Example usage for org.bouncycastle.crypto.modes.gcm BasicGCMMultiplier BasicGCMMultiplier

Introduction

In this page you can find the example usage for org.bouncycastle.crypto.modes.gcm BasicGCMMultiplier BasicGCMMultiplier.

Prototype

BasicGCMMultiplier

Source Link

Usage

From source file:COSE.EncryptCommon.java

private void AES_GCM_Decrypt(AlgorithmID alg, byte[] rgbKey) throws CoseException, InvalidCipherTextException {
    GCMBlockCipher cipher = new GCMBlockCipher(new AESFastEngine(), new BasicGCMMultiplier());

    CBORObject cn = FindAttribute(HeaderKeys.IV);
    if (cn == null)
        throw new CoseException("Missing IV during decryption");
    if (cn.getType() != CBORType.ByteString)
        throw new CoseException("IV is incorrectly formed");
    if (cn.GetByteString().length != 96 / 8)
        throw new CoseException("IV size is incorrect");

    if (rgbKey.length != alg.getKeySize() / 8)
        throw new CoseException("Missing IV during decryption");
    KeyParameter contentKey = new KeyParameter(rgbKey);
    AEADParameters parameters = new AEADParameters(contentKey, 128, cn.GetByteString(), getAADBytes());

    cipher.init(false, parameters);// w w w.  j  a va  2s.  c  om
    byte[] C = new byte[cipher.getOutputSize(rgbEncrypt.length)];
    int length = cipher.processBytes(rgbEncrypt, 0, rgbEncrypt.length, C, 0);
    length += cipher.doFinal(C, length);

    rgbContent = C;
}

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From source file:COSE.EncryptCommon.java

private void AES_GCM_Encrypt(AlgorithmID alg, byte[] rgbKey)
        throws CoseException, IllegalStateException, InvalidCipherTextException {
    GCMBlockCipher cipher = new GCMBlockCipher(new AESFastEngine(), new BasicGCMMultiplier());

    if (rgbKey.length != alg.getKeySize() / 8)
        throw new CoseException("Key Size is incorrect");
    KeyParameter contentKey = new KeyParameter(rgbKey);

    CBORObject cn = FindAttribute(HeaderKeys.IV);
    byte[] IV;//from  w  ww  .j a v  a2s.c  om

    if (cn == null) {
        IV = new byte[96 / 8];
        random.nextBytes(IV);
        AddUnprotected(HeaderKeys.IV, CBORObject.FromObject(IV));
    } else {
        if (cn.getType() != CBORType.ByteString)
            throw new CoseException("IV is incorrectly formed");
        if (cn.GetByteString().length != 96 / 8)
            throw new CoseException("IV size is incorrect");
        IV = cn.GetByteString();
    }

    AEADParameters parameters = new AEADParameters(contentKey, 128, IV, getAADBytes());

    cipher.init(true, parameters);
    byte[] C = new byte[cipher.getOutputSize(rgbContent.length)];
    int length = cipher.processBytes(rgbContent, 0, rgbContent.length, C, 0);
    length += cipher.doFinal(C, length);

    rgbEncrypt = C;
}

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From source file:org.openmuc.jdlms.internal.security.CipheringGcm.java

License:Open Source License

public static byte[] encrypt(byte[] plaintext, int off, int len, byte[] systemTitle, int frameCounter,
        byte[] encryptionKey, byte[] authenticationKey, byte tag) throws IOException {

    byte[] frameCounterBytes = intToByteArray(frameCounter);

    byte[] iv = concat(systemTitle, frameCounterBytes);

    byte[] associatedData = new byte[authenticationKey.length + 1];
    associatedData[0] = SECURITY_CONTROL_BYTES_AUTH_CIPH;
    System.arraycopy(authenticationKey, 0, associatedData, 1, authenticationKey.length);

    AEADParameters parameters = new AEADParameters(new KeyParameter(encryptionKey), 96, iv, associatedData);

    GCMBlockCipher encCipher = new GCMBlockCipher(new AESFastEngine(), new BasicGCMMultiplier());
    encCipher.init(true, parameters);/*  ww w.j  av  a2 s  .  co m*/

    byte[] enc = new byte[encCipher.getOutputSize(len)];
    int length = encCipher.processBytes(plaintext, off, len, enc, 0);
    try {
        length += encCipher.doFinal(enc, length);
    } catch (IllegalStateException e) {
        throw new IOException("Unable to cipher/encrypt xDLMS pdu", e);
    } catch (InvalidCipherTextException e) {
        throw new IOException("Unable to cipher/encrypt xDLMS pdu", e);
    }

    byte[] result = new byte[enc.length + 7];
    result[0] = tag;
    result[1] = (byte) (enc.length + 5);
    result[2] = SECURITY_CONTROL_BYTES_AUTH_CIPH;
    System.arraycopy(frameCounterBytes, 0, result, 3, 4);
    System.arraycopy(enc, 0, result, 7, enc.length);

    return result;
}

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From source file:org.openmuc.jdlms.internal.security.CipheringGcm.java

License:Open Source License

public static byte[] decrypt(byte[] ciphertext, byte[] systemTitle, byte[] encryptionKey,
        byte[] authenticationKey) throws IOException {

    byte[] iv = new byte[12];
    System.arraycopy(systemTitle, 0, iv, 0, systemTitle.length);
    // copy frame counter
    System.arraycopy(ciphertext, 1, iv, 8, 4);

    byte[] associatedData = new byte[authenticationKey.length + 1];
    associatedData[0] = SECURITY_CONTROL_BYTES_AUTH_CIPH;
    System.arraycopy(authenticationKey, 0, associatedData, 1, authenticationKey.length);

    AEADParameters parameters = new AEADParameters(new KeyParameter(encryptionKey), 96, iv, associatedData);

    GCMBlockCipher decCipher = new GCMBlockCipher(new AESFastEngine(), new BasicGCMMultiplier());
    decCipher.init(false, parameters);/*from   ww  w  . j av a  2s  .  c o  m*/

    byte[] dec = new byte[decCipher.getOutputSize(ciphertext.length - 5)];
    int len = decCipher.processBytes(ciphertext, 5, ciphertext.length - 5, dec, 0);
    try {
        len += decCipher.doFinal(dec, len);
    } catch (IllegalStateException e) {
        throw new IOException("Unable to decipher/decrypt xDLMS pdu", e);
    } catch (InvalidCipherTextException e) {
        throw new IOException("Unable to decipher/decrypt xDLMS pdu", e);
    }

    return dec;
}

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