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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, S/MIME 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 and used appropriately.

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package org.bouncycastle.operator;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.cryptopro.CryptoProObjectIdentifiers;
import org.bouncycastle.asn1.kisa.KISAObjectIdentifiers;
import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
import org.bouncycastle.asn1.ntt.NTTObjectIdentifiers;
import org.bouncycastle.asn1.oiw.OIWObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.util.Integers;

public class DefaultSecretKeySizeProvider
    implements SecretKeySizeProvider
{
    public static final SecretKeySizeProvider INSTANCE = new DefaultSecretKeySizeProvider();

    private static final Map KEY_SIZES;

    static
    {
        Map keySizes = new HashMap();

        keySizes.put(new ASN1ObjectIdentifier("1.2.840.113533.7.66.10"), Integers.valueOf(128));

        keySizes.put(PKCSObjectIdentifiers.des_EDE3_CBC, Integers.valueOf(192));
        keySizes.put(PKCSObjectIdentifiers.id_alg_CMS3DESwrap, Integers.valueOf(192));

        keySizes.put(PKCSObjectIdentifiers.pbeWithSHA1AndDES_CBC, Integers.valueOf(64));
        keySizes.put(PKCSObjectIdentifiers.pbeWithMD5AndDES_CBC, Integers.valueOf(64));

        keySizes.put(NISTObjectIdentifiers.id_aes128_CBC, Integers.valueOf(128));
        keySizes.put(NISTObjectIdentifiers.id_aes192_CBC, Integers.valueOf(192));
        keySizes.put(NISTObjectIdentifiers.id_aes256_CBC, Integers.valueOf(256));
        keySizes.put(NISTObjectIdentifiers.id_aes128_GCM, Integers.valueOf(128));
        keySizes.put(NISTObjectIdentifiers.id_aes192_GCM, Integers.valueOf(192));
        keySizes.put(NISTObjectIdentifiers.id_aes256_GCM, Integers.valueOf(256));
        keySizes.put(NISTObjectIdentifiers.id_aes128_CCM, Integers.valueOf(128));
        keySizes.put(NISTObjectIdentifiers.id_aes192_CCM, Integers.valueOf(192));
        keySizes.put(NISTObjectIdentifiers.id_aes256_CCM, Integers.valueOf(256));
        keySizes.put(NISTObjectIdentifiers.id_aes128_wrap, Integers.valueOf(128));
        keySizes.put(NISTObjectIdentifiers.id_aes192_wrap, Integers.valueOf(192));
        keySizes.put(NISTObjectIdentifiers.id_aes256_wrap, Integers.valueOf(256));
        keySizes.put(NISTObjectIdentifiers.id_aes128_wrap_pad, Integers.valueOf(128));
        keySizes.put(NISTObjectIdentifiers.id_aes192_wrap_pad, Integers.valueOf(192));
        keySizes.put(NISTObjectIdentifiers.id_aes256_wrap_pad, Integers.valueOf(256));

        keySizes.put(NTTObjectIdentifiers.id_camellia128_cbc, Integers.valueOf(128));
        keySizes.put(NTTObjectIdentifiers.id_camellia192_cbc, Integers.valueOf(192));
        keySizes.put(NTTObjectIdentifiers.id_camellia256_cbc, Integers.valueOf(256));
        keySizes.put(NTTObjectIdentifiers.id_camellia128_wrap, Integers.valueOf(128));
        keySizes.put(NTTObjectIdentifiers.id_camellia192_wrap, Integers.valueOf(192));
        keySizes.put(NTTObjectIdentifiers.id_camellia256_wrap, Integers.valueOf(256));

        keySizes.put(KISAObjectIdentifiers.id_seedCBC, Integers.valueOf(128));

        keySizes.put(OIWObjectIdentifiers.desCBC, Integers.valueOf(64));

        keySizes.put(CryptoProObjectIdentifiers.gostR28147_gcfb, Integers.valueOf(256));

        KEY_SIZES = Collections.unmodifiableMap(keySizes);
    }

    public int getKeySize(AlgorithmIdentifier algorithmIdentifier)
    {
        int keySize = getKeySize(algorithmIdentifier.getAlgorithm());

        // just need the OID
        if (keySize > 0)
        {
            return keySize;
        }

        // TODO: support OID/Parameter key sizes (e.g. RC2).

        return -1;
    }

    public int getKeySize(ASN1ObjectIdentifier algorithm)
    {
        Integer keySize = (Integer)KEY_SIZES.get(algorithm);

        if (keySize != null)
        {
            return keySize.intValue();
        }

        return -1;
    }
}