Question

我有一个带有消息和私钥的字符串。我需要编写一些可以使用RSASSA-PKCS1-v1_5签名对此字符串进行签名的C＃代码。

关于我应该从哪里开始寻求完成这项工作，您有任何提示或建议吗？ .NET中或现有库中是否有现有API来执行此操作？

Answer 1

这是一个如何操作的示例，您可以使用代码中所需的更改来实现它（示例来自MSDN Site：

using System;
using System.Security.Cryptography;
using Org.BouncyCastle.OpenSsl;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.Crypto.Parameters;

class RSASample
{
   const string PubKeyFile = @"c:\encrypt\fileWithKey.pem";
        const string keyName = "Key01";
        CspParameters cspp = new CspParameters();
        RSAParameters RSAKeyInfo = new RSAParameters();

        Org.BouncyCastle.Utilities.IO.Pem.PemObject po = null;
        using (StreamReader sr = new StreamReader(PubKeyFile))
        {
            Org.BouncyCastle.OpenSsl.PemReader pr = new Org.BouncyCastle.OpenSsl.PemReader(reader);
            po = pr.ReadPemObject();
        }

        RSAKeyInfo.Modulus = po.Content;
        cspp.KeyContainerName = keyName;
         try
         {
             //Create a new instance of RSACryptoServiceProvider. 
             using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(cspp))
             {
                 rsa.PersistKeyInCsp = true;
                 rsa.ImportParameters(RSAKeyInfo);
                 //The hash to sign. 
                 byte[] hash;
                 using (SHA256 sha256 = SHA256.Create())
                 {
                     byte[] data = new byte[] { 59, 4, 248, 102, 77, 97, 142, 201, 210, 12, 224, 93, 25, 41, 100, 197, 213, 134, 130, 135 };
                     hash = sha256.ComputeHash(data);
                 }


                 //Create an RSASignatureFormatter object and pass it the  
                 //RSACryptoServiceProvider to transfer the key information.
                 RSAPKCS1SignatureFormatter RSAFormatter = new RSAPKCS1SignatureFormatter(rsa);

                 //Set the hash algorithm to SHA256.
                 RSAFormatter.SetHashAlgorithm("SHA256");

                 //Create a signature for HashValue and return it. 
                 byte[] SignedHash = RSAFormatter.CreateSignature(hash);
             }

         }
         catch (CryptographicException e)
         {
             Console.WriteLine(e.Message);
         }
}

需要在c＃中使用RSASSA-PKCS1-v1_5签名对字符串进行签名

1 个答案: