QPasswordDigestor

The QPasswordDigestor namespace contains functions which you can use to generate hashes or keys. More…

New in version 5.12.

Synopsis

Static functions

• def deriveKeyPbkdf1 (algorithm, password, salt, iterations, dkLen)

• def deriveKeyPbkdf2 (algorithm, password, salt, iterations, dkLen)

Detailed Description

static PySide2.QtNetwork.QPasswordDigestor.deriveKeyPbkdf1(algorithm, password, salt, iterations, dkLen)

Parameters:

• algorithm – Algorithm

• password – PySide2.QtCore.QByteArray

• salt – PySide2.QtCore.QByteArray

• iterations – int

• dkLen – int

Return type:

PySide2.QtCore.QByteArray

Returns a hash computed using the PBKDF1-algorithm as defined in RFC 8018 .

The function takes the data and salt , and then hashes it repeatedly for iterations iterations using the specified hash algorithm . If the resulting hash is longer than dkLen then it is truncated before it is returned.

This function only supports SHA-1 and MD5! The max output size is 160 bits (20 bytes) when using SHA-1, or 128 bits (16 bytes) when using MD5. Specifying a value for dkLen which is greater than this results in a warning and an empty QByteArray is returned. To programmatically check this limit you can use hashLength . Furthermore: the salt must always be 8 bytes long!

Note

This function is provided for use with legacy applications and all new applications are recommended to use PBKDF2 .

See also

deriveKeyPbkdf2 QCryptographicHash hashLength

static PySide2.QtNetwork.QPasswordDigestor.deriveKeyPbkdf2(algorithm, password, salt, iterations, dkLen)

Parameters:

• algorithm – Algorithm

• password – PySide2.QtCore.QByteArray

• salt – PySide2.QtCore.QByteArray

• iterations – int

• dkLen – int

Return type:

PySide2.QtCore.QByteArray

Derive a key using the PBKDF2-algorithm as defined in RFC 8018 .

This function takes the data and salt , and then applies HMAC-X, where the X is algorithm , repeatedly. It internally concatenates intermediate results to the final output until at least dkLen amount of bytes have been computed and it will execute HMAC-X iterations times each time a concatenation is required. The total number of times it will execute HMAC-X depends on iterations , dkLen and algorithm and can be calculated as iterations * ceil(dkLen / QCryptographicHash::hashLength(algorithm)) .

See also

deriveKeyPbkdf1 QMessageAuthenticationCode QCryptographicHash