Example usage for org.bouncycastle.crypto.paddings PaddedBufferedBlockCipher reset

Introduction

In this page you can find the example usage for org.bouncycastle.crypto.paddings PaddedBufferedBlockCipher reset.

Prototype

public void reset() 

Source Link

Document

Reset the buffer and cipher.

Usage

From source file:org.albertschmitt.crypto.AESService.java

License:Open Source License

/**
 * Return a PaddedBufferedBlockCipher for encryption or decryption.
 *
 * @param iv The initialization vector./*from  w  ww.j  a v a 2  s  . co  m*/
 * @param forEncryption True to encrypt, false to decrypt.
 * @return PaddedBufferedBlockCipher configured to encrypt or decrypt.
 */
private PaddedBufferedBlockCipher getCipher(byte[] iv, Boolean forEncryption) {
    ParametersWithIV ivKeyParam = new ParametersWithIV(aes_key, iv);
    BlockCipherPadding padding = new PKCS7Padding();
    PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESEngine()),
            padding);
    cipher.reset();
    cipher.init(forEncryption, ivKeyParam);

    return cipher;
}

---

From source file:org.xwiki.crypto.passwd.internal.AbstractPasswordCiphertext.java

License:Open Source License

/**
 * {@inheritDoc}//from   w  ww.j a  v  a2  s .  co  m
 * 
 * @see org.xwiki.crypto.passwd.PasswordCiphertext#init(byte[], java.lang.String, org.xwiki.crypto.passwd.KeyDerivationFunction)
 */
public synchronized void init(byte[] message, String password, KeyDerivationFunction initializedKeyFunction)
        throws GeneralSecurityException {
    this.keyFunction = initializedKeyFunction;

    PaddedBufferedBlockCipher theCipher = this.getCipher();
    theCipher.reset();
    theCipher.init(true, this.makeKey(password));

    try {
        this.ciphertext = new byte[theCipher.getOutputSize(message.length)];

        int length = theCipher.processBytes(message, 0, message.length, this.ciphertext, 0);
        theCipher.doFinal(this.ciphertext, length);
    } catch (InvalidCipherTextException e) {
        // I don't think this should ever happen for encrypting.
        throw new GeneralSecurityException("Failed to encrypt text", e);
    }
}

---

From source file:org.xwiki.crypto.passwd.internal.AbstractPasswordCiphertext.java

License:Open Source License

/**
 * {@inheritDoc}/*from   w  ww  .ja  v a  2s.co m*/
 * 
 * @see org.xwiki.crypto.passwd.PasswordCiphertext#decrypt(java.lang.String)
 */
public synchronized byte[] decrypt(String password) throws GeneralSecurityException {
    PaddedBufferedBlockCipher theCipher = this.getCipher();
    theCipher.reset();
    theCipher.init(false, this.makeKey(password));

    try {
        final byte[] out = new byte[theCipher.getOutputSize(ciphertext.length)];

        int length = theCipher.processBytes(ciphertext, 0, ciphertext.length, out, 0);
        int remaining = theCipher.doFinal(out, length);

        // length+remaining is the actual length of the output. getOutputSize is close but still leaves a few
        // nulls at the top of the array.
        final byte[] unpadded = new byte[length + remaining];
        System.arraycopy(out, 0, unpadded, 0, unpadded.length);

        return unpadded;
    } catch (InvalidCipherTextException e) {
        // We are going to assume here that the password was wrong.
        return null;
    }
}

---