hpkaushik121

// app/build.gradle

dependencies {
    // ... other dependencies

    implementation project(':module1')
    implementation project(':module2')
}

// Define module priorities

hpkaushik121

        /**
         * p1 &= 0b00111111 = AAC = reject transaction (EMVApplication Authentication Cryptogram)
         * p1 &= 0b10111111 = TC = proceed offline (Transaction Certificate)
         * p1 &= 0b01111111 = ARQC = go online (Authorization Request Cryptogram                                                                            ) +
         * 0x00 = CDA signature not requested
         * 0x10 = CDA signature requested
         */
        ByteArrayOutputStream buf = new ByteArrayOutputStream();
        byte[] authorizedAmount = Util.fromHexString("00 00 00 00 01 00"); // 1 Rs
        byte[] secondaryAmount = Util.fromHexString("00 00 00 00 00 00");  // 0 Rs

hpkaushik121

77 4e -- Response Message Template Format 2
    82 02 -- Application Interchange Profile
          00 00 (BINARY)
    9f 36 02 -- Application Transaction Counter (ATC)
             00 01 (BINARY)
    57 13 -- Track 2 Equivalent Data
          40 23 60 09 00 12 50 08 d1 80 52 21 15 15 29 93
          00 00 0f (BINARY)
    9f 10 07 -- Issuer Application Data
             06 0a 0a 03 a0 00 00 (BINARY)

hpkaushik121

/**
     * The VERIFY command is used for OFFLINE authentication.
     * The Transaction PIN Data (input) is compared with the Reference PIN Data
     * stored in the application (ICC).
     *
     * NOTE: The EMV command "Offline PIN" (plaintext) is vulnerable to a Man-in-the-middle attack.
     * Terminals should request online pin verification instead (or encipher PIN) !!
     *
     * Case 3 C-APDU
     *

hpkaushik121

public class Main {
    public static byte[] externalAuthenticate(byte[] cryptogram, byte[] proprietaryBytes) {
        if (cryptogram == null) {
            throw new IllegalArgumentException("Argument 'cryptogram' cannot be null");
        }
        if (cryptogram.length != 8) {
            throw new IllegalArgumentException("Argument 'cryptogram' must have a length of 8. length=" + cryptogram.length);
        }
        if (proprietaryBytes != null && (proprietaryBytes.length < 1 || proprietaryBytes.length > 8)) {

hpkaushik121

6f 37
84 07 //AID
      a0 00 00 00 03 10 10
a5 2c
      50 04 //Application Label (= VISA)
            56 49 53 41
      87 01 //Application priority indicator
            02
      9f 38 06 //PDOL
               9f 1a

hpkaushik121

/*
     *
     * Case 4s C-APDU
     */
    public static byte[] getProcessingOpts(DOL pdol, EMVApplication app) {
        String command;
        if (pdol != null && pdol.getTagAndLengthList().size() > 0) {
            byte[] pdolResponseData = EMVTerminal.constructDOLResponse(pdol, app);
            command = "80 A8 00 00";
            command += " " + Util.int2Hex(pdolResponseData.length + 2) + " 83 " + Util.int2Hex(pdolResponseData.length); //this PDOL get be fetch from response of SELECT command

hpkaushik121

public static byte[] readRecord(int recordNum, int sfi) {
        //Valid Record numbers: 1 to 255
        //Valid SFI: 1 to 30
        //SFI=0 : Currently selected EF
        if (recordNum < 1 || recordNum > 255) {
            throw new IllegalArgumentException("Argument 'recordNum' must be in the rage 1 to 255. recordNum=" + recordNum);
        }
        if (sfi < 0 || sfi > 30) {
            throw new IllegalArgumentException("Argument 'sfi' must be in the rage 1 to 30. Use 0 for currently selected EF. sfi=" + sfi);
        }

hpkaushik121

 6f 20 //FCI(File Control Information) Template
      84 0e //DF Name
            31 50 41 59 2e 53 59 53 2e 44 44 46 30 31 (=1PAY.SYS.DDF01)
      a5 0e //FCI Proprietary Template
            88 01 //SFI(Short Field Identifier ) of the Directory Elementary File
                  02
            5f 2d 04 //Language Preference
                     6e 6f 65 6e
            9f 11 01 //Issuer Code Table Index
                     01 (=ISO 8859-1)

hpkaushik121

70 23 //EMV Proprietary Template
     61 21 // Application Template
            4f 07 //AID
                  a0 00 00 00 03 10 10
            50 04 //Application Label
                  56 49 53 41 (=VISA)
            9f 12 0c //Application Preferred Name
                     56 49 53 41 20 43 6c 61 73 73 69 63 (=VISA Classic)
            87 01 //Application priority indicator
                  02