/// <summary>
/// Initializes a new instance of the <see cref="SessionCrypter" /> class.
/// </summary>
/// <param name="keyDecrypter">The key decrypter.</param>
/// <param name="sessionMaterial">The session material.</param>
/// <param name="verifier">The verifier, optionally used to certify sender. (Equivialent to SignedSessionDecrypter)</param>
/// <param name="keyPacker">The key packer.</param>
public SessionCrypter(Crypter keyDecrypter, WebBase64 sessionMaterial, AttachedVerifier verifier = null,
ISessionKeyPacker keyPacker = null)
{
Workings initLazy()
{
var workings = new Workings();
if (verifier != null)
{
keyPacker = keyPacker ?? new NonceSignedSessionPacker();
}
keyPacker = keyPacker ?? new SimpleAesHmacSha1KeyPacker();
var sessionMaterialBytes = sessionMaterial.ToBytes();
var sessionPacker = keyPacker as IInteroperableSessionMaterialPacker;
workings._verifier = verifier;
if (sessionPacker == null && workings._verifier != null)
{
sessionMaterialBytes = workings._verifier.VerifiedMessage(sessionMaterialBytes);
}
var packedBytes = keyDecrypter.Decrypt(sessionMaterialBytes);
Key key;
if (sessionPacker == null)
{
key = keyPacker.Unpack(packedBytes, Config);
}
else
{
var nonceSession = sessionPacker.UnpackMaterial(packedBytes, Config);
key = nonceSession.Key;
workings._nonce = nonceSession.Nonce.ToBytes();
}
workings._keyset = new ImportedKeySet(key, KeyPurpose.DecryptAndEncrypt);
workings._crypter = new Crypter(workings._keyset);
workings._sessionMaterial = sessionMaterial;
return(workings);
}
_working = new Lazy <Workings>(initLazy);
}
/// <summary>
/// Initializes a new instance of the <see cref="SessionCrypter" /> class.
/// </summary>
/// <param name="keyDecrypter">The key decrypter.</param>
/// <param name="sessionMaterial">The session material.</param>
/// <param name="verifier">The verifier, optionally used to certify sender. (Equivialent to SignedSessionDecrypter)</param>
/// <param name="keyPacker">The key packer.</param>
public SessionCrypter(Crypter keyDecrypter, WebBase64 sessionMaterial, AttachedVerifier verifier = null,
ISessionKeyPacker keyPacker = null)
{
if (verifier != null)
{
keyPacker = keyPacker ?? new NonceSignedSessionPacker();
}
keyPacker = keyPacker ?? new SimpleAesHmacSha1KeyPacker();
var sessionMaterialBytes = sessionMaterial.ToBytes();
var sessionPacker = keyPacker as IInteroperableSessionMaterialPacker;
_verifier = verifier;
if (sessionPacker == null && _verifier != null)
{
sessionMaterialBytes = _verifier.VerifiedMessage(sessionMaterialBytes);
}
var packedBytes = keyDecrypter.Decrypt(sessionMaterialBytes);
Key key;
if (sessionPacker == null)
{
key = keyPacker.Unpack(packedBytes);
}
else
{
var nonceSession = sessionPacker.UnpackMaterial(packedBytes);
key = nonceSession.Key;
_nonce = nonceSession.Nonce.ToBytes();
}
_keyset = new ImportedKeySet(key, KeyPurpose.DecryptAndEncrypt);
_crypter = new Crypter(_keyset);
_sessionMaterial = sessionMaterial;
}