/// <summary>
/// Initializes a new instance of the <see cref="SessionCrypter" /> class.
/// </summary>
/// <param name="keyEncrypter">The key encrypter.</param>
/// <param name="signer">The signer, optionally used to certify sender. (Equivialent to SignedSessionEncrypter)</param>
/// <param name="keySize">Size of the key.</param>
/// <param name="symmetricKeyType">Type of the symmetric key. (requires unofficial keypacker)</param>
/// <param name="keyPacker">The key packer.</param>
/// <exception cref="System.ArgumentException">Without a supplying a keypacker you may only use KeyType.AES;symmetricKeyType</exception>
public SessionCrypter(Encrypter keyEncrypter, AttachedSigner signer = null, int?keySize = null,
KeyType symmetricKeyType = null, ISessionKeyPacker keyPacker = null)
{
Workings initLazy()
{
var workings = new Workings();
symmetricKeyType = symmetricKeyType ?? KeyType.Aes;
if (keyPacker == null && symmetricKeyType != KeyType.Aes)
{
throw new ArgumentException("Without a supplying a keypacker you may only use KeyType.AES",
nameof(symmetricKeyType));
}
if (signer != null)
{
keyPacker = keyPacker ?? new NonceSignedSessionPacker();
}
keyPacker = keyPacker ?? new SimpleAesHmacSha1KeyPacker();
var key = Key.Generate(symmetricKeyType, keySize ?? symmetricKeyType.DefaultSize);
workings._keyset = new ImportedKeySet(key, KeyPurpose.DecryptAndEncrypt);
workings._crypter = new Crypter(workings._keyset);
workings._signer = signer;
byte[] packedKey;
var sessionPacker = keyPacker as IInteroperableSessionMaterialPacker;
if (sessionPacker == null)
{
packedKey = keyPacker.Pack(key, Config);
}
else
{
var nonceSession = new NonceSessionMaterial((AesKey)key);
packedKey = sessionPacker.PackMaterial(nonceSession, Config);
workings._nonce = nonceSession.Nonce.ToBytes();
}
workings._sessionMaterial = WebBase64.FromBytes(keyEncrypter.Encrypt(packedKey));
if (sessionPacker == null && workings._signer != null)
{
workings._sessionMaterial = WebBase64.FromBytes(workings._signer.Sign(workings._sessionMaterial.ToBytes()));
}
return(workings);
}
_working = new Lazy <Workings>(initLazy);
}
/// <summary>
/// Initializes a new instance of the <see cref="SessionCrypter" /> class.
/// </summary>
/// <param name="keyEncrypter">The key encrypter.</param>
/// <param name="signer">The signer, optionally used to certify sender. (Equivialent to SignedSessionEncrypter)</param>
/// <param name="keySize">Size of the key.</param>
/// <param name="symmetricKeyType">Type of the symmetric key. (requires unofficial keypacker)</param>
/// <param name="keyPacker">The key packer.</param>
/// <exception cref="System.ArgumentException">Without a supplying a keypacker you may only use KeyType.AES;symmetricKeyType</exception>
public SessionCrypter(Encrypter keyEncrypter, AttachedSigner signer = null, int?keySize = null,
KeyType symmetricKeyType = null, ISessionKeyPacker keyPacker = null)
{
symmetricKeyType = symmetricKeyType ?? KeyType.Aes;
if (keyPacker == null && symmetricKeyType != KeyType.Aes)
{
throw new ArgumentException("Without a supplying a keypacker you may only use KeyType.AES",
"symmetricKeyType");
}
if (signer != null)
{
keyPacker = keyPacker ?? new NonceSignedSessionPacker();
}
keyPacker = keyPacker ?? new SimpleAesHmacSha1KeyPacker();
var key = Key.Generate(symmetricKeyType, keySize ?? symmetricKeyType.DefaultSize);
_keyset = new ImportedKeySet(key, KeyPurpose.DecryptAndEncrypt);
_crypter = new Crypter(_keyset);
_signer = signer;
byte[] packedKey;
var sessionPacker = keyPacker as IInteroperableSessionMaterialPacker;
if (sessionPacker == null)
{
packedKey = keyPacker.Pack(key);
}
else
{
var nonceSession = new NonceSessionMaterial((AesKey)key);
packedKey = sessionPacker.PackMaterial(nonceSession);
_nonce = nonceSession.Nonce.ToBytes();
}
_sessionMaterial = WebBase64.FromBytes(keyEncrypter.Encrypt(packedKey));
if (sessionPacker == null && _signer != null)
{
_sessionMaterial = WebBase64.FromBytes(_signer.Sign(_sessionMaterial.ToBytes()));
}
}
/// <summary>
/// Packs the material.
/// </summary>
/// <param name="material">The material.</param>
/// <returns></returns>
public byte[] PackMaterial(NonceSessionMaterial material)
{
string json = material.ToJson();
return(Keyczar.RawStringEncoding.GetBytes(json));
}
