File content as of revision 0:8918a71cdbe9:

/**
 * @file aria.c
 * @brief ARIA encryption algorithm
 *
 * @section License
 *
 * Copyright (C) 2010-2017 Oryx Embedded SARL. All rights reserved.
 *
 * This file is part of CycloneCrypto Open.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * @section Description
 *
 * ARIA is a 128-bit block cipher with 128-, 192-, and 256-bit keys. The
 * algorithm consists of a key scheduling part and data randomizing part.
 * Refer to RFC 5794 for more details
 *
 * @author Oryx Embedded SARL (www.oryx-embedded.com)
 * @version 1.7.6
 **/

//Switch to the appropriate trace level
#define TRACE_LEVEL CRYPTO_TRACE_LEVEL

//Dependencies
#include <string.h>
#include "crypto.h"
#include "aria.h"
#include "debug.h"

//Check crypto library configuration
#if (ARIA_SUPPORT == ENABLED)

//Move operation
#define MOV128(b, a) \
{ \
   (b)[0] = (a)[0]; \
   (b)[1] = (a)[1]; \
   (b)[2] = (a)[2]; \
   (b)[3] = (a)[3]; \
}

//XOR operation
#define XOR128(b, a) \
{ \
   (b)[0] ^= (a)[0]; \
   (b)[1] ^= (a)[1]; \
   (b)[2] ^= (a)[2]; \
   (b)[3] ^= (a)[3]; \
}

//Rotate left operation
#define ROL128(b, a, n) \
{ \
   (b)[0] = ((a)[((n) / 32 + 0) % 4] << ((n) % 32)) | ((a)[((n) / 32 + 1) % 4] >> (32 - ((n) % 32))); \
   (b)[1] = ((a)[((n) / 32 + 1) % 4] << ((n) % 32)) | ((a)[((n) / 32 + 2) % 4] >> (32 - ((n) % 32))); \
   (b)[2] = ((a)[((n) / 32 + 2) % 4] << ((n) % 32)) | ((a)[((n) / 32 + 3) % 4] >> (32 - ((n) % 32))); \
   (b)[3] = ((a)[((n) / 32 + 3) % 4] << ((n) % 32)) | ((a)[((n) / 32 + 0) % 4] >> (32 - ((n) % 32))); \
}

//Substitution layer SL1
#define SL1(b, a) \
{ \
   uint8_t *x = (uint8_t *) (a); \
   uint8_t *y = (uint8_t *) (b); \
   y[0] = sb1[x[0]]; \
   y[1] = sb2[x[1]]; \
   y[2] = sb3[x[2]]; \
   y[3] = sb4[x[3]]; \
   y[4] = sb1[x[4]]; \
   y[5] = sb2[x[5]]; \
   y[6] = sb3[x[6]]; \
   y[7] = sb4[x[7]]; \
   y[8] = sb1[x[8]]; \
   y[9] = sb2[x[9]]; \
   y[10] = sb3[x[10]]; \
   y[11] = sb4[x[11]]; \
   y[12] = sb1[x[12]]; \
   y[13] = sb2[x[13]]; \
   y[14] = sb3[x[14]]; \
   y[15] = sb4[x[15]]; \
}

//Substitution layer SL2
#define SL2(b, a) \
{ \
   uint8_t *x = (uint8_t *) (a); \
   uint8_t *y = (uint8_t *) (b); \
   y[0] = sb3[x[0]]; \
   y[1] = sb4[x[1]]; \
   y[2] = sb1[x[2]]; \
   y[3] = sb2[x[3]]; \
   y[4] = sb3[x[4]]; \
   y[5] = sb4[x[5]]; \
   y[6] = sb1[x[6]]; \
   y[7] = sb2[x[7]]; \
   y[8] = sb3[x[8]]; \
   y[9] = sb4[x[9]]; \
   y[10] = sb1[x[10]]; \
   y[11] = sb2[x[11]]; \
   y[12] = sb3[x[12]]; \
   y[13] = sb4[x[13]]; \
   y[14] = sb1[x[14]]; \
   y[15] = sb2[x[15]]; \
}

