Constructor Detail

• HashCreatorImplDigest

  public HashCreatorImplDigest​(String hashAlgorithm,
                               SecurityProvider provider)

  The constructor.

  Parameters:

  hashAlgorithm - the name of the hash algorithm to use (e.g. "SHA-256").

  provider - the SecurityProvider to use.

Method Detail

• wrapStream

  public OutputStream wrapStream​(OutputStream out)

  Description copied from interface: HashCreator
  Creates a new OutputStream wraps the given OutputStream. It will automatically update all written data. After data has been written, you may call HashCreator.hash(boolean) to get the hash of the data. This method will not reset this hasher. Therefore any previous updated data will also influence the hash. The typical usage is to call this method once on a fresh instance of HashCreator, then write data to that stream and finally get the hash.

  Specified by:

  wrapStream in interface HashCreator

  Parameters:

  out - the OutputStream to wrap.

  Returns:

  a wrapped OutputStream.

  See Also:

  HashCreator.wrapStream(), DigestOutputStream

• update

  public void update​(byte[] input,
                     int offset,
                     int length)

  Specified by:

  update in interface CryptoChunker

  Parameters:

  input - the next chunk of data.

  offset - the index where to start reading data from input.

  length - the number of bytes to read from input.

  See Also:

  MessageDigest.update(byte[], int, int), Signature.update(byte[], int, int)

• hash

  public byte[] hash​(boolean reset)

  Specified by:

  hash in interface HashCreator

  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()

• getOrCloneMessageDigest

  protected static MessageDigest getOrCloneMessageDigest​(MessageDigest messageDigest,
                                                         boolean clone)

  Parameters:

  messageDigest - the original MessageDigest.

  clone - - true to return a clone or copy of the original MessageDigest, false otherwise.

  Returns:

  the original MessageDigest or a clone of it in case the given clone flag was true.

• reset

  public void reset()

  Description copied from interface: CryptoProcessor
  Will reset the internal state of this object. Please note that complex algorithms especially for Cryptor may not reusable. It is therefore preferable to always create a fresh instance for each cryptographic task.

  Specified by:

  reset in interface CryptoProcessor

  See Also:

  MessageDigest.reset()