diff --git a/bcprov/src/main/java/org/bouncycastle/jcajce/provider/asymmetric/ec/ECUtil.java b/bcprov/src/main/java/org/bouncycastle/jcajce/provider/asymmetric/ec/ECUtil.java
index 80ff2af..2c44d2a 100644
--- a/bcprov/src/main/java/org/bouncycastle/jcajce/provider/asymmetric/ec/ECUtil.java
+++ b/bcprov/src/main/java/org/bouncycastle/jcajce/provider/asymmetric/ec/ECUtil.java
@@ -154,6 +154,16 @@
                             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.");
     }
diff --git a/bcprov/src/main/java/org/bouncycastle/jcajce/provider/asymmetric/ec/SignatureSpi.java b/bcprov/src/main/java/org/bouncycastle/jcajce/provider/asymmetric/ec/SignatureSpi.java
index a92b7da..f5fbc3b 100644
--- a/bcprov/src/main/java/org/bouncycastle/jcajce/provider/asymmetric/ec/SignatureSpi.java
+++ b/bcprov/src/main/java/org/bouncycastle/jcajce/provider/asymmetric/ec/SignatureSpi.java
@@ -5,6 +5,9 @@
 import java.security.InvalidKeyException;
 import java.security.PrivateKey;
 import java.security.PublicKey;
+// BEGIN android-added
+import java.security.interfaces.ECPrivateKey;
+// END android-added
 import java.security.interfaces.ECPublicKey;
 
 import org.bouncycastle.asn1.ASN1EncodableVector;
@@ -95,7 +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();
diff --git a/patches/bcprov.patch b/patches/bcprov.patch
index 5feae73..7f45753 100644
--- a/patches/bcprov.patch
+++ b/patches/bcprov.patch
@@ -2043,7 +2043,24 @@
  import org.bouncycastle.asn1.x9.X962NamedCurves;
  import org.bouncycastle.asn1.x9.X9ECParameters;
  import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
-@@ -166,14 +170,16 @@
+@@ -150,6 +154,16 @@
+                             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.");
+     }
+@@ -166,14 +180,16 @@
              {
                  oid = NISTNamedCurves.getOID(name);
              }
@@ -2587,7 +2604,17 @@
 diff -Naur bcprov-jdk15on-147.orig/org/bouncycastle/jcajce/provider/asymmetric/ec/SignatureSpi.java bcprov-jdk15on-147/org/bouncycastle/jcajce/provider/asymmetric/ec/SignatureSpi.java
 --- bcprov-jdk15on-147.orig/org/bouncycastle/jcajce/provider/asymmetric/ec/SignatureSpi.java	2012-03-22 15:11:48.000000000 +0000
 +++ bcprov-jdk15on-147/org/bouncycastle/jcajce/provider/asymmetric/ec/SignatureSpi.java	2012-09-19 21:17:12.000000000 +0000
-@@ -18,15 +18,22 @@
+@@ -5,6 +5,9 @@
+ import java.security.InvalidKeyException;
+ import java.security.PrivateKey;
+ import java.security.PublicKey;
++// BEGIN android-added
++import java.security.interfaces.ECPrivateKey;
++// END android-added
+ import java.security.interfaces.ECPublicKey;
+ 
+ import org.bouncycastle.asn1.ASN1EncodableVector;
+@@ -18,15 +21,22 @@
  import org.bouncycastle.crypto.DSA;
  import org.bouncycastle.crypto.Digest;
  import org.bouncycastle.crypto.digests.NullDigest;
@@ -2617,7 +2644,33 @@
  import org.bouncycastle.jcajce.provider.asymmetric.util.DSABase;
  import org.bouncycastle.jcajce.provider.asymmetric.util.DSAEncoder;
  import org.bouncycastle.jce.interfaces.ECKey;
-@@ -108,7 +115,9 @@
+@@ -88,7 +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();
+@@ -108,7 +136,9 @@
      {
          public ecDSA()
          {
@@ -2628,7 +2681,7 @@
          }
      }
  
-@@ -121,21 +130,25 @@
+@@ -121,21 +151,25 @@
          }
      }
  
@@ -2663,7 +2716,7 @@
          }
      }
  
-@@ -144,7 +157,9 @@
+@@ -144,7 +178,9 @@
      {
          public ecDSA384()
          {
@@ -2674,7 +2727,7 @@
          }
      }
  
-@@ -153,90 +168,94 @@
+@@ -153,90 +189,94 @@
      {
          public ecDSA512()
          {
@@ -2853,7 +2906,7 @@
  
      private static class StdDSAEncoder
          implements DSAEncoder
-@@ -330,4 +349,4 @@
+@@ -330,4 +370,4 @@
              return sig;
          }
      }