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

Introduction

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

Prototype

void init(int mode, Key key, AlgorithmParameterSpec params)
        throws InvalidKeyException, InvalidAlgorithmParameterException;

Source Link

Document

Initializes the cipher with mode, key and iv.

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();//w w w .  j a v a  2  s  .  c om

    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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