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Niels Möller authored
config.h. Rev: src/nettle/ChangeLog:1.195 Rev: src/nettle/aes-decrypt-table.c:1.4 Rev: src/nettle/aes-decrypt.c:1.5 Rev: src/nettle/aes-encrypt-table.c:1.4 Rev: src/nettle/aes-encrypt.c:1.5 Rev: src/nettle/aes-meta.c:1.3 Rev: src/nettle/aes-set-decrypt-key.c:1.2 Rev: src/nettle/aes-set-encrypt-key.c:1.2 Rev: src/nettle/aes.c:1.12 Rev: src/nettle/aesdata.c:1.2 Rev: src/nettle/arcfour-meta.c:1.2 Rev: src/nettle/arcfour.c:1.3 Rev: src/nettle/base16-decode.c:1.2 Rev: src/nettle/base16-encode.c:1.2 Rev: src/nettle/base16-meta.c:1.3 Rev: src/nettle/base64-decode.c:1.5 Rev: src/nettle/base64-encode.c:1.3 Rev: src/nettle/base64-meta.c:1.4 Rev: src/nettle/bignum-random.c:1.3 Rev: src/nettle/bignum.c:1.7 Rev: src/nettle/blowfish.c:1.4 Rev: src/nettle/buffer-init.c:1.3 Rev: src/nettle/buffer.c:1.8 Rev: src/nettle/cast128-meta.c:1.3 Rev: src/nettle/cast128.c:1.4 Rev: src/nettle/cbc.c:1.6 Rev: src/nettle/des-compat.c:1.10 Rev: src/nettle/des.c:1.7 Rev: src/nettle/des3.c:1.2 Rev: src/nettle/dsa-keygen.c:1.6 Rev: src/nettle/dsa-sign.c:1.7 Rev: src/nettle/dsa-verify.c:1.4 Rev: src/nettle/dsa.c:1.5 Rev: src/nettle/examples/io.c:1.4 Rev: src/nettle/examples/nettle-benchmark.c:1.8 Rev: src/nettle/examples/nettle-openssl.c:1.2 Rev: src/nettle/examples/rsa-keygen.c:1.10 Rev: src/nettle/examples/rsa-sign.c:1.5 Rev: src/nettle/examples/rsa-verify.c:1.4 Rev: src/nettle/hmac-md5.c:1.5 Rev: src/nettle/hmac-sha1.c:1.2 Rev: src/nettle/hmac-sha256.c:1.2 Rev: src/nettle/hmac.c:1.4 Rev: src/nettle/knuth-lfib.c:1.2 Rev: src/nettle/md5-compat.c:1.3 Rev: src/nettle/md5-meta.c:1.2 Rev: src/nettle/md5.c:1.6 Rev: src/nettle/memxor.c:1.2 Rev: src/nettle/nettle-internal.c:1.3 Rev: src/nettle/pgp-encode.c:1.4 Rev: src/nettle/pkcs1-rsa-md5.c:1.2 Rev: src/nettle/pkcs1-rsa-sha1.c:1.2 Rev: src/nettle/pkcs1.c:1.2 Rev: src/nettle/realloc.c:1.3 Rev: src/nettle/rsa-compat.c:1.8 Rev: src/nettle/rsa-decrypt.c:1.4 Rev: src/nettle/rsa-encrypt.c:1.5 Rev: src/nettle/rsa-keygen.c:1.5 Rev: src/nettle/rsa-md5-sign.c:1.2 Rev: src/nettle/rsa-md5-verify.c:1.2 Rev: src/nettle/rsa-sha1-sign.c:1.2 Rev: src/nettle/rsa-sha1-verify.c:1.2 Rev: src/nettle/rsa-sign.c:1.3 Rev: src/nettle/rsa-verify.c:1.2 Rev: src/nettle/rsa.c:1.12 Rev: src/nettle/rsa2openpgp.c:1.2 Rev: src/nettle/rsa2sexp.c:1.7 Rev: src/nettle/serpent-meta.c:1.2 Rev: src/nettle/serpent.c:1.4 Rev: src/nettle/sexp-format.c:1.9 Rev: src/nettle/sexp-transport-format.c:1.2 