【絕跡篇】C#RSA演算法實現

當下最流行的RSA密碼編譯演算法,只有公開金鑰和私密金鑰同時擁有才能破解加密資訊,RSA密碼編譯演算法的出現有利於資料安全性傳輸

1.C#中內建RSACryptoServiceProvider類可以讓你很好的產生XML格式的公開金鑰和私密金鑰,兩句代碼就搞定

2.但是產生的XML格式前端不能很好的利用和讀懂,所以在產生的XML格式裡需要轉換成PEM格式,這樣才能直接Copy到驗證工具裡加密解密,非常方便
首先,我們先匯入一個第三方庫,因為下面涉及到的轉碼都是需要依賴這個庫來實現,匯入操作如下

控制台裡輸入
PM > Install-Package BouncyCastle
匯入到引用裡面

3.好了,下面就是純程式碼實現了,目的就是將XML格式轉換為PEM格式,無論公開金鑰還是私密金鑰,不羅嗦直接代碼走起

        static void Main(string[] args)        {            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();            string xmlPrivateKey = rsa.ToXmlString(true);//XML密鑰            string pemPrivateKey = Xml2PemPrivate(xmlPrivateKey, "F:/privatePEM.txt");//PEM密鑰            string xmlPublicKey = rsa.ToXmlString(false);//XML公開金鑰            string pemPublicKey = Xml2PemPublic(xmlPublicKey, "F:/publicPEM.txt");//PEM密鑰        }        /// <summary>        ///  XML格式公開金鑰轉PEM格式公開金鑰        /// </summary>        /// <param name="xml">XML格式的公開金鑰</param>        /// <param name="saveFile">儲存檔案的實體路徑</param>        public static string Xml2PemPublic(string xml, string saveFile)        {            var rsa = new RSACryptoServiceProvider();            rsa.FromXmlString(xml);            var p = rsa.ExportParameters(false);            RsaKeyParameters key = new RsaKeyParameters(false, new BigInteger(1, p.Modulus), new BigInteger(1, p.Exponent));            using (var sw = new StreamWriter(saveFile))            {                var pemWriter = new Org.BouncyCastle.OpenSsl.PemWriter(sw);                pemWriter.WriteObject(key);            }            SubjectPublicKeyInfo publicKeyInfo = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(key);            byte[] serializedPublicBytes = publicKeyInfo.ToAsn1Object().GetDerEncoded();            string publicKey = Convert.ToBase64String(serializedPublicBytes);            return Format(publicKey, 1);        }        /// <summary>        ///  XML格式私密金鑰轉PEM        /// </summary>        /// <param name="xml">XML格式私密金鑰</param>        /// <param name="saveFile">儲存檔案的實體路徑</param>        public static string Xml2PemPrivate(string xml, string saveFile)        {            var rsa = new RSACryptoServiceProvider();            rsa.FromXmlString(xml);            var p = rsa.ExportParameters(true);            var key = new RsaPrivateCrtKeyParameters(                new BigInteger(1, p.Modulus), new BigInteger(1, p.Exponent), new BigInteger(1, p.D),                new BigInteger(1, p.P), new BigInteger(1, p.Q), new BigInteger(1, p.DP), new BigInteger(1, p.DQ),                new BigInteger(1, p.InverseQ));            using (var sw = new StreamWriter(saveFile))            {                var pemWriter = new Org.BouncyCastle.OpenSsl.PemWriter(sw);                pemWriter.WriteObject(key);            }            PrivateKeyInfo privateKeyInfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(key);            byte[] serializedPrivateBytes = privateKeyInfo.ToAsn1Object().GetEncoded();            string privateKey = Convert.ToBase64String(serializedPrivateBytes);            return Format(privateKey, 2);        }        /// <summary>        ///  格式化公開金鑰/私密金鑰        /// </summary>        /// <param name="key">產生的公開金鑰/私密金鑰</param>        /// <param name="type">1:公開金鑰 2:私密金鑰</param>        /// <returns>PEM格式的公開金鑰/私密金鑰</returns>        public static string Format(string key, int type)        {            string result = string.Empty;            int length = key.Length / 64;            for (int i = 0; i < length; i++)            {                int start = i * 64;                result = result + key.Substring(start, 64) + "\r\n";            }            result = result + key.Substring(length * 64);            if (type == 1)            {                result = result.Insert(0, "-----BEGIN PUBLIC KEY-----\r\n");                result += "\r\n-----END PUBLIC KEY-----";            }            if (type == 2)            {                result = result.Insert(0, "-----BEGIN PRIVATE KEY-----\r\n");                result += "\r\n-----END PRIVATE KEY-----";            }            return result;        }

4.最後輸出在F盤的TXT檔案裡面就是可以直接用來Copy到驗證工具裡面直接加密/解密資料用的