Update 20211218

WebAPI/Models/Crypto.cs

@@ -0,0 +1,127 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Security.Cryptography;
+using System.Threading.Tasks;
+
+namespace DPMService.Models
+{
+    public class Crypto
+    {
+
+        //public static void Main()
+        //{
+        //    try
+        //    {
+
+        //        string original = "Here is some data to encrypt!";
+
+        //        // Create a new instance of the RijndaelManaged
+        //        // class.  This generates a new key and initialization
+        //        // vector (IV).
+        //        using (RijndaelManaged myRijndael = new RijndaelManaged())
+        //        {
+
+        //            myRijndael.GenerateKey();
+        //            myRijndael.GenerateIV();
+        //            // Encrypt the string to an array of bytes.
+        //            byte[] encrypted = EncryptStringToBytes(original, myRijndael.Key, myRijndael.IV);
+
+        //            // Decrypt the bytes to a string.
+        //            string roundtrip = DecryptStringFromBytes(encrypted, myRijndael.Key, myRijndael.IV);
+
+        //            //Display the original data and the decrypted data.
+        //            Console.WriteLine("Original:   {0}", original);
+        //            Console.WriteLine("Round Trip: {0}", roundtrip);
+        //        }
+        //    }
+        //    catch (Exception e)
+        //    {
+        //        Console.WriteLine("Error: {0}", e.Message);
+        //    }
+        //}
+        public  byte[] EncryptStringToBytes(string plainText, byte[] Key, byte[] IV)
+        {
+            // Check arguments.
+            if (plainText == null || plainText.Length <= 0)
+                throw new ArgumentNullException("plainText");
+            if (Key == null || Key.Length <= 0)
+                throw new ArgumentNullException("Key");
+            if (IV == null || IV.Length <= 0)
+                throw new ArgumentNullException("IV");
+            byte[] encrypted;
+            // Create an RijndaelManaged object
+            // with the specified key and IV.
+            using (RijndaelManaged rijAlg = new RijndaelManaged())
+            {
+                rijAlg.Key = Key;
+                rijAlg.IV = IV;
+
+
+                // Create an encryptor to perform the stream transform.
+                ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);
+
+                // Create the streams used for encryption.
+                using (MemoryStream msEncrypt = new MemoryStream())
+                {
+                    using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
+                    {
+                        using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
+                        {
+
+                            //Write all data to the stream.
+                            swEncrypt.Write(plainText);
+                        }
+                        encrypted = msEncrypt.ToArray();
+                    }
+                }
+            }
+
+            // Return the encrypted bytes from the memory stream.
+            return encrypted;
+        }
+
+        public  string DecryptStringFromBytes(byte[] cipherText, byte[] Key, byte[] IV)
+        {
+            // Check arguments.
+            if (cipherText == null || cipherText.Length <= 0)
+                throw new ArgumentNullException("cipherText");
+            if (Key == null || Key.Length <= 0)
+                throw new ArgumentNullException("Key");
+            if (IV == null || IV.Length <= 0)
+                throw new ArgumentNullException("IV");
+
+            // Declare the string used to hold
+            // the decrypted text.
+            string plaintext = null;
+
+            // Create an RijndaelManaged object
+            // with the specified key and IV.
+            using (RijndaelManaged rijAlg = new RijndaelManaged())
+            {
+                rijAlg.Key = Key;
+                rijAlg.IV = IV;
+
+                // Create a decryptor to perform the stream transform.
+                ICryptoTransform decryptor = rijAlg.CreateDecryptor(rijAlg.Key, rijAlg.IV);
+
+                // Create the streams used for decryption.
+                using (MemoryStream msDecrypt = new MemoryStream(cipherText))
+                {
+                    using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
+                    {
+                        using (StreamReader srDecrypt = new StreamReader(csDecrypt))
+                        {
+                            // Read the decrypted bytes from the decrypting stream
+                            // and place them in a string.
+                            plaintext = srDecrypt.ReadToEnd();
+                        }
+                    }
+                }
+            }
+
+            return plaintext;
+        }
+    }
+}