org.bouncycastle.crypto.engines

Class RSAEngine

public class RSAEngine extends Object implements AsymmetricBlockCipher

this does your basic RSA algorithm.
Method Summary
intgetInputBlockSize()
Return the maximum size for an input block to this engine.
intgetOutputBlockSize()
Return the maximum size for an output block to this engine.
voidinit(boolean forEncryption, CipherParameters param)
initialise the RSA engine.
byte[]processBlock(byte[] in, int inOff, int inLen)
Process a single block using the basic RSA algorithm.

Method Detail

getInputBlockSize

public int getInputBlockSize()
Return the maximum size for an input block to this engine. For RSA this is always one byte less than the key size on encryption, and the same length as the key size on decryption.

Returns: maximum size for an input block.

getOutputBlockSize

public int getOutputBlockSize()
Return the maximum size for an output block to this engine. For RSA this is always one byte less than the key size on decryption, and the same length as the key size on encryption.

Returns: maximum size for an output block.

init

public void init(boolean forEncryption, CipherParameters param)
initialise the RSA engine.

Parameters: forEncryption true if we are encrypting, false otherwise. param the necessary RSA key parameters.

processBlock

public byte[] processBlock(byte[] in, int inOff, int inLen)
Process a single block using the basic RSA algorithm.

Parameters: in the input array. inOff the offset into the input buffer where the data starts. inLen the length of the data to be processed.

Returns: the result of the RSA process.

Throws: DataLengthException the input block is too large.