diff --git a/patches/android.patch b/patches/android.patch
index 7272cc4..40a24f8 100644
--- a/patches/android.patch
+++ b/patches/android.patch
@@ -9420,24 +9420,7 @@
  import org.bouncycastle.asn1.x9.X962NamedCurves;
  import org.bouncycastle.asn1.x9.X9ECParameters;
  import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
-@@ -151,6 +155,16 @@
-                             k.getD(),
-                             new ECDomainParameters(s.getCurve(), s.getG(), s.getN(), s.getH(), s.getSeed()));
-         }
-+// BEGIN android-added
-+        else if (key instanceof java.security.interfaces.ECPrivateKey)
-+        {
-+            java.security.interfaces.ECPrivateKey privKey = (java.security.interfaces.ECPrivateKey)key;
-+            ECParameterSpec s = EC5Util.convertSpec(privKey.getParams(), false);
-+            return new ECPrivateKeyParameters(
-+                            privKey.getS(),
-+                            new ECDomainParameters(s.getCurve(), s.getG(), s.getN(), s.getH(), s.getSeed()));
-+        }
-+// END android-added
-                         
-         throw new InvalidKeyException("can't identify EC private key.");
-     }
-@@ -167,14 +181,16 @@
+@@ -167,14 +171,16 @@
              {
                  oid = NISTNamedCurves.getOID(name);
              }
@@ -9462,7 +9445,7 @@
          }
  
          return oid;
-@@ -192,10 +208,12 @@
+@@ -192,10 +198,12 @@
              {
                  params = NISTNamedCurves.getByOID(oid);
              }
@@ -9479,7 +9462,7 @@
          }
  
          return params;
-@@ -213,14 +231,16 @@
+@@ -213,14 +221,16 @@
              {
                  name = NISTNamedCurves.getName(oid);
              }
@@ -10034,17 +10017,7 @@
 diff -Naur bcprov-jdk16-146.orig/org/bouncycastle/jce/provider/asymmetric/ec/Signature.java bcprov-jdk16-146/org/bouncycastle/jce/provider/asymmetric/ec/Signature.java
 --- bcprov-jdk16-146.orig/org/bouncycastle/jce/provider/asymmetric/ec/Signature.java	2011-02-23 20:08:56.000000000 +0000
 +++ bcprov-jdk16-146/org/bouncycastle/jce/provider/asymmetric/ec/Signature.java	2012-07-27 18:48:00.031478939 +0000
-@@ -6,6 +6,9 @@
- import java.security.PrivateKey;
- import java.security.PublicKey;
- import java.security.SecureRandom;
-+// BEGIN android-added
-+import java.security.interfaces.ECPrivateKey;
-+// END android-added
- import java.security.interfaces.ECPublicKey;
- 
- import org.bouncycastle.asn1.ASN1Encodable;
-@@ -18,15 +21,21 @@
+@@ -18,15 +18,21 @@
  import org.bouncycastle.crypto.DSA;
  import org.bouncycastle.crypto.Digest;
  import org.bouncycastle.crypto.digests.NullDigest;
@@ -10069,33 +10042,7 @@
  import org.bouncycastle.jce.interfaces.ECKey;
  import org.bouncycastle.jce.provider.DSABase;
  import org.bouncycastle.jce.provider.DSAEncoder;
-@@ -89,7 +98,25 @@
-         }
-         else
-         {
-+// BEGIN android-added
-+            try
-+            {
-+                if (privateKey instanceof ECPrivateKey)
-+                {
-+                    param = ECUtil.generatePrivateKeyParameter(privateKey);
-+                }
-+                else
-+                {
-+                    throw new InvalidKeyException("can't recognise key type in ECDSA based signer");
-+                }
-+            }
-+            catch (Exception e)
-+            {
-+// END android-added
-             throw new InvalidKeyException("can't recognise key type in ECDSA based signer");
-+// BEGIN android-added
-+            }
-+// END android-added
-         }
- 
-         digest.reset();
-@@ -122,14 +149,16 @@
+@@ -122,14 +128,16 @@
          }
      }
  
@@ -10120,7 +10067,7 @@
  
      static public class ecDSA256
          extends Signature
-@@ -158,86 +187,88 @@
+@@ -158,86 +166,88 @@
          }
      }
  
@@ -10289,7 +10236,7 @@
  
      private static class StdDSAEncoder
          implements DSAEncoder
-@@ -331,4 +362,4 @@
+@@ -331,4 +341,4 @@
              return sig;
          }
      }
diff --git a/src/main/java/org/bouncycastle/jce/provider/asymmetric/ec/ECUtil.java b/src/main/java/org/bouncycastle/jce/provider/asymmetric/ec/ECUtil.java
index 6f2f28a..088dfad 100644
--- a/src/main/java/org/bouncycastle/jce/provider/asymmetric/ec/ECUtil.java
+++ b/src/main/java/org/bouncycastle/jce/provider/asymmetric/ec/ECUtil.java
@@ -155,16 +155,6 @@
                             k.getD(),
                             new ECDomainParameters(s.getCurve(), s.getG(), s.getN(), s.getH(), s.getSeed()));
         }
-// BEGIN android-added
-        else if (key instanceof java.security.interfaces.ECPrivateKey)
-        {
-            java.security.interfaces.ECPrivateKey privKey = (java.security.interfaces.ECPrivateKey)key;
-            ECParameterSpec s = EC5Util.convertSpec(privKey.getParams(), false);
-            return new ECPrivateKeyParameters(
-                            privKey.getS(),
-                            new ECDomainParameters(s.getCurve(), s.getG(), s.getN(), s.getH(), s.getSeed()));
-        }
-// END android-added
                         
         throw new InvalidKeyException("can't identify EC private key.");
     }
diff --git a/src/main/java/org/bouncycastle/jce/provider/asymmetric/ec/Signature.java b/src/main/java/org/bouncycastle/jce/provider/asymmetric/ec/Signature.java
index c5812c4..0bb21f8 100644
--- a/src/main/java/org/bouncycastle/jce/provider/asymmetric/ec/Signature.java
+++ b/src/main/java/org/bouncycastle/jce/provider/asymmetric/ec/Signature.java
@@ -6,9 +6,6 @@
 import java.security.PrivateKey;
 import java.security.PublicKey;
 import java.security.SecureRandom;
-// BEGIN android-added
-import java.security.interfaces.ECPrivateKey;
-// END android-added
 import java.security.interfaces.ECPublicKey;
 
 import org.bouncycastle.asn1.ASN1Encodable;
@@ -98,25 +95,7 @@
         }
         else
         {
-// BEGIN android-added
-            try
-            {
-                if (privateKey instanceof ECPrivateKey)
-                {
-                    param = ECUtil.generatePrivateKeyParameter(privateKey);
-                }
-                else
-                {
-                    throw new InvalidKeyException("can't recognise key type in ECDSA based signer");
-                }
-            }
-            catch (Exception e)
-            {
-// END android-added
             throw new InvalidKeyException("can't recognise key type in ECDSA based signer");
-// BEGIN android-added
-            }
-// END android-added
         }
 
         digest.reset();