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   源码介绍

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        /// <summary>    
        /// RSA私钥格式转换，java->.net    
        /// </summary>    
        /// <param name="privateKey">java生成的RSA私钥</param>    
        /// <returns></returns>   
        public 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>
        /// 签名
        /// </summary>
        /// <param name="str"></param>
        /// <param name="privateKey"></param>
        /// <returns></returns>
        public string Sign(string str)
        {
            string privateKey = "MIICdgIBADANBgkqhkiG9w0BAQEFAASCAmAwggJcAgEAAoGBAMFn7YC3lankHvpQTq9Bt5I0db4ySUzPskzDIB l2IQG3B sHLMrLDMp78MBcU6yEGB6AmxYcY PXXE2aju22h/4jG5An9dQKcHVBYTI4pbAh22UQvUQnLGrpo2 Dr37D/Hvv rF32HhARgXb5QKncpuc6h4nMgNH2fAkZ2ljFu9AgMBAAECgYBOwMDnDto0aZ1rk9PWbU4QjKf9IIDUdCZIN5QXDvMRH7H2e6DcHBJNayAkKaw3vS4J uSNtZ3YNSp5dQzg7931PQyOAW9d0W6bLLxI9SrKQIy1BzjFysmfqS8l5X6gr1jWCJCzrJg zZwhSeLmwpFOA8sXL60dbnOlxMlzXJUEgQJBAO ZbakF8bQr YFVAySFpW5jFIitqIErseCv76J8GTBr69MibXzS5i39CWly2ocs22wj7QucLdbZqZEJAeoyAa0CQQDOpQoDPbvt80NCLYG5WuUzm5MB0cOOgcN2yUVAMaztPOKpYGEgfXnSB LNB0o9PRZUeZFOEkzvQR3wdQ5oI6RRAkEApaWgX/PBF/wzAkxA4PYY2klbv a3kZ4g2yMnfGFplMV4A79QjLTN EtxP1rtY/kKNihcUOOH XsANUpR7ZTm/QJATM5tDU1Z15SucB H8wQE4wy1NFzqKcKziyg NCECnF8gBEKNd00MBXPm6bwG7QISla1lw7XroJX8cc6gXza4MQJAKGVDccof8R5W9Po4AW0TX8bhJCXyg9v5n9pPQtV9NJsHaFFqwnMcTpcb0OeKK47ea97FlUu/X6h1Q37r Z6kSw==";
            privateKey = RSAPrivateKeyJava2DotNet(privateKey);
            //根据需要加签时的哈希算法转化成对应的hash字符节
            byte[] bt = Encoding.GetEncoding("utf-8").GetBytes(str);
            var sha256 = new SHA256CryptoServiceProvider();
            byte[] rgbHash = sha256.ComputeHash(bt);

            RSACryptoServiceProvider key = new RSACryptoServiceProvider();
            key.FromXmlString(privateKey);
            RSAPKCS1SignatureFormatter formatter = new RSAPKCS1SignatureFormatter(key);
            formatter.SetHashAlgorithm("SHA256");//此处是你需要加签的hash算法，需要和上边你计算的hash值的算法一致，不然会报错。
            byte[] inArray = formatter.CreateSignature(rgbHash);
            return Convert.ToBase64String(inArray);
        }