相关疑难解决方法(0)

我试图了解Java java.security.Signature类的功能.如果我计算SHA1消息摘要,然后使用RSA加密该摘要,我得到一个不同的结果,要求Signature类签署相同的东西:

// Generate new key
KeyPair keyPair = KeyPairGenerator.getInstance("RSA").generateKeyPair();
PrivateKey privateKey = keyPair.getPrivate();
String plaintext = "This is the message being signed";

// Compute signature
Signature instance = Signature.getInstance("SHA1withRSA");
instance.initSign(privateKey);
instance.update((plaintext).getBytes());
byte[] signature = instance.sign();

// Compute digest
MessageDigest sha1 = MessageDigest.getInstance("SHA1");
byte[] digest = sha1.digest((plaintext).getBytes());

// Encrypt digest
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, privateKey);
byte[] cipherText = cipher.doFinal(digest);

// Display results
System.out.println("Input data: " + plaintext);
System.out.println("Digest: " + bytes2String(digest));
System.out.println("Cipher text: " + bytes2String(cipherText)); …

我试图获得相当于以下C#方法:

public byte[] SignHash(byte[] btHash, string SN)
{
    string strSignature = string.Empty;
    X509Store x509store = null;
    x509store = new X509Store(StoreLocation.CurrentUser);
    x509store.Open(OpenFlags.ReadOnly);

    foreach (X509Certificate2 x509 in x509store.Certificates)
    {
        if (x509.SerialNumber.ToLower().Contains(SN.ToLower()))
        {
            byte[] btSignature = null;
            using (RSACryptoServiceProvider key = new RSACryptoServiceProvider())
            {

                key.FromXmlString(x509.PrivateKey.ToXmlString(true));
                return key.SignHash(btHash, CryptoConfig.MapNameToOID("SHA256"));
            }
            break;
        }
    }
    return null;

}

用Java语言.实际上,我来到这里:

private static String SignHash(final byte[] btHash, String SerialNumber) throws Exception
{
    KeyStore ks = null;
    ks = KeyStore.getInstance("Windows-MY");
    ks.load(null, null);

    Boolean noValidCertificate = true;

    Enumeration<String> en = …