81 lines
2.7 KiB
C
81 lines
2.7 KiB
C
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#include "mifare.h"
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#include <string.h>
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#include "chips/pn53x.h"
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extern const byte_t pncmd_initiator_exchange_data [265];
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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 nfc_initiator_mifare_cmd(const 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[MAX_FRAME_LEN];
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size_t szRxLen;
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size_t szParamLen;
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byte_t abtCmd[sizeof(pncmd_initiator_exchange_data)];
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memcpy(abtCmd,pncmd_initiator_exchange_data,sizeof(pncmd_initiator_exchange_data));
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// Make sure we are dealing with a active device
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if (!pnd->bActive) return false;
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abtCmd[2] = 0x01; // Use first target/card
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abtCmd[3] = mc; // The MIFARE Classic command
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abtCmd[4] = ui8Block; // The block address (1K=0x00..0x39, 4K=0x00..0xff)
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switch (mc)
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{
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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) memcpy(abtCmd+5,(byte_t*)pmp,szParamLen);
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// Fire the mifare command
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if (!pn53x_transceive(pnd,abtCmd,5+szParamLen,abtRx,&szRxLen)) return false;
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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 && szRxLen == 17) memcpy(pmp->mpd.abtData,abtRx+1,16);
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// Command succesfully executed
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return true;
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}
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