1 /* crypto/evp/e_rc4.c */ 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 #ifndef NO_RC4 60 61 #include <stdio.h> 62 #include "cryptlib.h" 63 #include <openssl/evp.h> 64 #include <openssl/objects.h> 65 66 static int rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 67 const unsigned char *iv,int enc); 68 static int rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 69 const unsigned char *in, unsigned int inl); 70 static EVP_CIPHER r4_cipher= 71 { 72 NID_rc4, 73 1,EVP_RC4_KEY_SIZE,0, 74 EVP_CIPH_VARIABLE_LENGTH, 75 rc4_init_key, 76 rc4_cipher, 77 NULL, 78 sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+ 79 sizeof((((EVP_CIPHER_CTX *)NULL)->c.rc4)), 80 NULL, 81 NULL, 82 NULL 83 }; 84 85 static EVP_CIPHER r4_40_cipher= 86 { 87 NID_rc4_40, 88 1,5 /* 40 bit */,0, 89 EVP_CIPH_VARIABLE_LENGTH, 90 rc4_init_key, 91 rc4_cipher, 92 NULL, 93 sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+ 94 sizeof((((EVP_CIPHER_CTX *)NULL)->c.rc4)), 95 NULL, 96 NULL, 97 NULL 98 }; 99 100 EVP_CIPHER *EVP_rc4(void) 101 { 102 return(&r4_cipher); 103 } 104 105 EVP_CIPHER *EVP_rc4_40(void) 106 { 107 return(&r4_40_cipher); 108 } 109 110 static int rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 111 const unsigned char *iv, int enc) 112 { 113 memcpy(&(ctx->c.rc4.key[0]),key,EVP_CIPHER_CTX_key_length(ctx)); 114 RC4_set_key(&(ctx->c.rc4.ks),EVP_CIPHER_CTX_key_length(ctx), 115 ctx->c.rc4.key); 116 return 1; 117 } 118 119 static int rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 120 const unsigned char *in, unsigned int inl) 121 { 122 RC4(&(ctx->c.rc4.ks),inl,in,out); 123 return 1; 124 } 125 #endif 126