[Security] 新增 OaepSHA1WithRSA 类，删除 RSAUtilities、RSA_ECB_OAEPWithSHA1A…

…ndMGF1Padding

src/Essensoft.AspNetCore.Payment.Security/Essensoft.AspNetCore.Payment.Security.csproj

@@ -6,8 +6,4 @@
     <PackageTags>Essensoft;Payment;Security</PackageTags>
   </PropertyGroup>
 
-  <ItemGroup>
-    <PackageReference Include="Portable.BouncyCastle" Version="1.8.5.2" />
-  </ItemGroup>
-
 </Project>

src/Essensoft.AspNetCore.Payment.Security/OaepSHA1WithRSA.cs

@@ -0,0 +1,47 @@
+using System;
+using System.Security.Cryptography;
+using System.Text;
+
+namespace Essensoft.AspNetCore.Payment.Security
+{
+    public static class OaepSHA1WithRSA
+    {
+        public static string Encrypt(string data, string publicKey)
+        {
+            if (string.IsNullOrEmpty(data))
+            {
+                throw new ArgumentNullException(nameof(data));
+            }
+
+            if (string.IsNullOrEmpty(publicKey))
+            {
+                throw new ArgumentNullException(nameof(publicKey));
+            }
+
+            using (var rsa = RSA.Create())
+            {
+                rsa.ImportRSAPublicKey(Convert.FromBase64String(publicKey), out var _);
+                return Convert.ToBase64String(rsa.Encrypt(Encoding.UTF8.GetBytes(data), RSAEncryptionPadding.OaepSHA1));
+            }
+        }
+
+        public static string Decrypt(string data, string privateKey)
+        {
+            if (string.IsNullOrEmpty(data))
+            {
+                throw new ArgumentNullException(nameof(data));
+            }
+
+            if (string.IsNullOrEmpty(privateKey))
+            {
+                throw new ArgumentNullException(nameof(privateKey));
+            }
+
+            using (var rsa = RSA.Create())
+            {
+                rsa.ImportRSAPrivateKey(Convert.FromBase64String(privateKey), out var _);
+                return Encoding.UTF8.GetString(rsa.Decrypt(Convert.FromBase64String(data), RSAEncryptionPadding.OaepSHA1));
+            }
+        }
+    }
+}