Rev: src/nettle/sexp-transport.c:1.4 Rev: src/nettle/sexp.c:1.14 Rev: src/nettle/sexp2bignum.c:1.5 Rev: src/nettle/sexp2dsa.c:1.4 Rev: src/nettle/sexp2rsa.c:1.11 Rev: src/nettle/sha1-meta.c:1.2 Rev: src/nettle/sha1.c:1.8 Rev: src/nettle/sha256-meta.c:1.2 Rev: src/nettle/sha256.c:1.3 Rev: src/nettle/tools/input.c:1.2 Rev: src/nettle/tools/misc.c:1.2 Rev: src/nettle/tools/output.c:1.3 Rev: src/nettle/tools/parse.c:1.2 Rev: src/nettle/tools/sexp-conv.c:1.14 Rev: src/nettle/twofish-meta.c:1.2 Rev: src/nettle/twofish.c:1.6 Rev: src/nettle/yarrow256.c:1.17 Rev: src/nettle/yarrow_key_event.c:1.4
Niels Möller authoredconfig.h. Rev: src/nettle/ChangeLog:1.195 Rev: src/nettle/aes-decrypt-table.c:1.4 Rev: src/nettle/aes-decrypt.c:1.5 Rev: src/nettle/aes-encrypt-table.c:1.4 Rev: src/nettle/aes-encrypt.c:1.5 Rev: src/nettle/aes-meta.c:1.3 Rev: src/nettle/aes-set-decrypt-key.c:1.2 Rev: src/nettle/aes-set-encrypt-key.c:1.2 Rev: src/nettle/aes.c:1.12 Rev: src/nettle/aesdata.c:1.2 Rev: src/nettle/arcfour-meta.c:1.2 Rev: src/nettle/arcfour.c:1.3 Rev: src/nettle/base16-decode.c:1.2 Rev: src/nettle/base16-encode.c:1.2 Rev: src/nettle/base16-meta.c:1.3 Rev: src/nettle/base64-decode.c:1.5 Rev: src/nettle/base64-encode.c:1.3 Rev: src/nettle/base64-meta.c:1.4 Rev: src/nettle/bignum-random.c:1.3 Rev: src/nettle/bignum.c:1.7 Rev: src/nettle/blowfish.c:1.4 Rev: src/nettle/buffer-init.c:1.3 Rev: src/nettle/buffer.c:1.8 Rev: src/nettle/cast128-meta.c:1.3 Rev: src/nettle/cast128.c:1.4 Rev: src/nettle/cbc.c:1.6 Rev: src/nettle/des-compat.c:1.10 Rev: src/nettle/des.c:1.7 Rev: src/nettle/des3.c:1.2 Rev: src/nettle/dsa-keygen.c:1.6 Rev: src/nettle/dsa-sign.c:1.7 Rev: src/nettle/dsa-verify.c:1.4 Rev: src/nettle/dsa.c:1.5 Rev: src/nettle/examples/io.c:1.4 Rev: src/nettle/examples/nettle-benchmark.c:1.8 Rev: src/nettle/examples/nettle-openssl.c:1.2 Rev: src/nettle/examples/rsa-keygen.c:1.10 Rev: src/nettle/examples/rsa-sign.c:1.5 Rev: src/nettle/examples/rsa-verify.c:1.4 Rev: src/nettle/hmac-md5.c:1.5 Rev: src/nettle/hmac-sha1.c:1.2 Rev: src/nettle/hmac-sha256.c:1.2 Rev: src/nettle/hmac.c:1.4 Rev: src/nettle/knuth-lfib.c:1.2 Rev: src/nettle/md5-compat.c:1.3 Rev: src/nettle/md5-meta.c:1.2 Rev: src/nettle/md5.c:1.6 Rev: src/nettle/memxor.c:1.2 Rev: src/nettle/nettle-internal.c:1.3 Rev: src/nettle/pgp-encode.c:1.4 Rev: src/nettle/pkcs1-rsa-md5.c:1.2 Rev: src/nettle/pkcs1-rsa-sha1.c:1.2 Rev: src/nettle/pkcs1.c:1.2 Rev: src/nettle/realloc.c:1.3 