1 | /*
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2 | apdu.c
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3 | ISO 7816-4 Application Layer PDU's handling
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4 |
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5 | This file is part of the Unix driver for Towitoko smartcard readers
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6 | Copyright (C) 2000 2001 Carlos Prados <cprados@yahoo.com>
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7 |
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8 | This version is modified by doz21 to work in a special manner ;)
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9 |
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10 | This library is free software; you can redistribute it and/or
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11 | modify it under the terms of the GNU Lesser General Public
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12 | License as published by the Free Software Foundation; either
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13 | version 2 of the License, or (at your option) any later version.
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14 |
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15 | This library is distributed in the hope that it will be useful,
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16 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 | Lesser General Public License for more details.
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19 |
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20 | You should have received a copy of the GNU Lesser General Public
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21 | License along with this library; if not, write to the Free Software
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22 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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23 | */
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24 |
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25 | #include "defines.h"
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26 | #include "apdu.h"
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27 | #include <stdlib.h>
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28 | #include <string.h>
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29 |
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30 | /*
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31 | * Not exported constants definiton
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32 | */
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33 |
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34 | #define APDU_MIN_CMD_SIZE 4 /* Min command size */
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35 | #define APDU_MIN_RSP_SIZE 2 /* Min response size */
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36 | #define APDU_CMD_HEADER_SIZE 4 /* Size of the header */
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37 |
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38 | /*
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39 | * Exported functions definition
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40 | */
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41 |
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42 | APDU_Cmd * APDU_Cmd_New (BYTE * data, unsigned long length)
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43 | {
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44 | APDU_Cmd *apdu;
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45 |
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46 | if ((length > APDU_MAX_CMD_SIZE))
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47 | return NULL;
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48 |
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49 | apdu = (APDU_Cmd *) malloc (sizeof (APDU_Cmd));
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50 |
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51 | if (apdu != NULL)
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52 | {
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53 | apdu->length = MAX (APDU_MIN_CMD_SIZE, length);
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54 | apdu->command = (BYTE *) calloc (apdu->length, sizeof (BYTE));
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55 |
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56 | if (apdu->command != NULL)
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57 | {
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58 | memcpy (apdu->command, data, length);
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59 | if (length < apdu->length)
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60 | memset (apdu->command + length, 0, apdu->length - length);
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61 | }
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62 | else
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63 | {
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64 | free (apdu);
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65 | apdu = NULL;
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66 | }
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67 | }
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68 |
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69 | return apdu;
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70 | }
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71 |
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72 | void APDU_Cmd_Delete (APDU_Cmd * apdu)
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73 | {
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74 | free (apdu->command);
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75 | free (apdu);
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76 | }
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77 |
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78 | int APDU_Cmd_Case (APDU_Cmd * apdu)
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79 | {
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80 | BYTE B1;
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81 | unsigned short B2B3;
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82 | unsigned long L;
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83 | int res;
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84 |
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85 | /* Calculate length of body */
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86 | L = MAX(apdu->length - 4, 0);
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87 |
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88 | /* Case 1 */
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89 | if (L == 0)
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90 | {
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91 | res = APDU_CASE_1;
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92 | }
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93 | else
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94 | {
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95 | /* Get first byte of body */
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96 | B1 = apdu->command[4];
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97 |
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98 | if ((B1 != 0) && (L == B1 + 1))
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99 | res = APDU_CASE_2S;
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100 | else if (L == 1)
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101 | res = APDU_CASE_3S;
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102 | else if ((B1 != 0) && (L == B1 + 2))
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103 | res = APDU_CASE_4S;
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104 | else if ((B1 == 0) && (L>2))
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105 | {
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106 | /* Get second and third byte of body */
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107 | B2B3 = (((unsigned short)(apdu->command[5]) << 8) | apdu->command[6]);
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108 |
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109 | if ((B2B3 != 0) && (L == B2B3 + 3))
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110 | res = APDU_CASE_2E;
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111 | else if (L == 3)
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112 | res = APDU_CASE_3E;
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113 | else if ((B2B3 != 0) && (L == B2B3 + 5))
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114 | res = APDU_CASE_4E;
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115 | else
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116 | res = APDU_MALFORMED;
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117 | }
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118 | else
