1 | /*
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2 | protocol_t1.c
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3 | Handling of ISO 7816 T=1 protocol
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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 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 <stdio.h>
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27 | #include <stdlib.h>
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28 | #include <string.h>
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29 | #include "protocol_t1.h"
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30 | #include "t1_block.h"
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31 |
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32 | /*
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33 | * Not exported constants definition
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34 | */
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35 | #define PROTOCOL_T1_DEFAULT_IFSC 32
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36 | #define PROTOCOL_T1_DEFAULT_IFSD 32
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37 | #define PROTOCOL_T1_MAX_IFSC 251 /* Cannot send > 255 buffer */
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38 | #define PROTOCOL_T1_DEFAULT_CWI 13
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39 | #define PROTOCOL_T1_DEFAULT_BWI 4
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40 | #define PROTOCOL_T1_EDC_LRC 0
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41 | #define PROTOCOL_T1_EDC_CRC 1
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42 |
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43 | /*
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44 | * Not exported functions declaration
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45 | */
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46 |
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47 | static int
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48 | Protocol_T1_SendBlock (T1_Block * block);
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49 |
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50 | static int
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51 | Protocol_T1_ReceiveBlock (T1_Block ** block);
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52 |
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53 | static int
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54 | Protocol_T1_UpdateBWT (unsigned short bwt);
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55 |
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56 | /*
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57 | * Exproted funtions definition
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58 | */
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59 |
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60 | int
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61 | Protocol_T1_Init (int selected_protocol)
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62 | {
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63 | BYTE ta, tb, tc, cwi, bwi;
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64 | unsigned long baudrate;
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65 | double work_etu;
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66 | int i;
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67 |
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68 | /* Set IFSC */
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69 | if (ATR_GetInterfaceByte (atr, selected_protocol, ATR_INTERFACE_BYTE_TA, &ta) == ATR_NOT_FOUND)
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70 | ifsc = PROTOCOL_T1_DEFAULT_IFSC;
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71 | else if ((ta != 0x00) && (ta != 0xFF))
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72 | ifsc = ta;
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73 | else
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74 | ifsc = PROTOCOL_T1_DEFAULT_IFSC;
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75 |
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76 | /* Towitoko does not allow IFSC > 251 */
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77 | ifsc = MIN (ifsc, PROTOCOL_T1_MAX_IFSC);
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78 |
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79 | /* Set IFSD */
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80 | ifsd = PROTOCOL_T1_DEFAULT_IFSD;
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81 |
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82 | #ifndef PROTOCOL_T1_USE_DEFAULT_TIMINGS
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83 | /* Calculate CWI and BWI */
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84 | if (ATR_GetInterfaceByte (atr, selected_protocol, ATR_INTERFACE_BYTE_TB, &tb) == ATR_NOT_FOUND)
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85 | {
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86 | #endif
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87 | cwi = PROTOCOL_T1_DEFAULT_CWI;
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88 | bwi = PROTOCOL_T1_DEFAULT_BWI;
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89 | #ifndef PROTOCOL_T1_USE_DEFAULT_TIMINGS
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90 | }
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91 | else
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92 | {
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93 | cwi = tb & 0x0F;
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94 | bwi = (tb & 0xF0) >> 4;
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95 | }
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96 | #endif
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97 |
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98 | /* Work etu = (1000 / baudrate) milliseconds */
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99 | ICC_Async_GetBaudrate (&baudrate);
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100 | work_etu = 1000 / (double)baudrate;
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101 |
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102 | /* Set CWT = (2^CWI + 11) work etu */
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103 | cwt = 1;
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104 |
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105 | for (i = 0; i < cwi ; i++)
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106 | cwt *= 2;
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107 |
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108 | cwt = (unsigned short) ((cwt + 11) * work_etu);
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109 |
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110 | /* Set BWT = (2^BWI * 960 + 11) work etu */
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111 | bwt = 1;
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112 | for (i = 0; i < bwi; i++)
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113 | bwt *= 2;
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114 |
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115 | bwt = (unsigned short) ((bwt * 960 + 11) * work_etu);
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116 |
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117 | /* Set BGT = 22 * work etu */
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118 | bgt = (unsigned short) (22 * work_etu);
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119 |
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120 | /* Set the error detection code type */
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121 | if (ATR_GetInterfaceByte (atr, selected_protocol, ATR_INTERFACE_BYTE_TC, &tc) == ATR_NOT_FOUND)
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122 | edc = PROTOCOL_T1_EDC_LRC;
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123 | else
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124 | edc = tc & 0x01;
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125 |
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126 | /* Set initial send sequence (NS) */
