org.bouncycastle.crypto.generators
Class OpenSSLPBEParametersGenerator

java.lang.Object
  org.bouncycastle.crypto.PBEParametersGenerator
      org.bouncycastle.crypto.generators.OpenSSLPBEParametersGenerator

public class OpenSSLPBEParametersGenerator
extends PBEParametersGenerator

Generator for PBE derived keys and ivs as usd by OpenSSL.

The scheme is a simple extension of PKCS 5 V2.0 Scheme 1 using MD5 with an iteration count of 1.

Field Summary

private Digest

digest

Fields inherited from class org.bouncycastle.crypto.PBEParametersGenerator

iterationCount, password, salt

Constructor Summary

OpenSSLPBEParametersGenerator()
Construct a OpenSSL Parameters generator.

Method Summary

private byte[]	generateDerivedKey(int bytesNeeded) the derived key function, the ith hash of the password and the salt.
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.
void	init(byte[] password, byte[] salt) Initialise - note the iteration count for this algorithm is fixed at 1.

Methods inherited from class org.bouncycastle.crypto.PBEParametersGenerator

getIterationCount, getPassword, getSalt, init, PKCS12PasswordToBytes, PKCS5PasswordToBytes

Methods inherited from class java.lang.Object

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

Field Detail

digest

private Digest digest

Constructor Detail

OpenSSLPBEParametersGenerator

public OpenSSLPBEParametersGenerator()

Construct a OpenSSL Parameters generator.

Method Detail

init

public void init(byte[] password,
                 byte[] salt)

Initialise - note the iteration count for this algorithm is fixed at 1.

Parameters:

password - password to use.

salt - salt to use.

generateDerivedKey

private byte[] generateDerivedKey(int bytesNeeded)

the derived key function, the ith hash of the password and the salt.

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.