C# 等效的 Java 加密代码。

huangapple
go评论189阅读模式
英文:

java cipher to c# equivalent

问题

以下是您提供的内容的翻译部分：

原始 Java 代码段：

  1. try {
  2.   cipher = Cipher.getInstance("RSA/None/PKCS1Padding", "SC");
  3. } catch (SecurityException se) {
  4.   // workaround for tests
  5.   Log.i("Moip SDK", "No SC provider, running test profile");
  6.   cipher = Cipher.getInstance("RSA");
  7. }
  9. BufferedReader pemReader = null;
  10. pemReader = new BufferedReader(new InputStreamReader(
  11.   new ByteArrayInputStream(publicKey.getBytes("UTF-8"))));
  13. StringBuffer content = new StringBuffer();
  14. String line = null;
  15. while ((line = pemReader.readLine()) != null) {
  16.   if (line.indexOf("-----BEGIN PUBLIC KEY-----") != -1) {
  17.     while ((line = pemReader.readLine()) != null) {
  18.       if (line.indexOf("-----END PUBLIC KEY") != -1) {
  19.         break;
  20.       }
  21.       content.append(line.trim());
  22.     }
  23.     break;
  24.   }
  25. }
  26. KeyFactory keyFactory = KeyFactory.getInstance("RSA");
  27. cipher.init(Cipher.ENCRYPT_MODE, keyFactory.generatePublic(new X509EncodedKeySpec(Base64.decode(content.toString(), Base64.DEFAULT))));
  28. byte[] cipherText = cipher.doFinal(toHash().getBytes());
  30. return Base64.encodeToString(cipherText, Base64.DEFAULT);

您创建的类似代码段，用于在 C# 中实现相同的功能：

  1. private string Payload(string number, string expirationMonth, string expirationYear, string cvc) {
  2.   return string.Join("&",
  3.     new List<string> {
  4.       $"number={number}",
  5.       $"cvc={cvc}",
  6.       $"expirationMonth={expirationMonth}",
  7.       $"expirationYear={expirationYear}",
  8.     }
  9.   );
  10. }
  12. private string Encrypt(string key, string payload) {
  13.   var publicKey = $"<RSAKeyValue><Modulus>{key}</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";
  14.   var rsa = new RSACryptoServiceProvider(2048);
  15.   rsa.FromXmlString(publicKey);
  16.   var encryptedData = rsa.Encrypt(Encoding.UTF8.GetBytes(payload), RSAEncryptionPadding.Pkcs1);
  17.   rsa.Dispose();
  19.   return Convert.ToBase64String(encryptedData);
  20. }
  22. var payload = Payload(number, expirationMonth, expirationYear, cvc);
  23. hash = Encrypt(ClientManager.Environment.publicKeyCreditCard, payload);

请注意，为了保持代码的一致性，我已将注释和不相关的细节从翻译中删除。

英文:

I am very grateful with any help. I am trying to convert a rsa cryptor java implementation to c#. I need to encrypt credit card data. The platform i use provides cryptography SDK for javascript and android, but I need a C# implementation.

  1.     try {
  2.       cipher = Cipher.getInstance(&quot;RSA/None/PKCS1Padding&quot;, &quot;SC&quot;);
  3.     } catch (SecurityException se) {
  4.       //workaround for tests
  5.       Log.i(&quot;Moip SDK&quot;, &quot;No SC provider, running test profile&quot;);
  6.       cipher = Cipher.getInstance(&quot;RSA&quot;);
  7.     }
  9.     BufferedReader pemReader = null;
  10.     pemReader = new BufferedReader(new InputStreamReader(
  11.       new ByteArrayInputStream(publicKey.getBytes(&quot;UTF-8&quot;))));
  13.     StringBuffer content = new StringBuffer();
  14.     String line = null;
  15.     while ((line = pemReader.readLine()) != null) {
  16.       if (line.indexOf(&quot;-----BEGIN PUBLIC KEY-----&quot;) != -1) {
  17.         while ((line = pemReader.readLine()) != null) {
  18.           if (line.indexOf(&quot;-----END PUBLIC KEY&quot;) != -1) {
  19.             break;
  20.           }
  21.           content.append(line.trim());
  22.         }
  23.         break;
  24.       }
  25.     }
  26.     KeyFactory keyFactory = KeyFactory.getInstance(&quot;RSA&quot;);
  27.     cipher.init(Cipher.ENCRYPT_MODE, keyFactory.generatePublic(new X509EncodedKeySpec(Base64.decode(content.toString(), Base64.DEFAULT))));
  28.     byte[] cipherText = cipher.doFinal(toHash().getBytes());
  30.     return Base64.encodeToString(cipherText, Base64.DEFAULT);

The code I created looking at the implementation in java, it works but fails to be decrypted on the platform, I must be forgetting something. My implementation:

