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package org.bouncycastle.ocsp;

import org.bouncycastle.asn1.DERNull;
import org.bouncycastle.asn1.DERObjectIdentifier;
import org.bouncycastle.asn1.cryptopro.CryptoProObjectIdentifiers;
import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.teletrust.TeleTrusTObjectIdentifiers;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x9.X9ObjectIdentifiers;
import org.bouncycastle.util.Strings;

import java.security.InvalidAlgorithmParameterException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.Signature;
import java.security.cert.CertStore;
import java.security.cert.CertStoreParameters;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

class OCSPUtil
{
    private static Hashtable algorithms = new Hashtable();
    private static Hashtable oids = new Hashtable();
    private static Set       noParams = new HashSet();
    
    static
    {   
        algorithms.put("MD2WITHRSAENCRYPTION", PKCSObjectIdentifiers.md2WithRSAEncryption);
        algorithms.put("MD2WITHRSA", PKCSObjectIdentifiers.md2WithRSAEncryption);
        algorithms.put("MD5WITHRSAENCRYPTION", PKCSObjectIdentifiers.md5WithRSAEncryption);
        algorithms.put("MD5WITHRSA", PKCSObjectIdentifiers.md5WithRSAEncryption);
        algorithms.put("SHA1WITHRSAENCRYPTION", PKCSObjectIdentifiers.sha1WithRSAEncryption);
        algorithms.put("SHA1WITHRSA", PKCSObjectIdentifiers.sha1WithRSAEncryption);
        algorithms.put("SHA224WITHRSAENCRYPTION", PKCSObjectIdentifiers.sha224WithRSAEncryption);
        algorithms.put("SHA224WITHRSA", PKCSObjectIdentifiers.sha224WithRSAEncryption);
        algorithms.put("SHA256WITHRSAENCRYPTION", PKCSObjectIdentifiers.sha256WithRSAEncryption);
        algorithms.put("SHA256WITHRSA", PKCSObjectIdentifiers.sha256WithRSAEncryption);
        algorithms.put("SHA384WITHRSAENCRYPTION", PKCSObjectIdentifiers.sha384WithRSAEncryption);
        algorithms.put("SHA384WITHRSA", PKCSObjectIdentifiers.sha384WithRSAEncryption);
        algorithms.put("SHA512WITHRSAENCRYPTION", PKCSObjectIdentifiers.sha512WithRSAEncryption);
        algorithms.put("SHA512WITHRSA", PKCSObjectIdentifiers.sha512WithRSAEncryption);
        algorithms.put("RIPEMD160WITHRSAENCRYPTION", TeleTrusTObjectIdentifiers.rsaSignatureWithripemd160);
        algorithms.put("RIPEMD160WITHRSA", TeleTrusTObjectIdentifiers.rsaSignatureWithripemd160);
        algorithms.put("RIPEMD128WITHRSAENCRYPTION", TeleTrusTObjectIdentifiers.rsaSignatureWithripemd128);
        algorithms.put("RIPEMD128WITHRSA", TeleTrusTObjectIdentifiers.rsaSignatureWithripemd128);
        algorithms.put("RIPEMD256WITHRSAENCRYPTION", TeleTrusTObjectIdentifiers.rsaSignatureWithripemd256);
        algorithms.put("RIPEMD256WITHRSA", TeleTrusTObjectIdentifiers.rsaSignatureWithripemd256);
        algorithms.put("SHA1WITHDSA", X9ObjectIdentifiers.id_dsa_with_sha1);
        algorithms.put("DSAWITHSHA1", X9ObjectIdentifiers.id_dsa_with_sha1);
        algorithms.put("SHA224WITHDSA", NISTObjectIdentifiers.dsa_with_sha224);
        algorithms.put("SHA256WITHDSA", NISTObjectIdentifiers.dsa_with_sha256);
        algorithms.put("SHA1WITHECDSA", X9ObjectIdentifiers.ecdsa_with_SHA1);
        algorithms.put("ECDSAWITHSHA1", X9ObjectIdentifiers.ecdsa_with_SHA1);
        algorithms.put("SHA224WITHECDSA", X9ObjectIdentifiers.ecdsa_with_SHA224);
        algorithms.put("SHA256WITHECDSA", X9ObjectIdentifiers.ecdsa_with_SHA256);
        algorithms.put("SHA384WITHECDSA", X9ObjectIdentifiers.ecdsa_with_SHA384);
        algorithms.put("SHA512WITHECDSA", X9ObjectIdentifiers.ecdsa_with_SHA512);
        algorithms.put("GOST3411WITHGOST3410", CryptoProObjectIdentifiers.gostR3411_94_with_gostR3410_94);
        algorithms.put("GOST3411WITHGOST3410-94", CryptoProObjectIdentifiers.gostR3411_94_with_gostR3410_94);

