mars.c File Reference

MARS encryption algorithm. More...

#include "core/crypto.h"
#include "cipher/mars.h"

Go to the source code of this file.

Macros
#define	TRACE_LEVEL   CRYPTO_TRACE_LEVEL
#define	S(n)   sbox[(n) & 0x1FF]
#define	S0(n)   sbox[(n) & 0xFF]
#define	S1(n)   sbox[((n) & 0xFF) + 256]
#define	F_MIX(a, b, c, d)
#define	B_MIX(a, b, c, d)
#define	CORE(a, b, c, d, k1, k2)
#define	CORE_INV(a, b, c, d, k1, k2)
#define	MASK_GEN(m, w)

Functions
error_t	marsInit (MarsContext *context, const uint8_t *key, size_t keyLen)
	Key expansion. More...
void	marsEncryptBlock (MarsContext *context, const uint8_t *input, uint8_t *output)
	Encrypt a 16-byte block using MARS algorithm. More...
void	marsDecryptBlock (MarsContext *context, const uint8_t *input, uint8_t *output)
	Decrypt a 16-byte block using MARS algorithm. More...
void	marsDeinit (MarsContext *context)
	Release MARS context. More...

Variables
const CipherAlgo	marsCipherAlgo

Detailed Description

MARS encryption algorithm.

License

SPDX-License-Identifier: GPL-2.0-or-later

Copyright (C) 2010-2025 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.

Author

Oryx Embedded SARL (www.oryx-embedded.com)

Version

2.5.4

Definition in file mars.c.

Macro Definition Documentation

B_MIX

#define B_MIX	(		a,
			b,
			c,
			d
	)

Value:

{ \
   uint32_t t; \
   b ^= S1(a); \
   t = ROL32(a, 8); \
   c -= S0(t); \
   t = ROL32(a, 16); \
   d -= S1(t); \
   a = ROL32(a, 24); \
   d ^= S0(a); \
}

Definition at line 62 of file mars.c.

CORE

#define CORE	(		a,
			b,
			c,
			d,
			k1,
			k2
	)

Value:

{ \
   uint32_t r; \
   uint32_t l; \
   uint32_t m; \
   m = a + k1; \
   a = ROL32(a, 13); \
   r = a * k2; \
   r = ROL32(r, 5); \
   c += ROL32(m, r & 0x1F); \
   l = S(m) ^ r; \
   r = ROL32(r, 5); \
   l ^= r; \
   d ^= r; \
   b += ROL32(l, r & 0x1F); \
}

Definition at line 75 of file mars.c.

CORE_INV

#define CORE_INV	(		a,
			b,
			c,
			d,
			k1,
			k2
	)

Value:

{ \
   uint32_t r; \
   uint32_t l; \
   uint32_t m; \
   r = a * k2; \
   a = ROR32(a, 13); \
   m = a + k1; \
   r = ROL32(r, 5); \
   c -= ROL32(m, r & 0x1F); \
   l = S(m) ^ r; \
   r = ROL32(r, 5); \
   l ^= r; \
   d ^= r; \
   b -= ROL32(l, r & 0x1F); \
};

Definition at line 93 of file mars.c.

F_MIX

#define F_MIX	(		a,
			b,
			c,
			d
	)

Value:

{ \
   uint32_t t; \
   b ^= S0(a); \
   t = ROR32(a, 8); \
   b += S1(t); \
   t = ROR32(a, 16); \
   c += S0(t); \
   a = ROR32(a, 24); \
   d ^= S1(a); \
}

Definition at line 49 of file mars.c.

MASK_GEN

#define MASK_GEN	(		m,
			w
	)

Value:

{ \
   m = ~w ^ (w >> 1); \
   m &= 0x7FFFFFFF; \
   m &= (m >> 1) & (m >> 2); \
   m &= (m >> 3) & (m >> 6); \
   if(m != 0) \
   { \
      m <<= 1; \
      m |= (m << 1); \
      m |= (m << 2); \
      m |= (m << 4); \
      m &= 0xFFFFFFFC; \
   } \
}

Definition at line 111 of file mars.c.

S

#define S

(

n

)

sbox[(n) & 0x1FF]

Definition at line 42 of file mars.c.

S0

#define S0

(

n

)

sbox[(n) & 0xFF]

Definition at line 44 of file mars.c.

S1

#define S1

(

n

)

sbox[((n) & 0xFF) + 256]

Definition at line 46 of file mars.c.

TRACE_LEVEL

#define TRACE_LEVEL   CRYPTO_TRACE_LEVEL

Definition at line 32 of file mars.c.

Function Documentation

marsDecryptBlock()

void marsDecryptBlock	(	MarsContext *	context,
		const uint8_t *	input,
		uint8_t *	output
	)

Decrypt a 16-byte block using MARS algorithm.

Parameters

[in]	context	Pointer to the MARS context
[in]	input	Ciphertext block to decrypt
[out]	output	Plaintext block resulting from decryption

Definition at line 421 of file mars.c.

marsDeinit()

void marsDeinit

(

MarsContext *

context

)

Release MARS context.

Parameters

[in]

context

Pointer to the MARS context

Definition at line 506 of file mars.c.

marsEncryptBlock()

void marsEncryptBlock	(	MarsContext *	context,
		const uint8_t *	input,
		uint8_t *	output
	)

Encrypt a 16-byte block using MARS algorithm.

Parameters

[in]	context	Pointer to the MARS context
[in]	input	Plaintext block to encrypt
[out]	output	Ciphertext block resulting from encryption

Definition at line 334 of file mars.c.

marsInit()

error_t marsInit	(	MarsContext *	context,
		const uint8_t *	key,
		size_t	keyLen
	)

Key expansion.

Parameters

[in]	context	Pointer to the MARS context to initialize
[in]	key	Pointer to the key
[in]	keyLen	Length of the key

Returns

Error code

Definition at line 226 of file mars.c.

Variable Documentation

marsCipherAlgo

const CipherAlgo marsCipherAlgo

Initial value:

=
{
   "MARS",
   sizeof(MarsContext),
   CIPHER_ALGO_TYPE_BLOCK,
   MARS_BLOCK_SIZE,
   (CipherAlgoInit) marsInit,
   NULL,
   NULL,
   (CipherAlgoEncryptBlock) marsEncryptBlock,
   (CipherAlgoDecryptBlock) marsDecryptBlock,
   (CipherAlgoDeinit) marsDeinit
}

Definition at line 203 of file mars.c.