Diff: cyclone_crypto/seed.c

Revision:

0:8918a71cdbe9

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cyclone_crypto/seed.c	Sat Feb 04 18:15:49 2017 +0000
@@ -0,0 +1,384 @@
+/**
+ * @file seed.c
+ * @brief SEED 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
+ *
+ * SEED is a 128-bit symmetric key block cipher. Refer to RFC 4269
+ *
+ * @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 "seed.h"
+#include "debug.h"
+
+//Check crypto library configuration
+#if (SEED_SUPPORT == ENABLED)
+
+//Function G
+#define G(x) (ss0[(x) & 0xFF] ^ ss1[((x) >> 8) & 0xFF] ^ ss2[((x) >> 16) & 0xFF] ^ ss3[((x) >> 24) & 0xFF])
+
+//Round function F
+#define F(k0, k1, r0, r1, t0, t1) \
+{ \
+   t1 = (r0 ^ k0) ^ (r1 ^ k1); \
+   t1 = G(t1); \
+   t0 = t1 + (r0 ^ k0); \
+   t0 = G(t0); \
+   t1 += t0; \
+   t1 = G(t1); \
+   t0 += t1; \
+}
+
+//Key schedule constants
+static const uint32_t kc[16] =
+{
+   0x9E3779B9, 0x3C6EF373, 0x78DDE6E6, 0xF1BBCDCC,
+   0xE3779B99, 0xC6EF3733, 0x8DDE6E67, 0x1BBCDCCF,
+   0x3779B99E, 0x6EF3733C, 0xDDE6E678, 0xBBCDCCF1,
+   0x779B99E3, 0xEF3733C6, 0xDE6E678D, 0xBCDCCF1B
+};
+
+//S-Box SS0
+static const uint32_t ss0[256] =
+{
+   0x2989A1A8, 0x05858184, 0x16C6D2D4, 0x13C3D3D0, 0x14445054, 0x1D0D111C, 0x2C8CA0AC, 0x25052124,
+   0x1D4D515C, 0x03434340, 0x18081018, 0x1E0E121C, 0x11415150, 0x3CCCF0FC, 0x0ACAC2C8, 0x23436360,
+   0x28082028, 0x04444044, 0x20002020, 0x1D8D919C, 0x20C0E0E0, 0x22C2E2E0, 0x08C8C0C8, 0x17071314,
+   0x2585A1A4, 0x0F8F838C, 0x03030300, 0x3B4B7378, 0x3B8BB3B8, 0x13031310, 0x12C2D2D0, 0x2ECEE2EC,
+   0x30407070, 0x0C8C808C, 0x3F0F333C, 0x2888A0A8, 0x32023230, 0x1DCDD1DC, 0x36C6F2F4, 0x34447074,
+   0x2CCCE0EC, 0x15859194, 0x0B0B0308, 0x17475354, 0x1C4C505C, 0x1B4B5358, 0x3D8DB1BC, 0x01010100,
+   0x24042024, 0x1C0C101C, 0x33437370, 0x18889098, 0x10001010, 0x0CCCC0CC, 0x32C2F2F0, 0x19C9D1D8,
+   0x2C0C202C, 0x27C7E3E4, 0x32427270, 0x03838380, 0x1B8B9398, 0x11C1D1D0, 0x06868284, 0x09C9C1C8,
+   0x20406060, 0x10405050, 0x2383A3A0, 0x2BCBE3E8, 0x0D0D010C, 0x3686B2B4, 0x1E8E929C, 0x0F4F434C,
+   0x3787B3B4, 0x1A4A5258, 0x06C6C2C4, 0x38487078, 0x2686A2A4, 0x12021210, 0x2F8FA3AC, 0x15C5D1D4,
