1 /* $OpenBSD: e_rc4.c,v 1.13 2014/07/10 22:45:57 jsing Exp $ */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@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@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@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@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 61 #include <openssl/opensslconf.h> 62 63 #ifndef OPENSSL_NO_RC4 64 65 #include <openssl/evp.h> 66 #include <openssl/objects.h> 67 #include <openssl/rc4.h> 68 69 #include "evp_locl.h" 70 71 /* FIXME: surely this is available elsewhere? */ 72 #define EVP_RC4_KEY_SIZE 16 73 74 typedef struct { 75 RC4_KEY ks; /* working key */ 76 } EVP_RC4_KEY; 77 78 #define data(ctx) ((EVP_RC4_KEY *)(ctx)->cipher_data) 79 80 static int rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 81 const unsigned char *iv, int enc); 82 static int rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 83 const unsigned char *in, size_t inl); 84 85 static const EVP_CIPHER r4_cipher = { 86 NID_rc4, 87 1, EVP_RC4_KEY_SIZE, 0, 88 EVP_CIPH_VARIABLE_LENGTH, 89 rc4_init_key, 90 rc4_cipher, 91 NULL, 92 sizeof(EVP_RC4_KEY), 93 NULL, 94 NULL, 95 NULL, 96 NULL 97 }; 98 99 static const EVP_CIPHER r4_40_cipher = { 100 NID_rc4_40, 101 1, 5 /* 40 bit */, 0, 102 EVP_CIPH_VARIABLE_LENGTH, 103 rc4_init_key, 104 rc4_cipher, 105 NULL, 106 sizeof(EVP_RC4_KEY), 107 NULL, 108 NULL, 109 NULL, 110 NULL 111 }; 112 113 const EVP_CIPHER * 114 EVP_rc4(void) 115 { 116 return (&r4_cipher); 117 } 118 119 const EVP_CIPHER * 120 EVP_rc4_40(void) 121 { 122 return (&r4_40_cipher); 123 } 124 125 static int 126 rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 127 const unsigned char *iv, int enc) 128 { 129 RC4_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx), key); 130 return 1; 131 } 132 133 static int 134 rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 135 const unsigned char *in, size_t inl) 136 { 137 RC4(&data(ctx)->ks, inl, in, out); 138 return 1; 139 } 140 #endif 141