import org.bouncycastle.asn1.cms.RecipientKeyIdentifier; //导入依赖的package包/类
public SMIMEEncryptionKeyPreferenceAttribute(
    RecipientKeyIdentifier rKeyId)
{

    super(SMIMEAttributes.encrypKeyPref, 
                new DERSet(new DERTaggedObject(false, 1, rKeyId)));
}
 

import org.bouncycastle.asn1.cms.RecipientKeyIdentifier; //导入依赖的package包/类
static void readRecipientInfo(List infos, KeyAgreeRecipientInfo info,
    AlgorithmIdentifier messageAlgorithm, CMSSecureReadable secureReadable, AuthAttributesProvider additionalData)
{
    ASN1Sequence s = info.getRecipientEncryptedKeys();

    for (int i = 0; i < s.size(); ++i)
    {
        RecipientEncryptedKey id = RecipientEncryptedKey.getInstance(
            s.getObjectAt(i));

        RecipientId rid;

        KeyAgreeRecipientIdentifier karid = id.getIdentifier();
        IssuerAndSerialNumber iAndSN = karid.getIssuerAndSerialNumber();

        if (iAndSN != null)
        {
            rid = new KeyAgreeRecipientId(iAndSN.getName(), iAndSN.getSerialNumber().getValue());
        }
        else
        {
            RecipientKeyIdentifier rKeyID = karid.getRKeyID();

            // Note: 'date' and 'other' fields of RecipientKeyIdentifier appear to be only informational

            rid = new KeyAgreeRecipientId(rKeyID.getSubjectKeyIdentifier().getOctets());
        }

        infos.add(new KeyAgreeRecipientInformation(info, rid, id.getEncryptedKey(), messageAlgorithm,
            secureReadable, additionalData));
    }
}
 

import org.bouncycastle.asn1.cms.RecipientKeyIdentifier; //导入依赖的package包/类
/**
 * Add a recipient identified by the passed in subjectKeyID and the for the passed in public key.
 *
 * @param subjectKeyID identifier actual recipient will use to match the private key.
 * @param publicKey the public key for encrypting the secret key.
 * @return the current instance.
 * @throws CertificateEncodingException
 */
public JceKeyAgreeRecipientInfoGenerator addRecipient(byte[] subjectKeyID, PublicKey publicKey)
    throws CertificateEncodingException
{
    recipientIDs.add(new KeyAgreeRecipientIdentifier(new RecipientKeyIdentifier(subjectKeyID)));
    recipientKeys.add(publicKey);

    return this;
}
 

import org.bouncycastle.asn1.cms.RecipientKeyIdentifier; //导入依赖的package包/类
public TestResult perform()
{
    SMIMECapabilityVector       caps = new SMIMECapabilityVector();
            
    caps.addCapability(SMIMECapability.dES_EDE3_CBC);
    caps.addCapability(SMIMECapability.rC2_CBC, 128);
    caps.addCapability(SMIMECapability.dES_CBC);
            
    SMIMECapabilitiesAttribute attr = new SMIMECapabilitiesAttribute(caps);
    
    SMIMEEncryptionKeyPreferenceAttribute   pref = new SMIMEEncryptionKeyPreferenceAttribute(
                                              new RecipientKeyIdentifier(new DEROctetString(new byte[8]), new DERGeneralizedTime("20070315173729Z"), null));
    
    try
    {
        if (!isSameAs(attr.getEncoded(), attrBytes))
        {
            return new SimpleTestResult(false, getName() + ": Failed attr data check");
        }
        
        ByteArrayInputStream    bIn = new ByteArrayInputStream(attrBytes);
        ASN1InputStream         aIn = new ASN1InputStream(bIn);
        
        ASN1Primitive o = aIn.readObject();
        if (!attr.equals(o))
        {
            return new SimpleTestResult(false, getName() + ": Failed equality test for attr");
        }
        
        if (!isSameAs(pref.getEncoded(), prefBytes))
        {
            return new SimpleTestResult(false, getName() + ": Failed attr data check");
        }
        
        bIn = new ByteArrayInputStream(prefBytes);
        aIn = new ASN1InputStream(bIn);
        
        o = aIn.readObject();
        if (!pref.equals(o))
        {
            return new SimpleTestResult(false, getName() + ": Failed equality test for pref");
        }
        
        return new SimpleTestResult(true, getName() + ": Okay");
    }
    catch (Exception e)
    {
        return new SimpleTestResult(false, getName() + ": Failed - exception " + e.toString(), e);
    }
}