QPasswordDigestor 命名空间

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

头文件	#include <QPasswordDigestor>
CMake	find_package(Qt6 REQUIRED COMPONENTS Network) target_link_libraries(mytarget PRIVATE Qt6::Network)
qmake	QT += network

函数

QByteArray	deriveKeyPbkdf1(QCryptographicHash::Algorithm algorithm, const QByteArray &data, const QByteArray &salt, int iterations, quint64 dkLen)
QByteArray	deriveKeyPbkdf2(QCryptographicHash::Algorithm algorithm, const QByteArray &data, const QByteArray &salt, int iterations, quint64 dkLen)

详细描述

函数文档

QByteArray QPasswordDigestor::deriveKeyPbkdf1(QCryptographicHash::Algorithm algorithm, const QByteArray &data, const QByteArray &salt, int iterations, quint64 dkLen)

Returns a hash computed using the PBKDF1-algorithm as defined in RFC 8018, section 5.1.

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 QCryptographicHash::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.

QByteArray QPasswordDigestor::deriveKeyPbkdf2(QCryptographicHash::Algorithm algorithm, const QByteArray &data, const QByteArray &salt, int iterations, quint64 dkLen)

Derive a key using the PBKDF2-algorithm as defined in RFC 8018, section 5.2.

此函数接收数据和盐值，然后反复应用HMAC-X算法，其中X为算法。函数内部将中间结果连接到最终输出，直到计算出的字节至少达到dkLen量为止。当需要连接时，它将执行HMAC-X的迭代次数。HMAC-X执行的总次数取决于迭代次数、dkLen和算法，可计算为iterations * ceil(dkLen / QCryptographicHash::hashLength(algorithm))。

也见deriveKeyPbkdf1、QMessageAuthenticationCode和QCryptographicHash。