Mercurial > dropbear
view libtomcrypt/src/mac/pmac/pmac_done.c @ 553:8711f20b89ab
- For uclinux, only cleanup on exit for the main process. This avoids
trashing the state when a failing child exits.
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Thu, 09 Jul 2009 16:01:30 +0000 |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
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/* 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, [email protected], http://libtomcrypt.com */ #include "tomcrypt.h" /** @file pmac_done.c PMAC implementation, terminate a session, by Tom St Denis */ #ifdef LTC_PMAC int pmac_done(pmac_state *state, unsigned char *out, unsigned long *outlen) { int err, x; LTC_ARGCHK(state != NULL); LTC_ARGCHK(out != 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; } /* handle padding. If multiple xor in L/x */ if (state->buflen == state->block_len) { /* xor Lr against the checksum */ for (x = 0; x < state->block_len; x++) { state->checksum[x] ^= state->block[x] ^ state->Lr[x]; } } else { /* otherwise xor message bytes then the 0x80 byte */ for (x = 0; x < state->buflen; x++) { state->checksum[x] ^= state->block[x]; } state->checksum[x] ^= 0x80; } /* encrypt it */ if ((err = cipher_descriptor[state->cipher_idx].ecb_encrypt(state->checksum, state->checksum, &state->key)) != CRYPT_OK) { return err; } cipher_descriptor[state->cipher_idx].done(&state->key); /* store it */ for (x = 0; x < state->block_len && x < (int)*outlen; x++) { out[x] = state->checksum[x]; } *outlen = x; #ifdef LTC_CLEAN_STACK zeromem(state, sizeof(*state)); #endif return CRYPT_OK; } #endif /* $Source: /cvs/libtom/libtomcrypt/src/mac/pmac/pmac_done.c,v $ */ /* $Revision: 1.8 $ */ /* $Date: 2006/11/03 00:39:49 $ */