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76 lines
2.0 KiB
76 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 pmac_done.c
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PMAC implementation, terminate a session, by Tom St Denis
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*/
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#ifdef LTC_PMAC
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int pmac_done(pmac_state *state, unsigned char *out, unsigned long *outlen)
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{
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int err, x;
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LTC_ARGCHK(state != NULL);
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LTC_ARGCHK(out != NULL);
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if ((err = cipher_is_valid(state->cipher_idx)) != CRYPT_OK) {
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return err;
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}
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if ((state->buflen > (int)sizeof(state->block)) || (state->buflen < 0) ||
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(state->block_len > (int)sizeof(state->block)) || (state->buflen > state->block_len)) {
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return CRYPT_INVALID_ARG;
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}
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/* handle padding. If multiple xor in L/x */
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if (state->buflen == state->block_len) {
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/* xor Lr against the checksum */
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for (x = 0; x < state->block_len; x++) {
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state->checksum[x] ^= state->block[x] ^ state->Lr[x];
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}
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} else {
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/* otherwise xor message bytes then the 0x80 byte */
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for (x = 0; x < state->buflen; x++) {
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state->checksum[x] ^= state->block[x];
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}
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state->checksum[x] ^= 0x80;
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}
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/* encrypt it */
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if ((err = cipher_descriptor[state->cipher_idx].ecb_encrypt(state->checksum, state->checksum, &state->key)) != CRYPT_OK) {
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return err;
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}
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cipher_descriptor[state->cipher_idx].done(&state->key);
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/* store it */
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for (x = 0; x < state->block_len && x < (int)*outlen; x++) {
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out[x] = state->checksum[x];
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}
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*outlen = x;
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#ifdef LTC_CLEAN_STACK
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zeromem(state, sizeof(*state));
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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/pmac/pmac_done.c,v $ */
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/* $Revision: 1.8 $ */
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/* $Date: 2006/11/03 00:39:49 $ */
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