加入测试，要求aes加密为不稳定加密。及相同条件每次加密出结果不同

Falcon.Extend/AESCryptoService.cs

@@ -19,13 +19,13 @@ namespace Falcon.Extend
         public string Encrypt(string content,string key) {
             var encryptKey = GetDecryptKey(key);
             using(var aesAlg = Aes.Create()) {
-                using(var encryptor = aesAlg.CreateEncryptor(encryptKey,aesAlg.IV)) {
+                var iv = aesAlg.IV;
+                using(var encryptor = aesAlg.CreateEncryptor(encryptKey,iv)) {
                     using(var msEncrypt = new MemoryStream()) {
                         using(var csEncrypt = new CryptoStream(msEncrypt,encryptor,CryptoStreamMode.Write))
                         using(var swEncrypt = new StreamWriter(csEncrypt)) {
                             swEncrypt.Write(content);
                         }
-                        var iv = aesAlg.IV;
                         var decryptedContent = msEncrypt.ToArray();
                         var result = new byte[iv.Length + decryptedContent.Length];
                         Buffer.BlockCopy(iv,0,result,0,iv.Length);

Falcon.ExtendTests/AESCryptoServiceTests.cs

@@ -9,6 +9,9 @@ namespace Falcon.Extend.Tests
     [TestClass()]
     public class AESCryptoServiceTests
     {
+        /// <summary>
+        /// 测试可用性
+        /// </summary>
         [TestMethod()]
         public void EncryptTest() {
             ICryptoService service = new AESCryptoService();
@@ -24,5 +27,21 @@ namespace Falcon.Extend.Tests
                 }
             }
         }
+        /// <summary>
+        /// 测试加密稳定性
+        /// </summary>
+        [TestMethod()]
+        public void EncryptTest2() {
+            ICryptoService service = new AESCryptoService();
+            var m = "aaaaa";
+            var k = "abcd";
+            var m1 = service.Encrypt(m,k);
+            var m2 = service.Encrypt(m,k);
+            Assert.AreNotEqual(m1,m2);
+            var m3 = service.Decrypt(m1,k);
+            var m4 = service.Decrypt(m2,k);
+            Assert.AreEqual(m3,m4);
+            Assert.AreEqual(m,m3);
+        }
     }
 }