+   0x21416160, 0x03C3C3C0, 0x3484B0B4, 0x01414140, 0x12425250, 0x3D4D717C, 0x0D8D818C, 0x08080008,
+   0x1F0F131C, 0x19899198, 0x00000000, 0x19091118, 0x04040004, 0x13435350, 0x37C7F3F4, 0x21C1E1E0,
+   0x3DCDF1FC, 0x36467274, 0x2F0F232C, 0x27072324, 0x3080B0B0, 0x0B8B8388, 0x0E0E020C, 0x2B8BA3A8,
+   0x2282A2A0, 0x2E4E626C, 0x13839390, 0x0D4D414C, 0x29496168, 0x3C4C707C, 0x09090108, 0x0A0A0208,
+   0x3F8FB3BC, 0x2FCFE3EC, 0x33C3F3F0, 0x05C5C1C4, 0x07878384, 0x14041014, 0x3ECEF2FC, 0x24446064,
+   0x1ECED2DC, 0x2E0E222C, 0x0B4B4348, 0x1A0A1218, 0x06060204, 0x21012120, 0x2B4B6368, 0x26466264,
+   0x02020200, 0x35C5F1F4, 0x12829290, 0x0A8A8288, 0x0C0C000C, 0x3383B3B0, 0x3E4E727C, 0x10C0D0D0,
+   0x3A4A7278, 0x07474344, 0x16869294, 0x25C5E1E4, 0x26062224, 0x00808080, 0x2D8DA1AC, 0x1FCFD3DC,
+   0x2181A1A0, 0x30003030, 0x37073334, 0x2E8EA2AC, 0x36063234, 0x15051114, 0x22022220, 0x38083038,
+   0x34C4F0F4, 0x2787A3A4, 0x05454144, 0x0C4C404C, 0x01818180, 0x29C9E1E8, 0x04848084, 0x17879394,
+   0x35053134, 0x0BCBC3C8, 0x0ECEC2CC, 0x3C0C303C, 0x31417170, 0x11011110, 0x07C7C3C4, 0x09898188,
+   0x35457174, 0x3BCBF3F8, 0x1ACAD2D8, 0x38C8F0F8, 0x14849094, 0x19495158, 0x02828280, 0x04C4C0C4,
+   0x3FCFF3FC, 0x09494148, 0x39093138, 0x27476364, 0x00C0C0C0, 0x0FCFC3CC, 0x17C7D3D4, 0x3888B0B8,
+   0x0F0F030C, 0x0E8E828C, 0x02424240, 0x23032320, 0x11819190, 0x2C4C606C, 0x1BCBD3D8, 0x2484A0A4,
+   0x34043034, 0x31C1F1F0, 0x08484048, 0x02C2C2C0, 0x2F4F636C, 0x3D0D313C, 0x2D0D212C, 0x00404040,
+   0x3E8EB2BC, 0x3E0E323C, 0x3C8CB0BC, 0x01C1C1C0, 0x2A8AA2A8, 0x3A8AB2B8, 0x0E4E424C, 0x15455154,
+   0x3B0B3338, 0x1CCCD0DC, 0x28486068, 0x3F4F737C, 0x1C8C909C, 0x18C8D0D8, 0x0A4A4248, 0x16465254,
+   0x37477374, 0x2080A0A0, 0x2DCDE1EC, 0x06464244, 0x3585B1B4, 0x2B0B2328, 0x25456164, 0x3ACAF2F8,
+   0x23C3E3E0, 0x3989B1B8, 0x3181B1B0, 0x1F8F939C, 0x1E4E525C, 0x39C9F1F8, 0x26C6E2E4, 0x3282B2B0,
+   0x31013130, 0x2ACAE2E8, 0x2D4D616C, 0x1F4F535C, 0x24C4E0E4, 0x30C0F0F0, 0x0DCDC1CC, 0x08888088,
+   0x16061214, 0x3A0A3238, 0x18485058, 0x14C4D0D4, 0x22426260, 0x29092128, 0x07070304, 0x33033330,
+   0x28C8E0E8, 0x1B0B1318, 0x05050104, 0x39497178, 0x10809090, 0x2A4A6268, 0x2A0A2228, 0x1A8A9298
+};
+
+//S-Box SS1
