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/* GENERATED SOURCE. DO NOT MODIFY. */
package com.android.internal.org.bouncycastle.operator.jcajce;
import java.io.IOException;
import java.io.OutputStream;
import java.security.GeneralSecurityException;
import java.security.PrivateKey;
import java.security.Provider;
import java.security.SecureRandom;
import java.security.Signature;
import java.security.SignatureException;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.MGF1ParameterSpec;
import java.security.spec.PSSParameterSpec;
import java.util.List;
import com.android.internal.org.bouncycastle.asn1.ASN1EncodableVector;
import com.android.internal.org.bouncycastle.asn1.ASN1Encoding;
import com.android.internal.org.bouncycastle.asn1.ASN1Integer;
import com.android.internal.org.bouncycastle.asn1.ASN1Sequence;
import com.android.internal.org.bouncycastle.asn1.DERBitString;
import com.android.internal.org.bouncycastle.asn1.DERSequence;
import com.android.internal.org.bouncycastle.asn1.misc.MiscObjectIdentifiers;
import com.android.internal.org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import com.android.internal.org.bouncycastle.asn1.pkcs.RSASSAPSSparams;
import com.android.internal.org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import com.android.internal.org.bouncycastle.jcajce.CompositePrivateKey;
import com.android.internal.org.bouncycastle.jcajce.io.OutputStreamFactory;
import com.android.internal.org.bouncycastle.jcajce.spec.CompositeAlgorithmSpec;
import com.android.internal.org.bouncycastle.jcajce.util.DefaultJcaJceHelper;
import com.android.internal.org.bouncycastle.jcajce.util.NamedJcaJceHelper;
import com.android.internal.org.bouncycastle.jcajce.util.ProviderJcaJceHelper;
import com.android.internal.org.bouncycastle.operator.ContentSigner;
import com.android.internal.org.bouncycastle.operator.DefaultDigestAlgorithmIdentifierFinder;
import com.android.internal.org.bouncycastle.operator.DefaultSignatureAlgorithmIdentifierFinder;
import com.android.internal.org.bouncycastle.operator.DigestAlgorithmIdentifierFinder;
import com.android.internal.org.bouncycastle.operator.OperatorCreationException;
import com.android.internal.org.bouncycastle.operator.RuntimeOperatorException;
import com.android.internal.org.bouncycastle.operator.SignatureAlgorithmIdentifierFinder;
import com.android.internal.org.bouncycastle.util.io.TeeOutputStream;
/**
* @hide This class is not part of the Android public SDK API
*/
public class JcaContentSignerBuilder
{
private OperatorHelper helper = new OperatorHelper(new DefaultJcaJceHelper());
private SecureRandom random;
private String signatureAlgorithm;
private AlgorithmIdentifier sigAlgId;
private AlgorithmParameterSpec sigAlgSpec;
public JcaContentSignerBuilder(String signatureAlgorithm)
{
this.signatureAlgorithm = signatureAlgorithm;
this.sigAlgId = new DefaultSignatureAlgorithmIdentifierFinder().find(signatureAlgorithm);
this.sigAlgSpec = null;
}
public JcaContentSignerBuilder(String signatureAlgorithm, AlgorithmParameterSpec sigParamSpec)
{
this.signatureAlgorithm = signatureAlgorithm;
if (sigParamSpec instanceof PSSParameterSpec)
{
PSSParameterSpec pssSpec = (PSSParameterSpec)sigParamSpec;
this.sigAlgSpec = pssSpec;
this.sigAlgId = new AlgorithmIdentifier(
PKCSObjectIdentifiers.id_RSASSA_PSS, createPSSParams(pssSpec));
}
else if (sigParamSpec instanceof CompositeAlgorithmSpec)
{
CompositeAlgorithmSpec compSpec = (CompositeAlgorithmSpec)sigParamSpec;
this.sigAlgSpec = compSpec;
this.sigAlgId = new AlgorithmIdentifier(
MiscObjectIdentifiers.id_alg_composite, createCompParams(compSpec));
}
else
{
throw new IllegalArgumentException("unknown sigParamSpec: "
+ ((sigParamSpec == null) ? "null" : sigParamSpec.getClass().getName()));
}
}
public JcaContentSignerBuilder setProvider(Provider provider)
{
this.helper = new OperatorHelper(new ProviderJcaJceHelper(provider));
return this;
}
public JcaContentSignerBuilder setProvider(String providerName)
{
this.helper = new OperatorHelper(new NamedJcaJceHelper(providerName));
