Example usage for org.bouncycastle.crypto.modes CCMBlockCipher CCMBlockCipher

Introduction

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

Prototype

public CCMBlockCipher(BlockCipher c) 

Source Link

Document

Basic constructor.

Usage

From source file:COSE.EncryptCommon.java

private void AES_CCM_Decrypt(AlgorithmID alg, byte[] rgbKey)
        throws CoseException, IllegalStateException, InvalidCipherTextException {
    CCMBlockCipher cipher = new CCMBlockCipher(new AESFastEngine());
    KeyParameter ContentKey;/*from  www.  java2 s.c  o m*/
    int cbIV = 0;

    switch (alg) {
    case AES_CCM_16_64_128:
    case AES_CCM_16_64_256:
    case AES_CCM_16_128_128:
    case AES_CCM_16_128_256:
        cbIV = 15 - 2;
        break;

    case AES_CCM_64_64_128:
    case AES_CCM_64_64_256:
    case AES_CCM_64_128_256:
    case AES_CCM_64_128_128:
        cbIV = 15 - 8;
        break;
    }

    //  The requirements from JWA

    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 != cbIV)
        throw new CoseException("IV size is incorrect");

    byte[] IV = cn.GetByteString();

    if (rgbKey.length != alg.getKeySize() / 8)
        throw new CoseException("Missing IV during decryption");
    ContentKey = new KeyParameter(rgbKey);

    //  Build the object to be hashed

    AEADParameters parameters = new AEADParameters(ContentKey, alg.getTagSize(), IV, getAADBytes());

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

    rgbContent = C;
}

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From source file:COSE.EncryptCommon.java

private byte[] AES_CCM_Encrypt(AlgorithmID alg, byte[] rgbKey)
        throws CoseException, IllegalStateException, InvalidCipherTextException {
    CCMBlockCipher cipher = new CCMBlockCipher(new AESFastEngine());
    KeyParameter ContentKey;//from   www.  ja v  a2 s.  c o m
    int cbIV;

    switch (alg) {
    case AES_CCM_16_64_128:
    case AES_CCM_16_64_256:
    case AES_CCM_16_128_128:
    case AES_CCM_16_128_256:
        cbIV = 15 - 2;
        break;

    case AES_CCM_64_64_128:
    case AES_CCM_64_64_256:
    case AES_CCM_64_128_256:
    case AES_CCM_64_128_128:
        cbIV = 15 - 8;
        break;

    default:
        throw new CoseException("Unsupported algorithm: " + alg);
    }

    //  The requirements from JWA

    byte[] IV = new byte[cbIV];
    CBORObject cbor = FindAttribute(HeaderKeys.IV);
    if (cbor != null) {
        if (cbor.getType() != CBORType.ByteString)
            throw new CoseException("IV is incorreclty formed.");
        if (cbor.GetByteString().length > cbIV)
            throw new CoseException("IV is too long.");
        IV = cbor.GetByteString();
    } else {
        random.nextBytes(IV);
        AddUnprotected(HeaderKeys.IV, CBORObject.FromObject(IV));
    }

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

    //  Build the object to be hashed

    AEADParameters parameters = new AEADParameters(ContentKey, alg.getTagSize(), IV, getAADBytes());

    cipher.init(true, parameters);

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

    return C;
}

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From source file:org.cryptacular.spec.AEADBlockCipherSpec.java

License:Open Source License

/**
 * Creates a new AEAD block cipher from the specification in this instance.
 *
 * @return  New AEAD block cipher instance.
 *//*from ww w .j a v  a2s.  c om*/
@Override
public AEADBlockCipher newInstance() {
    final BlockCipher blockCipher = new BlockCipherSpec(algorithm).newInstance();
    AEADBlockCipher aeadBlockCipher;
    switch (mode) {

    case "GCM":
        aeadBlockCipher = new GCMBlockCipher(blockCipher);
        break;

    case "CCM":
        aeadBlockCipher = new CCMBlockCipher(blockCipher);
        break;

    case "OCB":
        aeadBlockCipher = new OCBBlockCipher(blockCipher, new BlockCipherSpec(algorithm).newInstance());
        break;

    case "EAX":
        aeadBlockCipher = new EAXBlockCipher(blockCipher);
        break;

    default:
        throw new IllegalStateException("Unsupported mode " + mode);
    }
    return aeadBlockCipher;
}

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From source file:org.cryptacular.util.CipherUtilTest.java

License:Open Source License

@DataProvider(name = "aead-block-cipher")
public Object[][] getAeadBlockCipherData() {
    return new Object[][] { new Object[] {
            // Plaintext is NOT multiple of block size
            "I never picked cotton like my mother did", new GCMBlockCipher(new AESEngine()), },
            new Object[] {
                    // Plaintext is multiple of block size
                    "Cogito ergo sum.", new GCMBlockCipher(new AESEngine()), },
            // CCM
            new Object[] {
                    "Thousands of candles can be lit from a single candle and the life "
                            + "of the candle will not be shortened.",
                    new CCMBlockCipher(new TwofishEngine()), },
            // OCB
            new Object[] {
                    "I slept and dreamt life was joy. I awoke and saw that life was "
                            + "service. I acted and behold: service was joy.",
                    new OCBBlockCipher(new AESEngine(), new AESEngine()), }, };
}

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