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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.cms;

import org.bouncycastle.asn1.DERNull;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

public interface PasswordRecipient
    extends Recipient
{
    public static final int PKCS5_SCHEME2 = 0;
    public static final int PKCS5_SCHEME2_UTF8 = 1;

    static final class PRF
    {
        public static final PRF HMacSHA1 = new PRF("HMacSHA1", new AlgorithmIdentifier(PKCSObjectIdentifiers.id_hmacWithSHA1, DERNull.INSTANCE));
        public static final PRF HMacSHA224 = new PRF("HMacSHA224", new AlgorithmIdentifier(PKCSObjectIdentifiers.id_hmacWithSHA224, DERNull.INSTANCE));
        public static final PRF HMacSHA256 = new PRF("HMacSHA256", new AlgorithmIdentifier(PKCSObjectIdentifiers.id_hmacWithSHA256, DERNull.INSTANCE));
        public static final PRF HMacSHA384 = new PRF("HMacSHA384", new AlgorithmIdentifier(PKCSObjectIdentifiers.id_hmacWithSHA384, DERNull.INSTANCE));
        public static final PRF HMacSHA512 = new PRF("HMacSHA512", new AlgorithmIdentifier(PKCSObjectIdentifiers.id_hmacWithSHA512, DERNull.INSTANCE));

        private final String hmac;
        final AlgorithmIdentifier prfAlgID;

        private PRF(String hmac, AlgorithmIdentifier prfAlgID)
        {
            this.hmac = hmac;
            this.prfAlgID = prfAlgID;
        }

        public String getName()
        {
            return hmac;
        }

        public AlgorithmIdentifier getAlgorithmID()
        {
            return prfAlgID;
        }
    }

    byte[] calculateDerivedKey(int schemeID, AlgorithmIdentifier derivationAlgorithm, int keySize)
        throws CMSException;

    RecipientOperator getRecipientOperator(AlgorithmIdentifier keyEncryptionAlgorithm, AlgorithmIdentifier contentEncryptionAlgorithm, byte[] derivedKey, byte[] encryptedEncryptedContentKey)
        throws CMSException;

    int getPasswordConversionScheme();

    char[] getPassword();
}