//Diffusion layer
#define A(b, a) \
{ \
   uint8_t *x = (uint8_t *) (a); \
   uint8_t *y = (uint8_t *) (b); \
   y[0] = x[3] ^ x[4] ^ x[6] ^ x[8] ^ x[9] ^ x[13] ^ x[14]; \
   y[1] = x[2] ^ x[5] ^ x[7] ^ x[8] ^ x[9] ^ x[12] ^ x[15]; \
   y[2] = x[1] ^ x[4] ^ x[6] ^ x[10] ^ x[11] ^ x[12] ^ x[15]; \
   y[3] = x[0] ^ x[5] ^ x[7] ^ x[10] ^ x[11] ^ x[13] ^ x[14]; \
   y[4] = x[0] ^ x[2] ^ x[5] ^ x[8] ^ x[11] ^ x[14] ^ x[15]; \
   y[5] = x[1] ^ x[3] ^ x[4] ^ x[9] ^ x[10] ^ x[14] ^ x[15]; \
   y[6] = x[0] ^ x[2] ^ x[7] ^ x[9] ^ x[10] ^ x[12] ^ x[13]; \
   y[7] = x[1] ^ x[3] ^ x[6] ^ x[8] ^ x[11] ^ x[12] ^ x[13]; \
   y[8] = x[0] ^ x[1] ^ x[4] ^ x[7] ^ x[10] ^ x[13] ^ x[15]; \
   y[9] = x[0] ^ x[1] ^ x[5] ^ x[6] ^ x[11] ^ x[12] ^ x[14]; \
   y[10] = x[2] ^ x[3] ^ x[5] ^ x[6] ^ x[8] ^ x[13] ^ x[15]; \
   y[11] = x[2] ^ x[3] ^ x[4] ^ x[7] ^ x[9] ^ x[12] ^ x[14]; \
   y[12] = x[1] ^ x[2] ^ x[6] ^ x[7] ^ x[9] ^ x[11] ^ x[12]; \
   y[13] = x[0] ^ x[3] ^ x[6] ^ x[7] ^ x[8] ^ x[10] ^ x[13]; \
   y[14] = x[0] ^ x[3] ^ x[4] ^ x[5] ^ x[9] ^ x[11] ^ x[14]; \
   y[15] = x[1] ^ x[2] ^ x[4] ^ x[5] ^ x[8] ^ x[10] ^ x[15]; \
}

//S-box 1
static const uint8_t sb1[256] =
{
   0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76,
   0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0,
   0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15,
   0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75,
   0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84,
   0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF,
   0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8,
   0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2,
   0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73,
   0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB,
   0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79,
   0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08,
   0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A,
   0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E,
   0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF,
   0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16
};