Rev: src/nettle/rsa-compat.c:1.8 Rev: src/nettle/rsa-decrypt.c:1.4 Rev: src/nettle/rsa-encrypt.c:1.5 Rev: src/nettle/rsa-keygen.c:1.5 Rev: src/nettle/rsa-md5-sign.c:1.2 Rev: src/nettle/rsa-md5-verify.c:1.2 Rev: src/nettle/rsa-sha1-sign.c:1.2 Rev: src/nettle/rsa-sha1-verify.c:1.2 Rev: src/nettle/rsa-sign.c:1.3 Rev: src/nettle/rsa-verify.c:1.2 Rev: src/nettle/rsa.c:1.12 Rev: src/nettle/rsa2openpgp.c:1.2 Rev: src/nettle/rsa2sexp.c:1.7 Rev: src/nettle/serpent-meta.c:1.2 Rev: src/nettle/serpent.c:1.4 Rev: src/nettle/sexp-format.c:1.9 Rev: src/nettle/sexp-transport-format.c:1.2 Rev: src/nettle/sexp-transport.c:1.4 Rev: src/nettle/sexp.c:1.14 Rev: src/nettle/sexp2bignum.c:1.5 Rev: src/nettle/sexp2dsa.c:1.4 Rev: src/nettle/sexp2rsa.c:1.11 Rev: src/nettle/sha1-meta.c:1.2 Rev: src/nettle/sha1.c:1.8 Rev: src/nettle/sha256-meta.c:1.2 Rev: src/nettle/sha256.c:1.3 Rev: src/nettle/tools/input.c:1.2 Rev: src/nettle/tools/misc.c:1.2 Rev: src/nettle/tools/output.c:1.3 Rev: src/nettle/tools/parse.c:1.2 Rev: src/nettle/tools/sexp-conv.c:1.14 Rev: src/nettle/twofish-meta.c:1.2 Rev: src/nettle/twofish.c:1.6 Rev: src/nettle/yarrow256.c:1.17 Rev: src/nettle/yarrow_key_event.c:1.4
arcfour.c 2.23 KiB
/* arcfour.c
*
* The arcfour/rc4 stream cipher.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2001 Niels Mller
*
* 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"
#define SWAP(a,b) do { int _t = a; a = b; b = _t; } while(0)
void
arcfour_set_key(struct arcfour_ctx *ctx,
unsigned length, const uint8_t *key)
{
unsigned i, j, k;
assert(length >= ARCFOUR_MIN_KEY_SIZE);
assert(length <= ARCFOUR_MAX_KEY_SIZE);
/* Initialize context */
for (i = 0; i<256; i++)
ctx->S[i] = i;
for (i = j = k = 0; i<256; i++)
{
j += ctx->S[i] + key[k]; j &= 0xff;
SWAP(ctx->S[i], ctx->S[j]);
/* Repeat key as needed */
k = (k + 1) % length;
}
ctx->i = ctx->j = 0;
}
void
arcfour_crypt(struct arcfour_ctx *ctx,
unsigned length, uint8_t *dst,
const uint8_t *src)
{
register uint8_t i, j;
i = ctx->i; j = ctx->j;
while(length--)
{
i++; i &= 0xff; j += ctx->S[i]; j &= 0xff;
SWAP(ctx->S[i], ctx->S[j]);
*dst++ = *src++ ^ ctx->S[ (ctx->S[i] + ctx->S[j]) & 0xff ];
}
ctx->i = i; ctx->j = j;
}
void
arcfour_stream(struct arcfour_ctx *ctx,
unsigned length, uint8_t *dst)
{
register uint8_t i, j;
i = ctx->i; j = ctx->j;
while(length--)
{
i++; i &= 0xff;
j += ctx->S[i]; j &= 0xff;
SWAP(ctx->S[i], ctx->S[j]);
*dst++ = ctx->S[ (ctx->S[i] + ctx->S[j]) & 0xff ];
}
ctx->i = i; ctx->j = j;
}