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bfsearch-booty: bfsearch captures from GR2 and SJA2 cards
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 28 Feb 2021 21:22:59 +0000
parents 01aed8d0685a
children cc6a4b48dc2a
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1 fc-simtool is a tool built from the bottom up: at the foundation there is a set
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2 of low-level commands that provide raw access to the actual SIM protocol APDU
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3 commands, these low-level commands can be used to do everything that the SIM
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4 protocol allows, and all higher-level commands merely provide user-friendly
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5 utilities for the most common particular use cases. This document describes
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6 these low-level commands. Readers of this document are expected to know the
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7 SIM interface protocol as defined in GSM TS 11.11 and its successor 3GPP TS
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8 51.011.
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9
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10 Exploring and reading commands
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11 ==============================
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12
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13 atr
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14
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15 This command displays the ATR (Answer To Reset) byte string which the SIM sent
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16 to the reader when it powered up.
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17
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Mychaela Falconia <falcon@freecalypso.org>
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18 select File_ID
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19
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20 This fc-simtool command sends a SELECT command to the SIM, follows up with a
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21 GET RESPONSE command as expected in the T=0 protocol, and provides some human-
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22 readable parsing of the most important fields in the SIM response structure.
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23 If a correctly formed response was received from the SIM and this response
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24 structure indicates that a record-based EF has been selected, the indicated
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25 record length is saved in an internal variable used by readrec and update-rec
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26 commands.
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27
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28 The file ID can be specified either in hexadecimal (exactly 4 hex digits, *no*
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29 0x prefix) or as a symbolic name. fc-simtool knows the following symbolic
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30 names:
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31
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32 * MF
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33 * DF_GSM, DF_DCS1800 and DF_TELECOM
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34 * "gsm" and "telecom" as shorthand names for DF_GSM and DF_TELECOM
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35 * Some of the most classic EFs, but not all
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36
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37 Important note: regardless of whether you specify the file ID in raw hex or
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38 symbolically, this low-level select command will send only one SELECT command
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39 to the SIM. Per the SIM protocol, in order to successfully select an EF, you
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40 have to be in the right directory first, i.e., select MF, DF_GSM or DF_TELECOM
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41 as appropriate before the EF of interest. Our low-level select command does
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42 NOT do this extra step on its own, you have to do it explicitly, even if you
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43 use symbolic names for EFs.
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44
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45 sim-resp
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46
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47 This command displays in raw hex the content of the internal buffer that holds
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48 the last response received from the SIM. This internal buffer is filled by the
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49 GET RESPONSE command that follows up after SELECT or RUN GSM ALGORITHM, and by
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50 the READ BINARY or READ RECORD commands, whether they are invoked directly as
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51 low-level commands (select, readbin, readrec or a38) or internally as part of
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52 higher-level fc-simtool commands.
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53
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54 readbin offset len
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56 This fc-simtool command sends a READ BINARY command to the SIM and displays the
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57 SIM response in raw hex, internally invoking the same function as sim-resp.
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58 The two arguments are exactly as in the READ BINARY protocol command; each
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59 number is interpreted as decimal by default or as hex if preceded by 0x.
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60
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61 readrec record-index [len]
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62
91
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63 This fc-simtool command sends a READ RECORD command to the SIM (absolute
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64 addressing mode) and displays the SIM response in raw hex, internally invoking
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65 the same function as sim-resp. The arguments are decimal or hex as in the
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66 readbin command.
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67
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68 If no explicit length argument is given, readrec uses the internal variable set
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69 by the last select operation. This one-argument form is almost always used in
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70 practice, as the SIM will normally reject any requested length that does not
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71 match the current EF record length.
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72
92
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73 readef File_ID
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74
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75 This fc-simtool command provides a slightly higher-level facility for examining
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76 the content of transparent EFs, combining select and readbin operations. The
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77 sole File_ID argument is the same as for the low-level select command; if the
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78 SIM response to this SELECT indicates a transparent EF (it is an error
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79 otherwise), readef follows up with a READ BINARY command to read the entire file
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80 (or the first 256 bytes if the file is longer) and displays the read content in
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81 raw hex.
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82
93
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83 Just like with the low-level select command, there is no built-in MF/DF
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84 selection.