//S-box 2
static const uint8_t sb2[256] =
{
   0xE2, 0x4E, 0x54, 0xFC, 0x94, 0xC2, 0x4A, 0xCC, 0x62, 0x0D, 0x6A, 0x46, 0x3C, 0x4D, 0x8B, 0xD1,
   0x5E, 0xFA, 0x64, 0xCB, 0xB4, 0x97, 0xBE, 0x2B, 0xBC, 0x77, 0x2E, 0x03, 0xD3, 0x19, 0x59, 0xC1,
   0x1D, 0x06, 0x41, 0x6B, 0x55, 0xF0, 0x99, 0x69, 0xEA, 0x9C, 0x18, 0xAE, 0x63, 0xDF, 0xE7, 0xBB,
   0x00, 0x73, 0x66, 0xFB, 0x96, 0x4C, 0x85, 0xE4, 0x3A, 0x09, 0x45, 0xAA, 0x0F, 0xEE, 0x10, 0xEB,
   0x2D, 0x7F, 0xF4, 0x29, 0xAC, 0xCF, 0xAD, 0x91, 0x8D, 0x78, 0xC8, 0x95, 0xF9, 0x2F, 0xCE, 0xCD,
   0x08, 0x7A, 0x88, 0x38, 0x5C, 0x83, 0x2A, 0x28, 0x47, 0xDB, 0xB8, 0xC7, 0x93, 0xA4, 0x12, 0x53,
   0xFF, 0x87, 0x0E, 0x31, 0x36, 0x21, 0x58, 0x48, 0x01, 0x8E, 0x37, 0x74, 0x32, 0xCA, 0xE9, 0xB1,
   0xB7, 0xAB, 0x0C, 0xD7, 0xC4, 0x56, 0x42, 0x26, 0x07, 0x98, 0x60, 0xD9, 0xB6, 0xB9, 0x11, 0x40,
   0xEC, 0x20, 0x8C, 0xBD, 0xA0, 0xC9, 0x84, 0x04, 0x49, 0x23, 0xF1, 0x4F, 0x50, 0x1F, 0x13, 0xDC,
   0xD8, 0xC0, 0x9E, 0x57, 0xE3, 0xC3, 0x7B, 0x65, 0x3B, 0x02, 0x8F, 0x3E, 0xE8, 0x25, 0x92, 0xE5,
   0x15, 0xDD, 0xFD, 0x17, 0xA9, 0xBF, 0xD4, 0x9A, 0x7E, 0xC5, 0x39, 0x67, 0xFE, 0x76, 0x9D, 0x43,
   0xA7, 0xE1, 0xD0, 0xF5, 0x68, 0xF2, 0x1B, 0x34, 0x70, 0x05, 0xA3, 0x8A, 0xD5, 0x79, 0x86, 0xA8,
   0x30, 0xC6, 0x51, 0x4B, 0x1E, 0xA6, 0x27, 0xF6, 0x35, 0xD2, 0x6E, 0x24, 0x16, 0x82, 0x5F, 0xDA,
   0xE6, 0x75, 0xA2, 0xEF, 0x2C, 0xB2, 0x1C, 0x9F, 0x5D, 0x6F, 0x80, 0x0A, 0x72, 0x44, 0x9B, 0x6C,
   0x90, 0x0B, 0x5B, 0x33, 0x7D, 0x5A, 0x52, 0xF3, 0x61, 0xA1, 0xF7, 0xB0, 0xD6, 0x3F, 0x7C, 0x6D,
   0xED, 0x14, 0xE0, 0xA5, 0x3D, 0x22, 0xB3, 0xF8, 0x89, 0xDE, 0x71, 0x1A, 0xAF, 0xBA, 0xB5, 0x81
};

