QT+openssl实现以下Java代码 并写出pro文件public static String decryptString str String privateKey throws Exception 64位解码加密后的字符串-----解码字符串UTF-8类型 byte inputByte = Base64decodeBase64strgetBytesUTF-8;

对于此Java代码，在QT中可以使用openssl库进行实现。在.pro文件中，需要添加以下内容：

LIBS += -lssl -lcrypto

接下来，我们可以使用以下代码实现Java代码的功能：

QString decrypt(QString str, QString privateKey) { QByteArray inputByte = QByteArray::fromBase64(str.toUtf8()); QByteArray decoded = QByteArray::fromBase64(privateKey.toUtf8());

const unsigned char* pkcs8Key = (const unsigned char*) decoded.constData();
RSA* rsa = d2i_RSAPrivateKey(NULL, &pkcs8Key, decoded.length());
if (rsa == NULL) {
    qDebug() << "Error: RSA private key decode failed";
    return "";
}

QByteArray resultBytes;
const int MAX_ENCRYPT_BLOCK = 128;
int inputLength = inputByte.length();
int offSet = 0;
while (inputLength - offSet > 0) {
    QByteArray cache;
    int length = (inputLength - offSet > MAX_ENCRYPT_BLOCK) ? MAX_ENCRYPT_BLOCK : inputLength - offSet;
    cache.resize(length);
    memcpy(cache.data(), inputByte.constData() + offSet, length);
    unsigned char* output = new unsigned char[RSA_size(rsa)];
    int outlen = RSA_private_decrypt(length, (const unsigned char*) cache.constData(), output, rsa, RSA_PKCS1_PADDING);
    if (outlen < 0) {
        qDebug() << "Error: RSA decryption failed";
        RSA_free(rsa);
        return "";
    }
    resultBytes.append((char*) output, outlen);
    delete[] output;
    offSet += length;
}

RSA_free(rsa);
return QString::fromUtf8(resultBytes.constData(), resultBytes.length());