+static const uint32_t ss1[256] =
+{
+   0x38380830, 0xE828C8E0, 0x2C2D0D21, 0xA42686A2, 0xCC0FCFC3, 0xDC1ECED2, 0xB03383B3, 0xB83888B0,
+   0xAC2F8FA3, 0x60204060, 0x54154551, 0xC407C7C3, 0x44044440, 0x6C2F4F63, 0x682B4B63, 0x581B4B53,
+   0xC003C3C3, 0x60224262, 0x30330333, 0xB43585B1, 0x28290921, 0xA02080A0, 0xE022C2E2, 0xA42787A3,
+   0xD013C3D3, 0x90118191, 0x10110111, 0x04060602, 0x1C1C0C10, 0xBC3C8CB0, 0x34360632, 0x480B4B43,
+   0xEC2FCFE3, 0x88088880, 0x6C2C4C60, 0xA82888A0, 0x14170713, 0xC404C4C0, 0x14160612, 0xF434C4F0,
+   0xC002C2C2, 0x44054541, 0xE021C1E1, 0xD416C6D2, 0x3C3F0F33, 0x3C3D0D31, 0x8C0E8E82, 0x98188890,
+   0x28280820, 0x4C0E4E42, 0xF436C6F2, 0x3C3E0E32, 0xA42585A1, 0xF839C9F1, 0x0C0D0D01, 0xDC1FCFD3,
+   0xD818C8D0, 0x282B0B23, 0x64264662, 0x783A4A72, 0x24270723, 0x2C2F0F23, 0xF031C1F1, 0x70324272,
+   0x40024242, 0xD414C4D0, 0x40014141, 0xC000C0C0, 0x70334373, 0x64274763, 0xAC2C8CA0, 0x880B8B83,
+   0xF437C7F3, 0xAC2D8DA1, 0x80008080, 0x1C1F0F13, 0xC80ACAC2, 0x2C2C0C20, 0xA82A8AA2, 0x34340430,
+   0xD012C2D2, 0x080B0B03, 0xEC2ECEE2, 0xE829C9E1, 0x5C1D4D51, 0x94148490, 0x18180810, 0xF838C8F0,
+   0x54174753, 0xAC2E8EA2, 0x08080800, 0xC405C5C1, 0x10130313, 0xCC0DCDC1, 0x84068682, 0xB83989B1,
+   0xFC3FCFF3, 0x7C3D4D71, 0xC001C1C1, 0x30310131, 0xF435C5F1, 0x880A8A82, 0x682A4A62, 0xB03181B1,
+   0xD011C1D1, 0x20200020, 0xD417C7D3, 0x00020202, 0x20220222, 0x04040400, 0x68284860, 0x70314171,
+   0x04070703, 0xD81BCBD3, 0x9C1D8D91, 0x98198991, 0x60214161, 0xBC3E8EB2, 0xE426C6E2, 0x58194951,
+   0xDC1DCDD1, 0x50114151, 0x90108090, 0xDC1CCCD0, 0x981A8A92, 0xA02383A3, 0xA82B8BA3, 0xD010C0D0,
+   0x80018181, 0x0C0F0F03, 0x44074743, 0x181A0A12, 0xE023C3E3, 0xEC2CCCE0, 0x8C0D8D81, 0xBC3F8FB3,
+   0x94168692, 0x783B4B73, 0x5C1C4C50, 0xA02282A2, 0xA02181A1, 0x60234363, 0x20230323, 0x4C0D4D41,
+   0xC808C8C0, 0x9C1E8E92, 0x9C1C8C90, 0x383A0A32, 0x0C0C0C00, 0x2C2E0E22, 0xB83A8AB2, 0x6C2E4E62,
+   0x9C1F8F93, 0x581A4A52, 0xF032C2F2, 0x90128292, 0xF033C3F3, 0x48094941, 0x78384870, 0xCC0CCCC0,
+   0x14150511, 0xF83BCBF3, 0x70304070, 0x74354571, 0x7C3F4F73, 0x34350531, 0x10100010, 0x00030303,
+   0x64244460, 0x6C2D4D61, 0xC406C6C2, 0x74344470, 0xD415C5D1, 0xB43484B0, 0xE82ACAE2, 0x08090901,
