UWP 相当于 SHA1 MessageDigest 的 cipher.doFinal()

Question

以下是安卓代码：

MessageDigest md = MessageDigest.getInstance("SHA1");//No I18N
            byte[] messageDigest = md.digest(plainText.getBytes("UTF-8"));
            PrivateKeyEntry pKey = (PrivateKeyEntry) Application.getInstance(appcontext)
                    .getKeyStore()
                    .getEntry(KEY_STORE_ALIAS, null);
            Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
            cipher.init(Cipher.ENCRYPT_MODE, pKey.getPrivateKey());
            byte[] encBytes = cipher.doFinal(messageDigest);
String encryptedData = new String(Base64.encode(encBytes, Base64.DEFAULT), "UTF-8");
return encryptedData;

以下是 uwp 代码：

IBuffer dataBuffer = Encoding.UTF8.GetBytes(plainText).AsBuffer();
            IBuffer KeyPairBuffer = Convert.FromBase64String(keyPairString).AsBuffer();

            AsymmetricKeyAlgorithmProvider asymmetricKeyAlgorithm = AsymmetricKeyAlgorithmProvider.OpenAlgorithm(AsymmetricAlgorithmNames.RsaSignPkcs1Sha1);
            CryptographicKey cryptographicKey = asymmetricKeyAlgorithm.ImportKeyPair(KeyPairBuffer);
            HashAlgorithmProvider hashAlgorithm = HashAlgorithmProvider.OpenAlgorithm(HashAlgorithmNames.Sha1);
            IBuffer hashedBuffer = hashAlgorithm.HashData(dataBuffer);
            System.Diagnostics.Debug.WriteLine(Convert.ToBase64String(hashedBuffer.ToArray()));
            var buffer = CryptographicEngine.SignHashedData(cryptographicKey, hashedBuffer);
            return Convert.ToBase64String((buffer.ToArray()));'

安卓代码工作正常，但 UWP 代码无法正常工作。提前感谢您的帮助。

Answer 1

我得到了不同的异常，例如错误：签名验证失败，javax.crypto.BadPaddingException：解密错误，javax.crypto.IllegalBlockSizeException：数据不得超过256字节 -

我在 UWP 中测试了代码片段，无法重现您的问题。由于您的代码片段不完整，以下是可以在我这边成功运行的完整代码片段。

string plainText = "test";
IBuffer dataBuffer = Encoding.UTF8.GetBytes(plainText).AsBuffer();
//IBuffer KeyPairBuffer = Convert.FromBase64String(keyPairString).AsBuffer();  
AsymmetricKeyAlgorithmProvider asymmetricKeyAlgorithm = AsymmetricKeyAlgorithmProvider.OpenAlgorithm(AsymmetricAlgorithmNames.RsaSignPkcs1Sha1);
CryptographicKey cryptographicKey = asymmetricKeyAlgorithm.CreateKeyPair(512);
//CryptographicKey cryptographicKey = asymmetricKeyAlgorithm.ImportKeyPair(buffKeyPair);
HashAlgorithmProvider hashAlgorithm = HashAlgorithmProvider.OpenAlgorithm(HashAlgorithmNames.Sha1);
IBuffer hashedBuffer = hashAlgorithm.HashData(dataBuffer);
System.Diagnostics.Debug.WriteLine(Convert.ToBase64String(hashedBuffer.ToArray()));
var buffer = CryptographicEngine.SignHashedData(cryptographicKey, hashedBuffer);

特别是，您在这里提到的异常看起来像 Java 异常，而不是 c#。因此，请首先确保哪个代码行抛出了异常。然后检查keyPairString是否正确。请注意，典型的密钥大小为 512、1024、2048 或 4096 位。

有关更多详细信息，请参阅官方教程。