Example usage for org.apache.commons.crypto.cipher CryptoCipher update

Introduction

In this page you can find the example usage for org.apache.commons.crypto.cipher CryptoCipher update.

Prototype

int update(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset)
        throws ShortBufferException;

Source Link

Document

Continues a multiple-part encryption/decryption operation.

Usage

From source file:org.apache.commons.crypto.examples.CipherByteArrayExample.java

public static void main(String[] args) throws Exception {

    final SecretKeySpec key = new SecretKeySpec(getUTF8Bytes("1234567890123456"), "AES");
    final IvParameterSpec iv = new IvParameterSpec(getUTF8Bytes("1234567890123456"));

    Properties properties = new Properties();
    properties.setProperty(CryptoCipherFactory.CLASSES_KEY, CipherProvider.OPENSSL.getClassName());
    //Creates a CryptoCipher instance with the transformation and properties.
    final String transform = "AES/CBC/PKCS5Padding";
    CryptoCipher encipher = Utils.getCipherInstance(transform, properties);
    System.out.println("Cipher:  " + encipher.getClass().getCanonicalName());

    final String sampleInput = "hello world!";
    System.out.println("input:  " + sampleInput);

    byte[] input = getUTF8Bytes(sampleInput);
    byte[] output = new byte[32];

    //Initializes the cipher with ENCRYPT_MODE, key and iv.
    encipher.init(Cipher.ENCRYPT_MODE, key, iv);
    //Continues a multiple-part encryption/decryption operation for byte array.
    int updateBytes = encipher.update(input, 0, input.length, output, 0);
    System.out.println(updateBytes);
    //We must call doFinal at the end of encryption/decryption.
    int finalBytes = encipher.doFinal(input, 0, 0, output, updateBytes);
    System.out.println(finalBytes);
    //Closes the cipher.
    encipher.close();//from w  w  w .ja  v a  2 s .c  o  m

    System.out.println(Arrays.toString(Arrays.copyOf(output, updateBytes + finalBytes)));

    // Now reverse the process using a different implementation with the same settings
    properties.setProperty(CryptoCipherFactory.CLASSES_KEY, CipherProvider.JCE.getClassName());
    CryptoCipher decipher = Utils.getCipherInstance(transform, properties);
    System.out.println("Cipher:  " + encipher.getClass().getCanonicalName());

    decipher.init(Cipher.DECRYPT_MODE, key, iv);
    byte[] decoded = new byte[32];
    decipher.doFinal(output, 0, updateBytes + finalBytes, decoded, 0);

    System.out.println("output: " + new String(decoded, StandardCharsets.UTF_8));
}

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From source file:org.apache.spark.network.crypto.AuthEngine.java

private byte[] doCipherOp(CryptoCipher cipher, byte[] in, boolean isFinal) throws GeneralSecurityException {

    Preconditions.checkState(cipher != null);

    int scale = 1;
    while (true) {
        int size = in.length * scale;
        byte[] buffer = new byte[size];
        try {//  ww w. j  a  v  a 2  s.  com
            int outSize = isFinal ? cipher.doFinal(in, 0, in.length, buffer, 0)
                    : cipher.update(in, 0, in.length, buffer, 0);
            if (outSize != buffer.length) {
                byte[] output = new byte[outSize];
                System.arraycopy(buffer, 0, output, 0, output.length);
                return output;
            } else {
                return buffer;
            }
        } catch (ShortBufferException e) {
            // Try again with a bigger buffer.
            scale *= 2;
        }
    }
}

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