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author | Niels Möller <nisse@lysator.liu.se> | 2004-02-05 17:02:11 +0100 |
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committer | Niels Möller <nisse@lysator.liu.se> | 2004-02-05 17:02:11 +0100 |
commit | f86be52ec2ba31a11b19ba831db56432c9df2155 (patch) | |
tree | 29c50e3e9c51099c3082fd54fbe5e55c47d3d9e1 /arcfour-crypt.c | |
parent | d27373b5f0bd958862144495bdc5ef452c432fef (diff) | |
download | nettle-f86be52ec2ba31a11b19ba831db56432c9df2155.tar.gz |
* configure.ac: Use assembler file arcfour-crypt.asm if available.
* arcfour.c (arcfour_crypt): Moved function too...
* arcfour-crypt.c (arcfour_crypt): New file.
Rev: src/nettle/Makefile.am:1.69
Rev: src/nettle/arcfour-crypt.c:1.1
Rev: src/nettle/arcfour.c:1.5
Rev: src/nettle/configure.ac:1.29
Diffstat (limited to 'arcfour-crypt.c')
-rw-r--r-- | arcfour-crypt.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/arcfour-crypt.c b/arcfour-crypt.c new file mode 100644 index 00000000..e3d678ff --- /dev/null +++ b/arcfour-crypt.c @@ -0,0 +1,52 @@ +/* arcfour-crypt.c + * + * The arcfour/rc4 stream cipher. + */ + +/* nettle, low-level cryptographics library + * + * Copyright (C) 2001, 2004 Niels Möller + * + * The nettle library is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License as published by + * the Free Software Foundation; either version 2.1 of the License, or (at your + * option) any later version. + * + * The nettle library is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public + * License for more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with the nettle library; see the file COPYING.LIB. If not, write to + * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, + * MA 02111-1307, USA. + */ + +#if HAVE_CONFIG_H +# include "config.h" +#endif + +#include <assert.h> + +#include "arcfour.h" + +void +arcfour_crypt(struct arcfour_ctx *ctx, + unsigned length, uint8_t *dst, + const uint8_t *src) +{ + register uint8_t i, j; + register int si, sj; + + i = ctx->i; j = ctx->j; + while(length--) + { + i++; i &= 0xff; + si = ctx->S[i]; + j += si; j &= 0xff; + sj = ctx->S[i] = ctx->S[j]; + *dst++ = *src++ ^ ctx->S[ (si + sj) & 0xff ]; + } + ctx->i = i; ctx->j = j; +} |