RSA加密解密与签名验证

            //定义明文和密文变量
            string plaintext = "天道酬勤，厚德载物！";
            string ciphertext = "";

            //产生密钥
            string prikey = "", pubkey = "";
            rsa.RSAKey(out prikey, out pubkey);

            //加密解密过程
            ciphertext = rsa.RSAEncrypt(pubkey, plaintext);
            plaintext = rsa.RSADecrypt(prikey, ciphertext);

            //获取明文Hash值
            byte[] plaintextHash = null;
            rsa.GetHash(plaintext, ref plaintextHash);
            //获取签名密文
            string SignatureCiphertext = null;
            rsa.SignatureFormatter(prikey, plaintextHash, ref SignatureCiphertext);
            //验证
            string verify = rsa.SignatureDeformatter(pubkey, plaintextHash, SignatureCiphertext) ? "OK！没问题" : "NO！内容被篡改了";