KSM-476 fixed parsing keys in DER format

Keeper-Security · Nov 21, 2023 · 944b633 · 944b633
1 parent 9b19035
commit 944b633
Showing 1 changed file with 7 additions and 2 deletions.
diff --git a/sdk/dotNet/SecretsManager/CryptoUtils.cs b/sdk/dotNet/SecretsManager/CryptoUtils.cs
@@ -15,6 +15,8 @@
 using System.Security.Cryptography;
 using System.Text;
 using System.Text.RegularExpressions;
+using Org.BouncyCastle.Asn1.Pkcs;
+using Org.BouncyCastle.Asn1.Sec;
 
 namespace SecretsManager
 {
@@ -105,8 +107,11 @@ private static ECPublicKeyParameters ImportPublicKey(byte[] key)
         }
 
         private static ECPrivateKeyParameters ImportPrivateKey(byte[] privateKeyDer)
-        {
-            return new ECPrivateKeyParameters(new BigInteger(1, privateKeyDer.Skip(36).Take(32).ToArray()), ECParameters);
+        {
+            var privateKeyInfo = PrivateKeyInfo.GetInstance(privateKeyDer);
+            var privateKeyStructure = ECPrivateKeyStructure.GetInstance(privateKeyInfo.ParsePrivateKey());
+            var privateKeyValue = privateKeyStructure.GetKey();
+            return new ECPrivateKeyParameters(privateKeyValue, ECParameters);
         }
 
         private static byte[] GetECIESSymmetricKey(ICipherParameters privateKey, ICipherParameters recipientPublicKey)