FreeCalypso > hg > freecalypso-tools

annotate rvinterf/etmsync/cl_des.c @ 1011:6d9b10633f10 default tip

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etmsync Pirelli IMEI retrieval: fix poor use of printf() Bug reported by Vadim Yanitskiy <fixeria@osmocom.org>: the construct where a static-allocated string was passed to printf() without any format arguments causes newer compilers to report a security problem. Given that formatted output is not needed here, just fixed string output, change printf() to fputs(), and direct the error message to stderr while at it.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 23 May 2024 17:29:57 +0000
parents 3d148edb87c2
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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14
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1 /*
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2 * This DES implementation is used for the purpose of decrypting
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3 * Pirelli's factory IMEI record; it has been lifted out of TI's
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4 * reference GSM firmware source.
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5 */
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6
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7 #include "cl_des.h"
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8
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9 typedef unsigned char UBYTE;
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10
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11 /* 64+64+17*56+16*48+64+17*32+17*32 = 3000 bytes */
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12 static UBYTE binmsg[64] , binkey[64], cd[17][56] , deskey[16][48] , ip[64];
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13 static UBYTE l[17][32] , r[17][32];
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14 /* 64+64+32+32+64+64+17*3+2 = 373 bytes */
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15 static UBYTE rnew[64] , xorres[64] , scale[32] , perm[32] , rl[64] , encpt[64];
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16
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17 /* 64+16+48+64+48+32+64+8*66 = 864 bytes */
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18 static
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19 const UBYTE shtamt[16] = {1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};
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20 static
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21 const UBYTE iporder[64] = {58,50,42,34,26,18,10,2,60,52,44,36,28,20,12,4,62,54,
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22 46,38,30,22,14,6,64,56,48,40,32,24,16,8,57,49,41,33,
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23 25,17,9,1,59,51,43,35,27,19,11,3,61,53,45,37,29,21,
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24 13,5,63,55,47,39,31,23,15,7};
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25 static
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26 const UBYTE pc1[64] = {57,49,41,33,25,17,9,1,58,50,42,34,26,18,10,2,59,51,43,
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27 35,27,19,11,3,60,52,44,36,63,55,47,39,31,23,15,7,62,54,
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28 46,38,30,22,14,6,61,53,45,37,29,21,13,5,28,20,12,4};
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29 static
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30 const UBYTE pc2[48] = {14,17,11,24,1,5,3,28,15,6,21,10,23,19,12,4,26,8,
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31 16,7,27,20,13,2,41,52,31,37,47,55,30,40,51,45,33,
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32 48,44,49,39,56,34,53,46,42,50,36,29,32};
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33 static
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34 const UBYTE e[48] = {32,1,2,3,4,5,4,5,6,7,8,9,8,9,10,11,12,13,12,13,14,15,
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35 16,17,16,17,18,19,20,21,20,21,22,23,24,25,24,25,26,27,
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36 28,29,28, 29,30,31,32,1};
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37 static
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38 const UBYTE sp[32] = {16,7,20,21,29,12,28,17,1,15,23,26,5,18,31,10,
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39 2,8,24,14,32,27,3,9,19,13,30,6,22,11,4,25};
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40 static
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41 const UBYTE ipinv[64] = {40,8,48,16,56,24,64,32,39,7,47,15,55,23,63,31,38,6,46,
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42 14,54,22,62,30,37,5,45,13,53,21,61,29,36,4,44,12,52,
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43 20,60,28,35,3,43,11,51,19,59,27,34,2,42,10,50,18,58,
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44 26,33,1,41,9,49,17,57,25};
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45 static
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46 const UBYTE s[8][66] = {{14,4,13,1,2,15,11,8,3,10,6,12,5,9,0,7,0,15,7,4,14,2,13,
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47 1,10,6,12,11,9,5,3,8,4,1,14,8,13,6,2,11,15,12,9,7,3,10,
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48 5,0,15,12,8,2,4,9,1,7,5,11,3,14,10,0,6,13},
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49 {15,1,8,14,6,11,3,4,9,7,2,13,12,0,5,10,3,13,4,7,15,2,8,
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50 14,12,0,1,10,6,9,11,5,0,14,7,11,10,4,13,1,5,8,12,6,9,3,
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51 2,15,13,8,10,1,3,15,4,2,11,6,7,12,0,5,14,9},
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52 {10,0,9,14,6,3,15,5,1,13,12,7,11,4,2,8,13,7,0,9,3,4,6,
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53 10,2,8,5,14,12,11,15,1,13,6,4,9,8,15,3,0,11,1,2,12,5,
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54 10,14,7,1,10,13,0,6,9,8,7,4,15,14,3,11,5,2,12 },
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55 {7,13,14,3,0,6,9,10,1,2,8,5,11,12,4,15,13,8,11,5,6,15,
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56 0,3,4,7,2,12,1,10,14,9,10,6,9,0,12,11,7,13,15,1,3,14,
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57 5,2,8,4,3,15,0,6,10,1,13,8,9,4,5,11,12,7,2,14 },
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58 {2,12,4,1,7,10,11,6,8,5,3,15,13,0,14,9,14,11,2,12,4,7,
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59 13,1,5,0,15,10,3,9,8,6,4,2,1,11,10,13,7,8,15,9,12,5,6,
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60 3,0,14,11,8,12,7,1,14,2,13,6,15,0,9,10,4,5,3 },
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61 {12,1,10,15,9,2,6,8,0,13,3,4,14,7,5,11,10,15,4,2,7,12,
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62 9,5,6,1,13,14,0,11,3,8,9,14,15,5,2,8,12,3,7,0,4,10,1,
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63 13,11,6,4,3,2,12,9,5,15,10,11,14,1,7,6,0,8,13 },
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64 {4,11,2,14,15,0,8,13,3,12,9,7,5,10,6,1,13,0,11,7,4,9,1,
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65 10,14,3,5,12,2,15,8,6,1,4,11,13,12,3,7,14,10,15,6,8,0,
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66 5,9,2,6,11,13,8,1,4,10,7,9,5,0,15,14,2,3,12 },