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127 | ns = 1;
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128 |
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129 | /* Set timings */
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130 | icc_timings.block_timeout = bwt;
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131 | icc_timings.char_timeout = cwt;
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132 | icc_timings.block_delay = bgt;
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133 | ICC_Async_SetTimings ();
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134 |
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135 | #ifdef DEBUG_PROTOCOL
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136 | printf ("Protocol: T=1: IFSC=%d, IFSD=%d, CWT=%d, BWT=%d, BGT=%d, EDC=%s\n",
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137 | ifsc, ifsd, cwt, bwt, t1->bgt,
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138 | (edc == PROTOCOL_T1_EDC_LRC) ? "LRC" : "CRC");
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139 | #endif
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140 |
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141 | return PROTOCOL_T1_OK;
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142 | }
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143 |
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144 | int
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145 | Protocol_T1_Command (APDU_Cmd * cmd, APDU_Rsp ** rsp)
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146 | {
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147 | T1_Block *block;
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148 | BYTE *buffer, rsp_type, bytes, nr, wtx;
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149 | unsigned short counter;
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150 | int ret;
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151 | bool more;
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152 | if (APDU_Cmd_Ins(cmd) == T1_BLOCK_S_IFS_REQ)
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153 | {
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154 | BYTE inf = APDU_Cmd_P2(cmd);
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155 |
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156 | /* Create an IFS request S-Block */
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157 | block = T1_Block_NewSBlock (T1_BLOCK_S_IFS_REQ, 1, &inf);
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158 |
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159 | #ifdef DEBUG_PROTOCOL
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160 | printf ("Protocol: Sending block S(IFS request, %d)\n", inf);
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161 | #endif
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162 | /* Send IFSD request */
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163 | ret = Protocol_T1_SendBlock (block);
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164 |
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165 | /* Delete block */
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166 | T1_Block_Delete (block);
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167 |
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168 | /* Receive a block */
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169 | ret = Protocol_T1_ReceiveBlock (&block);
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170 |
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171 | if (ret == PROTOCOL_T1_OK)
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172 | {
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173 | rsp_type = T1_Block_GetType (block);
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174 |
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175 | /* Positive IFS Response S-Block received */
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176 | if (rsp_type == T1_BLOCK_S_IFS_RES)
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177 | {
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178 | /* Update IFSD value */
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179 | inf = (*T1_Block_GetInf (block));
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180 | ifsd = inf;
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181 | #ifdef DEBUG_PROTOCOL
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182 | printf ("Protocol: Received block S(IFS response, %d)\n", inf);
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183 | #endif
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184 | }
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185 | }
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186 |
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187 | return ret;
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188 | }
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189 |
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190 | /* Calculate the number of bytes to send */
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191 | counter = 0;
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192 | bytes = MIN (APDU_Cmd_RawLen (cmd), ifsc);
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193 |
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194 | /* See if chaining is needed */
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195 | more = (APDU_Cmd_RawLen (cmd) > ifsc);
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196 |
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197 | /* Increment ns */
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198 | ns = (ns + 1) %2;
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199 |
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200 | /* Create an I-Block */
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201 | block = T1_Block_NewIBlock (bytes, APDU_Cmd_Raw (cmd), ns, more);
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202 |
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203 | #ifdef DEBUG_PROTOCOL
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204 | printf ("Sending block I(%d,%d)\n", ns, more);
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205 | #endif
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206 |
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207 | /* Send a block */
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208 | ret = Protocol_T1_SendBlock (block);
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209 |
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210 | /* Delete I-block */
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211 | T1_Block_Delete (block);
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212 |
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213 | while ((ret == PROTOCOL_T1_OK) && more)
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214 | {
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215 | /* Receive a block */
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216 | ret = Protocol_T1_ReceiveBlock (&block);
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217 |
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218 | if (ret == PROTOCOL_T1_OK)
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219 | {
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220 | rsp_type = T1_Block_GetType (block);
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221 |
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222 | /* Positive ACK R-Block received */
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223 | if (rsp_type == T1_BLOCK_R_OK)
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224 | {
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225 | #ifdef DEBUG_PROTOCOL
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226 | printf ("Protocol: Received block R(%d)\n", T1_Block_GetNR (block));
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227 | #endif
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228 | /* Delete block */
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229 | T1_Block_Delete (block);
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230 |
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231 | /* Increment ns */
