C#：如何使用BouncyCastle.Crypto实现MD5withRSA

╰半夏微凉° 2023-07-06 13:27 35阅读 0赞

下面提供一个使用BouncyCastle.Crypto实现MD5withRSA的一个例子，以备日后使用：

using Org.BouncyCastle.Crypto;
    using Org.BouncyCastle.Security;
    using System;
    using System.Collections.Generic;
    using System.Text;
    
    namespace SignVerify
    {
        class CryptoUtil
        {
            public static Encoding encoding = Encoding.UTF8;
            public static string SignerSymbol = "MD5withRSA";
    
            private static AsymmetricKeyParameter CreateKEY(bool isPrivate, string key)
            {
                byte[] keyInfoByte = Convert.FromBase64String(key);
    
                if (isPrivate)
                    return PrivateKeyFactory.CreateKey(keyInfoByte);
                else
                    return PublicKeyFactory.CreateKey(keyInfoByte);
            }
    
            public static string Sign(string content, string privatekey)
            {
                ISigner sig = SignerUtilities.GetSigner(SignerSymbol);
    
                sig.Init(true, CreateKEY(true, privatekey));
    
                var bytes = encoding.GetBytes(content);
    
                sig.BlockUpdate(bytes, 0, bytes.Length);
                byte[] signature = sig.GenerateSignature();
    
    
                /* Base 64 encode the sig so its 8-bit clean */
                var signedString = Convert.ToBase64String(signature);
    
                return signedString;
            }
    
            public static bool Verify(string content, string signData, string publickey)
            {
                ISigner signer = SignerUtilities.GetSigner(SignerSymbol);
    
                signer.Init(false, CreateKEY(false, publickey));
    
                var expectedSig = Convert.FromBase64String(signData);
    
                /* Get the bytes to be signed from the string */
                var msgBytes = encoding.GetBytes(content);
    
                /* Calculate the signature and see if it matches */
                signer.BlockUpdate(msgBytes, 0, msgBytes.Length);
                return signer.VerifySignature(expectedSig);
            }
        }
    }

参考文档：  
[Sign data with MD5WithRSA from .Pem/.Pkcs8 keyfile in C\#][Sign data with MD5WithRSA from .Pem_.Pkcs8 keyfile in C]  
[C\# 实现Java MD5withRsa 使用公钥，私钥加解密][C_ _Java MD5withRsa]

[Sign data with MD5WithRSA from .Pem_.Pkcs8 keyfile in C]: https://stackoverflow.com/questions/2274836/sign-data-with-md5withrsa-from-pem-pkcs8-keyfile-in-c-sharp
[C_ _Java MD5withRsa]: https://blog.csdn.net/qq_36894527/article/details/103720296