memetic.crypto
Interface Crypt

All Known Implementing Classes:

AESCrypt, DESCrypt

public interface Crypt

Version:

1-1-alpha3

Author:

Andrew G D Rowley

Method Summary

int	decrypt(byte[] input, int offset, int length, byte[] output, int outOffset) Decrypts the input
int	encrypt(byte[] input, int offset, int length, byte[] output, int outOffset) Encrypts the input
int	getBlockSize() Returns the size of the block of the encryption or decryption
int	getDecryptOutputSize(int inputSize) Returns the maximum size the output buffer needs to be
int	getEncryptOutputSize(int inputSize) Returns the maximum size the output buffer needs to be

Method Detail

encrypt

int encrypt(byte[] input,
            int offset,
            int length,
            byte[] output,
            int outOffset)
            throws javax.crypto.ShortBufferException,
                   javax.crypto.IllegalBlockSizeException,
                   javax.crypto.BadPaddingException,
                   java.security.InvalidKeyException,
                   java.security.InvalidAlgorithmParameterException

Encrypts the input

Parameters:

input - The input to be encrypted

offset - The offset into the input buffer where the input starts

length - The length of the input

output - The output buffer

outOffset - The offset into the output buffer where to store the output

Returns:

The length of the output stored in the output buffer

Throws:

javax.crypto.BadPaddingException

javax.crypto.IllegalBlockSizeException

javax.crypto.ShortBufferException

java.security.InvalidAlgorithmParameterException

java.security.InvalidKeyException

decrypt

int decrypt(byte[] input,
            int offset,
            int length,
            byte[] output,
            int outOffset)
            throws javax.crypto.ShortBufferException,
                   javax.crypto.IllegalBlockSizeException,
                   javax.crypto.BadPaddingException,
                   java.security.InvalidKeyException,
                   java.security.InvalidAlgorithmParameterException

Decrypts the input

Parameters:

input - The input to be decrypted

offset - The offset into the input buffer where the input starts

length - The length of the input

output - The output buffer

outOffset - The offset into the output buffer where to store the output

Returns:

The length of the output stored in the output buffer

Throws:

javax.crypto.BadPaddingException

javax.crypto.IllegalBlockSizeException

javax.crypto.ShortBufferException

java.security.InvalidAlgorithmParameterException

java.security.InvalidKeyException

getEncryptOutputSize

int getEncryptOutputSize(int inputSize)

Returns the maximum size the output buffer needs to be

Parameters:

inputSize - The size of the input to be encrypted

Returns:

The maximum size of the output buffer

Throws:

java.security.InvalidAlgorithmParameterException

java.security.InvalidKeyException

getDecryptOutputSize

int getDecryptOutputSize(int inputSize)

Returns the maximum size the output buffer needs to be

Parameters:

inputSize - The size of the input to be decrypted

Returns:

The maximum size of the output buffer

getBlockSize

int getBlockSize()

Returns the size of the block of the encryption or decryption

Returns:

The block size (in bytes)