HashCreatorImplMultipleRounds (JavaDocs for mmm-all 1.0.0-SNAPSHOT)

java.lang.Object
- io.github.mmm.crypto.algorithm.AbstractSecurityAlgorithm
- - io.github.mmm.crypto.algorithm.AbstractCryptoAlgorithmWithProvider
  - - io.github.mmm.crypto.algorithm.CryptoAlgorithmImpl
    - - io.github.mmm.crypto.hash.HashCreatorImplDigest
      - io.github.mmm.crypto.hash.HashCreatorImplMultipleRounds

All Implemented Interfaces:

CryptoAlgorithm, CryptoChunker, CryptoProcessor, HashCreator
```
public class HashCreatorImplMultipleRounds
extends HashCreatorImplDigest
```
This is an implementation of HashCreator that calculates hashes in multiple rounds. Therefore, the actual data is hashed once and then for the number of rounds given at construction time the initial hash is hashed again with the same hash algorithm.

Since:

1.0.0

Author:

Joerg Hohwiller (hohwille at users.sourceforge.net)

Field Summary
- Fields inherited from class io.github.mmm.crypto.algorithm.AbstractCryptoAlgorithmWithProvider
  provider

Constructor Summary

Constructors
Constructor	Description
`HashCreatorImplMultipleRounds(String hashAlgorithm, SecurityProvider provider, int iterationCount)`	The constructor.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type Method Description

byte[] hash(boolean reset)
- Methods inherited from class io.github.mmm.crypto.hash.HashCreatorImplDigest
  getOrCloneMessageDigest, reset, update, wrapStream
- Methods inherited from class io.github.mmm.crypto.algorithm.CryptoAlgorithmImpl
  getAlgorithm
- Methods inherited from class io.github.mmm.crypto.algorithm.AbstractCryptoAlgorithmWithProvider
  getProvider
- Methods inherited from class io.github.mmm.crypto.algorithm.AbstractSecurityAlgorithm
  creationFailedException, creationFailedException, creationFailedException, creationFailedException, getAlgorithm, toString
- Methods inherited from class java.lang.Object
  clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
- Methods inherited from interface io.github.mmm.crypto.algorithm.CryptoAlgorithm
  getAlgorithm
- Methods inherited from interface io.github.mmm.crypto.CryptoChunker
  update, update
- Methods inherited from interface io.github.mmm.crypto.CryptoProcessor
  process, process, process
- Methods inherited from interface io.github.mmm.crypto.hash.HashCreator
  hash, hash, hash, hash, process, wrapStream

- Constructor Detail
  - HashCreatorImplMultipleRounds
```
public HashCreatorImplMultipleRounds(String hashAlgorithm,
                                     SecurityProvider provider,
                                     int iterationCount)
```
    The constructor.
    
    Parameters:
    
    hashAlgorithm - the name of the hash algorithm to use (e.g. "SHA-256").
    
    iterationCount - AbstractGetIterationCount. Has to be greater than 1.
    
    provider - the SecurityProvider to use.
- Method Detail
  - hash
```
public byte[] hash(boolean reset)
```
    Specified by:
    
    hash in interface HashCreator
    
    Overrides:
    
    hash in class HashCreatorImplDigest
    
    Parameters:
    
    reset - - true if this HashCreator shall be reset after the hash calculation, false otherwise. A design problem of MessageDigest is that it automatically resets itself on hashing what prevents calculating intermediate hashes but also continue the hash calculation. This API allows to workaround this limitation.
    
    Returns:
    
    the calculated hash of the current data.
    
    See Also:
    
    MessageDigest.digest()