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1 /* crypto/evp/e_rc2.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_RC2 |
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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 "evp_locl.h" |
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67 #include <openssl/rc2.h> |
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68 |
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69 static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, |
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70 const unsigned char *iv,int enc); |
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71 static int rc2_meth_to_magic(EVP_CIPHER_CTX *ctx); |
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72 static int rc2_magic_to_meth(int i); |
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73 static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type); |
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74 static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type); |
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75 static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr); |
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76 |
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77 typedef struct |
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78 { |
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79 int key_bits; /* effective key bits */ |
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80 RC2_KEY ks; /* key schedule */ |
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81 } EVP_RC2_KEY; |
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82 |
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83 #define data(ctx) ((EVP_RC2_KEY *)(ctx)->cipher_data) |
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84 |
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85 IMPLEMENT_BLOCK_CIPHER(rc2, ks, RC2, EVP_RC2_KEY, NID_rc2, |
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86 8, |
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87 RC2_KEY_LENGTH, 8, 64, |
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88 EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT, |
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89 rc2_init_key, NULL, |
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90 rc2_set_asn1_type_and_iv, rc2_get_asn1_type_and_iv, |
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91 rc2_ctrl) |
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92 |
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93 #define RC2_40_MAGIC 0xa0 |
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94 #define RC2_64_MAGIC 0x78 |
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95 #define RC2_128_MAGIC 0x3a |
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96 |
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97 static const EVP_CIPHER r2_64_cbc_cipher= |
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98 { |
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99 NID_rc2_64_cbc, |
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100 8,8 /* 64 bit */,8, |
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101 EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT, |
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102 rc2_init_key, |
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103 rc2_cbc_cipher, |
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104 NULL, |
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105 sizeof(EVP_RC2_KEY), |
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106 rc2_set_asn1_type_and_iv, |
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107 rc2_get_asn1_type_and_iv, |
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108 rc2_ctrl, |
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109 NULL |
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110 }; |
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111 |
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112 static const EVP_CIPHER r2_40_cbc_cipher= |
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113 { |
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114 NID_rc2_40_cbc, |
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115 8,5 /* 40 bit */,8, |
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116 EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT, |
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117 rc2_init_key, |
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118 rc2_cbc_cipher, |
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119 NULL, |
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120 sizeof(EVP_RC2_KEY), |
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121 rc2_set_asn1_type_and_iv, |
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122 rc2_get_asn1_type_and_iv, |
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123 rc2_ctrl, |
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124 NULL |
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125 }; |
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126 |
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127 EXPORT_C const EVP_CIPHER *EVP_rc2_64_cbc(void) |
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128 { |
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129 return(&r2_64_cbc_cipher); |
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130 } |
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131 |
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132 EXPORT_C const EVP_CIPHER *EVP_rc2_40_cbc(void) |
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133 { |
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134 return(&r2_40_cbc_cipher); |
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135 } |
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136 |
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137 static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, |
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138 const unsigned char *iv, int enc) |
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139 { |
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140 RC2_set_key(&data(ctx)->ks,EVP_CIPHER_CTX_key_length(ctx), |
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141 key,data(ctx)->key_bits); |
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142 return 1; |
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143 } |
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144 |
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145 static int rc2_meth_to_magic(EVP_CIPHER_CTX *e) |
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146 { |
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147 int i; |
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148 |
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149 EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i); |
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150 if (i == 128) return(RC2_128_MAGIC); |
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151 else if (i == 64) return(RC2_64_MAGIC); |
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152 else if (i == 40) return(RC2_40_MAGIC); |
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153 else return(0); |
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154 } |
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155 |
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156 static int rc2_magic_to_meth(int i) |
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157 { |
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158 if (i == RC2_128_MAGIC) return 128; |
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159 else if (i == RC2_64_MAGIC) return 64; |
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160 else if (i == RC2_40_MAGIC) return 40; |
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161 else |
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162 { |
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163 EVPerr(EVP_F_RC2_MAGIC_TO_METH,EVP_R_UNSUPPORTED_KEY_SIZE); |
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164 return(0); |
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165 } |
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166 } |
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167 |
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168 static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type) |
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169 { |
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170 long num=0; |
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171 int i=0; |
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172 int key_bits; |
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173 unsigned int l; |
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174 unsigned char iv[EVP_MAX_IV_LENGTH]; |
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175 |
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176 if (type != NULL) |
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177 { |
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178 l=EVP_CIPHER_CTX_iv_length(c); |
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179 OPENSSL_assert(l <= sizeof(iv)); |
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180 i=ASN1_TYPE_get_int_octetstring(type,&num,iv,l); |
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181 if (i != (int)l) |
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182 return(-1); |
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183 key_bits =rc2_magic_to_meth((int)num); |
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184 if (!key_bits) |
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185 return(-1); |
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186 if(i > 0) EVP_CipherInit_ex(c, NULL, NULL, NULL, iv, -1); |
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187 EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS, key_bits, NULL); |
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188 EVP_CIPHER_CTX_set_key_length(c, key_bits / 8); |
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189 } |
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190 return(i); |
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191 } |
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192 |
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193 static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type) |
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194 { |
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195 long num; |
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196 int i=0,j; |
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197 |
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198 if (type != NULL) |
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199 { |
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200 num=rc2_meth_to_magic(c); |
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201 j=EVP_CIPHER_CTX_iv_length(c); |
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202 i=ASN1_TYPE_set_int_octetstring(type,num,c->oiv,j); |
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203 } |
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204 return(i); |
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205 } |
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206 |
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207 static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr) |
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208 { |
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209 switch(type) |
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210 { |
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211 case EVP_CTRL_INIT: |
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212 data(c)->key_bits = EVP_CIPHER_CTX_key_length(c) * 8; |
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213 return 1; |
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214 |
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215 case EVP_CTRL_GET_RC2_KEY_BITS: |
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216 *(int *)ptr = data(c)->key_bits; |
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217 return 1; |
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218 |
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219 case EVP_CTRL_SET_RC2_KEY_BITS: |
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220 if(arg > 0) |
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221 { |
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222 data(c)->key_bits = arg; |
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223 return 1; |
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224 } |
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225 return 0; |
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226 |
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227 default: |
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228 return -1; |
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229 } |
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230 } |
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231 |
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232 #endif |