title: “ QCryptographicHash实现哈希值计算，支持多种算法\t\t”
url: 668.html
id: 668
categories:

• Qt
  date: 2017-12-12 14:20:36
  tags:

介绍

多看看Qt core模块会发现很多惊喜呀，里面包含的类很多涉及到很多方面的功能实现 先附上所有core类：Qt Core，再直接给出QCryptographicHash的帮助：QCryptographicHash 此类用于提供密码散列，哈希值。可以生成二进制或文本形式的hash值，并支持多种算法，算法可以由QCryptographicHash::Algorithm选择

支持的算法

Constant

Value

Description

QCryptographicHash::Md4

0

Generate an MD4 hash sum

QCryptographicHash::Md5

1

Generate an MD5 hash sum

QCryptographicHash::Sha1

2

Generate an SHA-1 hash sum

QCryptographicHash::Sha224

3

Generate an SHA-224 hash sum (SHA-2). Introduced in Qt 5.0

QCryptographicHash::Sha256

4

Generate an SHA-256 hash sum (SHA-2). Introduced in Qt 5.0

QCryptographicHash::Sha384

5

Generate an SHA-384 hash sum (SHA-2). Introduced in Qt 5.0

QCryptographicHash::Sha512

6

Generate an SHA-512 hash sum (SHA-2). Introduced in Qt 5.0

QCryptographicHash::Sha3_224

RealSha3_224

Generate an SHA3-224 hash sum. Introduced in Qt 5.1

QCryptographicHash::Sha3_256

RealSha3_256

Generate an SHA3-256 hash sum. Introduced in Qt 5.1

QCryptographicHash::Sha3_384

RealSha3_384

Generate an SHA3-384 hash sum. Introduced in Qt 5.1

QCryptographicHash::Sha3_512

RealSha3_512

Generate an SHA3-512 hash sum. Introduced in Qt 5.1

QCryptographicHash::Keccak_224

7

Generate a Keccak-224 hash sum. Introduced in Qt 5.9.2

QCryptographicHash::Keccak_256

8

Generate a Keccak-256 hash sum. Introduced in Qt 5.9.2

QCryptographicHash::Keccak_384

9

Generate a Keccak-384 hash sum. Introduced in Qt 5.9.2

QCryptographicHash::Keccak_512

10

Generate a Keccak-512 hash sum. Introduced in Qt 5.9.2

提供的接口

QCryptographicHash(Algorithm method)
~QCryptographicHash()
void addData(const char data, int length)
void addData(const QByteArray &data)
bool addData(QIODevice device)
void reset()
QByteArray result() const

static QByteArray hash(const QByteArray &data, Algorithm method)

可以实例化此类，构造时需要提供算法类型，然后通过addData需要计算hash的数据，最后通过result获取结果，可以利用reset清空数据但不能修改算法。 还给了一个方便易用的静态方法，直接提供算法类型及数据内容即可。

范例

include

include

include

int main(int argc, char *argv[]) {
QCoreApplication a(argc,argv);
QString text(“test”);
qDebug()< qDebug()< qDebug()< qDebug()< return 0;
}

结果

“\t\x8Fk\xCD””F!\xD3s\xCA\xDEN\x83&’\xB4\xF6”
“098f6bcd4621d373cade4e832627b4f6”
“\x1E.\x9F\xC2\x00+\x00-u\x19\x8Bu\x03!\f\x05\xA1\xBA\xAC””E`\x91j<m\x93\xBC\xCE:P\xD7\xF0\x0F\xD3\x95\xBF\x16G\xB9\xAB\xB8\xD1\xAF\xCC\x9Cv\xC2\x89\xB0\xC9””8;\xA3\x86\xA9V\xDAK8\x93””D\x17x\x9E”
“1e2e9fc2002b002d75198b7503210c05a1baac4560916a3c6d93bcce3a50d7f00fd395bf1647b9abb8d1afcc9c76c289b0c9383ba386a956da4b38934417789e”

其中test计算md5的结果是098f6bcd4621d373cade4e832627b4f6 可以在相关网站反查结果：http://www.cmd5.com/，可以证明计算正确。