org.bouncycastle.cms.bc.BcPasswordRecipient Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of bcpkix-jdk15on Show documentation

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.

There is a newer version: 1.70

Show newest version

package org.bouncycastle.cms.bc;

import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.cms.PasswordRecipient;
import org.bouncycastle.crypto.InvalidCipherTextException;
import org.bouncycastle.crypto.Wrapper;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.crypto.params.ParametersWithIV;

/**
 * the RecipientInfo class for a recipient who has been sent a message
 * encrypted using a password.
 */
public abstract class BcPasswordRecipient
    implements PasswordRecipient
{
    private int schemeID = PasswordRecipient.PKCS5_SCHEME2_UTF8;
    private char[] password;

    BcPasswordRecipient(
        char[] password)
    {
        this.password = password;
    }

    public BcPasswordRecipient setPasswordConversionScheme(int schemeID)
    {
        this.schemeID = schemeID;

        return this;
    }

    protected KeyParameter extractSecretKey(AlgorithmIdentifier keyEncryptionAlgorithm, AlgorithmIdentifier contentEncryptionAlgorithm, byte[] derivedKey, byte[] encryptedContentEncryptionKey)
        throws CMSException
    {
        Wrapper keyEncryptionCipher = EnvelopedDataHelper.createRFC3211Wrapper(keyEncryptionAlgorithm.getAlgorithm());

        keyEncryptionCipher.init(false, new ParametersWithIV(new KeyParameter(derivedKey), ASN1OctetString.getInstance(keyEncryptionAlgorithm.getParameters()).getOctets()));

        try
        {
            return new KeyParameter(keyEncryptionCipher.unwrap(encryptedContentEncryptionKey, 0, encryptedContentEncryptionKey.length));
        }
        catch (InvalidCipherTextException e)
        {
            throw new CMSException("unable to unwrap key: " + e.getMessage(), e);
        }
    }

    public int getPasswordConversionScheme()
    {
        return schemeID;
    }

    public char[] getPassword()
    {
        return password;
    }
}