Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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 | #include <stdio.h> |
| 60 | #include "cryptlib.h" |
| 61 | |
| 62 | #ifndef OPENSSL_NO_RC4 |
| 63 | |
| 64 | #include <openssl/evp.h> |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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 |