public KeyTransRecipientInfo(
Asn1Sequence seq)
{
this.version = (DerInteger)seq[0];
this.rid = RecipientIdentifier.GetInstance(seq[1]);
this.keyEncryptionAlgorithm = AlgorithmIdentifier.GetInstance(seq[2]);
this.encryptedKey = (Asn1OctetString)seq[3];
}
public KeyTransRecipientInfo(
Asn1Sequence seq)
{
this.version = (DerInteger) seq[0];
this.rid = RecipientIdentifier.GetInstance(seq[1]);
this.keyEncryptionAlgorithm = AlgorithmIdentifier.GetInstance(seq[2]);
this.encryptedKey = (Asn1OctetString) seq[3];
}
public KeyTransRecipientInfo(
RecipientIdentifier rid,
AlgorithmIdentifier keyEncryptionAlgorithm,
Asn1OctetString encryptedKey)
{
if (rid.ToAsn1Object() is Asn1TaggedObject)
{
this.version = new DerInteger(2);
}
else
{
this.version = new DerInteger(0);
}
this.rid = rid;
this.keyEncryptionAlgorithm = keyEncryptionAlgorithm;
this.encryptedKey = encryptedKey;
}
public KeyTransRecipientInfo(
RecipientIdentifier rid,
AlgorithmIdentifier keyEncryptionAlgorithm,
Asn1OctetString encryptedKey)
{
if (rid.ToAsn1Object() is Asn1TaggedObject)
{
this.version = new DerInteger(2);
}
else
{
this.version = new DerInteger(0);
}
this.rid = rid;
this.keyEncryptionAlgorithm = keyEncryptionAlgorithm;
this.encryptedKey = encryptedKey;
}
public RecipientInfo Generate(KeyParameter contentEncryptionKey, SecureRandom random)
{
byte[] keyBytes = contentEncryptionKey.GetKey();
AlgorithmIdentifier keyEncryptionAlgorithm = info.AlgorithmID;
IWrapper keyWrapper = Helper.CreateWrapper(keyEncryptionAlgorithm.ObjectID.Id);
keyWrapper.Init(true, new ParametersWithRandom(recipientPublicKey, random));
byte[] encryptedKeyBytes = keyWrapper.Wrap(keyBytes, 0, keyBytes.Length);
RecipientIdentifier recipId;
if (recipientTbsCert != null)
{
IssuerAndSerialNumber issuerAndSerial = new IssuerAndSerialNumber(
recipientTbsCert.Issuer, recipientTbsCert.SerialNumber.Value);
recipId = new RecipientIdentifier(issuerAndSerial);
}
else
{
recipId = new RecipientIdentifier(subjectKeyIdentifier);
}
return new RecipientInfo(new KeyTransRecipientInfo(recipId, keyEncryptionAlgorithm,
new DerOctetString(encryptedKeyBytes)));
}