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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.pkcs;

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

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

class PKCSUtils
{
    private static final Map PRFS_SALT = new HashMap();

    static
    {
        PRFS_SALT.put(PKCSObjectIdentifiers.id_hmacWithSHA1, Integers.valueOf(20));
        PRFS_SALT.put(PKCSObjectIdentifiers.id_hmacWithSHA256, Integers.valueOf(32));
        PRFS_SALT.put(PKCSObjectIdentifiers.id_hmacWithSHA512, Integers.valueOf(64));
        PRFS_SALT.put(PKCSObjectIdentifiers.id_hmacWithSHA224, Integers.valueOf(28));
        PRFS_SALT.put(PKCSObjectIdentifiers.id_hmacWithSHA384, Integers.valueOf(48));
//        PRFS_SALT.put(NISTObjectIdentifiers.id_hmacWithSHA3_224, Integers.valueOf(28));
//        PRFS_SALT.put(NISTObjectIdentifiers.id_hmacWithSHA3_256, Integers.valueOf(32));
//        PRFS_SALT.put(NISTObjectIdentifiers.id_hmacWithSHA3_384, Integers.valueOf(48));
//        PRFS_SALT.put(NISTObjectIdentifiers.id_hmacWithSHA3_512, Integers.valueOf(64));
        PRFS_SALT.put(CryptoProObjectIdentifiers.gostR3411Hmac, Integers.valueOf(32));
    }

    static int getSaltSize(ASN1ObjectIdentifier algorithm)
    {
        if (!PRFS_SALT.containsKey(algorithm))
        {
            throw new IllegalStateException("no salt size for algorithm: " + algorithm);
        }

        return ((Integer)PRFS_SALT.get(algorithm)).intValue();
    }
}