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using System;
using System.IO;
using Org.BouncyCastle.Crypto.Engines;
using Org.BouncyCastle.Crypto.Modes;
namespace Org.BouncyCastle.Crypto.Tls
{
public class DefaultTlsCipherFactory
: AbstractTlsCipherFactory
{
/// <exception cref="IOException"></exception>
public override TlsCipher CreateCipher(TlsContext context, int encryptionAlgorithm, int macAlgorithm)
{
switch (encryptionAlgorithm)
{
case EncryptionAlgorithm.cls_3DES_EDE_CBC:
return CreateDesEdeCipher(context, macAlgorithm);
case EncryptionAlgorithm.AEAD_CHACHA20_POLY1305:
// NOTE: Ignores macAlgorithm
return CreateChaCha20Poly1305(context);
case EncryptionAlgorithm.AES_128_CBC:
return CreateAESCipher(context, 16, macAlgorithm);
case EncryptionAlgorithm.AES_128_CCM:
// NOTE: Ignores macAlgorithm
return CreateCipher_Aes_Ccm(context, 16, 16);
case EncryptionAlgorithm.AES_128_CCM_8:
// NOTE: Ignores macAlgorithm
return CreateCipher_Aes_Ccm(context, 16, 8);
case EncryptionAlgorithm.AES_256_CCM:
// NOTE: Ignores macAlgorithm
return CreateCipher_Aes_Ccm(context, 32, 16);
case EncryptionAlgorithm.AES_256_CCM_8:
// NOTE: Ignores macAlgorithm
return CreateCipher_Aes_Ccm(context, 32, 8);
case EncryptionAlgorithm.AES_128_GCM:
// NOTE: Ignores macAlgorithm
return CreateCipher_Aes_Gcm(context, 16, 16);
case EncryptionAlgorithm.AES_256_CBC:
return CreateAESCipher(context, 32, macAlgorithm);
case EncryptionAlgorithm.AES_256_GCM:
// NOTE: Ignores macAlgorithm
return CreateCipher_Aes_Gcm(context, 32, 16);
case EncryptionAlgorithm.CAMELLIA_128_CBC:
return CreateCamelliaCipher(context, 16, macAlgorithm);
case EncryptionAlgorithm.CAMELLIA_128_GCM:
// NOTE: Ignores macAlgorithm
return CreateCipher_Camellia_Gcm(context, 16, 16);
case EncryptionAlgorithm.CAMELLIA_256_CBC:
return CreateCamelliaCipher(context, 32, macAlgorithm);
case EncryptionAlgorithm.CAMELLIA_256_GCM:
// NOTE: Ignores macAlgorithm
return CreateCipher_Camellia_Gcm(context, 32, 16);
case EncryptionAlgorithm.NULL:
return CreateNullCipher(context, macAlgorithm);
case EncryptionAlgorithm.RC4_128:
return CreateRC4Cipher(context, 16, macAlgorithm);
case EncryptionAlgorithm.SEED_CBC:
return CreateSeedCipher(context, macAlgorithm);
default:
throw new TlsFatalAlert(AlertDescription.internal_error);
}
}
/// <exception cref="IOException"></exception>
protected virtual TlsBlockCipher CreateAESCipher(TlsContext context, int cipherKeySize, int macAlgorithm)
{
return new TlsBlockCipher(context, CreateAesBlockCipher(), CreateAesBlockCipher(),
CreateHMacDigest(macAlgorithm), CreateHMacDigest(macAlgorithm), cipherKeySize);
}
/// <exception cref="IOException"></exception>
protected virtual TlsBlockCipher CreateCamelliaCipher(TlsContext context, int cipherKeySize, int macAlgorithm)
{
return new TlsBlockCipher(context, CreateCamelliaBlockCipher(),
CreateCamelliaBlockCipher(), CreateHMacDigest(macAlgorithm),
CreateHMacDigest(macAlgorithm), cipherKeySize);
}
/// <exception cref="IOException"></exception>
protected virtual TlsCipher CreateChaCha20Poly1305(TlsContext context)
{
return new Chacha20Poly1305(context);
}
/// <exception cref="IOException"></exception>
protected virtual TlsAeadCipher CreateCipher_Aes_Ccm(TlsContext context, int cipherKeySize, int macSize)
{
return new TlsAeadCipher(context, CreateAeadBlockCipher_Aes_Ccm(),
CreateAeadBlockCipher_Aes_Ccm(), cipherKeySize, macSize);
}
/// <exception cref="IOException"></exception>
protected virtual TlsAeadCipher CreateCipher_Aes_Gcm(TlsContext context, int cipherKeySize, int macSize)
