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84 lines
2.2 KiB
C
84 lines
2.2 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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#include "tomcrypt.h"
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/**
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@file omac_memory.c
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OMAC1 support, process a block of memory, Tom St Denis
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*/
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#ifdef LTC_OMAC
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/**
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OMAC a block of memory
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@param cipher The index of the desired cipher
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@param key The secret key
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@param keylen The length of the secret key (octets)
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@param in The data to send through OMAC
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@param inlen The length of the data to send through OMAC (octets)
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@param out [out] The destination of the authentication tag
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@param outlen [in/out] The max size and resulting size of the authentication tag (octets)
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@return CRYPT_OK if successful
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*/
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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 *in, unsigned long inlen,
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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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LTC_ARGCHK(key != NULL);
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LTC_ARGCHK(in != NULL);
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LTC_ARGCHK(out != NULL);
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LTC_ARGCHK(outlen != NULL);
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/* is the cipher valid? */
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if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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return err;
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}
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/* Use accelerator if found */
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if (cipher_descriptor[cipher].omac_memory != NULL) {
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return cipher_descriptor[cipher].omac_memory(key, keylen, in, inlen, out, outlen);
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}
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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 LBL_ERR;
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}
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if ((err = omac_process(omac, in, inlen)) != CRYPT_OK) {
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goto LBL_ERR;
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}
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if ((err = omac_done(omac, out, outlen)) != CRYPT_OK) {
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goto LBL_ERR;
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}
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err = CRYPT_OK;
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LBL_ERR:
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#ifdef LTC_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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/* ref: HEAD -> master, tag: v1.18.2 */
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/* git commit: 7e7eb695d581782f04b24dc444cbfde86af59853 */
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/* commit time: 2018-07-01 22:49:01 +0200 */
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