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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified.

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package org.bouncycastle.openssl;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.util.Integers;

final class PEMUtilities
{
    private static final Map KEYSIZES = new HashMap();
    private static final Set PKCS5_SCHEME_1 = new HashSet();
    private static final Set PKCS5_SCHEME_2 = new HashSet();

    static
    {
        PKCS5_SCHEME_1.add(PKCSObjectIdentifiers.pbeWithMD2AndDES_CBC);
        PKCS5_SCHEME_1.add(PKCSObjectIdentifiers.pbeWithMD2AndRC2_CBC);
        PKCS5_SCHEME_1.add(PKCSObjectIdentifiers.pbeWithMD5AndDES_CBC);
        PKCS5_SCHEME_1.add(PKCSObjectIdentifiers.pbeWithMD5AndRC2_CBC);
        PKCS5_SCHEME_1.add(PKCSObjectIdentifiers.pbeWithSHA1AndDES_CBC);
        PKCS5_SCHEME_1.add(PKCSObjectIdentifiers.pbeWithSHA1AndRC2_CBC);

        PKCS5_SCHEME_2.add(PKCSObjectIdentifiers.id_PBES2);
        PKCS5_SCHEME_2.add(PKCSObjectIdentifiers.des_EDE3_CBC);
        PKCS5_SCHEME_2.add(NISTObjectIdentifiers.id_aes128_CBC);
        PKCS5_SCHEME_2.add(NISTObjectIdentifiers.id_aes192_CBC);
        PKCS5_SCHEME_2.add(NISTObjectIdentifiers.id_aes256_CBC);

        KEYSIZES.put(PKCSObjectIdentifiers.des_EDE3_CBC.getId(), Integers.valueOf(192));
        KEYSIZES.put(NISTObjectIdentifiers.id_aes128_CBC.getId(), Integers.valueOf(128));
        KEYSIZES.put(NISTObjectIdentifiers.id_aes192_CBC.getId(), Integers.valueOf(192));
        KEYSIZES.put(NISTObjectIdentifiers.id_aes256_CBC.getId(), Integers.valueOf(256));
    }

    static int getKeySize(String algorithm)
    {
        if (!KEYSIZES.containsKey(algorithm))
        {
            throw new IllegalStateException("no key size for algorithm: " + algorithm);
        }
        
        return ((Integer)KEYSIZES.get(algorithm)).intValue();
    }

    static boolean isPKCS5Scheme1(ASN1ObjectIdentifier algOid)
    {
        return PKCS5_SCHEME_1.contains(algOid);
    }

    public static boolean isPKCS5Scheme2(ASN1ObjectIdentifier algOid)
    {
        return PKCS5_SCHEME_2.contains(algOid);
    }

    public static boolean isPKCS12(ASN1ObjectIdentifier algOid)
    {
        return algOid.getId().startsWith(PKCSObjectIdentifiers.pkcs_12PbeIds.getId());
    }
}