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232 | ns = (ns + 1) % 2;
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233 |
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234 | /* Calculate the number of bytes to send */
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235 | counter += bytes;
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236 | bytes = MIN (APDU_Cmd_RawLen (cmd) - counter, ifsc);
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237 |
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238 | /* See if chaining is needed */
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239 | more = (APDU_Cmd_RawLen (cmd) - counter > ifsc);
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240 |
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241 | /* Create an I-Block */
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242 | block =
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243 | T1_Block_NewIBlock (bytes, APDU_Cmd_Raw (cmd) + counter,
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244 | ns, more);
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245 | #ifdef DEBUG_PROTOCOL
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246 | printf ("Protocol: Sending block I(%d,%d)\n", ns, more);
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247 | #endif
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248 | /* Send a block */
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249 | ret = Protocol_T1_SendBlock (block);
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250 |
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251 | /* Delete I-block */
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252 | T1_Block_Delete (block);
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253 | }
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254 |
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255 | else
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256 | {
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257 | /* Delete block */
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258 | T1_Block_Delete (block);
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259 |
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260 | ret = PROTOCOL_T1_NOT_IMPLEMENTED;
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261 | }
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262 | }
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263 |
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264 | else
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265 | {
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266 | ret = PROTOCOL_T1_NOT_IMPLEMENTED;
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267 | }
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268 | }
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269 |
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270 | /* Reset counter */
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271 | buffer = NULL;
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272 | counter = 0;
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273 | more = TRUE;
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274 | wtx = 0;
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275 |
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276 | while ((ret == PROTOCOL_T1_OK) && more)
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277 | {
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278 | if (wtx > 1)
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279 | Protocol_T1_UpdateBWT (wtx * (bwt));
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280 |
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281 | /* Receive a block */
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282 | ret = Protocol_T1_ReceiveBlock (&block);
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283 |
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284 | if (wtx > 1)
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285 | {
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286 | Protocol_T1_UpdateBWT (bwt);
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287 | wtx = 0;
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288 | }
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289 |
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290 | if (ret == PROTOCOL_T1_OK)
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291 | {
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292 | rsp_type = T1_Block_GetType (block);
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293 |
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294 | if (rsp_type == T1_BLOCK_I)
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295 | {
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296 | #ifdef DEBUG_PROTOCOL
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297 | printf ("Protocol: Received block I(%d,%d)\n",
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298 | T1_Block_GetNS(block), T1_Block_GetMore (block));
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299 | #endif
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300 | /* Calculate nr */
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301 | nr = (T1_Block_GetNS (block) + 1) % 2;
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302 |
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303 | /* Save inf field */
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304 | bytes = T1_Block_GetLen (block);
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305 | buffer = (BYTE *) realloc(buffer, counter + bytes);
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306 | memcpy (buffer + counter, T1_Block_GetInf (block), bytes);
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307 | counter += bytes;
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308 |
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309 | /* See if chaining is requested */
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310 | more = T1_Block_GetMore (block);
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311 |
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312 | /* Delete block */
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313 | T1_Block_Delete (block);
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314 |
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315 | if (more)
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316 | {
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317 | /* Create an R-Block */
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318 | block = T1_Block_NewRBlock (T1_BLOCK_R_OK, nr);
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319 | #ifdef DEBUG_PROTOCOL
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320 | printf ("Protocol: Sending block R(%d)\n", nr);
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321 | #endif
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322 | /* Send R-Block */
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323 | ret = Protocol_T1_SendBlock (block);
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324 |
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325 | /* Delete I-block */
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326 | T1_Block_Delete (block);
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327 | }
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328 | }
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329 |
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330 | /* WTX Request S-Block received */
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331 | else if (rsp_type == T1_BLOCK_S_WTX_REQ)
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332 | {
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333 | /* Get wtx multiplier */
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334 | wtx = (*T1_Block_GetInf (block));
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335 | #ifdef DEBUG_PROTOCOL
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336 | printf ("Protocol: Received block S(WTX request, %d)\n", wtx);
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337 | #endif
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338 | /* Delete block */
