package sega.a7;

import javacard.framework.JCSystem;
import javacard.framework.Util;
import javacard.security.MessageDigest;

public class MakePacket {
    private byte[] m_ramD_buffer = JCSystem.makeTransientByteArray((short) 20, (byte) 1);

    public boolean setData(byte[] kh, short khOffset, short khLength, short tag,
            short paramSize, short result, short cmd, byte[] data, short dataOffset,
            short dataLength, byte[] nonceEvent, short eventOffset, short eventLength, byte[] nonceOdd,
            short oddOffset, short oddLength, byte[] packet, short packetOffset, short packetLength,
            MessageDigest sha1, HmacSha1 hmacSha1) {
        short ramD_offset = packetOffset;

        if (packet == null || packetLength < paramSize)
            return false;

        if (tag != AppConfig.A7_TAG_RSP_COMMAND) {
            if (tag == AppConfig.A7_TAG_RSP_AUTH_COMMAND || tag == AppConfig.A7_TAG_RSP_RSA_COMMAND) {
                if (nonceEvent == null || nonceOdd == null || hmacSha1 == null)
                    return false;
            } else {
                return false;
            }
        }

        sha1.reset();
        Util.setShort(packet, ramD_offset, tag);
        ramD_offset = (short) (ramD_offset + 2);
        Util.setShort(packet, ramD_offset, paramSize);
        ramD_offset = (short) (ramD_offset + 2);
        Util.setShort(packet, ramD_offset, result);
        ramD_offset = (short) (ramD_offset + 2);
        Util.setShort(this.m_ramD_buffer, (short) 0, cmd);
        if (data == null) {
            sha1.update(packet, packetOffset, (short) (ramD_offset - packetOffset));
            sha1.doFinal(this.m_ramD_buffer, (short) 0, (short) 2, packet, ramD_offset);
        } else {
            sha1.update(packet, packetOffset, (short) (ramD_offset - packetOffset));
            sha1.update(this.m_ramD_buffer, (short) 0, (short) 2);
            Util.arrayCopyNonAtomic(data, dataOffset, packet, ramD_offset, dataLength);
            ramD_offset = (short) (ramD_offset + dataLength);
            sha1.doFinal(data, dataOffset, dataLength, packet, ramD_offset);
        }

        if (tag == AppConfig.A7_TAG_RSP_COMMAND)
            return true;

        Util.arrayCopyNonAtomic(packet, (short) ramD_offset, this.m_ramD_buffer, (short) 0, (short) 20);
        Util.arrayCopyNonAtomic(nonceEvent, (short) eventOffset, packet, (short) ramD_offset, (short) eventLength);
        ramD_offset = (short) ((short) ramD_offset + (short) eventLength);
        hmacSha1.init(kh, (short) khOffset, (short) khLength);
        hmacSha1.update(this.m_ramD_buffer, (short) 0, (short) 20);
        hmacSha1.update(nonceEvent, (short) eventOffset, (short) eventLength);
        hmacSha1.sign(nonceOdd, (short) oddOffset, (short) oddLength, packet, (short) ramD_offset);
        return true;
    }
}