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