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-rw-r--r--arcfour-crypt.c61
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diff --git a/arcfour-crypt.c b/arcfour-crypt.c
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-/* arcfour-crypt.c
-
- The arcfour/rc4 stream cipher.
-
- Copyright (C) 2001, 2004 Niels Möller
-
- This file is part of GNU Nettle.
-
- GNU Nettle is free software: you can redistribute it and/or
- modify it under the terms of either:
-
- * the GNU Lesser General Public License as published by the Free
- Software Foundation; either version 3 of the License, or (at your
- option) any later version.
-
- or
-
- * the GNU General Public License as published by the Free
- Software Foundation; either version 2 of the License, or (at your
- option) any later version.
-
- or both in parallel, as here.
-
- GNU Nettle 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
- General Public License for more details.
-
- You should have received copies of the GNU General Public License and
- the GNU Lesser General Public License along with this program. If
- not, see http://www.gnu.org/licenses/.
-*/
-
-#if HAVE_CONFIG_H
-# include "config.h"
-#endif
-
-#include <assert.h>
-
-#include "arcfour.h"
-
-void
-arcfour_crypt(struct arcfour_ctx *ctx,
- size_t 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];
- ctx->S[j] = si;
- *dst++ = *src++ ^ ctx->S[ (si + sj) & 0xff ];
- }
- ctx->i = i; ctx->j = j;
-}