Mercurial > dropbear
view libtomcrypt/src/mac/omac/omac_process.c @ 692:c58a15983808
Allow configuring "allow blank password option" at runtime
Changes this from a compile-time switch to a command-line option.
Signed-off-by: Paul Eggleton <[email protected]>
author | Paul Eggleton <paul.eggleton@linux.intel.com> |
---|---|
date | Tue, 12 Feb 2013 15:52:57 +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 omac_process.c OMAC1 support, process data, Tom St Denis */ #ifdef LTC_OMAC /** Process data through OMAC @param omac The OMAC state @param in The input data to send through OMAC @param inlen The length of the input (octets) @return CRYPT_OK if successful */ int omac_process(omac_state *omac, const unsigned char *in, unsigned long inlen) { unsigned long n, x; int err; LTC_ARGCHK(omac != NULL); LTC_ARGCHK(in != NULL); if ((err = cipher_is_valid(omac->cipher_idx)) != CRYPT_OK) { return err; } if ((omac->buflen > (int)sizeof(omac->block)) || (omac->buflen < 0) || (omac->blklen > (int)sizeof(omac->block)) || (omac->buflen > omac->blklen)) { return CRYPT_INVALID_ARG; } #ifdef LTC_FAST if (omac->buflen == 0 && inlen > 16) { int y; for (x = 0; x < (inlen - 16); x += 16) { for (y = 0; y < 16; y += sizeof(LTC_FAST_TYPE)) { *((LTC_FAST_TYPE*)(&omac->prev[y])) ^= *((LTC_FAST_TYPE*)(&in[y])); } in += 16; if ((err = cipher_descriptor[omac->cipher_idx].ecb_encrypt(omac->prev, omac->prev, &omac->key)) != CRYPT_OK) { return err; } } inlen -= x; } #endif while (inlen != 0) { /* ok if the block is full we xor in prev, encrypt and replace prev */ if (omac->buflen == omac->blklen) { for (x = 0; x < (unsigned long)omac->blklen; x++) { omac->block[x] ^= omac->prev[x]; } if ((err = cipher_descriptor[omac->cipher_idx].ecb_encrypt(omac->block, omac->prev, &omac->key)) != CRYPT_OK) { return err; } omac->buflen = 0; } /* add bytes */ n = MIN(inlen, (unsigned long)(omac->blklen - omac->buflen)); XMEMCPY(omac->block + omac->buflen, in, n); omac->buflen += n; inlen -= n; in += n; } return CRYPT_OK; } #endif /* $Source: /cvs/libtom/libtomcrypt/src/mac/omac/omac_process.c,v $ */ /* $Revision: 1.9 $ */ /* $Date: 2006/11/03 00:39:49 $ */