//S-box 3
static const uint8_t sb3[256] =
{
   0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 0xA3, 0x9E, 0x81, 0xF3, 0xD7, 0xFB,
   0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87, 0x34, 0x8E, 0x43, 0x44, 0xC4, 0xDE, 0xE9, 0xCB,
   0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D, 0xEE, 0x4C, 0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E,
   0x08, 0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2, 0x76, 0x5B, 0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25,
   0x72, 0xF8, 0xF6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xD4, 0xA4, 0x5C, 0xCC, 0x5D, 0x65, 0xB6, 0x92,
   0x6C, 0x70, 0x48, 0x50, 0xFD, 0xED, 0xB9, 0xDA, 0x5E, 0x15, 0x46, 0x57, 0xA7, 0x8D, 0x9D, 0x84,
   0x90, 0xD8, 0xAB, 0x00, 0x8C, 0xBC, 0xD3, 0x0A, 0xF7, 0xE4, 0x58, 0x05, 0xB8, 0xB3, 0x45, 0x06,
   0xD0, 0x2C, 0x1E, 0x8F, 0xCA, 0x3F, 0x0F, 0x02, 0xC1, 0xAF, 0xBD, 0x03, 0x01, 0x13, 0x8A, 0x6B,
   0x3A, 0x91, 0x11, 0x41, 0x4F, 0x67, 0xDC, 0xEA, 0x97, 0xF2, 0xCF, 0xCE, 0xF0, 0xB4, 0xE6, 0x73,
   0x96, 0xAC, 0x74, 0x22, 0xE7, 0xAD, 0x35, 0x85, 0xE2, 0xF9, 0x37, 0xE8, 0x1C, 0x75, 0xDF, 0x6E,
   0x47, 0xF1, 0x1A, 0x71, 0x1D, 0x29, 0xC5, 0x89, 0x6F, 0xB7, 0x62, 0x0E, 0xAA, 0x18, 0xBE, 0x1B,
   0xFC, 0x56, 0x3E, 0x4B, 0xC6, 0xD2, 0x79, 0x20, 0x9A, 0xDB, 0xC0, 0xFE, 0x78, 0xCD, 0x5A, 0xF4,
   0x1F, 0xDD, 0xA8, 0x33, 0x88, 0x07, 0xC7, 0x31, 0xB1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xEC, 0x5F,
   0x60, 0x51, 0x7F, 0xA9, 0x19, 0xB5, 0x4A, 0x0D, 0x2D, 0xE5, 0x7A, 0x9F, 0x93, 0xC9, 0x9C, 0xEF,
   0xA0, 0xE0, 0x3B, 0x4D, 0xAE, 0x2A, 0xF5, 0xB0, 0xC8, 0xEB, 0xBB, 0x3C, 0x83, 0x53, 0x99, 0x61,
   0x17, 0x2B, 0x04, 0x7E, 0xBA, 0x77, 0xD6, 0x26, 0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D
};

//S-box 4
static const uint8_t sb4[256] =
{
   0x30, 0x68, 0x99, 0x1B, 0x87, 0xB9, 0x21, 0x78, 0x50, 0x39, 0xDB, 0xE1, 0x72, 0x09, 0x62, 0x3C,
   0x3E, 0x7E, 0x5E, 0x8E, 0xF1, 0xA0, 0xCC, 0xA3, 0x2A, 0x1D, 0xFB, 0xB6, 0xD6, 0x20, 0xC4, 0x8D,
   0x81, 0x65, 0xF5, 0x89, 0xCB, 0x9D, 0x77, 0xC6, 0x57, 0x43, 0x56, 0x17, 0xD4, 0x40, 0x1A, 0x4D,
   0xC0, 0x63, 0x6C, 0xE3, 0xB7, 0xC8, 0x64, 0x6A, 0x53, 0xAA, 0x38, 0x98, 0x0C, 0xF4, 0x9B, 0xED,
   0x7F, 0x22, 0x76, 0xAF, 0xDD, 0x3A, 0x0B, 0x58, 0x67, 0x88, 0x06, 0xC3, 0x35, 0x0D, 0x01, 0x8B,
   0x8C, 0xC2, 0xE6, 0x5F, 0x02, 0x24, 0x75, 0x93, 0x66, 0x1E, 0xE5, 0xE2, 0x54, 0xD8, 0x10, 0xCE,
   0x7A, 0xE8, 0x08, 0x2C, 0x12, 0x97, 0x32, 0xAB, 0xB4, 0x27, 0x0A, 0x23, 0xDF, 0xEF, 0xCA, 0xD9,
   0xB8, 0xFA, 0xDC, 0x31, 0x6B, 0xD1, 0xAD, 0x19, 0x49, 0xBD, 0x51, 0x96, 0xEE, 0xE4, 0xA8, 0x41,
   0xDA, 0xFF, 0xCD, 0x55, 0x86, 0x36, 0xBE, 0x61, 0x52, 0xF8, 0xBB, 0x0E, 0x82, 0x48, 0x69, 0x9A,
   0xE0, 0x47, 0x9E, 0x5C, 0x04, 0x4B, 0x34, 0x15, 0x79, 0x26, 0xA7, 0xDE, 0x29, 0xAE, 0x92, 0xD7,
   0x84, 0xE9, 0xD2, 0xBA, 0x5D, 0xF3, 0xC5, 0xB0, 0xBF, 0xA4, 0x3B, 0x71, 0x44, 0x46, 0x2B, 0xFC,
   0xEB, 0x6F, 0xD5, 0xF6, 0x14, 0xFE, 0x7C, 0x70, 0x5A, 0x7D, 0xFD, 0x2F, 0x18, 0x83, 0x16, 0xA5,
   0x91, 0x1F, 0x05, 0x95, 0x74, 0xA9, 0xC1, 0x5B, 0x4A, 0x85, 0x6D, 0x13, 0x07, 0x4F, 0x4E, 0x45,
   0xB2, 0x0F, 0xC9, 0x1C, 0xA6, 0xBC, 0xEC, 0x73, 0x90, 0x7B, 0xCF, 0x59, 0x8F, 0xA1, 0xF9, 0x2D,
   0xF2, 0xB1, 0x00, 0x94, 0x37, 0x9F, 0xD0, 0x2E, 0x9C, 0x6E, 0x28, 0x3F, 0x80, 0xF0, 0x3D, 0xD3,
   0x25, 0x8A, 0xB5, 0xE7, 0x42, 0xB3, 0xC7, 0xEA, 0xF7, 0x4C, 0x11, 0x33, 0x03, 0xA2, 0xAC, 0x60
};