        oids.put(PKCSObjectIdentifiers.md2WithRSAEncryption, "MD2WITHRSA");
        oids.put(PKCSObjectIdentifiers.md5WithRSAEncryption, "MD5WITHRSA");
        oids.put(PKCSObjectIdentifiers.sha1WithRSAEncryption, "SHA1WITHRSA");
        oids.put(PKCSObjectIdentifiers.sha224WithRSAEncryption, "SHA224WITHRSA");
        oids.put(PKCSObjectIdentifiers.sha256WithRSAEncryption, "SHA256WITHRSA");
        oids.put(PKCSObjectIdentifiers.sha384WithRSAEncryption, "SHA384WITHRSA");
        oids.put(PKCSObjectIdentifiers.sha512WithRSAEncryption, "SHA512WITHRSA");
        oids.put(TeleTrusTObjectIdentifiers.rsaSignatureWithripemd160, "RIPEMD160WITHRSA");
        oids.put(TeleTrusTObjectIdentifiers.rsaSignatureWithripemd128, "RIPEMD128WITHRSA");
        oids.put(TeleTrusTObjectIdentifiers.rsaSignatureWithripemd256, "RIPEMD256WITHRSA");
        oids.put(X9ObjectIdentifiers.id_dsa_with_sha1, "SHA1WITHDSA");
        oids.put(NISTObjectIdentifiers.dsa_with_sha224, "SHA224WITHDSA");
        oids.put(NISTObjectIdentifiers.dsa_with_sha256, "SHA256WITHDSA");
        oids.put(X9ObjectIdentifiers.ecdsa_with_SHA1, "SHA1WITHECDSA");
        oids.put(X9ObjectIdentifiers.ecdsa_with_SHA224, "SHA224WITHECDSA");
        oids.put(X9ObjectIdentifiers.ecdsa_with_SHA256, "SHA256WITHECDSA");
        oids.put(X9ObjectIdentifiers.ecdsa_with_SHA384, "SHA384WITHECDSA");
        oids.put(X9ObjectIdentifiers.ecdsa_with_SHA512, "SHA512WITHECDSA");
        oids.put(CryptoProObjectIdentifiers.gostR3411_94_with_gostR3410_94, "GOST3411WITHGOST3410");

        //
        // According to RFC 3279, the ASN.1 encoding SHALL (id-dsa-with-sha1) or MUST (ecdsa-with-SHA*) omit the parameters field. 
        // The parameters field SHALL be NULL for RSA based signature algorithms.
        //
        noParams.add(X9ObjectIdentifiers.ecdsa_with_SHA1);
        noParams.add(X9ObjectIdentifiers.ecdsa_with_SHA224);
        noParams.add(X9ObjectIdentifiers.ecdsa_with_SHA256);
        noParams.add(X9ObjectIdentifiers.ecdsa_with_SHA384);
        noParams.add(X9ObjectIdentifiers.ecdsa_with_SHA512);
        noParams.add(X9ObjectIdentifiers.id_dsa_with_sha1);
        noParams.add(NISTObjectIdentifiers.dsa_with_sha224);
        noParams.add(NISTObjectIdentifiers.dsa_with_sha256);
    }
     
    static DERObjectIdentifier getAlgorithmOID(
        String algorithmName)
    {
        algorithmName = Strings.toUpperCase(algorithmName);
        
        if (algorithms.containsKey(algorithmName))
        {
            return (DERObjectIdentifier)algorithms.get(algorithmName);
        }
        
        return new DERObjectIdentifier(algorithmName);
    }

    static String getAlgorithmName(
        DERObjectIdentifier oid)
    {
        if (oids.containsKey(oid))
        {
            return (String)oids.get(oid);
        }
        
        return oid.getId();
    }
    
    static AlgorithmIdentifier getSigAlgID(
        DERObjectIdentifier sigOid)
    {
        if (noParams.contains(sigOid))
        {
            return new AlgorithmIdentifier(sigOid);
        }
        else
        {
            return new AlgorithmIdentifier(sigOid, new DERNull());
        }
    }
    
    static Iterator getAlgNames()
    {
        Enumeration e = algorithms.keys();
        List        l = new ArrayList();
        
        while (e.hasMoreElements())
        {
            l.add(e.nextElement());
        }
        
        return l.iterator();
    }

    static CertStore createCertStoreInstance(String type, CertStoreParameters params, String provider)
        throws InvalidAlgorithmParameterException, NoSuchAlgorithmException, NoSuchProviderException
    {
        if (provider == null)
        {
            return CertStore.getInstance(type, params);
        }

        return CertStore.getInstance(type, params, provider);
    }

    static MessageDigest createDigestInstance(String digestName, String provider)
        throws NoSuchAlgorithmException, NoSuchProviderException
    {
        if (provider == null)
        {
            return MessageDigest.getInstance(digestName);
        }

        return MessageDigest.getInstance(digestName, provider);
    }

    static Signature createSignatureInstance(String sigName, String provider)
        throws NoSuchAlgorithmException, NoSuchProviderException
    {
        if (provider == null)
        {
            return Signature.getInstance(sigName);
        }

        return Signature.getInstance(sigName, provider);
    }

    static CertificateFactory createX509CertificateFactory(String provider)
        throws CertificateException, NoSuchProviderException
    {
        if (provider == null)
        {
            return CertificateFactory.getInstance("X.509");
        }

        return CertificateFactory.getInstance("X.509", provider);
    }
}