QMessageAuthenticationCode

The QMessageAuthenticationCode class provides a way to generate hash-based message authentication codes. More…

Synopsis

Functions

• def addData (data)

• def addData (data, length)

• def addData (device)

• def reset ()

• def result ()

• def setKey (key)

Static functions

• def hash (message, key, method)

Detailed Description

QMessageAuthenticationCode supports all cryptographic hashes which are supported by QCryptographicHash .

To generate message authentication code, pass hash algorithm Algorithm to constructor, then set key and message by setKey() and addData() functions. Result can be acquired by result() function.

QByteArray key = "key";
QByteArray message = "The quick brown fox jumps over the lazy dog";
...
QMessageAuthenticationCode code(QCryptographicHash::Sha1);
code.setKey(key);
code.addData(message);
code.result().toHex();      // returns "de7c9b85b8b78aa6bc8a7a36f70a90701c9db4d9"

Alternatively, this effect can be achieved by providing message, key and method to hash() method.

QMessageAuthenticationCode::hash(message, key, QCryptographicHash::Sha1).toHex();

See also

QCryptographicHash

class PySide2.QtCore.QMessageAuthenticationCode(method[, key=QByteArray()])

param method:

Algorithm

param key:

PySide2.QtCore.QByteArray

Constructs an object that can be used to create a cryptographic hash from data using method method and key key .

PySide2.QtCore.QMessageAuthenticationCode.addData(device)

Parameters:

device – PySide2.QtCore.QIODevice

Return type:

bool

Reads the data from the open QIODevice device until it ends and adds it to message. Returns true if reading was successful.

Note

device must be already opened.

PySide2.QtCore.QMessageAuthenticationCode.addData(data)

Parameters:

data – PySide2.QtCore.QByteArray

PySide2.QtCore.QMessageAuthenticationCode.addData(data, length)

Parameters:

• data – str

• length – int

Adds the first length chars of data to the message.

static PySide2.QtCore.QMessageAuthenticationCode.hash(message, key, method)

Parameters:

• message – PySide2.QtCore.QByteArray

• key – PySide2.QtCore.QByteArray

• method – Algorithm

Return type:

PySide2.QtCore.QByteArray

Returns the authentication code for the message message using the key key and the method method .

PySide2.QtCore.QMessageAuthenticationCode.reset()

Resets message data. Calling this method doesn’t affect the key.

PySide2.QtCore.QMessageAuthenticationCode.result()

Return type:

PySide2.QtCore.QByteArray

Returns the final authentication code.

See also

toHex()

PySide2.QtCore.QMessageAuthenticationCode.setKey(key)

Parameters:

key – PySide2.QtCore.QByteArray

Sets secret key . Calling this method automatically resets the object state.