//Key scheduling constants
static const uint32_t c[12] =
{
   BETOH32(0x517CC1B7), BETOH32(0x27220A94), BETOH32(0xFE13ABE8), BETOH32(0xFA9A6EE0),
   BETOH32(0x6DB14ACC), BETOH32(0x9E21C820), BETOH32(0xFF28B1D5), BETOH32(0xEF5DE2B0),
   BETOH32(0xDB92371D), BETOH32(0x2126E970), BETOH32(0x03249775), BETOH32(0x04E8C90E)
};

//Common interface for encryption algorithms
const CipherAlgo ariaCipherAlgo =
{
   "ARIA",
   sizeof(AriaContext),
   CIPHER_ALGO_TYPE_BLOCK,
   ARIA_BLOCK_SIZE,
   (CipherAlgoInit) ariaInit,
   NULL,
   NULL,
   (CipherAlgoEncryptBlock) ariaEncryptBlock,
   (CipherAlgoDecryptBlock) ariaDecryptBlock
};


/**
 * @brief Odd round function
 * @param[in,out] d 128-bit string
 * @param[in] rk 128-bit string
 **/

static void OF(uint32_t *d, const uint32_t *rk)
{
   uint32_t t[4];

   //XOR D with RK
   XOR128(d, rk);
   //Substitution layer SL1
   SL1(t, d);
   //Diffusion layer
   A(d, t);
}


/**
 * @brief Even round function
 * @param[in,out] d 128-bit string
 * @param[in] rk 128-bit string
 **/

static void EF(uint32_t *d, const uint32_t *rk)
{
   uint32_t t[4];

   //XOR D with RK
   XOR128(d, rk);
   //Substitution layer SL2
   SL2(t, d);
   //Diffusion layer
   A(d, t);
}


/**
 * @brief Initialize a ARIA context using the supplied key
 * @param[in] context Pointer to the ARIA context to initialize
 * @param[in] key Pointer to the key
 * @param[in] keyLength Length of the key
 * @return Error code
 **/

error_t ariaInit(AriaContext *context, const uint8_t *key, size_t keyLength)
{
   uint_t i;
   uint32_t *ek;
   uint32_t *dk;
   const uint32_t *ck1;
   const uint32_t *ck2;
   const uint32_t *ck3;
   uint32_t w[16];