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339 | T1_Block_Delete (block);
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340 |
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341 | /* Create an WTX response S-Block */
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342 | block = T1_Block_NewSBlock (T1_BLOCK_S_WTX_RES, 1, &wtx);
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343 | #ifdef DEBUG_PROTOCOL
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344 | printf ("Protocol: Sending block S(WTX response, %d)\n", wtx);
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345 | #endif
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346 | /* Send WTX response */
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347 | ret = Protocol_T1_SendBlock (block);
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348 |
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349 | /* Delete block */
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350 | T1_Block_Delete (block);
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351 | }
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352 |
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353 | else
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354 | {
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355 | ret = PROTOCOL_T1_NOT_IMPLEMENTED;
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356 | }
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357 | }
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358 | }
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359 |
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360 | if (ret == PROTOCOL_T1_OK)
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361 | (*rsp) = APDU_Rsp_New (buffer, counter);
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362 |
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363 | if (buffer != NULL)
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364 | free (buffer);
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365 |
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366 | return ret;
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367 | }
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368 |
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369 | /*
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370 | * Not exported functions definition
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371 | */
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372 |
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373 | static int
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374 | Protocol_T1_SendBlock (T1_Block * block)
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375 | {
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376 | BYTE *buffer;
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377 | int length, ret;
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378 |
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379 | {
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380 | /* Send T=1 block */
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381 | buffer = T1_Block_Raw (block);
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382 | length = T1_Block_RawLen (block);
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383 |
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384 | if (ICC_Async_Transmit (length, buffer) != ICC_ASYNC_OK)
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385 | {
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386 | ret = PROTOCOL_T1_ICC_ERROR;
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387 | }
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388 |
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389 | else
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390 | ret = PROTOCOL_T1_OK;
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391 | }
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392 |
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393 | return ret;
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394 | }
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395 |
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396 | static int
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397 | Protocol_T1_ReceiveBlock (T1_Block ** block)
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398 | {
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399 | BYTE buffer[T1_BLOCK_MAX_SIZE];
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400 | int ret;
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401 |
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402 | /* Receive four mandatory bytes */
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403 | if (ICC_Async_Receive (4, buffer) != ICC_ASYNC_OK)
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404 | {
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405 | ret = PROTOCOL_T1_ICC_ERROR;
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406 | (*block) = NULL;
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407 | }
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408 |
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409 | else
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410 | {
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411 | if (buffer[2] != 0x00)
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412 | {
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413 | /* Set timings to read the remaining block */
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414 | Protocol_T1_UpdateBWT (cwt);
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415 |
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416 | /* Receive remaining bytes */
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417 | if (ICC_Async_Receive (buffer[2], buffer + 4) !=
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418 | ICC_ASYNC_OK)
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419 | {
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420 | (*block) = NULL;
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421 | ret = PROTOCOL_T1_ICC_ERROR;
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422 | }
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423 |
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424 | else
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425 | {
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426 | (*block) = T1_Block_New (buffer, buffer[2] + 4);
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427 | ret = PROTOCOL_T1_OK;
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428 | }
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429 |
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430 | /* Restore timings */
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431 | Protocol_T1_UpdateBWT (bwt);
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432 | }
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433 | else
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434 | {
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435 | ret = PROTOCOL_T1_OK;
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436 | (*block) = T1_Block_New (buffer, 4);
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437 | }
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438 | }
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439 |
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440 | return ret;
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441 | }
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442 |
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443 | static int
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444 | Protocol_T1_UpdateBWT (unsigned short bwt)
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445 | {
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446 | icc_timings.block_timeout = bwt;
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447 | ICC_Async_SetTimings ();
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448 |
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449 | return PROTOCOL_T1_OK;
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450 | }
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