Add project files.

Core.Cerberos.Adapters/Helpers/RsaHelper.cs

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+// ***********************************************************************
+// <copyright file="RsaHelper.cs">
+//     Heath
+// </copyright>
+// ***********************************************************************
+using Org.BouncyCastle.Crypto;
+using Org.BouncyCastle.Crypto.Parameters;
+using Org.BouncyCastle.OpenSsl;
+using Org.BouncyCastle.Security;
+using System.Security.Cryptography;
+using System.Text;
+
+namespace Core.Cerberos.Adapters.Helpers
+{
+    /// <summary>
+    /// Handles all methods related to RSA encryption"/>.
+    /// </summary>
+    public class RsaHelper
+    {
+        private readonly RSACryptoServiceProvider _privateKey;
+        private readonly RSACryptoServiceProvider _publicKey;
+        private readonly string keysFolder = "Keys\\";
+        private readonly string exeDirectory = AppContext.BaseDirectory;
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="RsaHelper"/>.
+        /// </summary>
+        public RsaHelper()
+        {
+            exeDirectory = exeDirectory + keysFolder;
+
+            _publicKey = GetPublicKeyFromPemFile();
+            _privateKey = GetPrivateKeyFromPemFile();
+        }
+
+        /// <summary>
+        /// Encrypts a text using RSA algorithm.
+        /// </summary>
+        /// <param name="text">The text to be encrypted.</param>
+        /// <returns>The encrypted text.</returns>
+        public string Encrypt(string text)
+        {
+            byte[] dataBytes = Encoding.UTF8.GetBytes(text);
+            var encryptedBytes = _publicKey.Encrypt(Encoding.UTF8.GetBytes(text), true);
+            return Convert.ToBase64String(encryptedBytes);
+        }
+
+        /// <summary>
+        /// Decrypts a text using RSA algorithm.
+        /// </summary>
+        /// <param name="text">The encrypted text to be decrypted.</param>
+        /// <returns>The decrypted text.</returns>
+        public string Decrypt(string encrypted)
+        {
+            var decryptedBytes = _privateKey.Decrypt(Convert.FromBase64String(encrypted), true);
+            return Encoding.UTF8.GetString(decryptedBytes, 0, decryptedBytes.Length);
+        }
+
+        /// <summary>
+        ///Obtains the private key from a file.
+        /// </summary>
+        /// <returns>The private key.</returns>
+        private RSACryptoServiceProvider GetPrivateKeyFromPemFile()
+        {
+            using (TextReader privateKeyTextReader = new StringReader(File.ReadAllText(Path.Combine(exeDirectory, "HeathPrivateKey.pem"))))
+            {
+                AsymmetricCipherKeyPair readKeyPair = (AsymmetricCipherKeyPair)new PemReader(privateKeyTextReader).ReadObject();
+
+                RSAParameters rsaParams = DotNetUtilities.ToRSAParameters((RsaPrivateCrtKeyParameters)readKeyPair.Private);
+                RSACryptoServiceProvider csp = new RSACryptoServiceProvider();
+                csp.ImportParameters(rsaParams);
+                return csp;
+            }
+        }
+
+        /// <summary>
+        ///Obtains the public key from a file.
+        /// </summary>
+        /// <returns>The public key.</returns>
+        public RSACryptoServiceProvider GetPublicKeyFromPemFile()
+        {
+            using (TextReader publicKeyTextReader = new StringReader(File.ReadAllText(Path.Combine(exeDirectory, "HeathPublicKey.pem"))))
+            {
+                RsaKeyParameters publicKeyParam = (RsaKeyParameters)new PemReader(publicKeyTextReader).ReadObject();
+
+                RSAParameters rsaParams = DotNetUtilities.ToRSAParameters((RsaKeyParameters)publicKeyParam);
+
+                RSACryptoServiceProvider csp = new RSACryptoServiceProvider();
+                csp.ImportParameters(rsaParams);
+                return csp;
+            }
+        }
+    }
+}