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Diffstat (limited to '')
| -rw-r--r-- | cipher/arcfour.c | 165 |
1 files changed, 0 insertions, 165 deletions
diff --git a/cipher/arcfour.c b/cipher/arcfour.c deleted file mode 100644 index 61d0d2988..000000000 --- a/cipher/arcfour.c +++ /dev/null @@ -1,165 +0,0 @@ -/* arcfour.c - The arcfour stream cipher - * Copyright (C) 2000 Free Software Foundation, Inc. - * - * For a description of the algorithm, see: - * Bruce Schneier: Applied Cryptography. John Wiley & Sons, 1996. - * ISBN 0-471-11709-9. Pages 397 ff. - * - * This file is part of GnuPG. - * - * GnuPG is free software; you can redistribute it and/or modify - * it under the terms of 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. - * - * GnuPG 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 a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA - */ - - -#include <config.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include "types.h" -#include "g10lib.h" -#include "arcfour.h" - -static const char *selftest(void); - - -typedef struct { - int idx_i, idx_j; - byte sbox[256]; -} ARCFOUR_context; - - -static void -encrypt_stream( ARCFOUR_context *ctx, - byte *outbuf, const byte *inbuf, unsigned int length ) -{ - int t; - int i = ctx->idx_i; - int j = ctx->idx_j; - byte *sbox = ctx->sbox; - - while ( length-- ) { - i = (i+1) % 256; - j = (j + sbox[i]) % 256; - t = sbox[i]; sbox[i] = sbox[j]; sbox[j] = t; - *outbuf++ = *inbuf++ ^ sbox[(sbox[i] + sbox[j]) % 256]; - } - - ctx->idx_i = i; - ctx->idx_j = j; -} - - -static int -arcfour_setkey( ARCFOUR_context *ctx, const byte *key, unsigned int keylen ) -{ - static int initialized; - static const char* selftest_failed; - int i, j; - byte karr[256]; - - if( !initialized ) { - initialized = 1; - selftest_failed = selftest(); - if( selftest_failed ) - fprintf(stderr,"ARCFOUR selftest failed (%s)\n", selftest_failed ); - } - if( selftest_failed ) - return GCRYERR_SELFTEST; - - if( keylen < 40 ) - return GCRYERR_INV_KEYLEN; - - ctx->idx_i = ctx->idx_j = 0; - for (i=0; i < 256; i++ ) - ctx->sbox[i] = i; - for (i=0; i < 256; i++ ) - karr[i] = key[i%keylen]; - for (i=j=0; i < 256; i++ ) { - int t; - j = (j + ctx->sbox[i] + karr[i]) % 256; - t = ctx->sbox[i]; - ctx->sbox[i] = ctx->sbox[j]; - ctx->sbox[j] = t; - } - memset( karr, 0, 256 ); - - return 0; -} - - -static const char* -selftest(void) -{ - ARCFOUR_context ctx; - byte scratch[16]; - - /* Test vector from Cryptlib labeled there: - * "from the State/Commerce Department" */ - static const byte key_1[] = - { 0x61, 0x8A, 0x63, 0xD2, 0xFB }; - static const byte plaintext_1[] = - { 0xDC, 0xEE, 0x4C, 0xF9, 0x2C }; - static const byte ciphertext_1[] = - { 0xF1, 0x38, 0x29, 0xC9, 0xDE }; - - arcfour_setkey( &ctx, key_1, sizeof(key_1)); - encrypt_stream( &ctx, scratch, plaintext_1, sizeof(plaintext_1)); - if (memcmp (scratch, ciphertext_1, sizeof (ciphertext_1))) - return "Arcfour encryption test 1 failed."; - encrypt_stream(&ctx, scratch, scratch, sizeof(plaintext_1)); /* decrypt */ - if ( memcmp (scratch, plaintext_1, sizeof (plaintext_1))) - return "Arcfour decryption test 1 failed."; - return NULL; -} - - -/**************** - * Return some information about the algorithm. We need algo here to - * distinguish different flavors of the algorithm. - * Returns: A pointer to string describing the algorithm or NULL if - * the ALGO is invalid. - * NOTE: This is a special get_info function which is different from all - * others because arcfour is a stream cipher. We use this hack until - * we have redesign the interface. - */ -const char * -arcfour_get_info( int algo, size_t *keylen, size_t *blocksize, - size_t *contextsize, - int (**r_setkey)( void *c, byte *key, unsigned keylen ), - void (**r_stencrypt)( void *c, byte *outbuf, - byte *inbuf, unsigned int nbytes ), - void (**r_stdecrypt)( void *c, byte *outbuf, - byte *inbuf, unsigned int nbytes ) - ) -{ - *keylen = 128; /* arbitrary value */ - *blocksize = 1; - *contextsize = sizeof(ARCFOUR_context); - *(int (**)(ARCFOUR_context*, byte*, unsigned))r_setkey - = arcfour_setkey; - *(void (**)(ARCFOUR_context*, byte*, const byte*, unsigned))r_stencrypt - = encrypt_stream; - *(void (**)(ARCFOUR_context*, byte*, const byte*, unsigned))r_stdecrypt - = encrypt_stream; - - - if( algo == 301 ) - return "ARCFOUR"; - return NULL; -} - - - - |