Qt 中md5 计算

#include <QCryptographicHash>

QByteArray hash2 = QCryptographicHash::hash(password.toLocal8Bit(), QCryptographicHash::Md5);
auto pwd = hash2.toHex().toStdString();

源代码

QByteArray QCryptographicHash::hash(const QByteArray &data, Algorithm method)
{
    QCryptographicHash hash(method);
    hash.addData(data);
    return hash.result();
}

void QCryptographicHash::addData(const QByteArray &data)
{
    addData(data.constData(), data.length());
}

void QCryptographicHash::addData(const char *data, int length)
{
    switch (d->method) {
    case Sha1:
        sha1Update(&d->sha1Context, (const unsigned char *)data, length);
        break;
#ifdef QT_CRYPTOGRAPHICHASH_ONLY_SHA1
    default:
        Q_ASSERT_X(false, "QCryptographicHash", "Method not compiled in");
        Q_UNREACHABLE();
        break;
#else
    case Md4:
        md4_update(&d->md4Context, (const unsigned char *)data, length);
        break;
    case Md5:
        MD5Update(&d->md5Context, (const unsigned char *)data, length);
        break;
    case Sha224:
        SHA224Input(&d->sha224Context, reinterpret_cast<const unsigned char *>(data), length);
        break;
    case Sha256:
        SHA256Input(&d->sha256Context, reinterpret_cast<const unsigned char *>(data), length);
        break;
    case Sha384:
        SHA384Input(&d->sha384Context, reinterpret_cast<const unsigned char *>(data), length);
        break;
    case Sha512:
        SHA512Input(&d->sha512Context, reinterpret_cast<const unsigned char *>(data), length);
        break;
    case RealSha3_224:
    case Keccak_224:
        sha3Update(&d->sha3Context, reinterpret_cast<const BitSequence *>(data), quint64(length) * 8);
        break;
    case RealSha3_256:
    case Keccak_256:
        sha3Update(&d->sha3Context, reinterpret_cast<const BitSequence *>(data), quint64(length) * 8);
        break;
    case RealSha3_384:
    case Keccak_384:
        sha3Update(&d->sha3Context, reinterpret_cast<const BitSequence *>(data), quint64(length) * 8);
        break;
    case RealSha3_512:
    case Keccak_512:
        sha3Update(&d->sha3Context, reinterpret_cast<const BitSequence *>(data), quint64(length) * 8);
        break;
#endif
    }
    d->result.clear();
}

QByteArray QCryptographicHash::result() const
{
    if (!d->result.isEmpty())
        return d->result;

    switch (d->method) {
    case Sha1: {
        Sha1State copy = d->sha1Context;
        d->result.resize(20);
        sha1FinalizeState(&copy);
        sha1ToHash(&copy, (unsigned char *)d->result.data());
        break;
    }
#ifdef QT_CRYPTOGRAPHICHASH_ONLY_SHA1
    default:
        Q_ASSERT_X(false, "QCryptographicHash", "Method not compiled in");
        Q_UNREACHABLE();
        break;
#else
    case Md4: {
        md4_context copy = d->md4Context;
        d->result.resize(MD4_RESULTLEN);
        md4_final(&copy, (unsigned char *)d->result.data());
        break;
    }
    case Md5: {
        MD5Context copy = d->md5Context;
        d->result.resize(16);
        MD5Final(&copy, (unsigned char *)d->result.data());
        break;
    }
    case Sha224: {
        SHA224Context copy = d->sha224Context;
        d->result.resize(SHA224HashSize);
        SHA224Result(&copy, reinterpret_cast<unsigned char *>(d->result.data()));
        break;
    }
    case Sha256:{
        SHA256Context copy = d->sha256Context;
        d->result.resize(SHA256HashSize);
        SHA256Result(&copy, reinterpret_cast<unsigned char *>(d->result.data()));
        break;
    }
    case Sha384:{
        SHA384Context copy = d->sha384Context;
        d->result.resize(SHA384HashSize);
        SHA384Result(&copy, reinterpret_cast<unsigned char *>(d->result.data()));
        break;
    }
    case Sha512:{
        SHA512Context copy = d->sha512Context;
        d->result.resize(SHA512HashSize);
        SHA512Result(&copy, reinterpret_cast<unsigned char *>(d->result.data()));
        break;
    }
    case RealSha3_224: {
        d->sha3Finish(224, QCryptographicHashPrivate::Sha3Variant::Sha3);
        break;
    }
    case RealSha3_256: {
        d->sha3Finish(256, QCryptographicHashPrivate::Sha3Variant::Sha3);
        break;
    }
    case RealSha3_384: {
        d->sha3Finish(384, QCryptographicHashPrivate::Sha3Variant::Sha3);
        break;
    }
    case RealSha3_512: {
        d->sha3Finish(512, QCryptographicHashPrivate::Sha3Variant::Sha3);
        break;
    }
    case Keccak_224: {
        d->sha3Finish(224, QCryptographicHashPrivate::Sha3Variant::Keccak);
        break;
    }
    case Keccak_256: {
        d->sha3Finish(256, QCryptographicHashPrivate::Sha3Variant::Keccak);
        break;
    }
    case Keccak_384: {
        d->sha3Finish(384, QCryptographicHashPrivate::Sha3Variant::Keccak);
        break;
    }
    case Keccak_512: {
        d->sha3Finish(512, QCryptographicHashPrivate::Sha3Variant::Keccak);
        break;
    }
#endif
    }
    return d->result;
}
QCryptographicHash::QCryptographicHash(Algorithm method)
    : d(new QCryptographicHashPrivate)
{
    d->method = method;
    reset();
}

void QCryptographicHash::reset()
{
    switch (d->method) {
    case Sha1:
        sha1InitState(&d->sha1Context);
        break;
#ifdef QT_CRYPTOGRAPHICHASH_ONLY_SHA1
    default:
        Q_ASSERT_X(false, "QCryptographicHash", "Method not compiled in");
        Q_UNREACHABLE();
        break;
#else
    case Md4:
        md4_init(&d->md4Context);
        break;
    case Md5:
        MD5Init(&d->md5Context);
        break;
    case Sha224:
        SHA224Reset(&d->sha224Context);
        break;
    case Sha256:
        SHA256Reset(&d->sha256Context);
        break;
    case Sha384:
        SHA384Reset(&d->sha384Context);
        break;
    case Sha512:
        SHA512Reset(&d->sha512Context);
        break;
    case RealSha3_224:
    case Keccak_224:
        sha3Init(&d->sha3Context, 224);
        break;
    case RealSha3_256:
    case Keccak_256:
        sha3Init(&d->sha3Context, 256);
        break;
    case RealSha3_384:
    case Keccak_384:
        sha3Init(&d->sha3Context, 384);
        break;
    case RealSha3_512:
    case Keccak_512:
        sha3Init(&d->sha3Context, 512);
        break;
#endif
    }
    d->result.clear();
}