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package org.bouncycastle.jce.provider;
import java.io.IOException;
import java.security.AlgorithmParameters;
import java.security.GeneralSecurityException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.Signature;
import java.security.SignatureException;
import java.security.spec.PSSParameterSpec;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Null;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERNull;
import org.bouncycastle.asn1.cryptopro.CryptoProObjectIdentifiers;
import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
import org.bouncycastle.asn1.oiw.OIWObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.RSASSAPSSparams;
import org.bouncycastle.asn1.teletrust.TeleTrusTObjectIdentifiers;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x9.X9ObjectIdentifiers;
class X509SignatureUtil
{
private static final ASN1Null derNull = DERNull.INSTANCE;
static void setSignatureParameters(
Signature signature,
ASN1Encodable params)
throws NoSuchAlgorithmException, SignatureException, InvalidKeyException
{
if (params != null && !derNull.equals(params))
{
AlgorithmParameters sigParams = AlgorithmParameters.getInstance(signature.getAlgorithm(), signature.getProvider());
try
{
sigParams.init(params.toASN1Primitive().getEncoded());
}
catch (IOException e)
{
throw new SignatureException("IOException decoding parameters: " + e.getMessage());
}
if (signature.getAlgorithm().endsWith("MGF1"))
{
try
{
signature.setParameter(sigParams.getParameterSpec(PSSParameterSpec.class));
}
catch (GeneralSecurityException e)
{
throw new SignatureException("Exception extracting parameters: " + e.getMessage());
}
}
}
}
static String getSignatureName(
AlgorithmIdentifier sigAlgId)
{
ASN1Encodable params = sigAlgId.getParameters();
if (params != null && !derNull.equals(params))
{
if (sigAlgId.getAlgorithm().equals(PKCSObjectIdentifiers.id_RSASSA_PSS))
{
RSASSAPSSparams rsaParams = RSASSAPSSparams.getInstance(params);
return getDigestAlgName(rsaParams.getHashAlgorithm().getAlgorithm()) + "withRSAandMGF1";
}
if (sigAlgId.getAlgorithm().equals(X9ObjectIdentifiers.ecdsa_with_SHA2))
{
ASN1Sequence ecDsaParams = ASN1Sequence.getInstance(params);
return getDigestAlgName(ASN1ObjectIdentifier.getInstance(ecDsaParams.getObjectAt(0))) + "withECDSA";
}
}
return sigAlgId.getAlgorithm().getId();
}
/**
* Return the digest algorithm using one of the standard JCA string
* representations rather the the algorithm identifier (if possible).
*/
private static String getDigestAlgName(
ASN1ObjectIdentifier digestAlgOID)
{
if (PKCSObjectIdentifiers.md5.equals(digestAlgOID))
{
return "MD5";
}
else if (OIWObjectIdentifiers.idSHA1.equals(digestAlgOID))
{
return "SHA1";
}
else if (NISTObjectIdentifiers.id_sha224.equals(digestAlgOID))
{
return "SHA224";
}
else if (NISTObjectIdentifiers.id_sha256.equals(digestAlgOID))
{
return "SHA256";
}
else if (NISTObjectIdentifiers.id_sha384.equals(digestAlgOID))
{
return "SHA384";
}
else if (NISTObjectIdentifiers.id_sha512.equals(digestAlgOID))
{
return "SHA512";
}
else if (TeleTrusTObjectIdentifiers.ripemd128.equals(digestAlgOID))
{
return "RIPEMD128";
}
else if (TeleTrusTObjectIdentifiers.ripemd160.equals(digestAlgOID))
{
return "RIPEMD160";
}
else if (TeleTrusTObjectIdentifiers.ripemd256.equals(digestAlgOID))
{
return "RIPEMD256";
}
else if (CryptoProObjectIdentifiers.gostR3411.equals(digestAlgOID))
{
return "GOST3411";
}
else
{
return digestAlgOID.getId();
}
}
}
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