iaik.pkcs.pkcs1

Class Padding

java.lang.Object

iaik.pkcs.pkcs1.Padding

Direct Known Subclasses:

PKCS1v15Padding

public abstract class Padding
extends java.lang.Object

Abstract super class for all PKCS#1 based padding schemes.

After initializing the Padding engine, call method pad or unpad for performing a padding or unpadding operation, respectively:

 padding.init(Padding.PAD_MODE, key, modLen, params, random);
 byte[] paddedMessage = padding.pad(message);
 

respectively

 padding.init(Padding.UNPAD_MODE, key, modLen, params, random);
 byte[] message = padding.unpad(paddingMessage);
 

Version:

File Revision 9

Field Summary

Fields

Modifier and Type	Field and Description
protected int	modLen_ The length of the key modulus.
protected int	opMode_ The operation mode; either PAD_MODE (1) or UNPAD_MODE (2)
static java.lang.String	PADDING_NONE No padding.
static java.lang.String	PADDING_OAEP PKCS#1v2.1 OAEP padding.
static java.lang.String	PADDING_PKCS1 PKCS#1v1.5 padding.
static java.lang.String	PADDING_PKCS1_SSL2 PKCS#1v1.5 padding for SSL2.
protected java.security.PrivateKey	privateKey_ The private RSA key.
protected java.security.PublicKey	publicKey_ The public RSA key.

Method Summary

Methods

Modifier and Type	Method and Description
abstract java.security.AlgorithmParameters	getParameters()
void	init(int paddingMode, java.security.Key key, int modLen, java.security.spec.AlgorithmParameterSpec params, java.security.SecureRandom random) Initializes this Padding engine.
abstract byte[]	pad(byte[] data) Pads the supplied data.
abstract byte[]	unpad(byte[] paddedData) Unpads the supplied padded data.

Methods inherited from class java.lang.Object

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

Field Detail

PADDING_NONE

public static final java.lang.String PADDING_NONE

No padding.

See Also:

Constant Field Values

PADDING_PKCS1

public static final java.lang.String PADDING_PKCS1

PKCS#1v1.5 padding.

See Also:

Constant Field Values

PADDING_PKCS1_SSL2

public static final java.lang.String PADDING_PKCS1_SSL2

PKCS#1v1.5 padding for SSL2.

See Also:

Constant Field Values

PADDING_OAEP

public static final java.lang.String PADDING_OAEP

PKCS#1v2.1 OAEP padding.

See Also:

Constant Field Values

privateKey_

protected java.security.PrivateKey privateKey_

The private RSA key.

publicKey_

protected java.security.PublicKey publicKey_

The public RSA key.

modLen_

protected int modLen_

The length of the key modulus.

opMode_

protected int opMode_

The operation mode; either PAD_MODE (1) or UNPAD_MODE (2)

Method Detail

init

public void init(int paddingMode,
        java.security.Key key,
        int modLen,
        java.security.spec.AlgorithmParameterSpec params,
        java.security.SecureRandom random)
          throws java.security.InvalidKeyException,
                 java.security.InvalidAlgorithmParameterException

Initializes this Padding engine.

Parameters:

paddingMode - the padding mode, either PAD_MODE (1) or UNPAD_MODE (2)

key - the en/decryption key; maybe used for checking conformance to the padding scheme

modLen - the length of the key modulus

params - parameters any parameters required by the padding scheme

random - generator supplying random numbers if required

Throws:

java.security.InvalidKeyException - if the key is not appropriate for the padding scheme

java.security.InvalidAlgorithmParameterException - if the parameters are invalid, or the padding mode is invalid (not PAD_MODE (1) or UNPAD_MODE (2)

getParameters

public abstract java.security.AlgorithmParameters getParameters()

pad

public abstract byte[] pad(byte[] data)
                    throws javax.crypto.BadPaddingException

Pads the supplied data.

Parameters:

data - the data to be padded

Returns:

the padded data

Throws:

javax.crypto.BadPaddingException - if an error occurs during padding the data

unpad

public abstract byte[] unpad(byte[] paddedData)
                      throws javax.crypto.BadPaddingException

Unpads the supplied padded data.

Parameters:

paddedData - the data to be unpadded

Returns:

the unpadded data

Throws:

javax.crypto.BadPaddingException - if the padding was invalid