org.spongycastle.crypto.generators

Class PKCS5S1ParametersGenerator

java.lang.Object

org.spongycastle.crypto.PBEParametersGenerator

org.spongycastle.crypto.generators.PKCS5S1ParametersGenerator

public class PKCS5S1ParametersGenerator
extends PBEParametersGenerator

Generator for PBE derived keys and ivs as defined by PKCS 5 V2.0 Scheme 1. Note this generator is limited to the size of the hash produced by the digest used to drive it.

The document this implementation is based on can be found at RSA's PKCS5 Page

Field Summary

Fields inherited from class org.spongycastle.crypto.PBEParametersGenerator

iterationCount, password, salt

Constructor Summary

Constructors

Constructor and Description
PKCS5S1ParametersGenerator(Digest digest) Construct a PKCS 5 Scheme 1 Parameters generator.

Method Summary

Modifier and Type	Method and Description
CipherParameters	generateDerivedMacParameters(int keySize) Generate a key parameter for use with a MAC derived from the password, salt, and iteration count we are currently initialised with.
CipherParameters	generateDerivedParameters(int keySize) Generate a key parameter derived from the password, salt, and iteration count we are currently initialised with.
CipherParameters	generateDerivedParameters(int keySize, int ivSize) Generate a key with initialisation vector parameter derived from the password, salt, and iteration count we are currently initialised with.

Methods inherited from class org.spongycastle.crypto.PBEParametersGenerator

getIterationCount, getPassword, getSalt, init, PKCS12PasswordToBytes, PKCS5PasswordToBytes, PKCS5PasswordToUTF8Bytes

Methods inherited from class java.lang.Object

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

Constructor Detail

PKCS5S1ParametersGenerator

public PKCS5S1ParametersGenerator(Digest digest)

Construct a PKCS 5 Scheme 1 Parameters generator.

Parameters:

digest - the digest to be used as the source of derived keys.

Method Detail

generateDerivedParameters

public CipherParameters generateDerivedParameters(int keySize)

Generate a key parameter derived from the password, salt, and iteration count we are currently initialised with.

Specified by:

generateDerivedParameters in class PBEParametersGenerator

Parameters:

keySize - the size of the key we want (in bits)

Returns:

a KeyParameter object.

Throws:

java.lang.IllegalArgumentException - if the key length larger than the base hash size.

generateDerivedParameters

public CipherParameters generateDerivedParameters(int keySize,
                                                  int ivSize)

Generate a key with initialisation vector parameter derived from the password, salt, and iteration count we are currently initialised with.

Specified by:

generateDerivedParameters in class PBEParametersGenerator

Parameters:

keySize - the size of the key we want (in bits)

ivSize - the size of the iv we want (in bits)

Returns:

a ParametersWithIV object.

Throws:

java.lang.IllegalArgumentException - if keySize + ivSize is larger than the base hash size.

generateDerivedMacParameters

public CipherParameters generateDerivedMacParameters(int keySize)

Generate a key parameter for use with a MAC derived from the password, salt, and iteration count we are currently initialised with.

Specified by:

generateDerivedMacParameters in class PBEParametersGenerator

Parameters:

keySize - the size of the key we want (in bits)

Returns:

a KeyParameter object.

Throws:

java.lang.IllegalArgumentException - if the key length larger than the base hash size.