C# -- RSA加密与解密

1.  rsa加密与解密  --  使用公钥加密、私钥解密

    public class rsatool
    {
        public string encrypt(string strtext, string strpublickey)
        {
            rsacryptoserviceprovider rsa = new rsacryptoserviceprovider();
            rsa.fromxmlstring(strpublickey);

            byte[] bytetext = encoding.utf8.getbytes(strtext);
            byte[] byteentry = rsa.encrypt(bytetext, false);

            return convert.tobase64string(byteentry);
        }


        public string decrypt(string strentrytext,string strprivatekey)
        {
            rsacryptoserviceprovider rsa = new rsacryptoserviceprovider();
            rsa.fromxmlstring(strprivatekey);

            byte[] byteentry = convert.frombase64string(strentrytext);
            byte[] bytetext = rsa.decrypt(byteentry, false);

            return encoding.utf8.getstring(bytetext);
        }

        public dictionary<string,string> getkey()
        {
            dictionary<string, string> dictkey = new dictionary<string, string>();
            rsacryptoserviceprovider rsa = new rsacryptoserviceprovider();

            dictkey.add("publickey", rsa.toxmlstring(false));
            dictkey.add("privatekey", rsa.toxmlstring(true));

            return dictkey;
        }
    }

测试：

            rsatool myrsa = new rsatool();
            dictionary<string, string> dictk = new dictionary<string, string>();
            dictk = myrsa.getkey();

            string strtext = "123456";
            console.writeline("要加密的字符串是：{0}", strtext);

            string str1 = myrsa.encrypt("123456", dictk["publickey"]);
            console.writeline("加密后的字符串：{0}", str1);

            string str2 = myrsa.decrypt(str1, dictk["privatekey"]);
            console.writeline("解密后的字符串：{0}", str2);

 

 

2.  rsa加密与解密  --  使用同一个密钥容器进行加密与解密

    public class rsatoolx
    {
        public string encrypt(string strtext)
        {
            cspparameters csapars = new cspparameters();
            csapars.keycontainername = "test001";

            rsacryptoserviceprovider rsa = new rsacryptoserviceprovider(csapars);

            byte[] bytetext = encoding.utf8.getbytes(strtext);
            byte[] byteentry = rsa.encrypt(bytetext, false);

            return convert.tobase64string(byteentry);
        }


        public string decrypt(string strentrytext)
        {
            cspparameters csapars = new cspparameters();
            csapars.keycontainername = "test001";

            rsacryptoserviceprovider rsa = new rsacryptoserviceprovider(csapars);

            byte[] byteentry = convert.frombase64string(strentrytext);
            byte[] bytetext = rsa.decrypt(byteentry, false);

            return encoding.utf8.getstring(bytetext);
        }
    }

测试 ：

            rsatoolx myrsa = new rsatoolx();

            string strtext = "123456";
            console.writeline("要加密的字符串是：{0}", strtext);

            string str1 = myrsa.encrypt("123456");
            console.writeline("加密后的字符串：{0}", str1);

            string str2 = myrsa.decrypt(str1);
            console.writeline("解密后的字符串：{0}", str2);