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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8 with debug enabled.
package org.bouncycastle.jcajce.provider.asymmetric.dstu;
import java.io.IOException;
import java.security.SignatureException;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.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());
}
}
}
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