{
return new TlsAeadCipher(context, CreateAeadBlockCipher_Aes_Gcm(),
CreateAeadBlockCipher_Aes_Gcm(), cipherKeySize, macSize);
}
/// <exception cref="IOException"></exception>
protected virtual TlsAeadCipher CreateCipher_Camellia_Gcm(TlsContext context, int cipherKeySize, int macSize)
{
return new TlsAeadCipher(context, CreateAeadBlockCipher_Camellia_Gcm(),
CreateAeadBlockCipher_Camellia_Gcm(), cipherKeySize, macSize);
}
/// <exception cref="IOException"></exception>
protected virtual TlsBlockCipher CreateDesEdeCipher(TlsContext context, int macAlgorithm)
{
return new TlsBlockCipher(context, CreateDesEdeBlockCipher(), CreateDesEdeBlockCipher(),
CreateHMacDigest(macAlgorithm), CreateHMacDigest(macAlgorithm), 24);
}
/// <exception cref="IOException"></exception>
protected virtual TlsNullCipher CreateNullCipher(TlsContext context, int macAlgorithm)
{
return new TlsNullCipher(context, CreateHMacDigest(macAlgorithm),
CreateHMacDigest(macAlgorithm));
}
/// <exception cref="IOException"></exception>
protected virtual TlsStreamCipher CreateRC4Cipher(TlsContext context, int cipherKeySize, int macAlgorithm)
{
return new TlsStreamCipher(context, CreateRC4StreamCipher(), CreateRC4StreamCipher(),
CreateHMacDigest(macAlgorithm), CreateHMacDigest(macAlgorithm), cipherKeySize, false);
}
/// <exception cref="IOException"></exception>
protected virtual TlsBlockCipher CreateSeedCipher(TlsContext context, int macAlgorithm)
{
return new TlsBlockCipher(context, CreateSeedBlockCipher(), CreateSeedBlockCipher(),
CreateHMacDigest(macAlgorithm), CreateHMacDigest(macAlgorithm), 16);
}
protected virtual IBlockCipher CreateAesEngine()
{
return new AesEngine();
}
protected virtual IBlockCipher CreateCamelliaEngine()
{
return new CamelliaEngine();
}
protected virtual IBlockCipher CreateAesBlockCipher()
{
return new CbcBlockCipher(CreateAesEngine());
}
protected virtual IAeadBlockCipher CreateAeadBlockCipher_Aes_Ccm()
{
return new CcmBlockCipher(CreateAesEngine());
}
protected virtual IAeadBlockCipher CreateAeadBlockCipher_Aes_Gcm()
{
// TODO Consider allowing custom configuration of multiplier
return new GcmBlockCipher(CreateAesEngine());
}
protected virtual IAeadBlockCipher CreateAeadBlockCipher_Camellia_Gcm()
{
// TODO Consider allowing custom configuration of multiplier
return new GcmBlockCipher(CreateCamelliaEngine());
}
protected virtual IBlockCipher CreateCamelliaBlockCipher()
{
return new CbcBlockCipher(CreateCamelliaEngine());
}
protected virtual IBlockCipher CreateDesEdeBlockCipher()
{
return new CbcBlockCipher(new DesEdeEngine());
}
protected virtual IStreamCipher CreateRC4StreamCipher()
{
return new RC4Engine();
}
protected virtual IBlockCipher CreateSeedBlockCipher()
{
return new CbcBlockCipher(new SeedEngine());
}
/// <exception cref="IOException"></exception>
protected virtual IDigest CreateHMacDigest(int macAlgorithm)
{
switch (macAlgorithm)
{
case MacAlgorithm.cls_null:
return null;
case MacAlgorithm.hmac_md5:
return TlsUtilities.CreateHash(HashAlgorithm.md5);
case MacAlgorithm.hmac_sha1:
return TlsUtilities.CreateHash(HashAlgorithm.sha1);
case MacAlgorithm.hmac_sha256:
return TlsUtilities.CreateHash(HashAlgorithm.sha256);
case MacAlgorithm.hmac_sha384:
return TlsUtilities.CreateHash(HashAlgorithm.sha384);
case MacAlgorithm.hmac_sha512:
return TlsUtilities.CreateHash(HashAlgorithm.sha512);
default:
throw new TlsFatalAlert(AlertDescription.internal_error);
}
}
}
}
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