+   0x74364672, 0x18190911, 0xFC3ECEF2, 0x40004040, 0x10120212, 0xE020C0E0, 0xBC3D8DB1, 0x04050501,
+   0xF83ACAF2, 0x00010101, 0xF030C0F0, 0x282A0A22, 0x5C1E4E52, 0xA82989A1, 0x54164652, 0x40034343,
+   0x84058581, 0x14140410, 0x88098981, 0x981B8B93, 0xB03080B0, 0xE425C5E1, 0x48084840, 0x78394971,
+   0x94178793, 0xFC3CCCF0, 0x1C1E0E12, 0x80028282, 0x20210121, 0x8C0C8C80, 0x181B0B13, 0x5C1F4F53,
+   0x74374773, 0x54144450, 0xB03282B2, 0x1C1D0D11, 0x24250521, 0x4C0F4F43, 0x00000000, 0x44064642,
+   0xEC2DCDE1, 0x58184850, 0x50124252, 0xE82BCBE3, 0x7C3E4E72, 0xD81ACAD2, 0xC809C9C1, 0xFC3DCDF1,
+   0x30300030, 0x94158591, 0x64254561, 0x3C3C0C30, 0xB43686B2, 0xE424C4E0, 0xB83B8BB3, 0x7C3C4C70,
+   0x0C0E0E02, 0x50104050, 0x38390931, 0x24260622, 0x30320232, 0x84048480, 0x68294961, 0x90138393,
+   0x34370733, 0xE427C7E3, 0x24240420, 0xA42484A0, 0xC80BCBC3, 0x50134353, 0x080A0A02, 0x84078783,
+   0xD819C9D1, 0x4C0C4C40, 0x80038383, 0x8C0F8F83, 0xCC0ECEC2, 0x383B0B33, 0x480A4A42, 0xB43787B3
+};
+
+//S-Box SS2
+static const uint32_t ss2[256] =
+{
+   0xA1A82989, 0x81840585, 0xD2D416C6, 0xD3D013C3, 0x50541444, 0x111C1D0D, 0xA0AC2C8C, 0x21242505,
+   0x515C1D4D, 0x43400343, 0x10181808, 0x121C1E0E, 0x51501141, 0xF0FC3CCC, 0xC2C80ACA, 0x63602343,
+   0x20282808, 0x40440444, 0x20202000, 0x919C1D8D, 0xE0E020C0, 0xE2E022C2, 0xC0C808C8, 0x13141707,
+   0xA1A42585, 0x838C0F8F, 0x03000303, 0x73783B4B, 0xB3B83B8B, 0x13101303, 0xD2D012C2, 0xE2EC2ECE,
+   0x70703040, 0x808C0C8C, 0x333C3F0F, 0xA0A82888, 0x32303202, 0xD1DC1DCD, 0xF2F436C6, 0x70743444,
+   0xE0EC2CCC, 0x91941585, 0x03080B0B, 0x53541747, 0x505C1C4C, 0x53581B4B, 0xB1BC3D8D, 0x01000101,
+   0x20242404, 0x101C1C0C, 0x73703343, 0x90981888, 0x10101000, 0xC0CC0CCC, 0xF2F032C2, 0xD1D819C9,
+   0x202C2C0C, 0xE3E427C7, 0x72703242, 0x83800383, 0x93981B8B, 0xD1D011C1, 0x82840686, 0xC1C809C9,
+   0x60602040, 0x50501040, 0xA3A02383, 0xE3E82BCB, 0x010C0D0D, 0xB2B43686, 0x929C1E8E, 0x434C0F4F,
+   0xB3B43787, 0x52581A4A, 0xC2C406C6, 0x70783848, 0xA2A42686, 0x12101202, 0xA3AC2F8F, 0xD1D415C5,
+   0x61602141, 0xC3C003C3, 0xB0B43484, 0x41400141, 0x52501242, 0x717C3D4D, 0x818C0D8D, 0x00080808,
