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1 /* crypto/des/ncbc_enc.c */ |
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2 /* |
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3 * #included by: |
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4 * cbc_enc.c (DES_cbc_encrypt) |
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5 * des_enc.c (DES_ncbc_encrypt) |
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6 */ |
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7 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
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8 * All rights reserved. |
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9 * |
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10 * This package is an SSL implementation written |
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11 * by Eric Young (eay@cryptsoft.com). |
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12 * The implementation was written so as to conform with Netscapes SSL. |
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13 * |
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14 * This library is free for commercial and non-commercial use as long as |
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15 * the following conditions are aheared to. The following conditions |
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16 * apply to all code found in this distribution, be it the RC4, RSA, |
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17 * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
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18 * included with this distribution is covered by the same copyright terms |
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19 * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
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20 * |
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21 * Copyright remains Eric Young's, and as such any Copyright notices in |
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22 * the code are not to be removed. |
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23 * If this package is used in a product, Eric Young should be given attribution |
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24 * as the author of the parts of the library used. |
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25 * This can be in the form of a textual message at program startup or |
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26 * in documentation (online or textual) provided with the package. |
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27 * |
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28 * Redistribution and use in source and binary forms, with or without |
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29 * modification, are permitted provided that the following conditions |
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30 * are met: |
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31 * 1. Redistributions of source code must retain the copyright |
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32 * notice, this list of conditions and the following disclaimer. |
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33 * 2. Redistributions in binary form must reproduce the above copyright |
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34 * notice, this list of conditions and the following disclaimer in the |
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35 * documentation and/or other materials provided with the distribution. |
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36 * 3. All advertising materials mentioning features or use of this software |
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37 * must display the following acknowledgement: |
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38 * "This product includes cryptographic software written by |
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39 * Eric Young (eay@cryptsoft.com)" |
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40 * The word 'cryptographic' can be left out if the rouines from the library |
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41 * being used are not cryptographic related :-). |
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42 * 4. If you include any Windows specific code (or a derivative thereof) from |
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43 * the apps directory (application code) you must include an acknowledgement: |
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44 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
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45 * |
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46 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
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47 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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48 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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49 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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50 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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51 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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52 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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53 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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54 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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55 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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56 * SUCH DAMAGE. |
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57 * |
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58 * The licence and distribution terms for any publically available version or |
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59 * derivative of this code cannot be changed. i.e. this code cannot simply be |
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60 * copied and put under another distribution licence |
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61 * [including the GNU Public Licence.] |
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62 */ |
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63 |
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64 #include "des_locl.h" |
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65 |
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66 #ifdef CBC_ENC_C__DONT_UPDATE_IV |
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67 EXPORT_C void DES_cbc_encrypt(const unsigned char *in, unsigned char *out, long length, |
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68 DES_key_schedule *_schedule, DES_cblock *ivec, int enc) |
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69 #else |
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70 EXPORT_C void DES_ncbc_encrypt(const unsigned char *in, unsigned char *out, long length, |
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71 DES_key_schedule *_schedule, DES_cblock *ivec, int enc) |
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72 #endif |
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73 { |
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74 register DES_LONG tin0,tin1; |
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75 register DES_LONG tout0,tout1,xor0,xor1; |
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76 register long l=length; |
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77 DES_LONG tin[2]; |
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78 unsigned char *iv; |
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79 |
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80 iv = &(*ivec)[0]; |
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81 |
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82 if (enc) |
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83 { |
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84 c2l(iv,tout0); |
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85 c2l(iv,tout1); |
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86 for (l-=8; l>=0; l-=8) |
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87 { |
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88 c2l(in,tin0); |
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89 c2l(in,tin1); |
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90 tin0^=tout0; tin[0]=tin0; |
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91 tin1^=tout1; tin[1]=tin1; |
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92 DES_encrypt1((DES_LONG *)tin,_schedule,DES_ENCRYPT); |
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93 tout0=tin[0]; l2c(tout0,out); |
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94 tout1=tin[1]; l2c(tout1,out); |
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95 } |
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96 if (l != -8) |
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97 { |
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98 c2ln(in,tin0,tin1,l+8); |
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99 tin0^=tout0; tin[0]=tin0; |
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100 tin1^=tout1; tin[1]=tin1; |
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101 DES_encrypt1((DES_LONG *)tin,_schedule,DES_ENCRYPT); |
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102 tout0=tin[0]; l2c(tout0,out); |
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103 tout1=tin[1]; l2c(tout1,out); |
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104 } |
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105 #ifndef CBC_ENC_C__DONT_UPDATE_IV |
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106 iv = &(*ivec)[0]; |
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107 l2c(tout0,iv); |
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108 l2c(tout1,iv); |
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109 #endif |
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110 } |
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111 else |
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112 { |
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113 c2l(iv,xor0); |
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114 c2l(iv,xor1); |
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115 for (l-=8; l>=0; l-=8) |
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116 { |
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117 c2l(in,tin0); tin[0]=tin0; |
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118 c2l(in,tin1); tin[1]=tin1; |
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119 DES_encrypt1((DES_LONG *)tin,_schedule,DES_DECRYPT); |
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120 tout0=tin[0]^xor0; |
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121 tout1=tin[1]^xor1; |
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122 l2c(tout0,out); |
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123 l2c(tout1,out); |
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124 xor0=tin0; |
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125 xor1=tin1; |
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126 } |
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127 if (l != -8) |
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128 { |
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129 c2l(in,tin0); tin[0]=tin0; |
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130 c2l(in,tin1); tin[1]=tin1; |
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131 DES_encrypt1((DES_LONG *)tin,_schedule,DES_DECRYPT); |
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132 tout0=tin[0]^xor0; |
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133 tout1=tin[1]^xor1; |
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134 l2cn(tout0,tout1,out,l+8); |
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135 #ifndef CBC_ENC_C__DONT_UPDATE_IV |
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136 xor0=tin0; |
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137 xor1=tin1; |
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138 #endif |
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139 } |
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140 #ifndef CBC_ENC_C__DONT_UPDATE_IV |
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141 iv = &(*ivec)[0]; |
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142 l2c(xor0,iv); |
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143 l2c(xor1,iv); |
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144 #endif |
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145 } |
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146 tin0=tin1=tout0=tout1=xor0=xor1=0; |
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147 tin[0]=tin[1]=0; |
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148 } |