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79 lines
2.0 KiB
79 lines
2.0 KiB
#define LTC_SOURCE
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/* 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@gmail.com, http://libtomcrypt.com
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*/
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#include "tomcrypt.h"
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/**
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@file f9_done.c
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f9 Support, terminate the state
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*/
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#ifdef LTC_F9_MODE
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/** Terminate the f9-MAC state
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@param f9 f9 state to terminate
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@param out [out] Destination for the MAC tag
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@param outlen [in/out] Destination size and final tag size
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Return CRYPT_OK on success
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*/
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int f9_done(f9_state *f9, unsigned char *out, unsigned long *outlen)
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{
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int err, x;
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LTC_ARGCHK(f9 != NULL);
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LTC_ARGCHK(out != NULL);
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/* check structure */
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if ((err = cipher_is_valid(f9->cipher)) != CRYPT_OK) {
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return err;
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}
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if ((f9->blocksize > cipher_descriptor[f9->cipher].block_length) || (f9->blocksize < 0) ||
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(f9->buflen > f9->blocksize) || (f9->buflen < 0)) {
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return CRYPT_INVALID_ARG;
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}
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if (f9->buflen != 0) {
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/* encrypt */
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cipher_descriptor[f9->cipher].ecb_encrypt(f9->IV, f9->IV, &f9->key);
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f9->buflen = 0;
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for (x = 0; x < f9->blocksize; x++) {
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f9->ACC[x] ^= f9->IV[x];
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}
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}
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/* schedule modified key */
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if ((err = cipher_descriptor[f9->cipher].setup(f9->akey, f9->keylen, 0, &f9->key)) != CRYPT_OK) {
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return err;
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}
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/* encrypt the ACC */
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cipher_descriptor[f9->cipher].ecb_encrypt(f9->ACC, f9->ACC, &f9->key);
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cipher_descriptor[f9->cipher].done(&f9->key);
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/* extract tag */
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for (x = 0; x < f9->blocksize && (unsigned long)x < *outlen; x++) {
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out[x] = f9->ACC[x];
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}
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*outlen = x;
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#ifdef LTC_CLEAN_STACK
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zeromem(f9, sizeof(*f9));
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#endif
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return CRYPT_OK;
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}
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#endif
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/* $Source: /cvs/libtom/libtomcrypt/src/mac/f9/f9_done.c,v $ */
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/* $Revision: 1.5 $ */
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/* $Date: 2006/11/09 01:53:32 $ */
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