github #237 - gost 2012 parsing

2 files changed, 20 insertions, 5 deletions

diff --git a/crypto/src/asn1/pkcs/PrivateKeyInfo.cs b/crypto/src/asn1/pkcs/PrivateKeyInfo.cs

index ba9ef6a53..c5c7c3a2f 100644
--- a/crypto/src/asn1/pkcs/PrivateKeyInfo.cs
+++ b/crypto/src/asn1/pkcs/PrivateKeyInfo.cs
@@ -167,6 +167,11 @@ namespace Org.BouncyCastle.Asn1.Pkcs
             get { return privateKeyAlgorithm; }
         }
 
+        public virtual Asn1OctetString PrivateKeyData
+        {
+            get { return privateKey; }
+        } 
+
         public virtual Asn1Object ParsePrivateKey()
         {
             return Asn1Object.FromByteArray(privateKey.GetOctets());
diff --git a/crypto/src/security/PrivateKeyFactory.cs b/crypto/src/security/PrivateKeyFactory.cs

index b72ece365..4c7a91ecf 100644
--- a/crypto/src/security/PrivateKeyFactory.cs
+++ b/crypto/src/security/PrivateKeyFactory.cs
@@ -206,15 +206,25 @@ namespace Org.BouncyCastle.Security
                             gostParams.PublicKeyParamSet,
                             gostParams.DigestParamSet,
                             gostParams.EncryptionParamSet);
-                    Asn1Encodable privKey = keyInfo.ParsePrivateKey();
-                    if (privKey is DerInteger)
+
+                    Asn1OctetString privEnc = keyInfo.PrivateKeyData;
+                    if (privEnc.GetOctets().Length == 32 || privEnc.GetOctets().Length == 64)
                     {
-                        d = DerInteger.GetInstance(privKey).PositiveValue;
+                        byte[] dVal = Arrays.Reverse(privEnc.GetOctets());
+                        d = new BigInteger(1, dVal);
                     }
                     else
                     {
-                        byte[] dVal = Arrays.Reverse(Asn1OctetString.GetInstance(privKey).GetOctets());
-                        d = new BigInteger(1, dVal);
+                        Asn1Encodable privKey = keyInfo.ParsePrivateKey();
+                        if (privKey is DerInteger)
+                        {
+                            d = DerInteger.GetInstance(privKey).PositiveValue;
+                        }
+                        else
+                        {
+                            byte[] dVal = Arrays.Reverse(Asn1OctetString.GetInstance(privKey).GetOctets());
+                            d = new BigInteger(1, dVal);
+                        }
                     }
                 }
                 else