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1 /* crypto/des/fcrypt_b.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 |
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61 /* This version of crypt has been developed from my MIT compatible |
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62 * DES library. |
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63 * The library is available at pub/Crypto/DES at ftp.psy.uq.oz.au |
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64 * Eric Young (eay@cryptsoft.com) |
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65 */ |
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66 |
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67 #define DES_FCRYPT |
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68 #include "des_locl.h" |
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69 #undef DES_FCRYPT |
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70 |
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71 #undef PERM_OP |
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72 #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\ |
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73 (b)^=(t),\ |
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74 (a)^=((t)<<(n))) |
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75 |
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76 #undef HPERM_OP |
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77 #define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\ |
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78 (a)=(a)^(t)^(t>>(16-(n))))\ |
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79 |
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80 EXPORT_C void fcrypt_body(DES_LONG *out, DES_key_schedule *ks, DES_LONG Eswap0, |
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81 DES_LONG Eswap1) |
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82 { |
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83 register DES_LONG l,r,t,u; |
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84 #ifdef DES_PTR |
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85 register const unsigned char *des_SP=(const unsigned char *)DES_SPtrans; |
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86 #endif |
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87 register DES_LONG *s; |
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88 register int j; |
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89 register DES_LONG E0,E1; |
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90 |
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91 l=0; |
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92 r=0; |
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93 |
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94 s=(DES_LONG *)ks; |
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95 E0=Eswap0; |
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96 E1=Eswap1; |
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97 |
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98 for (j=0; j<25; j++) |
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99 { |
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100 #ifndef DES_UNROLL |
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101 register int i; |
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102 |
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103 for (i=0; i<32; i+=8) |
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104 { |
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105 D_ENCRYPT(l,r,i+0); /* 1 */ |
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106 D_ENCRYPT(r,l,i+2); /* 2 */ |
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107 D_ENCRYPT(l,r,i+4); /* 1 */ |
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108 D_ENCRYPT(r,l,i+6); /* 2 */ |
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109 } |
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110 #else |
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111 D_ENCRYPT(l,r, 0); /* 1 */ |
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112 D_ENCRYPT(r,l, 2); /* 2 */ |
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113 D_ENCRYPT(l,r, 4); /* 3 */ |
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114 D_ENCRYPT(r,l, 6); /* 4 */ |
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115 D_ENCRYPT(l,r, 8); /* 5 */ |
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116 D_ENCRYPT(r,l,10); /* 6 */ |
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117 D_ENCRYPT(l,r,12); /* 7 */ |
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118 D_ENCRYPT(r,l,14); /* 8 */ |
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119 D_ENCRYPT(l,r,16); /* 9 */ |
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120 D_ENCRYPT(r,l,18); /* 10 */ |
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121 D_ENCRYPT(l,r,20); /* 11 */ |
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122 D_ENCRYPT(r,l,22); /* 12 */ |
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123 D_ENCRYPT(l,r,24); /* 13 */ |
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124 D_ENCRYPT(r,l,26); /* 14 */ |
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125 D_ENCRYPT(l,r,28); /* 15 */ |
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126 D_ENCRYPT(r,l,30); /* 16 */ |
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127 #endif |
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128 |
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129 t=l; |
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130 l=r; |
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131 r=t; |
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132 } |
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133 l=ROTATE(l,3)&0xffffffffL; |
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134 r=ROTATE(r,3)&0xffffffffL; |
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135 |
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136 PERM_OP(l,r,t, 1,0x55555555L); |
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137 PERM_OP(r,l,t, 8,0x00ff00ffL); |
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138 PERM_OP(l,r,t, 2,0x33333333L); |
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139 PERM_OP(r,l,t,16,0x0000ffffL); |
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140 PERM_OP(l,r,t, 4,0x0f0f0f0fL); |
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141 |
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142 out[0]=r; |
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143 out[1]=l; |
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144 } |
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145 |