SecureBlackbox Lite 2020 Qt Edition

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HashFunction Class

Properties   Methods   Events   Configuration Settings   Errors  

The HashFunction class implements a wide variety of algorithms for message hashing.

Syntax

HashFunction

Remarks

HashFunction allows you to hash messages using a variety of industry standard hashing algorithms. Algorithms of both Hash and HMAC type are supported.

You can feed your data to HashFunction in one go, or in chunks. Use Hash method to initialize the hash function, pass the buffer, and calculate the hash in one line of code. Alternatively, use Reset, Update, and Finish in sequence to perform each of those steps individually. You can call Update (and its UpdateFile and UpdateStream variants) repeatedly between Reset and Finish, effectively passing the data in a number of portions:

  // Feeding the data in one go:
  Hashfunction hf = new Hashfunction();
  hf.Algorithm = "SHA256";
  byte[] hash = hf.Hash(buffer);

  // Feeding data chunk by chunk:
  Hashfunction hf = new Hashfunction();
  hf.Algorithm = "SHA256";
  hf.Reset(); 
  hf.Update(buffer1);
  hf.Update(buffer2);
  hf.Update(buffer3);
  byte[] hash = hf.Finish();

To use keyed HMAC, you need to provide the secret key first. Use CryptoKeyManager to create and initialize the key object:

  Cryptokeymanager km = new Cryptokeymanager();
  km.ImportBytes(hmacKey, Constants.kffDER, "SHA256", "", "", Constants.ktSecret);

  Hashfunction hf = new Hashfunction();
  hf.Algorithm = "SHA256";
  hf.Key = km.Key;
  byte[] hash = hf.Hash(buffer);

Use OutputEncoding to set the desired encoding method.

Property List


The following is the full list of the properties of the class with short descriptions. Click on the links for further details.

AlgorithmThe hash algorithm to use when hashing data.
JsonKeyHeaderParamsContains key header parameters.
JsonProtectedHeaderProvides access to the header being protected.
JsonUnprotectedHeaderProvides access to the unprotected part of the header.
JsonUnprotectedHeaderParamsContains unprotected header parameters.
KeyAlgorithmThe algorithm of the cryptographic key.
KeyBitsThe length of the key in bits.
KeyExportableReturns True if the key is exportable (can be serialized into an array of bytes), and False otherwise.
KeyHandleAllows to get or set a 'handle', a unique identifier of the underlying property object.
KeyIDProvides access to a storage-specific key identifier.
KeyIVThe initialization vector (IV) of a symmetric key.
KeyKeyThe byte array representation of the key.
KeyNonceA nonce value associated with a key.
KeyPrivateReturns True if the object hosts a private key, and False otherwise.
KeyPublicReturns True if the object hosts a public key, and False otherwise.
KeySubjectReturns the key subject.
KeySymmetricReturns True if the object contains a symmetric key, and False otherwise.
KeyValidReturns True if this key is valid.
OutputEncodingThe encoding to use for the output data.

Method List


The following is the full list of the methods of the class with short descriptions. Click on the links for further details.

ConfigSets or retrieves a configuration setting.
FinishCompletes the hash and returns the resulting message digest.
HashCalculates a message digest over a byte array.
HashFileCalculates a message digest over data contained in a file.
HashStreamCalculates a message digest over data contained in a stream.
ResetResets the hash function context.
UpdateFeeds a chunk of data to the hash function.
UpdateFileFeeds the contents of a file to the hash function.
UpdateStreamFeeds the contents of a stream to the hash function.

Event List


The following is the full list of the events fired by the class with short descriptions. Click on the links for further details.

ErrorInforms about errors during cryptographic operations.
NotificationThis event notifies the application about an underlying control flow event.

Configuration Settings


The following is a list of configuration settings for the class with short descriptions. Click on the links for further details.

TempPathPath for storing temporary files.

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SecureBlackbox Lite 2020 Qt Edition - Version 20.0 [Build 8166]