77 lines
2.0 KiB
C
77 lines
2.0 KiB
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
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/* SPDX-License-Identifier: Unlicense */
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#include "tomcrypt_private.h"
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/**
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@file hmac_memory.c
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HMAC support, process a block of memory, Tom St Denis/Dobes Vandermeer
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*/
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#ifdef LTC_HMAC
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/**
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HMAC a block of memory to produce the authentication tag
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@param hash The index of the hash to use
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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 HMAC
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@param inlen The length of the data to HMAC (octets)
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@param out [out] Destination of the authentication tag
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@param outlen [in/out] Max size and resulting size of authentication tag
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@return CRYPT_OK if successful
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*/
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int hmac_memory(int hash,
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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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hmac_state *hmac;
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int err;
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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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/* make sure hash descriptor is valid */
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if ((err = hash_is_valid(hash)) != CRYPT_OK) {
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return err;
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}
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/* is there a descriptor? */
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if (hash_descriptor[hash].hmac_block != NULL) {
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return hash_descriptor[hash].hmac_block(key, keylen, in, inlen, out, outlen);
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}
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/* nope, so call the hmac functions */
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/* allocate ram for hmac state */
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hmac = XMALLOC(sizeof(hmac_state));
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if (hmac == NULL) {
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return CRYPT_MEM;
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}
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if ((err = hmac_init(hmac, hash, key, keylen)) != CRYPT_OK) {
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goto LBL_ERR;
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}
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if ((err = hmac_process(hmac, in, inlen)) != CRYPT_OK) {
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goto LBL_ERR;
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}
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if ((err = hmac_done(hmac, 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(hmac, sizeof(hmac_state));
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#endif
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XFREE(hmac);
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return err;
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}
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#endif
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