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67 {13,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7,1,15,13,8,10,3,7,
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68 4,12,5,6,11,0,14,9,2,7,11,4,1,9,12,14,2,0,6,10,13,15,3,
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69 5,8,2,1,14,7,4,10,8,13,15,12,9,0,3,5,6,11 }};
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70
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71
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72 /*==== FUNCTIONS ==================================================*/
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73
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74 #define LOCAL static
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75
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76 /*
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77 +------------------------------------------------------------------------------
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78 | Function : des_hex2bin4
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79 +------------------------------------------------------------------------------
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80 | Description : The function converts a 4 bit hex value to 4 binary values
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81 |
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82 | Parameters : hex : value in hex
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83 | m : pointer to buffer of 4 elements to store binary values
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84 +------------------------------------------------------------------------------
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85 */
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86 LOCAL void des_hex2bin4(UBYTE hex, UBYTE *m)
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87 {
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88 m[0] = (hex & 0x08) >> 3;
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89 m[1] = (hex & 0x04) >> 2;
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90 m[2] = (hex & 0x02) >> 1;
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91 m[3] = hex & 0x01;
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92 }
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93
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94 /*
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95 +------------------------------------------------------------------------------
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96 | Function : des_hex2bin8
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97 +------------------------------------------------------------------------------
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98 | Description : The function converts a 8 bit hex value to 8 binary values
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99 |
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100 | Parameters : hex : value in hex
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101 | m : pointer to buffer of 8 elements to store binary values
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102 +------------------------------------------------------------------------------
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103 */
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104 LOCAL void des_hex2bin8(UBYTE hex, UBYTE *m)
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105 {
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106 m[0] = (hex & 0x80) >> 7;
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107 m[1] = (hex & 0x40) >> 6;
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108 m[2] = (hex & 0x20) >> 5;
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109 m[3] = (hex & 0x10) >> 4;
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110 m[4] = (hex & 0x08) >> 3;
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111 m[5] = (hex & 0x04) >> 2;
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112 m[6] = (hex & 0x02) >> 1;
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113 m[7] = hex & 0x01;
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114 }
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115
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116 /*
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117 +------------------------------------------------------------------------------
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118 | Function : des_bin2hex
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119 +------------------------------------------------------------------------------
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120 | Description : The function converts 8 bin values to an 8 bit hex value
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121 |
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122 | Parameters : m[8] : input bin values
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123 | Return : converted hex value
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124 +------------------------------------------------------------------------------
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125 */
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126
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127 LOCAL UBYTE des_bin2hex(UBYTE *m)
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128 {
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129 UBYTE hex;
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130 return hex = (m[0]<<7) | (m[1]<<6) | (m[2]<<5) | (m[3]<<4) |
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131 (m[4]<<3) | (m[5]<<2) | (m[6]<<1) | m[7];
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132 }
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133
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134
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135
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136 /*
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137 +------------------------------------------------------------------------------
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138 | Function : des_shift
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139 +------------------------------------------------------------------------------
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140 | Description : The function performs shifting
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141 |
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142 | Parameters : dst : pointer to destination buffer
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143 | src : pointer to source buffer
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144 | sht : shift value
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145 +------------------------------------------------------------------------------
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146 */
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147
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148 LOCAL void des_shift(UBYTE *dst, UBYTE *src, UBYTE sht)
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149 {