+   0x131C1F0F, 0x91981989, 0x00000000, 0x11181909, 0x00040404, 0x53501343, 0xF3F437C7, 0xE1E021C1,
+   0xF1FC3DCD, 0x72743646, 0x232C2F0F, 0x23242707, 0xB0B03080, 0x83880B8B, 0x020C0E0E, 0xA3A82B8B,
+   0xA2A02282, 0x626C2E4E, 0x93901383, 0x414C0D4D, 0x61682949, 0x707C3C4C, 0x01080909, 0x02080A0A,
+   0xB3BC3F8F, 0xE3EC2FCF, 0xF3F033C3, 0xC1C405C5, 0x83840787, 0x10141404, 0xF2FC3ECE, 0x60642444,
+   0xD2DC1ECE, 0x222C2E0E, 0x43480B4B, 0x12181A0A, 0x02040606, 0x21202101, 0x63682B4B, 0x62642646,
+   0x02000202, 0xF1F435C5, 0x92901282, 0x82880A8A, 0x000C0C0C, 0xB3B03383, 0x727C3E4E, 0xD0D010C0,
+   0x72783A4A, 0x43440747, 0x92941686, 0xE1E425C5, 0x22242606, 0x80800080, 0xA1AC2D8D, 0xD3DC1FCF,
+   0xA1A02181, 0x30303000, 0x33343707, 0xA2AC2E8E, 0x32343606, 0x11141505, 0x22202202, 0x30383808,
+   0xF0F434C4, 0xA3A42787, 0x41440545, 0x404C0C4C, 0x81800181, 0xE1E829C9, 0x80840484, 0x93941787,
+   0x31343505, 0xC3C80BCB, 0xC2CC0ECE, 0x303C3C0C, 0x71703141, 0x11101101, 0xC3C407C7, 0x81880989,
+   0x71743545, 0xF3F83BCB, 0xD2D81ACA, 0xF0F838C8, 0x90941484, 0x51581949, 0x82800282, 0xC0C404C4,
+   0xF3FC3FCF, 0x41480949, 0x31383909, 0x63642747, 0xC0C000C0, 0xC3CC0FCF, 0xD3D417C7, 0xB0B83888,
+   0x030C0F0F, 0x828C0E8E, 0x42400242, 0x23202303, 0x91901181, 0x606C2C4C, 0xD3D81BCB, 0xA0A42484,
+   0x30343404, 0xF1F031C1, 0x40480848, 0xC2C002C2, 0x636C2F4F, 0x313C3D0D, 0x212C2D0D, 0x40400040,
+   0xB2BC3E8E, 0x323C3E0E, 0xB0BC3C8C, 0xC1C001C1, 0xA2A82A8A, 0xB2B83A8A, 0x424C0E4E, 0x51541545,
+   0x33383B0B, 0xD0DC1CCC, 0x60682848, 0x737C3F4F, 0x909C1C8C, 0xD0D818C8, 0x42480A4A, 0x52541646,
+   0x73743747, 0xA0A02080, 0xE1EC2DCD, 0x42440646, 0xB1B43585, 0x23282B0B, 0x61642545, 0xF2F83ACA,
+   0xE3E023C3, 0xB1B83989, 0xB1B03181, 0x939C1F8F, 0x525C1E4E, 0xF1F839C9, 0xE2E426C6, 0xB2B03282,
+   0x31303101, 0xE2E82ACA, 0x616C2D4D, 0x535C1F4F, 0xE0E424C4, 0xF0F030C0, 0xC1CC0DCD, 0x80880888,
+   0x12141606, 0x32383A0A, 0x50581848, 0xD0D414C4, 0x62602242, 0x21282909, 0x03040707, 0x33303303,
+   0xE0E828C8, 0x13181B0B, 0x01040505, 0x71783949, 0x90901080, 0x62682A4A, 0x22282A0A, 0x92981A8A
+};
+
+//S-Box SS3
+static const uint32_t ss3[256] =
+{
+   0x08303838, 0xC8E0E828, 0x0D212C2D, 0x86A2A426, 0xCFC3CC0F, 0xCED2DC1E, 0x83B3B033, 0x88B0B838,
