C#RSA加密解密(对接PHP)

上篇文章中写的RSA加密是针对C#的，现在外部调用的是PHP，我们平常见到的RSA无论公钥和私钥都是一长串数字,很显然C#生成的XML不是通用的加密。如果外部调用需要处理一下。

一、首先可以去网上找一些生成RSA密钥的工具，生成公钥和私钥。

二、拿到公钥和私钥需要处理一下，转换个XML格式的公钥和私钥

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公钥格式转换，java->.net
        /// </summary>
        /// <param name="publicKey">java生成的公钥</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位的公钥和私钥，这里加密和解密也要用2048位的

 #region RSA的加密函数

        //##############################################################################
        //RSA 方式加密
        //说明KEY必须是XML的行式,返回的是字符串
        //在有一点需要说明！！该加密方式有 长度 限制的！！
        //##############################################################################
        //RSA的加密函数 string
        public static string RSAEncrypt(string xmlPublicKey, string m_strEncryptString)
        {
            byte[] PlainTextBArray;
            byte[] CypherTextBArray;
            string Result;
            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            rsa.FromXmlString(xmlPublicKey);
            PlainTextBArray = (new UTF8Encoding()).GetBytes(m_strEncryptString);
            CypherTextBArray = rsa.Encrypt(PlainTextBArray, false);
            Result = Convert.ToBase64String(CypherTextBArray);
            return Result;
        }

        #endregion

        #region RSA的解密函数
        //RSA的解密函数 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();
            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！"
            });
        }