COSE.MacCommon Maven / Gradle / Ivy

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package COSE;

import com.upokecenter.cbor.CBORObject;
import java.nio.ByteBuffer;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Arrays;
import java.util.Formatter;
import javax.crypto.Cipher;
import javax.crypto.Mac;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;


/**
 *
 * @author jimsch
 */

public abstract class MacCommon extends Message {
    protected byte[] rgbTag;
    protected String strContext;
    protected SecureRandom random = new SecureRandom();
    
    protected MacCommon() {
        super();
    }

    protected void CreateWithKey(byte[] rgbKey) throws CoseException {
        CBORObject algX = findAttribute(CBORObject.FromObject(1)); //HeaderKeys.Algorithm);
        AlgorithmID alg = AlgorithmID.FromCBOR(algX);

        if (rgbContent == null) throw new CoseException("No Content Specified");
        
        switch (alg) {
            case HMAC_SHA_256_64:
            case HMAC_SHA_256:
            case HMAC_SHA_384:
            case HMAC_SHA_512:
                rgbTag = HMAC(alg, rgbKey);
                break;
                
            case AES_CBC_MAC_128_64:
            case AES_CBC_MAC_256_64:
            case AES_CBC_MAC_128_128:
            case AES_CBC_MAC_256_128:
                rgbTag = AES_CBC_MAC(alg, rgbKey);
                break;

            default:
                throw new CoseException("Unsupported MAC Algorithm");
        }
        
        ProcessCounterSignatures();
    }
    
    protected boolean Validate(byte[] rgbKey) throws CoseException {
        boolean f;
        int i;
        byte[] rgbTest;
        
        CBORObject algX = findAttribute(CBORObject.FromObject(1)); //HeaderKeys.Algorithm);
        AlgorithmID alg = AlgorithmID.FromCBOR(algX);
        
        switch (alg) {
            case HMAC_SHA_256_64:
            case HMAC_SHA_256:
            case HMAC_SHA_384:
            case HMAC_SHA_512:
                rgbTest = HMAC(alg, rgbKey);
                break;
                
            case AES_CBC_MAC_128_64:
            case AES_CBC_MAC_256_64:
            case AES_CBC_MAC_128_128:
            case AES_CBC_MAC_256_128:
                rgbTest = AES_CBC_MAC(alg, rgbKey);
                break;
                
            default:
                throw new CoseException("Unsupported MAC Algorithm");
        }
        
        if (rgbTest.length != rgbTag.length) return false;
        f = true;
        for (i=0; i