87 lines
2.6 KiB
C
87 lines
2.6 KiB
C
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#include "mifare.h"
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#include <string.h>
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#include <nfc/nfc.h>
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/**
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* @brief Execute a MIFARE Classic Command
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* @return Returns true if action was successfully performed; otherwise returns false.
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* @param pmp Some commands need additional information. This information should be supplied in the mifare_param union.
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*
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* The specified MIFARE command will be executed on the tag. There are different commands possible, they all require the destination block number.
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* @note There are three different types of information (Authenticate, Data and Value).
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*
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* First an authentication must take place using Key A or B. It requires a 48 bit Key (6 bytes) and the UID.
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* They are both used to initialize the internal cipher-state of the PN53X chip (http://libnfc.org/hardware/pn53x-chip).
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* After a successful authentication it will be possible to execute other commands (e.g. Read/Write).
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* The MIFARE Classic Specification (http://www.nxp.com/acrobat/other/identification/M001053_MF1ICS50_rev5_3.pdf) explains more about this process.
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*/
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bool
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nfc_initiator_mifare_cmd (nfc_device_t * pnd, const mifare_cmd mc, const uint8_t ui8Block, mifare_param * pmp)
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{
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byte_t abtRx[265];
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size_t szRxLen;
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size_t szParamLen;
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byte_t abtCmd[265];
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// Make sure we are dealing with a active device
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if (!pnd->bActive)
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return false;
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abtCmd[0] = mc; // The MIFARE Classic command
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abtCmd[1] = ui8Block; // The block address (1K=0x00..0x39, 4K=0x00..0xff)
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switch (mc) {
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// Read and store command have no parameter
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case MC_READ:
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case MC_STORE:
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szParamLen = 0;
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break;
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// Authenticate command
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case MC_AUTH_A:
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case MC_AUTH_B:
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szParamLen = sizeof (mifare_param_auth);
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break;
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// Data command
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case MC_WRITE:
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szParamLen = sizeof (mifare_param_data);
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break;
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// Value command
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case MC_DECREMENT:
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case MC_INCREMENT:
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case MC_TRANSFER:
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szParamLen = sizeof (mifare_param_value);
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break;
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// Please fix your code, you never should reach this statement
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default:
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return false;
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break;
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}
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// When available, copy the parameter bytes
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if (szParamLen)
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memcpy (abtCmd + 2, (byte_t *) pmp, szParamLen);
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// Fire the mifare command
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if (!nfc_initiator_transceive_bytes (pnd, abtCmd, 2 + szParamLen, abtRx, &szRxLen)) {
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if (pnd->iLastError != 0x14)
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nfc_perror (pnd, "nfc_initiator_transceive_bytes");
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return false;
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}
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// When we have executed a read command, copy the received bytes into the param
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if (mc == MC_READ) {
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if (szRxLen == 16) {
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memcpy (pmp->mpd.abtData, abtRx, 16);
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} else {
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return false;
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}
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}
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// Command succesfully executed
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return true;
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}
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