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 java.lang.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 $

Field Summary

Fields

Modifier and Type	Field and Description
private org.bouncycastle.crypto.BufferedBlockCipher	cipher Cipher used for encryption and decryption.
private org.bouncycastle.crypto.CipherParameters	parameters Cipher initialization parameters.

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(java.io.InputStream in, java.io.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(java.io.InputStream in, java.io.OutputStream out) Encrypts the data in the given plaintext input stream into ciphertext in the output stream.
private byte[]	process(byte[] input) Run the given data through the initialized underlying cipher and return the result.
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.

Methods inherited from class java.lang.Object

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

Field Detail

cipher

private org.bouncycastle.crypto.BufferedBlockCipher cipher

Cipher used for encryption and decryption.

parameters

private org.bouncycastle.crypto.CipherParameters parameters

Cipher initialization parameters.

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(java.io.InputStream in,
                    java.io.OutputStream out)
             throws java.io.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:

java.io.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(java.io.InputStream in,
                    java.io.OutputStream out)
             throws java.io.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:

java.io.IOException - On stream read/write errors.

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.

process

private byte[] process(byte[] input)

Run the given data through the initialized underlying cipher and return the result.

Parameters:

input - Input data.

Returns:

Result of cipher acting on input.