org.cryptacular.pbe

Class AbstractEncryptionScheme

java.lang.Object

org.cryptacular.pbe.AbstractEncryptionScheme

All Implemented Interfaces:

EncryptionScheme

Direct Known Subclasses:

OpenSSLEncryptionScheme, PBES1EncryptionScheme, PBES2EncryptionScheme

public abstract class AbstractEncryptionScheme
extends Object
implements EncryptionScheme

Abstract base class for password-based encryption schemes based on salt data and iterated hashing as the basis of the key derivation function.

NOTE: Classes derived from this class are not thread safe. In particular, care should be take to prevent multiple threads from performing encryption and/or decryption concurrently.

Version:

$Revision: 2744 $

Author:

Middleware Services

Constructor Summary

Constructors

Constructor and Description
AbstractEncryptionScheme()

Method Summary

Modifier and Type	Method and Description
byte[]	decrypt(byte[] ciphertext) Decrypts the given ciphertext into plaintext using the derived key.
void	decrypt(InputStream in, OutputStream out) Decrypts ciphertext from an input stream into plaintext in the output stream.
byte[]	encrypt(byte[] plaintext) Encrypts the given plaintext bytes into a byte array of ciphertext using the derived key.
void	encrypt(InputStream in, OutputStream out) Encrypts the data in the given plaintext input stream into ciphertext in the output stream.
protected void	setCipher(org.bouncycastle.crypto.BufferedBlockCipher bufferedBlockCipher) Sets the block cipher used for encryption/decryption.
protected void	setCipherParameters(org.bouncycastle.crypto.CipherParameters parameters) Sets block cipher initialization parameters.
OutputStream	wrap(boolean encryptionFlag, OutputStream out) Wraps an output stream with one that performs encryption or decryption on the fly.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AbstractEncryptionScheme

public AbstractEncryptionScheme()

Method Detail

encrypt

public byte[] encrypt(byte[] plaintext)

Description copied from interface: EncryptionScheme

Encrypts the given plaintext bytes into a byte array of ciphertext using the derived key.

Specified by:

encrypt in interface EncryptionScheme

Parameters:

plaintext - Input plaintext bytes.

Returns:

Ciphertext resulting from plaintext encryption.

encrypt

public void encrypt(InputStream in,
                    OutputStream out)
             throws IOException

Description copied from interface: EncryptionScheme

Encrypts the data in the given plaintext input stream into ciphertext in the output stream. Use EncodingOutputStream to produce ciphertext bytes that encoded as a string data in the output stream.

Specified by:

encrypt in interface EncryptionScheme

Parameters:

in - Input stream of plaintext.

out - Output stream of ciphertext.

Throws:

IOException - On stream read/write errors.

decrypt

public byte[] decrypt(byte[] ciphertext)

Description copied from interface: EncryptionScheme

Decrypts the given ciphertext into plaintext using the derived key.

Specified by:

decrypt in interface EncryptionScheme

Parameters:

ciphertext - Input ciphertext bytes.

Returns:

Plaintext resulting from ciphertext decryption.

decrypt

public void decrypt(InputStream in,
                    OutputStream out)
             throws IOException

Description copied from interface: EncryptionScheme

Decrypts ciphertext from an input stream into plaintext in the output stream. Use DecodingInputStream to handle input ciphertext encoded as string data.

Specified by:

decrypt in interface EncryptionScheme

Parameters:

in - Input stream of ciphertext.

out - Output stream of plaintext.

Throws:

IOException - On stream read/write errors.

wrap

public OutputStream wrap(boolean encryptionFlag,
                         OutputStream out)

Description copied from interface: EncryptionScheme

Wraps an output stream with one that performs encryption or decryption on the fly.

Specified by:

wrap in interface EncryptionScheme

Parameters:

encryptionFlag - True to signal encryption, false for decryption.

out - Output stream to wrap

Returns:

Wrapped output steam.

setCipher

protected void setCipher(org.bouncycastle.crypto.BufferedBlockCipher bufferedBlockCipher)

Sets the block cipher used for encryption/decryption.

Parameters:

bufferedBlockCipher - Buffered block cipher.

setCipherParameters

protected void setCipherParameters(org.bouncycastle.crypto.CipherParameters parameters)

Sets block cipher initialization parameters.

Parameters:

parameters - Cipher-specific init params.