diff --git a/src/Essensoft.AspNetCore.Payment.Alipay/Utility/AlipaySignature.cs b/src/Essensoft.AspNetCore.Payment.Alipay/Utility/AlipaySignature.cs
index 536d6d195..b83fb6a1f 100644
--- a/src/Essensoft.AspNetCore.Payment.Alipay/Utility/AlipaySignature.cs
+++ b/src/Essensoft.AspNetCore.Payment.Alipay/Utility/AlipaySignature.cs
@@ -2,7 +2,6 @@
 using System.Security.Cryptography;
 using System.Text;
 using Essensoft.AspNetCore.Payment.Security;
-using Org.BouncyCastle.X509;
 
 namespace Essensoft.AspNetCore.Payment.Alipay.Utility
 {
@@ -32,25 +31,27 @@ public static string GetSignContent(IDictionary<string, string> dictionary)
 
         public static string RSASignContent(string data, string privateKey, string signType)
         {
-            var key = RSAUtilities.GetRSAParametersFormRsaPrivateKey(privateKey);
             switch (signType)
             {
+                case "RSA1":
+                    return SHA1WithRSA.Sign(data, privateKey);
                 case "RSA2":
-                    return SHA256WithRSA.Sign(data, key);
+                    return SHA256WithRSA.Sign(data, privateKey);
                 default:
-                    return SHA1WithRSA.Sign(data, key);
+                    return SHA1WithRSA.Sign(data, privateKey);
             }
         }
 
         public static bool RSACheckContent(string data, string sign, string publicKey, string signType)
         {
-            var key = RSAUtilities.GetRSAParametersFormPublicKey(publicKey);
             switch (signType)
             {
+                case "RSA1":
+                    return SHA1WithRSA.Verify(data, sign, publicKey);
                 case "RSA2":
-                    return SHA256WithRSA.Verify(data, sign, key);
+                    return SHA256WithRSA.Verify(data, sign, publicKey);
                 default:
-                    return SHA1WithRSA.Verify(data, sign, key);
+                    return SHA1WithRSA.Verify(data, sign, publicKey);
             }
         }
 
diff --git a/src/Essensoft.AspNetCore.Payment.Security/RSAUtilities.cs b/src/Essensoft.AspNetCore.Payment.Security/RSAUtilities.cs
index c7f72f950..1254abcec 100644
--- a/src/Essensoft.AspNetCore.Payment.Security/RSAUtilities.cs
+++ b/src/Essensoft.AspNetCore.Payment.Security/RSAUtilities.cs
@@ -1,64 +1,13 @@
 using System;
-using System.Security.Cryptography;
 using Org.BouncyCastle.Asn1;
-using Org.BouncyCastle.Asn1.Pkcs;
 using Org.BouncyCastle.Asn1.X509;
 using Org.BouncyCastle.Crypto;
 using Org.BouncyCastle.Crypto.Parameters;
-using Org.BouncyCastle.Security;
 