return this;
}
public JcaContentSignerBuilder setSecureRandom(SecureRandom random)
{
this.random = random;
return this;
}
public ContentSigner build(PrivateKey privateKey)
throws OperatorCreationException
{
if (privateKey instanceof CompositePrivateKey)
{
return buildComposite((CompositePrivateKey)privateKey);
}
try
{
final Signature sig = helper.createSignature(sigAlgId);
final AlgorithmIdentifier signatureAlgId = sigAlgId;
if (random != null)
{
sig.initSign(privateKey, random);
}
else
{
sig.initSign(privateKey);
}
return new ContentSigner()
{
private OutputStream stream = OutputStreamFactory.createStream(sig);
public AlgorithmIdentifier getAlgorithmIdentifier()
{
return signatureAlgId;
}
public OutputStream getOutputStream()
{
return stream;
}
public byte[] getSignature()
{
try
{
return sig.sign();
}
catch (SignatureException e)
{
throw new RuntimeOperatorException("exception obtaining signature: " + e.getMessage(), e);
}
}
};
}
catch (GeneralSecurityException e)
{
throw new OperatorCreationException("cannot create signer: " + e.getMessage(), e);
}
}
private ContentSigner buildComposite(CompositePrivateKey privateKey)
throws OperatorCreationException
{
try
{
List<PrivateKey> privateKeys = privateKey.getPrivateKeys();
final ASN1Sequence sigAlgIds = ASN1Sequence.getInstance(sigAlgId.getParameters());
final Signature[] sigs = new Signature[sigAlgIds.size()];
for (int i = 0; i != sigAlgIds.size(); i++)
{
sigs[i] = helper.createSignature(AlgorithmIdentifier.getInstance(sigAlgIds.getObjectAt(i)));
if (random != null)
{
sigs[i].initSign(privateKeys.get(i), random);
}
else
{
sigs[i].initSign(privateKeys.get(i));
}
}
OutputStream sStream = OutputStreamFactory.createStream(sigs[0]);
for (int i = 1; i != sigs.length; i++)
{
sStream = new TeeOutputStream(sStream, OutputStreamFactory.createStream(sigs[i]));
}
final OutputStream sigStream = sStream;
return new ContentSigner()
{
OutputStream stream = sigStream;
public AlgorithmIdentifier getAlgorithmIdentifier()
{
return sigAlgId;
}
public OutputStream getOutputStream()
{
return stream;
}
public byte[] getSignature()
{
try
{
ASN1EncodableVector sigV = new ASN1EncodableVector();
for (int i = 0; i != sigs.length; i++)
{
sigV.add(new DERBitString(sigs[i].sign()));
}
return new DERSequence(sigV).getEncoded(ASN1Encoding.DER);
}
catch (IOException e)
{
throw new RuntimeOperatorException("exception encoding signature: " + e.getMessage(), e);
}
catch (SignatureException e)
{
throw new RuntimeOperatorException("exception obtaining signature: " + e.getMessage(), e);
}
}
};
}
catch (GeneralSecurityException e)
{
throw new OperatorCreationException("cannot create signer: " + e.getMessage(), e);
}
}
private static RSASSAPSSparams createPSSParams(PSSParameterSpec pssSpec)
{
DigestAlgorithmIdentifierFinder digFinder = new DefaultDigestAlgorithmIdentifierFinder();
AlgorithmIdentifier digId = digFinder.find(pssSpec.getDigestAlgorithm());
AlgorithmIdentifier mgfDig = digFinder.find(((MGF1ParameterSpec)pssSpec.getMGFParameters()).getDigestAlgorithm());
return new RSASSAPSSparams(
digId,
new AlgorithmIdentifier(PKCSObjectIdentifiers.id_mgf1, mgfDig),
new ASN1Integer(pssSpec.getSaltLength()),
new ASN1Integer(pssSpec.getTrailerField()));
}
private static ASN1Sequence createCompParams(CompositeAlgorithmSpec compSpec)
{
SignatureAlgorithmIdentifierFinder algFinder = new DefaultSignatureAlgorithmIdentifierFinder();
ASN1EncodableVector v = new ASN1EncodableVector();
List<String> algorithmNames = compSpec.getAlgorithmNames();
List<AlgorithmParameterSpec> algorithmSpecs = compSpec.getParameterSpecs();
for (int i = 0; i != algorithmNames.size(); i++)
{
AlgorithmParameterSpec sigSpec = algorithmSpecs.get(i);
if (sigSpec == null)
{
v.add(algFinder.find(algorithmNames.get(i)));
}
else if (sigSpec instanceof PSSParameterSpec)
{
v.add(createPSSParams((PSSParameterSpec)sigSpec));
}
else
{
throw new IllegalArgumentException("unrecognized parameterSpec");
}
}
return new DERSequence(v);
}
}
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