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119 | {
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120 | res = APDU_MALFORMED;
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121 | }
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122 | }
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123 |
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124 | return res;
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125 | }
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126 |
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127 | BYTE APDU_Cmd_Cla (APDU_Cmd * apdu)
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128 | {
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129 | return apdu->command[0];
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130 | }
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131 |
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132 | BYTE APDU_Cmd_Ins (APDU_Cmd * apdu)
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133 | {
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134 | return apdu->command[1];
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135 | }
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136 |
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137 | BYTE APDU_Cmd_P1 (APDU_Cmd * apdu)
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138 | {
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139 | return apdu->command[2];
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140 | }
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141 |
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142 | BYTE APDU_Cmd_P2 (APDU_Cmd * apdu)
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143 | {
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144 | return apdu->command[3];
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145 | }
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146 |
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147 | unsigned long APDU_Cmd_Lc (APDU_Cmd * apdu)
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148 | {
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149 | int c;
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150 | unsigned long res;
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151 |
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152 | c = APDU_Cmd_Case (apdu);
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153 |
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154 | if ((c == APDU_CASE_1) || (c == APDU_CASE_3S) || (c == APDU_CASE_3E))
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155 | res = 0;
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156 | else if ((c == APDU_CASE_2S) || (c == APDU_CASE_4S))
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157 | res = apdu->command[4];
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158 | else if ((c == APDU_CASE_2E) || (c == APDU_CASE_4E))
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159 | res = (((unsigned long)(apdu->command[5]) << 8) | apdu->command[6]);
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160 | else
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161 | res = 0;
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162 |
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163 | return res;
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164 | }
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165 |
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166 | unsigned long APDU_Cmd_Le (APDU_Cmd * apdu)
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167 | {
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168 | int c;
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169 | unsigned long res;
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170 |
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171 | c = APDU_Cmd_Case (apdu);
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172 |
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173 | if ((c == APDU_CASE_1) || (c == APDU_CASE_2S) || (c == APDU_CASE_2E))
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174 | res = 0;
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175 | else if (c == APDU_CASE_3S)
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176 | // res = ((apdu->command[4] == 0) ? 256: apdu->command[4]);
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177 | res = apdu->command[4];
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178 | else if (c == APDU_CASE_4S)
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179 | res = ((apdu->command[apdu->length - 1] == 0) ? 256: apdu->command[apdu->length - 1]);
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180 | else if (c == APDU_CASE_3E)
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181 | res = ((((unsigned long)(apdu->command[5]) << 8) | apdu->command[6]) == 0 ? 65536 : (((unsigned long)(apdu->command[5]) << 8) | apdu->command[6]));
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182 | else if (c == APDU_CASE_4E)
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183 | res = ((((unsigned long)(apdu->command[apdu->length - 2]) << 8) | apdu->command[apdu->length - 1]) == 0 ? 65536 : (((unsigned long)(apdu->command[apdu->length - 2]) << 8) | apdu->command[apdu->length - 1]));
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184 | else
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185 | res = 0;
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186 |
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187 | return res;
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188 | }
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189 |
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190 | bool APDU_Cmd_Le_Available (APDU_Cmd * apdu)
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191 | {
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192 | int c;
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193 | bool res;
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194 |
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195 | c = APDU_Cmd_Case (apdu);
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196 |
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197 | if (c == APDU_CASE_3S)
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198 | res = (apdu->command[4] == 0);
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199 | else if (c == APDU_CASE_4S)
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200 | res = (apdu->command[apdu->length - 1] == 0);
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201 | else if (c == APDU_CASE_3E)
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202 | res = ((((unsigned long)(apdu->command[5]) << 8) | apdu->command[6]) == 0);
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203 | else if (c == APDU_CASE_4E)
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204 | res = ((((unsigned long)(apdu->command[apdu->length - 2]) << 8) | apdu->command[apdu->length - 1]) == 0);
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205 | else
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206 | res = FALSE;
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207 |
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208 | return res;
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209 | }
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210 |
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211 | BYTE * APDU_Cmd_Header (APDU_Cmd * apdu)
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212 | {
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213 | return apdu->command;
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214 | }
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215 |
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216 |
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217 | BYTE * APDU_Cmd_Data (APDU_Cmd * apdu)
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218 | {
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219 | int c;
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220 | BYTE * res;
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221 |
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222 | c = APDU_Cmd_Case (apdu);
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223 |
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224 | if ((c == APDU_CASE_1) || (c == APDU_CASE_3S) || (c == APDU_CASE_3E))
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225 | res = NULL;
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226 | else if ((c == APDU_CASE_2S) || (c == APDU_CASE_4S))
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227 | res = apdu->command + 5;
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228 | else if ((c == APDU_CASE_2E) || (c == APDU_CASE_4E))
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229 | res = apdu->command + 7;
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230 | else
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231 | res = NULL;