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150 UBYTE c1 , c2 , d1 , d2;
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151 int i;
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152
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153 c1 = src[0];
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154 c2 = src[1];
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155 d1 = src[28];
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156 d2 = src[29];
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157
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158 for ( i = 0 ; i < 28 - sht ; i++) {
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159 dst[i] = src[i + sht]; /* copying c[i] */
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160 dst[28 + i] = src[28 + i + sht]; /* copying d[i] */
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161 }
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162
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163 if (sht == 1){
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164 dst[27] = c1;
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165 dst[55] = d1;
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166 } else {
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167 dst[26] = c1;
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168 dst[27] = c2;
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169 dst[54] = d1;
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170 dst[55] = d2;
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171 }
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172 }
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173
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174 /*
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175 +------------------------------------------------------------------------------
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176 | Function : des_indx
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177 +------------------------------------------------------------------------------
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178 | Description : The function generates index for S table
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179 |
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180 | Parameters : m[6] :
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181 | Return : index value
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182 +------------------------------------------------------------------------------
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183 */
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184 LOCAL UBYTE des_indx(UBYTE *m)
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185 {
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186 return( (((m[0]<<1) + m[5])<<4) + ((m[1]<<3) + (m[2]<<2) + (m[3]<<1) + m[4]));
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187 }
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188
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189 /*
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190 +------------------------------------------------------------------------------
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191 | Function : cl_des
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192 +------------------------------------------------------------------------------
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193 | Description : The function performs DES encrypting or decrypting
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194 |
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195 | Parameters : inMsgPtr : pointer to input message M. The length of message
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196 | has to be min. 8 bytes e.g. M = 0123456789abcdef
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197 | desKeyPtr : pointer to DES key. Length has to be 8 bytes
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198 | outMsgPtr : output encrypted/decrypted message. The length is 8 b.
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199 | code : CL_DES_ENCRYPTION, CL_DES_DECRYPTION
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200 +------------------------------------------------------------------------------
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201 */
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202 void cl_des(UBYTE *inMsgPtr, UBYTE *desKeyPtr, UBYTE *outMsgPtr, UBYTE code)
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203 {
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diff changeset
204
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parents:
diff changeset
205 int y , z , g;
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diff changeset
206 UBYTE temp, more;
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207
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208 /*
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209 * convert message from hex to bin format
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210 */
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diff changeset
211 for(y = 0; y < 8; y++){
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diff changeset
212 des_hex2bin8(inMsgPtr[y], &binmsg[8 * y]);
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213 }
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diff changeset
214
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diff changeset
215 /*
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216 * Convert DES key value from hex to bin format
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diff changeset
217 */
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218 for( y = 0; y < 8; y++){
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diff changeset
219 des_hex2bin8(desKeyPtr[y], &binkey[8 * y]);
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220 }
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221
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222 /*
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223 * Step 1: Create 16 subkeys, each of which is 48-bits long.
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diff changeset
224 *
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225 * The 64-bit key is permuted according to the table pc1,
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226 * to get the 56 bit subkey K+. The subkey K+ consists of left
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227 * and right halves C0 and D0, where each half has 28 bits.
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228 */
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229 for(y = 0 ; y < 56 ; y++)
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230 cd[0][y] = binkey[pc1[y] - 1];
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parents:
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231 /*
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232 * Create futher 15 subkeys C1-C16 and D1-D16 by left shifts of
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parents:
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233 * each previous key, i.e. C2 and D2 are obtained from C1 and D1 and so on.
