ewe.security
Class RSAKey

java.lang.Object
  ewe.security.RSAKey

All Implemented Interfaces:

ByteEncodable, EncryptionKey

public class RSAKey

extends Object

implements ByteEncodable, EncryptionKey

An RSAKey holds either a private or public key and will also perform encryption/decryption operations. No data as to whether it is private or public is stored here, you can place that in a higher level object if needed.

Note that due to the nature of this encryption calling decrypt() on data generated by encrypt() on the same key will not yield the original text. With this type of encryption you can only use a key to decrypt the data encrypted by its public/private counterpart.

Use the class RSA to generate a new pair of keys.

Field Summary

protected BigInteger	exp
protected BigInteger	value

Constructor Summary

protected	RSAKey()
	RSAKey(byte[] encodedBytes, int offset, int length) This creates the key from the bytes as encoded by encodeBytes.

Method Summary

byte[]	decrypt(byte[] encrypted, int offset, int length) Decrypt the data as encrypted by this key's counterpart.
int	encodeBytes(ByteArray dest) Used to store the key in a stream of bytes.
byte[]	encrypt(byte[] data, int offset, int length) Encrypt the provided data.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, toString

Field Detail

exp

protected BigInteger exp

value

protected BigInteger value

Constructor Detail

RSAKey

protected RSAKey()

RSAKey

public RSAKey(byte[] encodedBytes,
              int offset,
              int length)
       throws StreamCorruptedException

This creates the key from the bytes as encoded by encodeBytes.

Method Detail

encodeBytes

public int encodeBytes(ByteArray dest)

Used to store the key in a stream of bytes. It is recommended that whenever the private key is stored it is encrypted using an encryption like that provided by ewe.security.Encryptor.

Specified by:

encodeBytes in interface ByteEncodable

Parameters:

dest - The destination ByteArray, or null to determine the number of bytes needed to encode.

Returns:

The number of bytes appended to the ByteArray or the number of bytes needed to encode.

encrypt

public byte[] encrypt(byte[] data,
                      int offset,
                      int length)
               throws IOException

Encrypt the provided data.

Specified by:

encrypt in interface EncryptionKey

Throws:

IOException

decrypt

public byte[] decrypt(byte[] encrypted,
                      int offset,
                      int length)
               throws IOException

Decrypt the data as encrypted by this key's counterpart.

Specified by:

decrypt in interface EncryptionKey

Throws:

IOException