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232 |
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233 | return res;
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234 | }
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235 |
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236 | BYTE * APDU_Cmd_Raw (APDU_Cmd * apdu)
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237 | {
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238 | return apdu->command;
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239 | }
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240 |
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241 | unsigned long APDU_Cmd_RawLen (APDU_Cmd * apdu)
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242 | {
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243 | return apdu->length;
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244 | }
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245 |
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246 | APDU_Rsp * APDU_Rsp_New (BYTE * data, unsigned long length)
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247 | {
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248 | APDU_Rsp *apdu;
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249 |
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250 | if (length < APDU_MIN_RSP_SIZE)
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251 | return NULL;
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252 |
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253 | apdu = (APDU_Rsp *) malloc (sizeof (APDU_Rsp));
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254 |
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255 | if (apdu != NULL)
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256 | {
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257 | apdu->length = length;
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258 | apdu->response = (BYTE *) calloc (length, sizeof (BYTE));
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259 |
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260 | if (apdu->response != NULL)
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261 | {
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262 | memcpy (apdu->response, data, length);
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263 | }
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264 | else
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265 | {
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266 | free (apdu);
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267 | apdu = NULL;
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268 | }
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269 | }
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270 |
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271 | return apdu;
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272 | }
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273 |
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274 | void APDU_Rsp_Delete (APDU_Rsp * apdu)
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275 | {
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276 | free (apdu->response);
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277 | free (apdu);
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278 | }
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279 |
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280 | BYTE APDU_Rsp_SW1 (APDU_Rsp * apdu)
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281 | {
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282 | return (apdu->response[(apdu->length) - 2]);
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283 | }
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284 |
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285 | BYTE APDU_Rsp_SW2 (APDU_Rsp * apdu)
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286 | {
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287 | return (apdu->response[(apdu->length) - 1]);
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288 | }
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289 |
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290 | unsigned long
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291 | APDU_Rsp_DataLen (APDU_Rsp * apdu)
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292 | {
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293 | return (apdu->length - 2);
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294 | }
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295 |
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296 | BYTE * APDU_Rsp_Data (APDU_Rsp * apdu)
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297 | {
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298 | return apdu->response;
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299 | }
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300 |
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301 | BYTE * APDU_Rsp_Raw (APDU_Rsp * apdu)
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302 | {
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303 | return apdu->response;
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304 | }
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305 |
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306 | unsigned long APDU_Rsp_RawLen (APDU_Rsp * apdu)
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307 | {
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308 | return apdu->length;
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309 | }
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310 |
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311 | void APDU_Rsp_TruncateData (APDU_Rsp * apdu, unsigned long length)
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312 | {
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313 | if ((length > 0) && ((signed long)length < (signed long)(apdu->length - 2)))
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314 | {
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315 | apdu->response[length] = APDU_Rsp_SW1 (apdu);
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316 | apdu->response[length + 1] = APDU_Rsp_SW2 (apdu);
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317 | apdu->length = length +2;
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318 | }
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319 | }
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320 |
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321 | int APDU_Rsp_AppendData (APDU_Rsp * apdu1, APDU_Rsp * apdu2)
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322 | {
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323 | BYTE * response;
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324 | unsigned long length;
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325 | int ret;
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326 |
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327 | length = APDU_Rsp_DataLen(apdu1) + APDU_Rsp_RawLen(apdu2);
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328 |
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329 | if ((length > 2) && (length <= APDU_MAX_RSP_SIZE))
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330 | {
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331 | response = (BYTE *) realloc (apdu1->response, length);
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332 |
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333 | if (response != NULL)
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334 | {
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335 | memcpy (response + APDU_Rsp_DataLen (apdu1),
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336 | APDU_Rsp_Raw (apdu2), APDU_Rsp_RawLen(apdu2));
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337 |
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338 | apdu1->response = response;
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339 | apdu1->length = length;
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340 | ret = APDU_OK;
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341 | }
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342 | else
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343 | {
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344 | ret = APDU_MALFORMED;
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345 | }
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346 | }
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347 | else
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348 | {
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349 | ret = APDU_MALFORMED;
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350 | }
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351 |
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352 | return ret;
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353 | }
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