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234 */
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235 for(y = 0 ; y < 16 ; y++)
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236 des_shift(cd[y + 1] , cd[y] , shtamt[y]);
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237
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238 /*
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239 * Form the keys K1-K16 by applying the pc2 permutation
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240 * table to each of the concatenated pairs CnDn.
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241 */
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242 for(y = 0; y < 16; y++){
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243 for(z = 0 ; z < 48 ; z++){
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244 deskey[y][z] = cd[y + 1][pc2[z] - 1];
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245 }
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246 }
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247
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248 /*
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249 * Step 2: Encode each 64-bit block of data
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250 *
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251 * Perform initial permutation IP of th e64 bits the message data M.
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252 * This rearranges the bits according to the iporder table.
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253 */
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254 for(y = 0; y < 64; y++)
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255 ip[y] = binmsg[iporder[y] - 1];
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256
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257 /*
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258 * Divide the permuted block IP into left half L0
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259 * and a right half R0 each of 32 bits.
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260 */
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261 for(y = 0; y < 32; y++){
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262 l[0][y] = ip[y];
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263 r[0][y] = ip[y + 32];
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264 }
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265
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266 /*
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267 * Proceed through 16 iterations, operation on two blocks:
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268 * a data block of 32 bits and a key Kn of 48 bits to produce a block of 32
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269 * bits. This results in a final block L16R16. In each iteration, we take
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270 * the right 32 bits of the previous result and make them the left 32 bits
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271 * of the current step. For the right 32 bits in the current step, we XOR
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272 * the left 32 bits of the previous step.
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273 */
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274 for (y = 0; y < 16; y++){
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275 if (code == CL_DES_ENCRYPTION)/* encryption */
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276 g = y;
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277 else /* decryption */
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278 g = 15 - y;
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279
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280 /*
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281 * Copie the right bits Rn of the current step
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282 * to the left bits Ln+1 of the next step
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283 */
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284 for(z = 0; z < 32; z++)
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285 l[y + 1][z] = r[y][z];
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286
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287 /*
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288 * Expand the block Rn from 32 to 48 bits by using the selection table E.
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289 * Then XOR the result with the key Kn+1.
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290 */
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291 for(z = 0; z < 48; z++){
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292 rnew[z] = r[y][e[z] - 1];
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293 xorres[z] = (rnew[z] ^ deskey[g][z]);
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294 }
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295
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296 /*
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297 * We now have 48 bits, or eight groups of six bits. We use them as
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298 * addresses in tables calle "S boxes". Each group of six bits will
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299 * give us an address in a different S box.
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300 */
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parents:
diff changeset
301 for(z = 0; z < 8; z++){
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302 temp = s[z][des_indx(&xorres[z * 6])];
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303 des_hex2bin4(temp, &scale[z * 4]);
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304 }
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parents:
diff changeset
305
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
306 /*
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parents:
diff changeset
307 * Perform a permutation P of the S box output.
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parents:
diff changeset
308 */
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parents:
diff changeset
309 for(z = 0; z < 32; z++)
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310 perm[z] = scale[sp[z] - 1];
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parents:
diff changeset
311
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parents:
diff changeset
312 /*
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313 * XOR the result with the left half of current step
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parents:
diff changeset
314 * and copie it to the right half of the next step
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parents:
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315 */
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diff changeset
316 for(z = 0; z < 32; z++)
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317 r[y+1][z] = (l[y][z] ^ perm[z]);
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parents:
diff changeset
318 }
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parents:
diff changeset
319
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
320 /*
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parents:
diff changeset
321 * Reserve the order of the final block L16R16 to R16L16
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parents:
diff changeset
322 */
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parents:
diff changeset
323 for( z = 0; z < 32; z++){
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parents:
diff changeset
324 rl[z] = r[16][z];
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parents:
diff changeset
325 rl[z + 32] = l[16][z];
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parents:
diff changeset
326 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
327
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
328 /*
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
329 * Apply the final inverse permutation IP
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
330 */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
331 for( z = 0; z < 64; z++){
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parents:
diff changeset
332 encpt[z] = rl[ipinv[z] - 1];
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parents:
diff changeset
333 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
334
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
335 /*
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
336 * Convert from bin to hex format
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
337 */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
338 for(z = 0; z < 8; z++){
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parents:
diff changeset
339 outMsgPtr[z] = des_bin2hex(&encpt[8 * z]);
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parents:
diff changeset
340 }
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parents:
diff changeset
341 }