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## org.bouncycastle.crypto.generators
Class PKCS5S1ParametersGenerator

    java.lang.Object
      |
      +--org.bouncycastle.crypto.PBEParametersGenerator
            |
            +--org.bouncycastle.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.bouncycastle.crypto.PBEParametersGenerator
`iterationCount, password, salt`

Constructor Summary
`PKCS5S1ParametersGenerator(Digest digest)` Construct a PKCS 5 Scheme 1 Parameters generator.

Method Summary
`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.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`

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.

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