KeyTransRecipientInfoGenerator
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.Cms;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.X509;
namespace Org.BouncyCastle.Cms
{
public class KeyTransRecipientInfoGenerator : RecipientInfoGenerator
{
private readonly IKeyWrapper m_keyWrapper;
private IssuerAndSerialNumber m_issuerAndSerialNumber;
private Asn1OctetString m_subjectKeyIdentifier;
protected virtual AlgorithmIdentifier AlgorithmDetails => (AlgorithmIdentifier)m_keyWrapper.AlgorithmDetails;
public KeyTransRecipientInfoGenerator(X509Certificate recipCert, IKeyWrapper keyWrapper)
: this(new IssuerAndSerialNumber(recipCert.CertificateStructure), keyWrapper)
{
}
public KeyTransRecipientInfoGenerator(IssuerAndSerialNumber issuerAndSerial, IKeyWrapper keyWrapper)
{
m_issuerAndSerialNumber = issuerAndSerial;
m_keyWrapper = keyWrapper;
}
public KeyTransRecipientInfoGenerator(byte[] subjectKeyID, IKeyWrapper keyWrapper)
{
m_subjectKeyIdentifier = new DerOctetString(subjectKeyID);
m_keyWrapper = keyWrapper;
}
public RecipientInfo Generate(KeyParameter contentEncryptionKey, SecureRandom random)
{
AlgorithmIdentifier algorithmDetails = AlgorithmDetails;
byte[] contents = GenerateWrappedKey(contentEncryptionKey);
RecipientIdentifier rid = (m_issuerAndSerialNumber == null) ? new RecipientIdentifier(m_subjectKeyIdentifier) : new RecipientIdentifier(m_issuerAndSerialNumber);
return new RecipientInfo(new KeyTransRecipientInfo(rid, algorithmDetails, new DerOctetString(contents)));
}
protected virtual byte[] GenerateWrappedKey(KeyParameter contentEncryptionKey)
{
return m_keyWrapper.Wrap(contentEncryptionKey.GetKey()).Collect();
}
}
}