63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
|
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
|
||
|
|
*
|
||
|
|
* LibTomCrypt is a library that provides various cryptographic
|
||
|
|
* algorithms in a highly modular and flexible manner.
|
||
|
|
*
|
||
|
|
* The library is free for all purposes without any express
|
||
|
|
* guarantee it works.
|
||
|
|
*
|
||
|
|
* Tom St Denis, tomstdenis@iahu.ca, http://libtomcrypt.org
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* PMAC implementation by Tom St Denis */
|
||
|
|
#include "mycrypt.h"
|
||
|
|
|
||
|
|
#ifdef PMAC
|
||
|
|
|
||
|
|
int pmac_process(pmac_state *state, const unsigned char *buf, unsigned long len)
|
||
|
|
{
|
||
|
|
int err, n, x;
|
||
|
|
unsigned char Z[MAXBLOCKSIZE];
|
||
|
|
|
||
|
|
_ARGCHK(state != NULL);
|
||
|
|
_ARGCHK(buf != NULL);
|
||
|
|
if ((err = cipher_is_valid(state->cipher_idx)) != CRYPT_OK) {
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ((state->buflen > (int)sizeof(state->block)) || (state->buflen < 0) ||
|
||
|
|
(state->block_len > (int)sizeof(state->block)) || (state->buflen > state->block_len)) {
|
||
|
|
return CRYPT_INVALID_ARG;
|
||
|
|
}
|
||
|
|
|
||
|
|
while (len != 0) {
|
||
|
|
/* ok if the block is full we xor in prev, encrypt and replace prev */
|
||
|
|
if (state->buflen == state->block_len) {
|
||
|
|
pmac_shift_xor(state);
|
||
|
|
for (x = 0; x < state->block_len; x++) {
|
||
|
|
Z[x] = state->Li[x] ^ state->block[x];
|
||
|
|
}
|
||
|
|
cipher_descriptor[state->cipher_idx].ecb_encrypt(Z, Z, &state->key);
|
||
|
|
for (x = 0; x < state->block_len; x++) {
|
||
|
|
state->checksum[x] ^= Z[x];
|
||
|
|
}
|
||
|
|
state->buflen = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* add bytes */
|
||
|
|
n = MIN(len, (unsigned long)(state->block_len - state->buflen));
|
||
|
|
memcpy(state->block + state->buflen, buf, n);
|
||
|
|
state->buflen += n;
|
||
|
|
len -= n;
|
||
|
|
buf += n;
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef CLEAN_STACK
|
||
|
|
zeromem(Z, sizeof(Z));
|
||
|
|
#endif
|
||
|
|
|
||
|
|
return CRYPT_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|