1 files changed, 69 insertions, 0 deletions
diff --git a/libraries/spongycastle/prov/src/main/java/org/spongycastle/jcajce/provider/asymmetric/dstu/SignatureSpiLe.java b/libraries/spongycastle/prov/src/main/java/org/spongycastle/jcajce/provider/asymmetric/dstu/SignatureSpiLe.java
new file mode 100644
index 000000000..1b83d55e0
--- /dev/null
+++ b/libraries/spongycastle/prov/src/main/java/org/spongycastle/jcajce/provider/asymmetric/dstu/SignatureSpiLe.java
@@ -0,0 +1,69 @@
+package org.spongycastle.jcajce.provider.asymmetric.dstu;
+
+import java.io.IOException;
+import java.security.SignatureException;
+
+import org.spongycastle.asn1.ASN1OctetString;
+import org.spongycastle.asn1.DEROctetString;
+
+public class SignatureSpiLe
+    extends SignatureSpi
+{
+    void reverseBytes(byte[] bytes)
+    {
+        byte tmp;
+
+        for (int i = 0; i < bytes.length / 2; i++)
+        {
+            tmp = bytes[i];
+            bytes[i] = bytes[bytes.length - 1 - i];
+            bytes[bytes.length - 1 - i] = tmp;
+        }
+    }
+
+    protected byte[] engineSign()
+        throws SignatureException
+    {
+        byte[] signature = ASN1OctetString.getInstance(super.engineSign()).getOctets();
+        reverseBytes(signature);
+        try
+        {
+            return (new DEROctetString(signature)).getEncoded();
+        }
+        catch (Exception e)
+        {
+            throw new SignatureException(e.toString());
+        }
+    }
+
+    protected boolean engineVerify(
+        byte[] sigBytes)
+        throws SignatureException
+    {
+        byte[] bytes = null;
+
+        try
+        {
+            bytes = ((ASN1OctetString)ASN1OctetString.fromByteArray(sigBytes)).getOctets();
+        }
+        catch (IOException e)
+        {
+            throw new SignatureException("error decoding signature bytes.");
+        }
+
+        reverseBytes(bytes);
+
+        try
+        {
+            return super.engineVerify((new DEROctetString(bytes)).getEncoded());
+        }
+        catch (SignatureException e)
+        {
+            throw e;
+        }
+        catch (Exception e)
+        {
+            throw new SignatureException(e.toString());
+        }
+    }
+}