org.bouncycastle.cms.bc
Class BcKEKRecipient

java.lang.Object
  org.bouncycastle.cms.AbstractRecipient
      org.bouncycastle.cms.bc.BcKEKRecipient

All Implemented Interfaces:

KEKRecipient, Recipient

Direct Known Subclasses:

BcKEKEnvelopedRecipient

public abstract class BcKEKRecipient

extends AbstractRecipient

implements KEKRecipient

Constructor Summary

BcKEKRecipient(BcSymmetricKeyUnwrapper unwrapper)

Method Summary

protected org.bouncycastle.crypto.CipherParameters	extractSecretKey(org.bouncycastle.asn1.x509.AlgorithmIdentifier keyEncryptionAlgorithm, org.bouncycastle.asn1.x509.AlgorithmIdentifier contentEncryptionAlgorithm, byte[] encryptedContentEncryptionKey)
BcKEKRecipient	setAllowedContentAlgorithms(java.util.Set allowedContentAlgorithms) Set the content-encryption algorithms this recipient is willing to unwrap a key for.

Methods inherited from class org.bouncycastle.cms.AbstractRecipient

checkTagSize, isContentAlgorithmAllowed, setAllowedContentAlgorithmSet, setMinimumTagSizeInBits

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.bouncycastle.cms.KEKRecipient

getRecipientOperator

Constructor Detail

BcKEKRecipient

public BcKEKRecipient(BcSymmetricKeyUnwrapper unwrapper)

Method Detail

setAllowedContentAlgorithms

public BcKEKRecipient setAllowedContentAlgorithms(java.util.Set allowedContentAlgorithms)

Set the content-encryption algorithms this recipient is willing to unwrap a key for. When set, an attempt to recover content protected under any other algorithm is rejected, mitigating an attacker substituting a weaker content-encryption algorithm into the recipient info.

Parameters:

allowedContentAlgorithms - the set of permitted content-encryption algorithm OIDs.

Returns:

this recipient.

extractSecretKey

protected org.bouncycastle.crypto.CipherParameters extractSecretKey(org.bouncycastle.asn1.x509.AlgorithmIdentifier keyEncryptionAlgorithm,
                                                                    org.bouncycastle.asn1.x509.AlgorithmIdentifier contentEncryptionAlgorithm,
                                                                    byte[] encryptedContentEncryptionKey)
                                                             throws CMSException

Throws:

CMSException