   //128-bit master key?
   if(keyLength == 16)
   {
      //Select the relevant constants
      ck1 = c + 0;
      ck2 = c + 4;
      ck3 = c + 8;
      //The number of rounds depends on the size of the master key
      context->nr = 12;
   }
   //192-bit master key?
   else if(keyLength == 24)
   {
      //Select the relevant constants
      ck1 = c + 4;
      ck2 = c + 8;
      ck3 = c + 0;
      //The number of rounds depends on the size of the master key
      context->nr = 14;
   }
   //256-bit master key?
   else if(keyLength == 32)
   {
      //Select the relevant constants
      ck1 = c + 8;
      ck2 = c + 0;
      ck3 = c + 4;
      //The number of rounds depends on the size of the master key
      context->nr = 16;
   }
   else
   {
      //Report an error
      return ERROR_INVALID_KEY_LENGTH;
   }

   //Compute 128-bit values KL and KR
   memset(w, 0, sizeof(w));
   memcpy(w, key, keyLength);

   //Save KR...
   MOV128(w + 8, w + 4);

   //Compute intermediate values W0, W1, W2, and W3
   MOV128(w + 4, w + 0);
   OF(w + 4, ck1);
   XOR128(w + 4, w + 8);

   MOV128(w + 8, w + 4);
   EF(w + 8, ck2);
   XOR128(w + 8, w + 0);

   MOV128(w + 12, w + 8);
   OF(w + 12, ck3);
   XOR128(w + 12, w + 4);

   //Convert from big-endian byte order to host byte order
   for(i = 0; i < 16; i++)
      w[i] = betoh32(w[i]);

   //Point to the encryption round keys
   ek = context->ek;

   //Compute ek1, ..., ek17 as follow
   ROL128(ek + 0, w + 4, 109);
   XOR128(ek + 0, w + 0);
   ROL128(ek + 4, w + 8, 109);
   XOR128(ek + 4, w + 4);
   ROL128(ek + 8, w + 12, 109);
   XOR128(ek + 8, w + 8);
   ROL128(ek + 12, w + 0, 109);
   XOR128(ek + 12, w + 12);
   ROL128(ek + 16, w + 4, 97);
   XOR128(ek + 16, w + 0);
   ROL128(ek + 20, w + 8, 97);
   XOR128(ek + 20, w + 4);
   ROL128(ek + 24, w + 12, 97);
   XOR128(ek + 24, w + 8);
   ROL128(ek + 28, w + 0, 97);
   XOR128(ek + 28, w + 12);
   ROL128(ek + 32, w + 4, 61);
   XOR128(ek + 32, w + 0);
   ROL128(ek + 36, w + 8, 61);
   XOR128(ek + 36, w + 4);
   ROL128(ek + 40, w + 12, 61);
   XOR128(ek + 40, w + 8);
   ROL128(ek + 44, w + 0, 61);
   XOR128(ek + 44, w + 12);
   ROL128(ek + 48, w + 4, 31);
   XOR128(ek + 48, w + 0);
   ROL128(ek + 52, w + 8, 31);
   XOR128(ek + 52, w + 4);
   ROL128(ek + 56, w + 12, 31);
   XOR128(ek + 56, w + 8);
   ROL128(ek + 60, w + 0, 31);
   XOR128(ek + 60, w + 12);
   ROL128(ek + 64, w + 4, 19);
   XOR128(ek + 64, w + 0);

   //Convert from host byte order to big-endian byte order
   for(i = 0; i < 68; i++)
      ek[i] = htobe32(ek[i]);

   //Decryption round keys are derived from the encryption round keys
   dk = context->dk;
   //Compute dk1
   MOV128(dk + 0, ek + context->nr * 4);

   //Compute dk2, ..., dk(n)
   for(i = 1; i < context->nr; i++)
      A(dk + i * 4, ek + (context->nr - i) * 4);