+   0x8FA3AC2F, 0x40606020, 0x45515415, 0xC7C3C407, 0x44404404, 0x4F636C2F, 0x4B63682B, 0x4B53581B,
+   0xC3C3C003, 0x42626022, 0x03333033, 0x85B1B435, 0x09212829, 0x80A0A020, 0xC2E2E022, 0x87A3A427,
+   0xC3D3D013, 0x81919011, 0x01111011, 0x06020406, 0x0C101C1C, 0x8CB0BC3C, 0x06323436, 0x4B43480B,
+   0xCFE3EC2F, 0x88808808, 0x4C606C2C, 0x88A0A828, 0x07131417, 0xC4C0C404, 0x06121416, 0xC4F0F434,
+   0xC2C2C002, 0x45414405, 0xC1E1E021, 0xC6D2D416, 0x0F333C3F, 0x0D313C3D, 0x8E828C0E, 0x88909818,
+   0x08202828, 0x4E424C0E, 0xC6F2F436, 0x0E323C3E, 0x85A1A425, 0xC9F1F839, 0x0D010C0D, 0xCFD3DC1F,
+   0xC8D0D818, 0x0B23282B, 0x46626426, 0x4A72783A, 0x07232427, 0x0F232C2F, 0xC1F1F031, 0x42727032,
+   0x42424002, 0xC4D0D414, 0x41414001, 0xC0C0C000, 0x43737033, 0x47636427, 0x8CA0AC2C, 0x8B83880B,
+   0xC7F3F437, 0x8DA1AC2D, 0x80808000, 0x0F131C1F, 0xCAC2C80A, 0x0C202C2C, 0x8AA2A82A, 0x04303434,
+   0xC2D2D012, 0x0B03080B, 0xCEE2EC2E, 0xC9E1E829, 0x4D515C1D, 0x84909414, 0x08101818, 0xC8F0F838,
+   0x47535417, 0x8EA2AC2E, 0x08000808, 0xC5C1C405, 0x03131013, 0xCDC1CC0D, 0x86828406, 0x89B1B839,
+   0xCFF3FC3F, 0x4D717C3D, 0xC1C1C001, 0x01313031, 0xC5F1F435, 0x8A82880A, 0x4A62682A, 0x81B1B031,
+   0xC1D1D011, 0x00202020, 0xC7D3D417, 0x02020002, 0x02222022, 0x04000404, 0x48606828, 0x41717031,
+   0x07030407, 0xCBD3D81B, 0x8D919C1D, 0x89919819, 0x41616021, 0x8EB2BC3E, 0xC6E2E426, 0x49515819,
+   0xCDD1DC1D, 0x41515011, 0x80909010, 0xCCD0DC1C, 0x8A92981A, 0x83A3A023, 0x8BA3A82B, 0xC0D0D010,
+   0x81818001, 0x0F030C0F, 0x47434407, 0x0A12181A, 0xC3E3E023, 0xCCE0EC2C, 0x8D818C0D, 0x8FB3BC3F,
+   0x86929416, 0x4B73783B, 0x4C505C1C, 0x82A2A022, 0x81A1A021, 0x43636023, 0x03232023, 0x4D414C0D,
+   0xC8C0C808, 0x8E929C1E, 0x8C909C1C, 0x0A32383A, 0x0C000C0C, 0x0E222C2E, 0x8AB2B83A, 0x4E626C2E,
+   0x8F939C1F, 0x4A52581A, 0xC2F2F032, 0x82929012, 0xC3F3F033, 0x49414809, 0x48707838, 0xCCC0CC0C,
+   0x05111415, 0xCBF3F83B, 0x40707030, 0x45717435, 0x4F737C3F, 0x05313435, 0x00101010, 0x03030003,
+   0x44606424, 0x4D616C2D, 0xC6C2C406, 0x44707434, 0xC5D1D415, 0x84B0B434, 0xCAE2E82A, 0x09010809,
+   0x46727436, 0x09111819, 0xCEF2FC3E, 0x40404000, 0x02121012, 0xC0E0E020, 0x8DB1BC3D, 0x05010405,
