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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.operator;

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

import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.cryptopro.CryptoProObjectIdentifiers;
import org.spongycastle.asn1.nist.NISTObjectIdentifiers;
import org.spongycastle.asn1.ntt.NTTObjectIdentifiers;
import org.spongycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.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(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(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(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;
    }
}