Line data    Source code

       1             : /*************************************************************************
       2             :  *
       3             :  *  Project
       4             :  *                         _____ _____  __  __ _____
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      10             :  *      | |
      11             :  *      |_|
      12             :  *
      13             :  * Copyright (C) Akiel Aries, <akiel@akiel.org>, et al.
      14             :  *
      15             :  * This software is licensed as described in the file LICENSE, which
      16             :  * you should have received as part of this distribution. The terms
      17             :  * among other details are referenced in the official documentation
      18             :  * seen here : https://akielaries.github.io/openGPMP/ along with
      19             :  * important files seen in this project.
      20             :  *
      21             :  * You may opt to use, copy, modify, merge, publish, distribute
      22             :  * and/or sell copies of the Software, and permit persons to whom
      23             :  * the Software is furnished to do so, under the terms of the
      24             :  * LICENSE file. As this is an Open Source effort, all implementations
      25             :  * must be of the same methodology.
      26             :  *
      27             :  *
      28             :  *
      29             :  * This software is distributed on an AS IS basis, WITHOUT
      30             :  * WARRANTY OF ANY KIND, either express or implied.
      31             :  *
      32             :  ************************************************************************/
      33             : 
      34             : /*
      35             :  * Implementation of the Red Pike block cipher algorithm
      36             :  */
      37             : #include <cstdint>
      38             : #include <openGPMP/nt/redpike.hpp>
      39             : 
      40           0 : uint32_t gpmp::nt::RedPike::rotl(uint32_t X, int R) {
      41           0 :     return ((X) << ((R)&31)) | ((X) >> (32 - ((R)&31)));
      42             : }
      43             : 
      44           0 : uint32_t gpmp::nt::RedPike::rotr(uint32_t X, int R) {
      45           0 :     return ((X) >> ((R)&31)) | ((X) << (32 - ((R)&31)));
      46             : }
      47             : 
      48           0 : void gpmp::nt::RedPike::encrypt(uint32_t *x, const uint32_t *k) {
      49           0 :     uint32_t rk0 = k[0];
      50           0 :     uint32_t rk1 = k[1];
      51             : 
      52           0 :     for (int i = 0; i < ROUNDS; i++) {
      53           0 :         rk0 += CONST;
      54           0 :         rk1 -= CONST;
      55             : 
      56           0 :         x[0] ^= rk0;
      57           0 :         x[0] += x[1];
      58           0 :         x[0] = rotl(x[0], x[1]);
      59             : 
      60           0 :         x[1] = rotr(x[1], x[0]);
      61           0 :         x[1] -= x[0];
      62           0 :         x[1] ^= rk1;
      63             :     }
      64             : 
      65           0 :     rk0 = x[0];
      66           0 :     x[0] = x[1];
      67           0 :     x[1] = rk0;
      68           0 : }
      69             : 
      70           0 : void gpmp::nt::RedPike::decrypt(uint32_t *x, const uint32_t *k) {
      71           0 :     uint32_t dk[2] = {k[1] - CONST * (ROUNDS + 1), k[0] + CONST * (ROUNDS + 1)};
      72             : 
      73           0 :     encrypt(x, dk);
      74           0 : }