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85
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86 savebin File_ID out-bin-file
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87
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88 This command selects the specified EF (just like with low-level select and
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89 readef, you need to be in the right MF/DF directory) and saves its complete
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90 content in a raw binary file on the UNIX host file system. This command
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91 supports all 3 types of EF (transparent, linear fixed and cyclic) and uses the
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92 correct READ BINARY or READ RECORD commands based on the SELECT response.
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93 Record-based EFs are read in the order of increasing record number and are saved
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94 in the host binary file with all records simply abutted together.
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95
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96 Writing commands
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97 ================
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98
94
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99 update-bin offset hexfile
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100
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101 This fc-simtool command reads a hex data file (an ASCII text file containing
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102 only hex byte values and nothing else, with or without white space between
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103 bytes, newlines treated as any other white space) and sends this byte content
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104 to the SIM in an UPDATE BINARY command. The offset argument is the same as in
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105 the readbin command. The length is the number of bytes read from the hex data
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106 file.
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107
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108 update-bin-imm offset hex-string
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109
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110 This command works like update-bin, but the bytes to be written are given as a
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111 hex string direct argument (like an immediate operand in assembly languages),
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112 rather than via a hex data file.
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113
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114 update-rec record-index hexfile
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115
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116 This fc-simtool command reads a hex data file (just like update-bin) and sends
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117 this byte content to the SIM in an UPDATE RECORD command, using absolute
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118 addressing mode. The record-index argument is the same as in the readrec
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119 command. The number of bytes in the hex data file must equal the EF record
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120 length.
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121
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122 update-rec-prev hexfile
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123
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124 This fc-simtool command is like update-rec, but the UPDATE RECORD command sent
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125 to the SIM uses the PREVIOUS addressing mode, and there is no record number.
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126 This form is needed in order to write to cyclic EFs.
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127
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128 restore-file File_ID host-bin-file
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129
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130 This command restores a binary backup previously made with savebin back to the
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131 SIM, or writes new bits into the EF if you can construct the necessary binary
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132 image with tools like xxd. The arguments are the same as for the savebin
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133 command. This command supports all 3 types of EF (transparent, linear fixed
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134 and cyclic) and uses the correct UPDATE BINARY or UPDATE RECORD commands based
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135 on the SELECT response. Cyclic files are restored by writing every record in
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136 the reverse order from the last index to the first.
75
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137
127
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138 INVALIDATE and REHABILITATE
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139 ===========================
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140
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141 cur-ef-inval will send an INVALIDATE command to the SIM; cur-ef-rehab will send
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142 a REHABILITATE command. The naming of these low-level fc-simtool commands
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143 reflects the fact that you have to manually select the EF of interest first.
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144
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145 GSM authentication testing
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146 ==========================
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147
96
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148 a38 RAND
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149
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150 This fc-simtool command exercises the SIM card's RUN GSM ALGORITHM command.
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151 The user-specified RAND value (a hex string of 16 bytes) is sent to the SIM,
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152 and the SIM response is parsed to display SRES and Kc.
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153
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154 Per SIM specs GSM TS 11.11 and 3GPP TS 51.011, RUN GSM ALGORITHM can only be
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155 executed when DF_GSM is selected. fc-simtool a38 command does NOT include a
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156 built-in SELECT of DF_GSM, hence you need to manually issue 'select DF_GSM'
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157 first.
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158
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159 This a38 command can be used to verify if the SIM card's Ki and A38 algorithm
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160 match what you expect them to be. To perform this test, issue an a38 command
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161 to the SIM with some made-up RAND and note the SRES and Kc response. Then use
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162 the osmo-auc-gen utility from Osmocom to run the expected algorithm with the
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163 expected Ki (and the expected OPc if MILENAGE is used) and the same RAND, and
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164 see if SRES and Kc match.
128
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165
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166 Exploring proprietary APDUs
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167 ===========================
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168
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169 If the SIM you are working with is known or suspected to implement some
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170 non-standard or proprietary APDUs for which there is no explicit support in
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171 fc-simtool, you can use this low-level debug command to send arbitrary APDUs:
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172
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173 apdu "xx xx xx xx xx ..."
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174
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175 The sole argument is a raw string of bytes (quotes are needed if there are
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176 spaces between bytes), and the APDU needs to be given exactly as it is sent in
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177 the T=0 protocol: 5 bytes of header (including the length byte) followed by
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178 data bytes, if any. After executing the APDU exchange, the apdu command simply
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179 prints the SW response code from the SIM.