Package org.bouncycastle.cms.bc

Class BcKeyTransRecipient

java.lang.Object

org.bouncycastle.cms.AbstractRecipient

org.bouncycastle.cms.bc.BcKeyTransRecipient

All Implemented Interfaces:

KeyTransRecipient, Recipient

Direct Known Subclasses:

BcRSAKeyTransEnvelopedRecipient

public abstract class BcKeyTransRecipient
extends AbstractRecipient
implements KeyTransRecipient

Constructor Summary

Constructors

Constructor	Description
BcKeyTransRecipient(org.bouncycastle.crypto.params.AsymmetricKeyParameter recipientKey)

Method Summary

Modifier and Type	Method	Description
protected org.bouncycastle.crypto.CipherParameters	extractSecretKey(org.bouncycastle.asn1.x509.AlgorithmIdentifier keyEncryptionAlgorithm, org.bouncycastle.asn1.x509.AlgorithmIdentifier encryptedKeyAlgorithm, byte[] encryptedEncryptionKey)
BcKeyTransRecipient	setAllowedContentAlgorithms(java.util.Set<org.bouncycastle.asn1.ASN1ObjectIdentifier> 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.KeyTransRecipient

getRecipientOperator

Constructor Detail

BcKeyTransRecipient

public BcKeyTransRecipient(org.bouncycastle.crypto.params.AsymmetricKeyParameter recipientKey)

Method Detail

setAllowedContentAlgorithms

public BcKeyTransRecipient setAllowedContentAlgorithms(java.util.Set<org.bouncycastle.asn1.ASN1ObjectIdentifier> 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 encryptedKeyAlgorithm,
                                                                    byte[] encryptedEncryptionKey)
                                                             throws CMSException

Throws:

CMSException