diff options
Diffstat (limited to 'core/lib/libtomcrypt/src/encauth/ocb/ocb_shift_xor.c')
| -rw-r--r-- | core/lib/libtomcrypt/src/encauth/ocb/ocb_shift_xor.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/core/lib/libtomcrypt/src/encauth/ocb/ocb_shift_xor.c b/core/lib/libtomcrypt/src/encauth/ocb/ocb_shift_xor.c new file mode 100644 index 0000000..e5c5436 --- /dev/null +++ b/core/lib/libtomcrypt/src/encauth/ocb/ocb_shift_xor.c @@ -0,0 +1,66 @@ +/* + * Copyright (c) 2001-2007, Tom St Denis + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +/* 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@gmail.com, http://libtom.org + */ + +/** + @file ocb_shift_xor.c + OCB implementation, internal function, by Tom St Denis +*/ +#include "tomcrypt.h" + +#ifdef LTC_OCB_MODE + +/** + Compute the shift/xor for OCB (internal function) + @param ocb The OCB state + @param Z The destination of the shift +*/ +void ocb_shift_xor(ocb_state *ocb, unsigned char *Z) +{ + int x, y; + y = ocb_ntz(ocb->block_index++); + for (x = 0; x < ocb->block_len; x++) { + ocb->Li[x] ^= ocb->Ls[y][x]; + Z[x] = ocb->Li[x] ^ ocb->R[x]; + } +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/encauth/ocb/ocb_shift_xor.c,v $ */ +/* $Revision: 1.6 $ */ +/* $Date: 2007/05/12 14:32:35 $ */ |