C#RSA加密解密(對接PHP)

上篇文章中寫的RSA加密是針對C#的，現在外部調用的是PHP，我們平常見到的RSA無論公鑰和私鑰都是一長串數字,很顯然C#生成的XML不是通用的加密。如果外部調用需要處理一下。

一、首先可以去網上找一些生成RSA密鑰的工具，生成公鑰和私鑰。

二、拿到公鑰和私鑰需要處理一下，轉換個XML格式的公鑰和私鑰

public class BouncyCastle
    {
        public static string RSAPrivateKeyJava2DotNet(string privateKey)
        {
            RsaPrivateCrtKeyParameters privateKeyParam = (RsaPrivateCrtKeyParameters)PrivateKeyFactory.CreateKey(Convert.FromBase64String(privateKey));

            return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent><P>{2}</P><Q>{3}</Q><DP>{4}</DP><DQ>{5}</DQ><InverseQ>{6}</InverseQ><D>{7}</D></RSAKeyValue>",
                Convert.ToBase64String(privateKeyParam.Modulus.ToByteArrayUnsigned()),
                Convert.ToBase64String(privateKeyParam.PublicExponent.ToByteArrayUnsigned()),
                Convert.ToBase64String(privateKeyParam.P.ToByteArrayUnsigned()),
                Convert.ToBase64String(privateKeyParam.Q.ToByteArrayUnsigned()),
                Convert.ToBase64String(privateKeyParam.DP.ToByteArrayUnsigned()),
                Convert.ToBase64String(privateKeyParam.DQ.ToByteArrayUnsigned()),
                Convert.ToBase64String(privateKeyParam.QInv.ToByteArrayUnsigned()),
                Convert.ToBase64String(privateKeyParam.Exponent.ToByteArrayUnsigned()));
        }
        /// <summary>
        /// RSA公鑰格式轉換，java->.net
        /// </summary>
        /// <param name="publicKey">java生成的公鑰</param>
        /// <returns></returns>
        public static string RSAPublicKeyJava2DotNet(string publicKey)
        {
            RsaKeyParameters publicKeyParam = (RsaKeyParameters)PublicKeyFactory.CreateKey(Convert.FromBase64String(publicKey));
            return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent></RSAKeyValue>",
                Convert.ToBase64String(publicKeyParam.Modulus.ToByteArrayUnsigned()),
                Convert.ToBase64String(publicKeyParam.Exponent.ToByteArrayUnsigned()));
        }
    }

三、生成工具生成的是2048位的公鑰和私鑰，這里加密和解密也要用2048位的

 #region RSA的加密函數

        //############################################################################## 
        //RSA 方式加密 
        //說明KEY必須是XML的行式,返回的是字符串 
        //在有一點需要說明！！該加密方式有 長度 限制的！！ 
        //############################################################################## 
        //RSA的加密函數 string
        public static string RSAEncrypt(string xmlPublicKey, string m_strEncryptString)
        {
            byte[] PlainTextBArray;
            byte[] CypherTextBArray;
            string Result;
            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(2048);
            rsa.FromXmlString(xmlPublicKey);
            PlainTextBArray = (new UTF8Encoding()).GetBytes(m_strEncryptString);
            CypherTextBArray = rsa.Encrypt(PlainTextBArray, false);
            Result = Convert.ToBase64String(CypherTextBArray);
            return Result;
        }
      
        #endregion

        #region RSA的解密函數 
        //RSA的解密函數 string
        public static string RSADecrypt(string xmlPrivateKey, string m_strDecryptString)
        {
            xmlPrivateKey = BouncyCastle.RSAPrivateKeyJava2DotNet(xmlPrivateKey);
            byte[] PlainTextBArray;
            byte[] DypherTextBArray;
            string Result;
            System.Security.Cryptography.RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(2048);
            rsa.FromXmlString(xmlPrivateKey);
            PlainTextBArray = Convert.FromBase64String(m_strDecryptString);
            DypherTextBArray = rsa.Decrypt(PlainTextBArray, false);

            Result = (new UTF8Encoding()).GetString(DypherTextBArray);
            return Result;

        }
      
        #endregion

四、加密和解密

        /// <summary>
        /// 加密
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        [HttpPost]
        public IHttpActionResult RSAEncrypt(RSARequest model)
        {
            string publicKey = BouncyCastle.RSAPublicKeyJava2DotNet(model.XmlPublicKey);
            string encryptionStr = RSACryption.RSAEncrypt(publicKey, model.StrEncryptString);
            return Ok(new
            {
                code = ResultCode.Success,
                encryptionStr = encryptionStr,
                message = "加密成功！"
            });
        }

        /// <summary>
        ///解密
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        [HttpPost]
        public IHttpActionResult RSADecrypt(RSADecryptRequest model)
        {
            string str_Plain_Text = RSACryption.RSADecrypt(model.XmlPrivateKey, model.StrDecryptString);
            return Ok(new
            {
                code = ResultCode.Success,
                encryptionStr = str_Plain_Text,
                message = "解密成功！"
            });
        }