C# RSA根据modulus,exponent生成公钥

很多站点在数据提交的时候都会进行RSA加密，我们在js中可以得到n和e

长这样

var n = "D1EC51E7CEA07CB3233ADA6009006EF3EBF89EFD5CF77AAD211051D008077DC7142872B8C36EE971D4B368C79C13A6BBCB89B551A8308C68F71764C1519DEAD90B560E126B365375700CC5A2E6CF81E2A0FEEA31B53C1F8D3F3AE522DF9AB19B5C0C391D997D6DE56807328B9BBD5F6D08EA47614060177E12F65BDB95D5D6E3";
var e = "10001";

　　

        public static byte[] Hex2Byte(string byteStr)
        {
            try
            {
                byteStr = byteStr.ToUpper().Replace(" ", "");
                int len = byteStr.Length / 2;
                byte[] data = new byte[len];
                for (int i = 0; i < len; i++)
                {
                    data[i] = Convert.ToByte(byteStr.Substring(i * 2, 2), 16);

                }
                return data;
            }
            catch (Exception ex)
            {
                return new byte[] { };
            }
        }

　　n和e经过Hex2Byte

Convert.ToBase64String(n);

Convert.ToBase64String(n);

我们得到新值

n="0exR586gfLMjOtpgCQBu8+v4nv1c93qtIRBR0AgHfccUKHK4w27pcdSzaMecE6a7y4m1UagwjGj3F2TBUZ3q2QtWDhJrNlN1cAzFoubPgeKg/uoxtTwfjT865SLfmrGbXAw5HZl9beVoBzKLm71fbQjqR2FAYBd+EvZb25XV1uM=";
e="ABAQ";

　　自己拼接成xml格式的publickey

<RSAKeyValue>
    <Modulus>        0exR586gfLMjOtpgCQBu8+v4nv1c93qtIRBR0AgHfccUKHK4w27pcdSzaMecE6a7y4m1UagwjGj3F2TBUZ3q2QtWDhJrNlN1cAzFoubPgeKg/uoxtTwfjT865SLfmrGbXAw5HZl9beVoBzKLm71fbQjqR2FAYBd+EvZb25XV1uM=
    </Modulus>
    <Exponent>
        AQAB
    </Exponent>
</RSAKeyValue>

　　通过在线格式转换转成pem格式

http://superdry.apphb.com/tools/online-rsa-key-converter

你熟悉的公钥来咯

-----BEGIN PUBLIC KEY-----
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDR7FHnzqB8syM62mAJAG7z6/ie
/Vz3eq0hEFHQCAd9xxQocrjDbulx1LNox5wTprvLibVRqDCMaPcXZMFRnerZC1YO
Ems2U3VwDMWi5s+B4qD+6jG1PB+NPzrlIt+asZtcDDkdmX1t5WgHMoubvV9tCOpH
YUBgF34S9lvbldXW4wIDAQAB
-----END PUBLIC KEY-----

　　C#RSA算法实现+如何将公钥为XML格式转为PEM格式