ((err = omac_init(omac, cipher, key, keylen)) != CRYPT_OK) {
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goto __ERR;
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}
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if ((err = omac_process(omac, msg, msglen)) != CRYPT_OK) {
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goto __ERR;
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}
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if ((err = omac_done(omac, out, outlen)) != CRYPT_OK) {
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goto __ERR;
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}
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err = CRYPT_OK;
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__ERR:
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#ifdef CLEAN_STACK
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zeromem(omac, sizeof(omac_state));
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#endif
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XFREE(omac);
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return err;
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}
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#endif
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