1 /* crypto/evp/e_rc4.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay (at) cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59 #include <stdio.h> 60 #include "cryptlib.h" 61 62 #ifndef OPENSSL_NO_RC4 63 64 #include <openssl/evp.h> 65 #include <openssl/objects.h> 66 #include <openssl/rc4.h> 67 68 /* FIXME: surely this is available elsewhere? */ 69 #define EVP_RC4_KEY_SIZE 16 70 71 typedef struct 72 { 73 RC4_KEY ks; /* working key */ 74 } EVP_RC4_KEY; 75 76 #define data(ctx) ((EVP_RC4_KEY *)(ctx)->cipher_data) 77 78 static int rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 79 const unsigned char *iv,int enc); 80 static int rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 81 const unsigned char *in, size_t inl); 82 static const EVP_CIPHER r4_cipher= 83 { 84 NID_rc4, 85 1,EVP_RC4_KEY_SIZE,0, 86 EVP_CIPH_VARIABLE_LENGTH, 87 rc4_init_key, 88 rc4_cipher, 89 NULL, 90 sizeof(EVP_RC4_KEY), 91 NULL, 92 NULL, 93 NULL, 94 NULL 95 }; 96 97 static const EVP_CIPHER r4_40_cipher= 98 { 99 NID_rc4_40, 100 1,5 /* 40 bit */,0, 101 EVP_CIPH_VARIABLE_LENGTH, 102 rc4_init_key, 103 rc4_cipher, 104 NULL, 105 sizeof(EVP_RC4_KEY), 106 NULL, 107 NULL, 108 NULL, 109 NULL 110 }; 111 112 const EVP_CIPHER *EVP_rc4(void) 113 { 114 return(&r4_cipher); 115 } 116 117 const EVP_CIPHER *EVP_rc4_40(void) 118 { 119 return(&r4_40_cipher); 120 } 121 122 static int rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 123 const unsigned char *iv, int enc) 124 { 125 RC4_set_key(&data(ctx)->ks,EVP_CIPHER_CTX_key_length(ctx), 126 key); 127 return 1; 128 } 129 130 static int rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 131 const unsigned char *in, size_t inl) 132 { 133 RC4(&data(ctx)->ks,inl,in,out); 134 return 1; 135 } 136 #endif 137