   //Compute dk(n + 1)
   MOV128(dk + i * 4, ek + 0);

   //No error to report
   return NO_ERROR;
}


/**
 * @brief Encrypt a 16-byte block using ARIA algorithm
 * @param[in] context Pointer to the ARIA context
 * @param[in] input Plaintext block to encrypt
 * @param[out] output Ciphertext block resulting from encryption
 **/

void ariaEncryptBlock(AriaContext *context, const uint8_t *input, uint8_t *output)
{
   uint32_t *ek;
   uint32_t p[4];
   uint32_t q[4];

   //Copy the plaintext to the buffer
   memcpy(p, input, ARIA_BLOCK_SIZE);

   //Point to the encryption round keys
   ek = context->ek;

   //Apply 11 rounds
   OF(p, ek + 0);
   EF(p, ek + 4);
   OF(p, ek + 8);
   EF(p, ek + 12);
   OF(p, ek + 16);
   EF(p, ek + 20);
   OF(p, ek + 24);
   EF(p, ek + 28);
   OF(p, ek + 32);
   EF(p, ek + 36);
   OF(p, ek + 40);

   //128-bit master keys require a total of 12 rounds
   if(context->nr == 12)
   {
      XOR128(p, ek + 44);
      SL2(q, p);
      XOR128(q, ek + 48);
   }
   //192-bit master keys require a total of 14 rounds
   else if(context->nr == 14)
   {
      EF(p, ek + 44);
      OF(p, ek + 48);
      XOR128(p, ek + 52);
      SL2(q, p);
      XOR128(q, ek + 56);
   }
   //256-bit master keys require a total of 16 rounds
   else
   {
      EF(p, ek + 44);
      OF(p, ek + 48);
      EF(p, ek + 52);
      OF(p, ek + 56);
      XOR128(p, ek + 60);
      SL2(q, p);
      XOR128(q, ek + 64);
   }

   //Copy the resulting ciphertext from the buffer
   memcpy(output, q, ARIA_BLOCK_SIZE);
}


/**
 * @brief Decrypt a 16-byte block using ARIA algorithm
 * @param[in] context Pointer to the ARIA context
 * @param[in] input Ciphertext block to decrypt
 * @param[out] output Plaintext block resulting from decryption
 **/

void ariaDecryptBlock(AriaContext *context, const uint8_t *input, uint8_t *output)
{
   uint32_t *dk;
   uint32_t p[4];
   uint32_t q[4];

   //Copy the ciphertext to the buffer
   memcpy(p, input, ARIA_BLOCK_SIZE);

   //Point to the decryption round keys
   dk = context->dk;

   //Apply 11 rounds
   OF(p, dk + 0);
   EF(p, dk + 4);
   OF(p, dk + 8);
   EF(p, dk + 12);
   OF(p, dk + 16);
   EF(p, dk + 20);
   OF(p, dk + 24);
   EF(p, dk + 28);
   OF(p, dk + 32);
   EF(p, dk + 36);
   OF(p, dk + 40);

   //128-bit master keys require a total of 12 rounds
   if(context->nr == 12)
   {
      XOR128(p, dk + 44);
      SL2(q, p);
      XOR128(q, dk + 48);
   }
   //192-bit master keys require a total of 14 rounds
   else if(context->nr == 14)
   {
      EF(p, dk + 44);
      OF(p, dk + 48);
      XOR128(p, dk + 52);
      SL2(q, p);
      XOR128(q, dk + 56);
   }
   //256-bit master keys require a total of 16 rounds
   else
   {
      EF(p, dk + 44);
      OF(p, dk + 48);
      EF(p, dk + 52);
      OF(p, dk + 56);
      XOR128(p, dk + 60);
      SL2(q, p);
      XOR128(q, dk + 64);
   }

   //The resulting value is the plaintext
   memcpy(output, q, ARIA_BLOCK_SIZE);
}

#endif