  1.   private string Payload(string number, string expirationMonth, string expirationYear, string cvc) {
  2.     return String.Join(
  3.       &quot;&amp;&quot;,
  4.       new List&lt;string&gt; {
  5.         $&quot;number={number}&quot;,
  6.         $&quot;cvc={cvc}&quot;,
  7.         $&quot;expirationMonth={expirationMonth}&quot;,
  8.         $&quot;expirationYear={expirationYear}&quot;,
  9.       }
  10.     );
  11.   }
  13.   private string Encrypt(string key, string payload) {
  14.     var publicKey = $&quot;&lt;RSAKeyValue&gt;&lt;Modulus&gt;{key}&lt;/Modulus&gt;&lt;Exponent&gt;AQAB&lt;/Exponent&gt;&lt;/RSAKeyValue&gt;&quot;;
  15.     var rsa = new RSACryptoServiceProvider(2048);
  16.     rsa.FromXmlString(publicKey);
  17.     var encryptedData = rsa.Encrypt(Encoding.UTF8.GetBytes(payload), RSAEncryptionPadding.Pkcs1);
  18.     rsa.Dispose();
  20.     return Convert.ToBase64String(encryptedData);
  21.   }
  24. var payload = Payload(number, expirationMonth, expirationYear, cvc);
  25. hash = Encrypt(ClientManager.Environment.publicKeyCreditCard, payload);

答案1

得分: 0

欢迎来到Stack Overflow。我运行了你的代码，在Java和C#两个平台上都成功地进行了加密和解密。

因此在我看来，当在C#上进行加密时解密失败的唯一原因是你没有正确地转换公钥。

我建议使用一个在线转换工具，比如https://superdry.apphb.com/tools/online-rsa-key-converter （因为这是公钥）。只需要将公钥复制到下方的输入文本区域“PEM to XML”中，就像这个（这是一个不安全的 512 位RSA密钥，所以会比你的密钥更短）：

  1. -----BEGIN PUBLIC KEY-----
  2. MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAJn4LYaoLyuT+pD9NKI8wOvPrRjMIxGn
  3. HbqIxUrpGsyj162fEOV4836oCZg0N8HFnt4Vivdjt8/7ZgLjeOygNGUCAwEAAQ==
  4. -----END PUBLIC KEY-----

然后点击“Convert”按钮 - 在下面你会得到公钥的xml格式：

  1. &lt;RSAKeyValue&gt;&lt;Modulus&gt;mfgthqgvK5P6kP00ojzA68+tGMwjEacduojFSukazKPXrZ8Q5XjzfqgJmDQ3wcWe3hWK92O3z/tmAuN47KA0ZQ==&lt;/Modulus&gt;&lt;Exponent&gt;AQAB&lt;/Exponent&gt;&lt;/RSAKeyValue&gt;

你需要注意<Exponent>的值 - 大多数情况下是“AQAB”，但如果你收到其他值，就必须在C#中调整你的源代码。

英文:

Welcome to Stackoverflow. I run your codes and I could encrypt and decrypt on both platforms (Java & C#) successfully.

So in my eyes the only reason why decryption fails when doing encryption on C# is that you didn't convert the public key correctly.

I recommend to use (as it is the pub key) an online converter like https://superdry.apphb.com/tools/online-rsa-key-converter.

Just copy the public key in the lower input text area "PEM to XML" like this one (it's an unsecure 512 bit RSA-key so it will be shorter than your one):

  1. -----BEGIN PUBLIC KEY-----&quot; +
  2. MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAJn4LYaoLyuT+pD9NKI8wOvPrRjMIxGn
  3. HbqIxUrpGsyj162fEOV4836oCZg0N8HFnt4Vivdjt8/7ZgLjeOygNGUCAwEAAQ==
  4. -----END PUBLIC KEY-----

and press "Convert" - below you get the public key in xml-format:

  1. &lt;RSAKeyValue&gt;&lt;Modulus&gt;mfgthqgvK5P6kP00ojzA68+tGMwjEacduojFSukazKPXrZ8Q5XjzfqgJmDQ3wcWe3hWK92O3z/tmAuN47KA0ZQ==&lt;/Modulus&gt;&lt;Exponent&gt;AQAB&lt;/Exponent&gt;&lt;/RSAKeyValue&gt;

The partial key that you have to present to your C# method is after Modulus:

  1. mfgthqgvK5P6kP00ojzA68+tGMwjEacduojFSukazKPXrZ8Q5XjzfqgJmDQ3wcWe3hWK92O3z/tmAuN47KA0ZQ==

You should have an eye on the <Exponent> value - in most times it is "AQAB" but in case you receive another value you have to adjust your source code in C#.

huangapple
  • 本文由 发表于 2020年8月23日 20:56:08
  • 转载请务必保留本文链接：https://go.coder-hub.com/63547220.html
  • c#
  • encryption
  • java
  • rsa
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