如何使用 Qt 获取文件的 SHA-1/MD5 校验和?

2021-12-27 00:00:00 qt hash checksum c++

有没有办法在 Qt 中获取磁盘上文件的 MD5 或 SHA-1 校验和/哈希?

Is there a way to get the MD5 or SHA-1 checksum/hash of a file on disk in Qt?

例如，我有文件路径，我可能需要验证该文件的内容是否与某个哈希值匹配.

For example, I have the file path and I might need to verify that the contents of that file matches a certain hash value.

推荐答案

用 QFile 打开文件，并调用 readAll() 将其内容拉入 QByteArray.然后将其用于 QCryptographicHash::hash(const QByteArray& data, Algorithm method) 调用.

Open the file with QFile, and call readAll() to pull it's contents into a QByteArray. Then use that for the QCryptographicHash::hash(const QByteArray& data, Algorithm method) call.

在 Qt5 中你可以使用 addData():

In Qt5 you can use addData():

// Returns empty QByteArray() on failure.
QByteArray fileChecksum(const QString &fileName, 
                        QCryptographicHash::Algorithm hashAlgorithm)
{
    QFile f(fileName);
    if (f.open(QFile::ReadOnly)) {
        QCryptographicHash hash(hashAlgorithm);
        if (hash.addData(&f)) {
            return hash.result();
        }
    }
    return QByteArray();
}

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