88 lines
2.5 KiB
C
88 lines
2.5 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 omac_memory_multi.c
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OMAC1 support, process multiple blocks of memory, Tom St Denis
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*/
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#ifdef LTC_OMAC
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static LTC_INLINE int s_omac_vprocess(omac_state *omac, const unsigned char *in, unsigned long inlen, va_list args)
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{
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const unsigned char * curptr = in;
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unsigned long curlen = inlen;
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int err;
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for (;;) {
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/* process buf */
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if ((err = omac_process(omac, curptr, curlen)) != CRYPT_OK) {
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return err;
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}
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/* step to next */
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curptr = va_arg(args, const unsigned char*);
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if (curptr == NULL) {
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break;
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}
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curlen = va_arg(args, unsigned long);
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}
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return CRYPT_OK;
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}
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int omac_vprocess(omac_state *omac, const unsigned char *in, unsigned long inlen, va_list args)
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{
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return s_omac_vprocess(omac, in, inlen, args);
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}
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/**
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OMAC multiple blocks 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 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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@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 ... tuples of (data,len) pairs to OMAC, terminated with a (NULL,x) (x=don't care)
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@return CRYPT_OK if successful
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*/
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int omac_memory_multi(int cipher,
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const unsigned char *key, unsigned long keylen,
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unsigned char *out, unsigned long *outlen,
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const unsigned char *in, unsigned long inlen, ...)
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{
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int err;
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omac_state *omac;
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va_list args;
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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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/* 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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va_start(args, inlen);
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if ((err = s_omac_vprocess(omac, in, inlen, args)) != CRYPT_OK) {
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goto LBL_ERR;
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}
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err = omac_done(omac, out, outlen);
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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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va_end(args);
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return err;
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}
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#endif
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