Example usage for org.bouncycastle.crypto AsymmetricBlockCipher getOutputBlockSize

Introduction

In this page you can find the example usage for org.bouncycastle.crypto AsymmetricBlockCipher getOutputBlockSize.

Prototype

public int getOutputBlockSize();

Source Link

Document

returns the maximum size of the block produced by this cipher.

Usage

From source file:dorkbox.util.crypto.CryptoRSA.java

License:Apache License

/**
 * RSA encrypts data with a specified key.
 *
 * @param logger/*from ww  w. j  a v  a 2s  .c o  m*/
 *                 may be null, if no log output is necessary
 *
 * @return empty byte[] if error
 */
public static byte[] encrypt(AsymmetricBlockCipher rsaEngine, RSAKeyParameters rsaPublicKey, byte[] bytes,
        Logger logger) {
    rsaEngine.init(true, rsaPublicKey);

    try {
        int inputBlockSize = rsaEngine.getInputBlockSize();
        if (inputBlockSize < bytes.length) {
            int outSize = rsaEngine.getOutputBlockSize();
            //noinspection NumericCastThatLosesPrecision
            int realsize = (int) Math.round(bytes.length / (outSize * 1.0D) + 0.5);
            ByteBuffer buffer = ByteBuffer.allocateDirect(outSize * realsize);

            int position = 0;

            while (position < bytes.length) {
                int size = Math.min(inputBlockSize, bytes.length - position);

                byte[] block = rsaEngine.processBlock(bytes, position, size);
                buffer.put(block, 0, block.length);

                position += size;
            }

            return buffer.array();

        } else {
            return rsaEngine.processBlock(bytes, 0, bytes.length);
        }
    } catch (Exception e) {
        if (logger != null) {
            logger.error("Unable to perform RSA cipher.", e);
        }
        return new byte[0];
    }
}

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From source file:dorkbox.util.crypto.CryptoRSA.java

License:Apache License

/**
 * RSA decrypt data with a specified key.
 *
 * @param logger/*from w ww.j  a  v  a  2 s. co  m*/
 *                 may be null, if no log output is necessary
 *
 * @return empty byte[] if error
 */
public static byte[] decrypt(AsymmetricBlockCipher rsaEngine, RSAPrivateCrtKeyParameters rsaPrivateKey,
        byte[] bytes, Logger logger) {
    rsaEngine.init(false, rsaPrivateKey);

    try {
        int inputBlockSize = rsaEngine.getInputBlockSize();
        if (inputBlockSize < bytes.length) {
            int outSize = rsaEngine.getOutputBlockSize();
            //noinspection NumericCastThatLosesPrecision
            int realsize = (int) Math.round(bytes.length / (outSize * 1.0D) + 0.5);
            ByteArrayOutputStream buffer = new ByteArrayOutputStream(outSize * realsize);

            int position = 0;

            while (position < bytes.length) {
                int size = Math.min(inputBlockSize, bytes.length - position);

                byte[] block = rsaEngine.processBlock(bytes, position, size);
                buffer.write(block, 0, block.length);

                position += size;
            }

            return buffer.toByteArray();
        } else {
            return rsaEngine.processBlock(bytes, 0, bytes.length);
        }
    } catch (Exception e) {
        if (logger != null) {
            logger.error("Unable to perform RSA cipher.", e);
        }
        return new byte[0];
    }
}

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From source file:org.opcfoundation.ua.transport.security.BcCryptoProvider.java

License:Open Source License

@Override
public int decryptAsymm(PrivateKey decryptingKey, SecurityAlgorithm algorithm, byte[] dataToDecrypt,
        byte[] output, int outputOffset) throws ServiceResultException {

    java.security.interfaces.RSAPrivateCrtKey rsaPrivateKey = (java.security.interfaces.RSAPrivateCrtKey) decryptingKey;
    RSAPrivateKey privateKey = new RSAPrivateKey(rsaPrivateKey.getModulus(), rsaPrivateKey.getPublicExponent(),
            rsaPrivateKey.getPrivateExponent(), rsaPrivateKey.getPrimeP(), rsaPrivateKey.getPrimeQ(),
            rsaPrivateKey.getPrimeExponentP(), rsaPrivateKey.getPrimeExponentQ(),
            rsaPrivateKey.getCrtCoefficient());

    AsymmetricBlockCipher cipher = getAsymmetricCipher(algorithm, privateKey);

    try {/*from  w ww .j av  a2  s  .com*/

        int len = 0;
        int inputBlockSize = cipher.getInputBlockSize();
        int outputBlockSize = cipher.getOutputBlockSize();
        logger.debug("Decrypt: inputBlockSize={}, outputBlockSize={}, dataToDecrypt.length={}", inputBlockSize,
                outputBlockSize, dataToDecrypt.length);
        for (int i = 0; i < dataToDecrypt.length; i += inputBlockSize) {
            int size = Math.min(dataToDecrypt.length - i, inputBlockSize);
            byte[] tmp = cipher.processBlock(dataToDecrypt, i, size);
            System.arraycopy(tmp, 0, output, outputOffset + len, tmp.length);
            len += tmp.length;
        }
        return len;

    } catch (CryptoException e) {
        throw new ServiceResultException(StatusCodes.Bad_InternalError, e);
    }

}

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From source file:org.opcfoundation.ua.transport.security.BcCryptoProvider.java

License:Open Source License

public void encryptAsymm(PublicKey encryptingCertificate, SecurityAlgorithm algorithm, byte[] dataToEncrypt,
        byte[] output, int outputOffset) throws ServiceResultException {

    try {/*from   ww w .j av  a2  s  . c om*/
        java.security.interfaces.RSAPublicKey encryptingCertificateRSA = (java.security.interfaces.RSAPublicKey) encryptingCertificate;
        RSAPublicKey publicKey = new RSAPublicKey(encryptingCertificateRSA.getModulus(),
                encryptingCertificateRSA.getPublicExponent());
        AsymmetricBlockCipher cipher = getAsymmetricCipher(algorithm, publicKey);

        int len = 0;
        int inputBlockSize = cipher.getInputBlockSize();
        int outputBlockSize = cipher.getOutputBlockSize();
        logger.debug("Encrypt: inputBlockSize={}, outputBlockSize={}, dataToEncrypt.length={}", inputBlockSize,
                outputBlockSize, dataToEncrypt.length);
        for (int i = 0; i < dataToEncrypt.length; i += inputBlockSize) {
            int size = Math.min(dataToEncrypt.length - i, inputBlockSize);
            byte[] tmp = cipher.processBlock(dataToEncrypt, i, size);
            System.arraycopy(tmp, 0, output, outputOffset + len, tmp.length);
            len += tmp.length;
        }

    } catch (InvalidCipherTextException e) {
        throw new ServiceResultException(StatusCodes.Bad_InternalError, e);
    }

}

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