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package org.spongycastle.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.PrivateKey;
import java.security.Provider;
import java.security.Signature;
import java.security.SignatureException;
import java.util.Arrays;
import java.util.Hashtable;
import org.spongycastle.asn1.ASN1Integer;
import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.ASN1Sequence;
import org.spongycastle.asn1.eac.EACObjectIdentifiers;
import org.spongycastle.eac.operator.EACSigner;
import org.spongycastle.operator.OperatorCreationException;
import org.spongycastle.operator.OperatorStreamException;
import org.spongycastle.operator.RuntimeOperatorException;
public class JcaEACSignerBuilder
{
private static final Hashtable sigNames = new Hashtable();
static
{
sigNames.put("SHA1withRSA", EACObjectIdentifiers.id_TA_RSA_v1_5_SHA_1);
sigNames.put("SHA256withRSA", EACObjectIdentifiers.id_TA_RSA_v1_5_SHA_256);
sigNames.put("SHA1withRSAandMGF1", EACObjectIdentifiers.id_TA_RSA_PSS_SHA_1);
sigNames.put("SHA256withRSAandMGF1", EACObjectIdentifiers.id_TA_RSA_PSS_SHA_256);
sigNames.put("SHA512withRSA", EACObjectIdentifiers.id_TA_RSA_v1_5_SHA_512);
sigNames.put("SHA512withRSAandMGF1", EACObjectIdentifiers.id_TA_RSA_PSS_SHA_512);
sigNames.put("SHA1withECDSA", EACObjectIdentifiers.id_TA_ECDSA_SHA_1);
sigNames.put("SHA224withECDSA", EACObjectIdentifiers.id_TA_ECDSA_SHA_224);
sigNames.put("SHA256withECDSA", EACObjectIdentifiers.id_TA_ECDSA_SHA_256);
sigNames.put("SHA384withECDSA", EACObjectIdentifiers.id_TA_ECDSA_SHA_384);
sigNames.put("SHA512withECDSA", EACObjectIdentifiers.id_TA_ECDSA_SHA_512);
}
private EACHelper helper = new DefaultEACHelper();
public JcaEACSignerBuilder setProvider(String providerName)
{
this.helper = new NamedEACHelper(providerName);
return this;
}
public JcaEACSignerBuilder setProvider(Provider provider)
{
this.helper = new ProviderEACHelper(provider);
return this;
}
public EACSigner build(String algorithm, PrivateKey privKey)
throws OperatorCreationException
{
return build((ASN1ObjectIdentifier)sigNames.get(algorithm), privKey);
}
public EACSigner build(final ASN1ObjectIdentifier usageOid, PrivateKey privKey)
throws OperatorCreationException
{
Signature sig;
try
{
sig = helper.getSignature(usageOid);
sig.initSign(privKey);
}
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 EACSigner()
{
public ASN1ObjectIdentifier getUsageIdentifier()
{
return usageOid;
}
public OutputStream getOutputStream()
{
return sigStream;
}
public byte[] getSignature()
{
try
{
byte[] signature = sigStream.getSignature();
if (usageOid.on(EACObjectIdentifiers.id_TA_ECDSA))
{
return reencode(signature);
}
return signature;
}
catch (SignatureException e)
{
throw new RuntimeOperatorException("exception obtaining signature: " + e.getMessage(), e);
}
}
};
}
public static int max(int el1, int el2)
{
return el1 > el2 ? el1 : el2;
}
private static byte[] reencode(byte[] rawSign)
{
ASN1Sequence sData = ASN1Sequence.getInstance(rawSign);
BigInteger r = ASN1Integer.getInstance(sData.getObjectAt(0)).getValue();
BigInteger s = ASN1Integer.getInstance(sData.getObjectAt(1)).getValue();
byte[] rB = r.toByteArray();
byte[] sB = s.toByteArray();
int rLen = unsignedIntLength(rB);
int sLen = unsignedIntLength(sB);
byte[] ret;
int len = max(rLen, sLen);
ret = new byte[len * 2];
Arrays.fill(ret, (byte)0);
copyUnsignedInt(rB, ret, len - rLen);
copyUnsignedInt(sB, ret, 2 * len - sLen);
return ret;
}
private static int unsignedIntLength(byte[] i)
{
int len = i.length;
if (i[0] == 0)
{
len--;
}
return len;
}
private static void copyUnsignedInt(byte[] src, byte[] dst, int offset)
{
int len = src.length;
int readoffset = 0;
if (src[0] == 0)
{
len--;
readoffset = 1;
}
System.arraycopy(src, readoffset, dst, offset, len);
}
private 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);
}
}
byte[] getSignature()
throws SignatureException
{
return sig.sign();
}
}
}
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