org.spongycastle.cms.jcajce.JcePasswordEnvelopedRecipient Maven / Gradle / Ivy

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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.cms.jcajce;

import java.io.InputStream;
import java.security.Key;

import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;

import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.cms.CMSException;
import org.spongycastle.cms.RecipientOperator;
import org.spongycastle.operator.InputDecryptor;

public class JcePasswordEnvelopedRecipient
    extends JcePasswordRecipient
{
    public JcePasswordEnvelopedRecipient(char[] password)
    {
        super(password);
    }

    public RecipientOperator getRecipientOperator(AlgorithmIdentifier keyEncryptionAlgorithm, final AlgorithmIdentifier contentEncryptionAlgorithm, byte[] derivedKey, byte[] encryptedContentEncryptionKey)
        throws CMSException
    {
        Key secretKey = extractSecretKey(keyEncryptionAlgorithm, contentEncryptionAlgorithm, derivedKey, encryptedContentEncryptionKey);

        final Cipher dataCipher = helper.createContentCipher(secretKey, contentEncryptionAlgorithm);

        return new RecipientOperator(new InputDecryptor()
        {
            public AlgorithmIdentifier getAlgorithmIdentifier()
            {
                return contentEncryptionAlgorithm;
            }

            public InputStream getInputStream(InputStream dataOut)
            {
                return new CipherInputStream(dataOut, dataCipher);
            }
        });
    }
}