add base64 encrypt and decrypt

src/NETCore.Encrypt/EncryptProvider.cs

@@ -617,5 +617,53 @@ private static string CreateMachineKey(int length)
         }
 
         #endregion
+
+        #region Base64
+
+        #region Base64加密解密
+        /// <summary>
+        /// Base64 encrypt
+        /// </summary>
+        /// <param name="input">input value</param>
+        /// <returns></returns>
+        public static string Base64Encrypt(string input)
+        {
+            return Base64Encrypt(input, Encoding.UTF8);
+        }
+
+        /// <summary>
+        /// Base64 encrypt
+        /// </summary>
+        /// <param name="input">input value</param>
+        /// <param name="encoding">text encoding</param>
+        /// <returns></returns>
+        public static string Base64Encrypt(string input, Encoding encoding)
+        {
+            return Convert.ToBase64String(encoding.GetBytes(input));
+        }
+
+        /// <summary>
+        /// Base64 decrypt
+        /// </summary>
+        /// <param name="input">input value</param>
+        /// <returns></returns>
+        public static string Base64Decrypt(string input)
+        {
+            return Base64Decrypt(input, Encoding.UTF8);
+        }
+
+        /// <summary>
+        /// Base64 decrypt
+        /// </summary>
+        /// <param name="input">input value</param>
+        /// <param name="encoding">text encoding</param>
+        /// <returns></returns>
+        public static string Base64Decrypt(string input, Encoding encoding)
+        {
+            return encoding.GetString(Convert.FromBase64String(input));
+        }
+        #endregion
+
+        #endregion
     }
 }

src/NETCore.Encrypt/Internal/RsaKeyType.cs

@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace NETCore.Encrypt.Internal
+{
+    public enum RsaKeyType
+    {
+        XML,
+        JSON
+    }
+}