 namespace Essensoft.AspNetCore.Payment.Security
 {
     public static class RSAUtilities
     {
-        /// <summary>
-        /// -----BEGIN RSA PRIVATE KEY-----
-        /// ...
-        /// -----END RSA PRIVATE KEY-----
-        /// </summary>
-        /// <param name="privateKey"></param>
-        public static RSAParameters GetRSAParametersFormRsaPrivateKey(string privateKey)
-        {
-            if (string.IsNullOrEmpty(privateKey))
-            {
-                throw new ArgumentNullException(nameof(privateKey));
-            }
-
-            var key = RsaPrivateKeyStructure.GetInstance(Convert.FromBase64String(privateKey));
-            return new RSAParameters
-            {
-                D = key.PrivateExponent.ToByteArrayUnsigned(),
-                DP = key.Exponent1.ToByteArrayUnsigned(),
-                DQ = key.Exponent2.ToByteArrayUnsigned(),
-                Exponent = key.PublicExponent.ToByteArrayUnsigned(),
-                InverseQ = key.Coefficient.ToByteArrayUnsigned(),
-                Modulus = key.Modulus.ToByteArrayUnsigned(),
-                P = key.Prime1.ToByteArrayUnsigned(),
-                Q = key.Prime2.ToByteArrayUnsigned(),
-            };
-        }
-
-        /// <summary>
-        /// -----BEGIN PUBLIC KEY-----
-        /// ...
-        /// -----END PUBLIC KEY-----
-        /// </summary>
-        /// <param name="publicKey"></param>
-        public static RSAParameters GetRSAParametersFormPublicKey(string publicKey)
-        {
-            if (string.IsNullOrEmpty(publicKey))
-            {
-                throw new ArgumentNullException(nameof(publicKey));
-            }
-
-            var key = (RsaKeyParameters)PublicKeyFactory.CreateKey(Convert.FromBase64String(publicKey));
-            return new RSAParameters
-            {
-                Modulus = key.Modulus.ToByteArrayUnsigned(),
-                Exponent = key.Exponent.ToByteArrayUnsigned()
-            };
-        }
-
         /// <summary>
         /// -----BEGIN RSA PUBLIC KEY-----
         /// ...
diff --git a/src/Essensoft.AspNetCore.Payment.Security/SHA1WithRSA.cs b/src/Essensoft.AspNetCore.Payment.Security/SHA1WithRSA.cs
index a36a0ce72..4713a15ea 100644
--- a/src/Essensoft.AspNetCore.Payment.Security/SHA1WithRSA.cs
+++ b/src/Essensoft.AspNetCore.Payment.Security/SHA1WithRSA.cs
@@ -6,21 +6,26 @@ namespace Essensoft.AspNetCore.Payment.Security
 {
     public static class SHA1WithRSA
     {
-        public static string Sign(string data, RSAParameters privateKey)
+        public static string Sign(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.ImportParameters(privateKey);
+                rsa.ImportRSAPrivateKey(Convert.FromBase64String(privateKey), out var _);
                 return Convert.ToBase64String(rsa.SignData(Encoding.UTF8.GetBytes(data), HashAlgorithmName.SHA1, RSASignaturePadding.Pkcs1));
             }
         }
 
-        public static bool Verify(string data, string sign, RSAParameters publicKey)
+        public static bool Verify(string data, string sign, string publicKey)
         {
             if (string.IsNullOrEmpty(data))
             {
@@ -32,9 +37,14 @@ public static bool Verify(string data, string sign, RSAParameters publicKey)
                 throw new ArgumentNullException(nameof(sign));
             }
 
+            if (string.IsNullOrEmpty(publicKey))
+            {
+                throw new ArgumentNullException(nameof(publicKey));
+            }
+
             using (var rsa = RSA.Create())
             {
-                rsa.ImportParameters(publicKey);
+                rsa.ImportSubjectPublicKeyInfo(Convert.FromBase64String(publicKey), out var _);
                 return rsa.VerifyData(Encoding.UTF8.GetBytes(data), Convert.FromBase64String(sign), HashAlgorithmName.SHA1, RSASignaturePadding.Pkcs1);
             }
         }
diff --git a/src/Essensoft.AspNetCore.Payment.Security/SHA256WithRSA.cs b/src/Essensoft.AspNetCore.Payment.Security/SHA256WithRSA.cs
index d14011f10..e7dcc67bd 100644
--- a/src/Essensoft.AspNetCore.Payment.Security/SHA256WithRSA.cs
+++ b/src/Essensoft.AspNetCore.Payment.Security/SHA256WithRSA.cs
@@ -6,21 +6,26 @@ namespace Essensoft.AspNetCore.Payment.Security
 {
     public static class SHA256WithRSA
     {
-        public static string Sign(string data, RSAParameters privateKey)
+        public static string Sign(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.ImportParameters(privateKey);
+                rsa.ImportRSAPrivateKey(Convert.FromBase64String(privateKey), out var _);
                 return Convert.ToBase64String(rsa.SignData(Encoding.UTF8.GetBytes(data), HashAlgorithmName.SHA256, RSASignaturePadding.Pkcs1));
             }
         }
 
-        public static bool Verify(string data, string sign, RSAParameters publicKey)
+        public static bool Verify(string data, string sign, string publicKey)
         {
             if (string.IsNullOrEmpty(data))
             {
@@ -32,9 +37,14 @@ public static bool Verify(string data, string sign, RSAParameters publicKey)
                 throw new ArgumentNullException(nameof(sign));
             }
 
+            if (string.IsNullOrEmpty(publicKey))
+            {
+                throw new ArgumentNullException(nameof(publicKey));
+            }
+
             using (var rsa = RSA.Create())
             {
-                rsa.ImportParameters(publicKey);
+                rsa.ImportSubjectPublicKeyInfo(Convert.FromBase64String(publicKey), out var _);
                 return rsa.VerifyData(Encoding.UTF8.GetBytes(data), Convert.FromBase64String(sign), HashAlgorithmName.SHA256, RSASignaturePadding.Pkcs1);
             }
         }