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69f8a37be0
The user may specify a delay between PACE nonce requests. Using no delay between subsequent issues of the USB command may lead to errors in the USB communication. Until test results show that the delay can be fixed or left out completely the user has to test what value is safe to use. This fixes errors "Read only 40 instead of requested 64 bytes!" (if the correct delay is used, e.g. 3 seconds for 16 byte nonces).
95 lines
No EOL
2.4 KiB
C
95 lines
No EOL
2.4 KiB
C
//-----------------------------------------------------------------------------
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// Copyright (C) 2012 Frederik Möllers
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//
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// This code is licensed to you under the terms of the GNU GPL, version 2 or,
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// at your option, any later version. See the LICENSE.txt file for the text of
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// the license.
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//-----------------------------------------------------------------------------
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// Commands related to the German electronic Identification Card
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//-----------------------------------------------------------------------------
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#include "util.h"
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#include "proxusb.h"
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#include "ui.h"
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#include "cmdparser.h"
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#include "common.h"
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#include "cmdmain.h"
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#include "cmdhfepa.h"
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static int CmdHelp(const char *Cmd);
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// Perform (part of) the PACE protocol
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int CmdHFEPACollectPACENonces(const char *Cmd)
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{
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// requested nonce size
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uint8_t m = 0;
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// requested number of Nonces
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unsigned int n = 0;
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// delay between requests
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unsigned int d = 0;
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sscanf(Cmd, "%hhu %u %u", &m, &n, &d);
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// values are expected to be > 0
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m = m > 0 ? m : 1;
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n = n > 0 ? n : 1;
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PrintAndLog("Collecting %u %hhu-byte nonces", n, m);
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PrintAndLog("Start: %u", time(NULL));
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// repeat n times
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for (unsigned int i = 0; i < n; i++) {
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// execute PACE
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UsbCommand c = {CMD_EPA_PACE_COLLECT_NONCE, {(int)m, 0, 0}};
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SendCommand(&c);
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UsbCommand *resp = WaitForResponse(CMD_ACK);
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// check if command failed
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if (resp->arg[0] != 0) {
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PrintAndLog("Error in step %d, Return code: %d",
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resp->arg[0],
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(int)resp->arg[1]);
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} else {
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size_t nonce_length = resp->arg[1];
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char *nonce = (char *) malloc(2 * nonce_length + 1);
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for(int j = 0; j < nonce_length; j++) {
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snprintf(nonce + (2 * j), 3, "%02X", resp->d.asBytes[j]);
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}
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// print nonce
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PrintAndLog("Length: %d, Nonce: %s",
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resp->arg[1], nonce);
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}
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if (i < n - 1) {
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sleep(d);
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}
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}
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PrintAndLog("End: %u", time(NULL));
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return 1;
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}
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// UI-related stuff
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static const command_t CommandTable[] =
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{
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{"help", CmdHelp, 1, "This help"},
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{"cnonces", CmdHFEPACollectPACENonces, 0,
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"<m> <n> <d> Acquire n>0 encrypted PACE nonces of size m>0 with d sec pauses"},
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{NULL, NULL, 0, NULL}
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};
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int CmdHelp(const char *Cmd)
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{
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CmdsHelp(CommandTable);
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return 0;
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}
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int CmdHFEPA(const char *Cmd)
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{
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// flush
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while (WaitForResponseTimeout(CMD_ACK, 500) != NULL) ;
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// parse
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CmdsParse(CommandTable, Cmd);
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return 0;
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} |