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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/**
* Interfaces for implementing secret key algorithms.
*
* Copyright: Eugene Wissner 2016.
* License: $(LINK2 https://www.mozilla.org/en-US/MPL/2.0/,
* Mozilla Public License, v. 2.0).
* Authors: $(LINK2 mailto:belka@caraus.de, Eugene Wissner)
*/
module tanya.crypto.symmetric;
/**
* Implemented by secret key algorithms.
*/
interface SymmetricCipher
{
/**
* Returns: Key length.
*/
@property inout(uint) keyLength() inout const pure nothrow @safe @nogc;
/**
* Returns: Minimum key length.
*/
@property inout(uint) minKeyLength() inout const pure nothrow @safe @nogc;
/**
* Returns: Maximum key length.
*/
@property inout(uint) maxKeyLength() inout const pure nothrow @safe @nogc;
/// Cipher direction.
protected enum Direction : ushort
{
encryption,
decryption,
}
/**
* Params:
* key = Key.
*/
@property void key(ubyte[] key) pure nothrow @safe @nogc
in
{
assert(key.length >= minKeyLength);
assert(key.length <= maxKeyLength);
}
}
/**
* Implemented by block ciphers.
*/
interface BlockCipher : SymmetricCipher
{
/**
* Returns: Block size.
*/
@property inout(uint) blockSize() inout const pure nothrow @safe @nogc;
/**
* Encrypts a block.
*
* Params:
* plain = Plain text, input.
* cipher = Cipher text, output.
*/
void encrypt(in ubyte[] plain, ubyte[] cipher)
in
{
assert(plain.length == blockSize);
assert(cipher.length == blockSize);
}
/**
* Decrypts a block.
*
* Params:
* cipher = Cipher text, input.
* plain = Plain text, output.
*/
void decrypt(in ubyte[] cipher, ubyte[] plain)
in
{
assert(plain.length == blockSize);
assert(cipher.length == blockSize);
}
}
/**
* Mixed in by algorithms with fixed block size.
*
* Params:
* N = Block size.
*/
mixin template FixedBlockSize(uint N)
if (N != 0)
{
private enum uint blockSize_ = N;
/**
* Returns: Fixed block size.
*/
final @property inout(uint) blockSize() inout const pure nothrow @safe @nogc
{
return blockSize_;
}
}
/**
* Mixed in by symmetric algorithms.
* If $(D_PARAM Min) equals $(D_PARAM Max) fixed key length is assumed.
*
* Params:
* Min = Minimum key length.
* Max = Maximum key length.
*/
mixin template KeyLength(uint Min, uint Max = Min)
if (Min != 0 && Max != 0)
{
static if (Min == Max)
{
private enum uint keyLength_ = Min;
/**
* Returns: Key length.
*/
final @property inout(uint) keyLength() inout const pure nothrow @safe @nogc
{
return keyLength_;
}
/**
* Returns: Minimum key length.
*/
final @property inout(uint) minKeyLength() inout const pure nothrow @safe @nogc
{
return keyLength_;
}
/**
* Returns: Maximum key length.
*/
final @property inout(uint) maxKeyLength() inout const pure nothrow @safe @nogc
{
return keyLength_;
}
}
else static if (Min < Max)
{
private enum uint minKeyLength_ = Min;
private enum uint maxKeyLength_ = Max;
/**
* Returns: Minimum key length.
*/
final @property inout(uint) minKeyLength() inout const pure nothrow @safe @nogc
{
return minKeyLength_;
}
/**
* Returns: Maximum key length.
*/
final @property inout(uint) maxKeyLength() inout const pure nothrow @safe @nogc
{
return maxKeyLength_;
}
}
else
{
static assert(false, "Max should be larger or equal to Min");
}
}
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