ISO9796d1Encoding (Bouncy Castle Library 1.60 API Specification)

java.lang.Object
- org.bouncycastle.crypto.encodings.ISO9796d1Encoding

All Implemented Interfaces:

AsymmetricBlockCipher
```
public class ISO9796d1Encoding
extends java.lang.Object
implements AsymmetricBlockCipher
```
ISO 9796-1 padding. Note in the light of recent results you should only use this with RSA (rather than the "simpler" Rabin keys) and you should never use it with anything other than a hash (ie. even if the message is small don't sign the message, sign it's hash) or some "random" value. See your favorite search engine for details.

Constructor Summary

Constructors
Constructor Description

ISO9796d1Encoding(AsymmetricBlockCipher cipher)

Constructors
Constructor	Description
`ISO9796d1Encoding(AsymmetricBlockCipher cipher)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`int`	`getInputBlockSize()`	return the input block size.
`int`	`getOutputBlockSize()`	return the maximum possible size for the output.
`int`	`getPadBits()`	retrieve the number of pad bits in the last decoded message.
`AsymmetricBlockCipher`	`getUnderlyingCipher()`
`void`	`init(boolean forEncryption, CipherParameters param)`	initialise the cipher.
`byte[]`	`processBlock(byte[] in, int inOff, int inLen)`	process the block of len bytes stored in in from offset inOff.
`void`	`setPadBits(int padBits)`	set the number of bits in the next message to be treated as pad bits.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - ISO9796d1Encoding
```
public ISO9796d1Encoding(AsymmetricBlockCipher cipher)
```
- Method Detail
  - getUnderlyingCipher
```
public AsymmetricBlockCipher getUnderlyingCipher()
```
  - init
```
public void init(boolean forEncryption,
                 CipherParameters param)
```
    Description copied from interface: AsymmetricBlockCipher
    
    initialise the cipher.
    
    Specified by:
    
    init in interface AsymmetricBlockCipher
    
    Parameters:
    
    forEncryption - if true the cipher is initialised for encryption, if false for decryption.
    
    param - the key and other data required by the cipher.
  - getInputBlockSize
```
public int getInputBlockSize()
```
    return the input block size. The largest message we can process is (key_size_in_bits + 3)/16, which in our world comes to key_size_in_bytes / 2.
    
    Specified by:
    
    getInputBlockSize in interface AsymmetricBlockCipher
    
    Returns:
    
    maximum size for an input block.
  - getOutputBlockSize
```
public int getOutputBlockSize()
```
    return the maximum possible size for the output.
    
    Specified by:
    
    getOutputBlockSize in interface AsymmetricBlockCipher
    
    Returns:
    
    maximum size of the output block produced by the cipher.
  - setPadBits
```
public void setPadBits(int padBits)
```
    set the number of bits in the next message to be treated as pad bits.
  - getPadBits
```
public int getPadBits()
```
    retrieve the number of pad bits in the last decoded message.
  - processBlock
```
public byte[] processBlock(byte[] in,
                           int inOff,
                           int inLen)
                    throws InvalidCipherTextException
```
    Description copied from interface: AsymmetricBlockCipher
    
    process the block of len bytes stored in in from offset inOff.
    
    Specified by:
    
    processBlock in interface AsymmetricBlockCipher
    
    Parameters:
    
    in - the input data
    
    inOff - offset into the in array where the data starts
    
    inLen - the length of the block to be processed.
    
    Returns:
    
    the resulting byte array of the encryption/decryption process.
    
    Throws:
    
    InvalidCipherTextException - data decrypts improperly.

Class ISO9796d1Encoding

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

ISO9796d1Encoding

Method Detail

getUnderlyingCipher

init

getInputBlockSize

getOutputBlockSize

setPadBits

getPadBits

processBlock