+   0xCAF2F83A, 0x01010001, 0xC0F0F030, 0x0A22282A, 0x4E525C1E, 0x89A1A829, 0x46525416, 0x43434003,
+   0x85818405, 0x04101414, 0x89818809, 0x8B93981B, 0x80B0B030, 0xC5E1E425, 0x48404808, 0x49717839,
+   0x87939417, 0xCCF0FC3C, 0x0E121C1E, 0x82828002, 0x01212021, 0x8C808C0C, 0x0B13181B, 0x4F535C1F,
+   0x47737437, 0x44505414, 0x82B2B032, 0x0D111C1D, 0x05212425, 0x4F434C0F, 0x00000000, 0x46424406,
+   0xCDE1EC2D, 0x48505818, 0x42525012, 0xCBE3E82B, 0x4E727C3E, 0xCAD2D81A, 0xC9C1C809, 0xCDF1FC3D,
+   0x00303030, 0x85919415, 0x45616425, 0x0C303C3C, 0x86B2B436, 0xC4E0E424, 0x8BB3B83B, 0x4C707C3C,
+   0x0E020C0E, 0x40505010, 0x09313839, 0x06222426, 0x02323032, 0x84808404, 0x49616829, 0x83939013,
+   0x07333437, 0xC7E3E427, 0x04202424, 0x84A0A424, 0xCBC3C80B, 0x43535013, 0x0A02080A, 0x87838407,
+   0xC9D1D819, 0x4C404C0C, 0x83838003, 0x8F838C0F, 0xCEC2CC0E, 0x0B33383B, 0x4A42480A, 0x87B3B437
+};
+
+//Common interface for encryption algorithms
+const CipherAlgo seedCipherAlgo =
+{
+   "SEED",
+   sizeof(SeedContext),
+   CIPHER_ALGO_TYPE_BLOCK,
+   SEED_BLOCK_SIZE,
+   (CipherAlgoInit) seedInit,
+   NULL,
+   NULL,
+   (CipherAlgoEncryptBlock) seedEncryptBlock,
+   (CipherAlgoDecryptBlock) seedDecryptBlock
+};
+
+
+/**
+ * @brief Initialize a SEED context using the supplied key
+ * @param[in] context Pointer to the SEED context to initialize
+ * @param[in] key Pointer to the key
+ * @param[in] keyLength Length of the key
+ * @return Error code
+ **/
+
+error_t seedInit(SeedContext *context, const uint8_t *key, size_t keyLength)
+{
+   uint_t i;
+   uint32_t t;
+   uint32_t key0;
+   uint32_t key1;
+   uint32_t key2;
+   uint32_t key3;
+
+   //Invalid key length?
+   if(keyLength != 16)
+      return ERROR_INVALID_KEY_LENGTH;
+
+   //The 128-bit input key is divided into four 32-bit blocks
+   key0 = LOAD32BE(key + 0);
+   key1 = LOAD32BE(key + 4);
+   key2 = LOAD32BE(key + 8);
+   key3 = LOAD32BE(key + 12);
+
+   //Apply 16 rounds
+   for(i = 0; i < 16; i++)
+   {
+      t = key0 + key2 - kc[i];
+      context->ks[2 * i] = G(t);
+      t = key1 - key3 + kc[i];
+      context->ks[2 * i + 1] = G(t);
+
+      //Odd round?
