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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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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();
    }
}