org.bouncycastle.eac.operator.jcajce.JcaEACSignatureVerifierBuilder Maven / Gradle / Ivy

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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.4. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.
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package org.bouncycastle.eac.operator.jcajce;

import java.io.IOException;
import java.io.OutputStream;
import java.math.BigInteger;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.Provider;
import java.security.PublicKey;
import java.security.Signature;
import java.security.SignatureException;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.eac.EACObjectIdentifiers;
import org.bouncycastle.eac.operator.EACSignatureVerifier;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.operator.OperatorStreamException;
import org.bouncycastle.operator.RuntimeOperatorException;

public class JcaEACSignatureVerifierBuilder
{
    private EACHelper helper = new DefaultEACHelper();

    public JcaEACSignatureVerifierBuilder setProvider(String providerName)
    {
        this.helper = new NamedEACHelper(providerName);

        return this;
    }

    public JcaEACSignatureVerifierBuilder setProvider(Provider provider)
    {
        this.helper = new ProviderEACHelper(provider);

        return this;
    }

    public EACSignatureVerifier build(final ASN1ObjectIdentifier usageOid, PublicKey pubKey)
        throws OperatorCreationException
    {
        Signature sig;
        try
        {
            sig = helper.getSignature(usageOid);

            sig.initVerify(pubKey);
        }
        catch (NoSuchAlgorithmException e)
        {
            throw new OperatorCreationException("unable to find algorithm: " + e.getMessage(), e);
        }
        catch (NoSuchProviderException e)
        {
            throw new OperatorCreationException("unable to find provider: " + e.getMessage(), e);
        }
        catch (InvalidKeyException e)
        {
            throw new OperatorCreationException("invalid key: " + e.getMessage(), e);
        }

        final SignatureOutputStream sigStream = new SignatureOutputStream(sig);

        return new EACSignatureVerifier()
        {
            public ASN1ObjectIdentifier getUsageIdentifier()
            {
                return usageOid;
            }

            public OutputStream getOutputStream()
            {
                return sigStream;
            }

            public boolean verify(byte[] expected)
            {
                try
                {
                    if (usageOid.on(EACObjectIdentifiers.id_TA_ECDSA))
                    {
                        try
                        {
                            byte[] reencoded = derEncode(expected);

                            return sigStream.verify(reencoded);
                        }
                        catch (Exception e)
                        {
                            return false;
                        }
                    }
                    else
                    {
                        return sigStream.verify(expected);
                    }
                }
                catch (SignatureException e)
                {
                    throw new RuntimeOperatorException("exception obtaining signature: " + e.getMessage(), e);
                }
            }
        };
    }

    private static byte[] derEncode(byte[] rawSign) throws IOException
    {
        int len = rawSign.length / 2;

        byte[] r = new byte[len];
        byte[] s = new byte[len];
        System.arraycopy(rawSign, 0, r, 0, len);
        System.arraycopy(rawSign, len, s, 0, len);

        ASN1EncodableVector v = new ASN1EncodableVector();
        v.add(new ASN1Integer(new BigInteger(1, r)));
        v.add(new ASN1Integer(new BigInteger(1, s)));

        DERSequence seq = new DERSequence(v);
        return seq.getEncoded();
    }

    private static class SignatureOutputStream
        extends OutputStream
    {
        private Signature sig;

        SignatureOutputStream(Signature sig)
        {
            this.sig = sig;
        }

        public void write(byte[] bytes, int off, int len)
            throws IOException
        {
            try
            {
                sig.update(bytes, off, len);
            }
            catch (SignatureException e)
            {
                throw new OperatorStreamException("exception in content signer: " + e.getMessage(), e);
            }
        }

        public void write(byte[] bytes)
            throws IOException
        {
            try
            {
                sig.update(bytes);
            }
            catch (SignatureException e)
            {
                throw new OperatorStreamException("exception in content signer: " + e.getMessage(), e);
            }
        }

        public void write(int b)
            throws IOException
        {
            try
            {
                sig.update((byte)b);
            }
            catch (SignatureException e)
            {
                throw new OperatorStreamException("exception in content signer: " + e.getMessage(), e);
            }
        }

        boolean verify(byte[] expected)
            throws SignatureException
        {
            return sig.verify(expected);
        }
    }
}