+      if(i % 2)
+      {
+         t = (key3 << 8) | (key2 >> 24);
+         key2 = (key2 << 8) | (key3 >> 24);
+         key3 = t;
+      }
+      //Even round?
+      else
+      {
+         t = (key1 >> 8) | (key0 << 24);
+         key0 = (key0 >> 8) | (key1 << 24);
+         key1 = t;
+      }
+   }
+
+   //No error to report
+   return NO_ERROR;
+}
+
+
+/**
+ * @brief Encrypt a 16-byte block using SEED algorithm
+ * @param[in] context Pointer to the SEED context
+ * @param[in] input Plaintext block to encrypt
+ * @param[out] output Ciphertext block resulting from encryption
+ **/
+
+void seedEncryptBlock(SeedContext *context, const uint8_t *input, uint8_t *output)
+{
+   uint_t i;
+   uint32_t temp0;
+   uint32_t temp1;
+   uint32_t *ks;
+
+   //The 128-bit input is divided into two 64-bit blocks (L and R)
+   uint32_t left0 = LOAD32BE(input + 0);
+   uint32_t left1 = LOAD32BE(input + 4);
+   uint32_t right0 = LOAD32BE(input + 8);
+   uint32_t right1 = LOAD32BE(input + 12);
+
+   //The key schedule must be applied in ascending order
+   ks = context->ks;
+
+   //Perform 16 rounds
+   for(i = 0; i < 16; i++)
+   {
+      //Apply function F
+      F(ks[0], ks[1], right0, right1, temp0, temp1);
+
+      temp0 ^= left0;
+      temp1 ^= left1;
+      left0 = right0;
+      left1 = right1;
+      right0 = temp0;
+      right1 = temp1;
+
+      //Advance current location in key schedule
+      ks += 2;
+   }
+
+   //The resulting value is the ciphertext
+   STORE32BE(right0, output + 0);
+   STORE32BE(right1, output + 4);
+   STORE32BE(left0, output + 8);
+   STORE32BE(left1, output + 12);
+}
+
+
+/**
+ * @brief Decrypt a 16-byte block using SEED algorithm
+ * @param[in] context Pointer to the SEED context
+ * @param[in] input Ciphertext block to decrypt
+ * @param[out] output Plaintext block resulting from decryption
+ **/
+
+void seedDecryptBlock(SeedContext *context, const uint8_t *input, uint8_t *output)
+{
+   uint_t i;
+   uint32_t temp0;
+   uint32_t temp1;
+   uint32_t *ks;
+
+   //The 128-bit input is divided into two 64-bit blocks (L and R)
+   uint32_t left0 = LOAD32BE(input + 0);
+   uint32_t left1 = LOAD32BE(input + 4);
+   uint32_t right0 = LOAD32BE(input + 8);
+   uint32_t right1 = LOAD32BE(input + 12);
+
+   //The key schedule must be applied in reverse order
+   ks = context->ks + 30;
+
+   //Perform 16 rounds
+   for(i = 0; i < 16; i++)
+   {
+      //Apply function F
+      F(ks[0], ks[1], right0, right1, temp0, temp1);
+
+      temp0 ^= left0;
+      temp1 ^= left1;
+      left0 = right0;
+      left1 = right1;
+      right0 = temp0;
+      right1 = temp1;
+
+      //Advance current location in key schedule
+      ks -= 2;
+   }
+
+   //The resulting value is the plaintext
+   STORE32BE(right0, output + 0);
+   STORE32BE(right1, output + 4);
+   STORE32BE(left0, output + 8);
+   STORE32BE(left1, output + 12);
+}
+
+#endif
+