QMessageAuthenticationCode 类提供生成基于哈希的消息身份验证代码的办法。 更多...
| 头： | #include <QMessageAuthenticationCode> |
| CMake: |
find_package(Qt6 REQUIRED COMPONENTS Core)
target_link_libraries(mytarget PRIVATE Qt6::Core) |
| qmake: | QT += core |
注意： 此类的所有函数 可重入 .
| QMessageAuthenticationCode (QCryptographicHash::Algorithm method , QByteArrayView key = {}) | |
| QMessageAuthenticationCode (QMessageAuthenticationCode && other ) | |
| ~QMessageAuthenticationCode () | |
| void | addData (QByteArrayView data ) |
| void | addData (const char * data , qsizetype length ) |
| bool | addData (QIODevice * device ) |
| void | reset () |
| QByteArray | result () const |
| QByteArrayView | resultView () const |
| void | setKey (QByteArrayView key ) |
| void | swap (QMessageAuthenticationCode & other ) |
| QMessageAuthenticationCode & | operator= (QMessageAuthenticationCode && other ) |
| QByteArray | hash (QByteArrayView message , QByteArrayView key , QCryptographicHash::Algorithm method ) |
QMessageAuthenticationCode supports all cryptographic hashes which are supported by QCryptographicHash .
To generate message authentication code, pass hash algorithm QCryptographicHash::Algorithm to constructor, then set key and message by setKey () 和 addData () functions. Result can be acquired by result () 函数。
QByteArray key = "key";
QByteArray message = "The quick brown fox jumps over the lazy dog";
...
QMessageAuthenticationCode code(QCryptographicHash::Sha256, key);
code.addData(message);
code.result().toHex(); // returns "f7bc83f430538424b13298e6aa6fb143ef4d59a14946175997479dbc2d1a3cd8"
Alternatively, this effect can be achieved by providing message, key and method to hash () 方法。
QMessageAuthenticationCode::hash(message, key, QCryptographicHash::Sha256).toHex();
另请参阅 QCryptographicHash .
[explicit]
QMessageAuthenticationCode::
QMessageAuthenticationCode
(
QCryptographicHash::Algorithm
method
,
QByteArrayView
key
= {})
Constructs an object that can be used to create a cryptographic hash from data using method method and key key .
注意：
In Qt versions prior to 6.6, this function took its arguments as
QByteArray
, not
QByteArrayView
. If you experience compile errors, it's because your code is passing objects that are implicitly convertible to
QByteArray
, but not
QByteArrayView
. Wrap the corresponding argument in
QByteArray{~~~}
to make the cast explicit. This is backwards-compatible with old Qt versions.
[noexcept, since 6.6]
QMessageAuthenticationCode::
QMessageAuthenticationCode
(
QMessageAuthenticationCode
&&
other
)
Move-constructs a new QMessageAuthenticationCode from other .
注意： The moved-from object other is placed in a partially-formed state, in which the only valid operations are destruction and assignment of a new object.
该函数在 Qt 6.6 引入。
[noexcept]
QMessageAuthenticationCode::
~QMessageAuthenticationCode
()
销毁对象。
[noexcept]
void
QMessageAuthenticationCode::
addData
(
QByteArrayView
data
)
添加 data to the message.
注意：
In Qt versions prior to 6.6, this function took its arguments as
QByteArray
, not
QByteArrayView
. If you experience compile errors, it's because your code is passing objects that are implicitly convertible to
QByteArray
, but not
QByteArrayView
. Wrap the corresponding argument in
QByteArray{~~~}
to make the cast explicit. This is backwards-compatible with old Qt versions.
另请参阅 resultView () 和 result ().
这是重载函数。
Adds the first length chars of data to the message.
读取数据，从打开
QIODevice
device
until it ends and adds it to message. Returns
true
若读取是成功的。
注意： device must be already opened.
[static]
QByteArray
QMessageAuthenticationCode::
hash
(
QByteArrayView
message
,
QByteArrayView
key
,
QCryptographicHash::Algorithm
method
)
Returns the authentication code for the message message using the key key and the method method .
注意：
In Qt versions prior to 6.6, this function took its arguments as
QByteArray
, not
QByteArrayView
. If you experience compile errors, it's because your code is passing objects that are implicitly convertible to
QByteArray
, but not
QByteArrayView
. Wrap the corresponding argument in
QByteArray{~~~}
to make the cast explicit. This is backwards-compatible with old Qt versions.
[noexcept]
void
QMessageAuthenticationCode::
reset
()
Resets message data. Calling this method doesn't affect the key.
Returns the final authentication code.
另请参阅 resultView () 和 QByteArray::toHex ().
[noexcept, since 6.6]
QByteArrayView
QMessageAuthenticationCode::
resultView
() const
返回最终的哈希值。
Note that the returned view remains valid only as long as the QMessageAuthenticationCode object is not modified by other means.
该函数在 Qt 6.6 引入。
另请参阅 result ().
[noexcept]
void
QMessageAuthenticationCode::
setKey
(
QByteArrayView
key
)
Sets secret key . Calling this method automatically resets the object state.
For optimal performance, call this method only to change the active key, not to set an initial key, as in
QMessageAuthenticationCode mac(method); mac.setKey(key); // does extra work use(mac);
Prefer to pass initial keys as the constructor argument:
QMessageAuthenticationCode mac(method, key); // OK, optimal use(mac);
You can use std::optional to delay construction of a QMessageAuthenticationCode until you know the key:
std::optional<QMessageAuthenticationCode> mac; ~~~ key = ~~~; mac.emplace(method, key); use(*mac);
注意：
In Qt versions prior to 6.6, this function took its arguments as
QByteArray
, not
QByteArrayView
. If you experience compile errors, it's because your code is passing objects that are implicitly convertible to
QByteArray
, but not
QByteArrayView
. Wrap the corresponding argument in
QByteArray{~~~}
to make the cast explicit. This is backwards-compatible with old Qt versions.
[noexcept, since 6.6]
void
QMessageAuthenticationCode::
swap
(
QMessageAuthenticationCode
&
other
)
Swaps message authentication code other with this message authentication code. This operation is very fast and never fails.
该函数在 Qt 6.6 引入。
[noexcept, since 6.6]
QMessageAuthenticationCode
&QMessageAuthenticationCode::
operator=
(
QMessageAuthenticationCode
&&
other
)
移动赋值 other 到此 QMessageAuthenticationCode 实例。
注意： The moved-from object other is placed in a partially-formed state, in which the only valid operations are destruction and assignment of a new object.
该函数在 Qt 6.6 引入。