serpent.c File Reference

Serpent encryption algorithm. More...

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

Go to the source code of this file.

Macros
#define	TRACE_LEVEL   CRYPTO_TRACE_LEVEL
#define	PHI   0x9E3779B9
#define	SBOX0(r0, r1, r2, r3)
#define	SBOX0_INV(r0, r1, r2, r3)
#define	SBOX1(r0, r1, r2, r3)
#define	SBOX1_INV(r0, r1, r2, r3)
#define	SBOX2(r0, r1, r2, r3)
#define	SBOX2_INV(r0, r1, r2, r3)
#define	SBOX3(r0, r1, r2, r3)
#define	SBOX3_INV(r0, r1, r2, r3)
#define	SBOX4(r0, r1, r2, r3)
#define	SBOX4_INV(r0, r1, r2, r3)
#define	SBOX5(r0, r1, r2, r3)
#define	SBOX5_INV(r0, r1, r2, r3)
#define	SBOX6(r0, r1, r2, r3)
#define	SBOX6_INV(r0, r1, r2, r3)
#define	SBOX7(r0, r1, r2, r3)
#define	SBOX7_INV(r0, r1, r2, r3)
#define	LT(x0, x1, x2, x3)
#define	LT_INV(x0, x1, x2, x3)
#define	XOR(x0, x1, x2, x3, k)
#define	ROUND(n, x0, x1, x2, x3, k)
#define	ROUND_INV(n, x0, x1, x2, x3, k)

Functions
error_t	serpentInit (SerpentContext *context, const uint8_t *key, size_t keyLen)
	Key expansion. More...
void	serpentEncryptBlock (SerpentContext *context, const uint8_t *input, uint8_t *output)
	Encrypt a 16-byte block using Serpent algorithm. More...
void	serpentDecryptBlock (SerpentContext *context, const uint8_t *input, uint8_t *output)
	Decrypt a 16-byte block using Serpent algorithm. More...
void	serpentDeinit (SerpentContext *context)
	Release Serpent context. More...

Variables
const CipherAlgo	serpentCipherAlgo

Detailed Description

Serpent encryption algorithm.

License

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

Copyright (C) 2010-2024 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.

Description

Serpent is a block cipher algorithm which supports a key size of 128, 192 or 256 bits. S-box functions are implemented as per Dag Arne Osvik's paper "Speeding up Serpent"

Author

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

Version

2.4.0

Definition in file serpent.c.

Macro Definition Documentation

LT

#define LT	(		x0,
			x1,
			x2,
			x3
	)

Value:

{ \
   x0 = ROL32(x0, 13); \
   x2 = ROL32(x2, 3); \
   x1 ^= x0 ^ x2; \
   x3 ^= x2 ^ (x0 << 3); \
   x1 = ROL32(x1, 1); \
   x3 = ROL32(x3, 7); \
   x0 ^= x1 ^ x3; \
   x2 ^= x3 ^ (x1 << 7); \
   x0 = ROL32(x0, 5); \
   x2 = ROL32(x2, 22); \
}

Definition at line 324 of file serpent.c.

LT_INV

#define LT_INV	(		x0,
			x1,
			x2,
			x3
	)

Value:

{ \
   x2 = ROR32(x2, 22); \
   x0 = ROR32(x0, 5); \
   x2 ^= x3 ^ (x1 << 7); \
   x0 ^= x1 ^ x3; \
   x3 = ROR32(x3, 7); \
   x1 = ROR32(x1, 1); \
   x3 ^= x2 ^ (x0 << 3); \
   x1 ^= x0 ^ x2; \
   x2 = ROR32(x2, 3); \
   x0 = ROR32(x0, 13); \
}

Definition at line 339 of file serpent.c.

PHI

#define PHI   0x9E3779B9

Definition at line 48 of file serpent.c.

ROUND

#define ROUND	(		n,
			x0,
			x1,
			x2,
			x3,
			k
	)

Value:

{ \
   XOR(x0, x1, x2, x3, k); \
   SBOX##n(x0, x1, x2, x3); \
   LT(x0, x1, x2, x3); \
}

Definition at line 363 of file serpent.c.

ROUND_INV

#define ROUND_INV	(		n,
			x0,
			x1,
			x2,
			x3,
			k
	)

Value:

{ \
   LT_INV(x0, x1, x2, x3); \
   SBOX##n##_INV(x0, x1, x2, x3); \
   XOR(x0, x1, x2, x3, k); \
}

Definition at line 371 of file serpent.c.

SBOX0

#define SBOX0	(		r0,
			r1,
			r2,
			r3
	)

Value:

{ \
   uint32_t r4; \
   r3 ^= r0; r4 = r1; \
   r1 &= r3; r4 ^= r2; \
   r1 ^= r0; r0 |= r3; \
   r0 ^= r4; r4 ^= r3; \
   r3 ^= r2; r2 |= r1; \
   r2 ^= r4; r4 = ~r4; \
   r4 |= r1; r1 ^= r3; \
   r1 ^= r4; r3 |= r0; \
   r1 ^= r3; r4 ^= r3; \
   r3 = r0; r0 = r1; r1 = r4; \
}

Definition at line 51 of file serpent.c.

SBOX0_INV

#define SBOX0_INV	(		r0,
			r1,
			r2,
			r3
	)

Value:

{ \
   uint32_t r4; \
   r2 = ~r2; r4 = r1; \
   r1 |= r0; r4 = ~r4; \
   r1 ^= r2; r2 |= r4; \
   r1 ^= r3; r0 ^= r4; \
   r2 ^= r0; r0 &= r3; \
   r4 ^= r0; r0 |= r1; \
   r0 ^= r2; r3 ^= r4; \
   r2 ^= r1; r3 ^= r0; \
   r3 ^= r1; \
   r2 &= r3; \
   r4 ^= r2; \
   r2 = r1; r1 = r4; \
}

Definition at line 67 of file serpent.c.

SBOX1

#define SBOX1	(		r0,
			r1,
			r2,
			r3
	)

Value:

{ \
   uint32_t r4; \
   r0 = ~r0; r2 = ~r2; \
   r4 = r0; r0 &= r1; \
   r2 ^= r0; r0 |= r3; \
   r3 ^= r2; r1 ^= r0; \
   r0 ^= r4; r4 |= r1; \
   r1 ^= r3; r2 |= r0; \
   r2 &= r4; r0 ^= r1; \
   r1 &= r2; \
   r1 ^= r0; r0 &= r2; \
   r0 ^= r4; \
   r4 = r0; r0 = r2; r2 = r3; r3 = r1; r1 = r4; \
}

Definition at line 85 of file serpent.c.

SBOX1_INV

#define SBOX1_INV	(		r0,
			r1,
			r2,
			r3
	)

Value:

{ \
   uint32_t r4; \
   r4 = r1; r1 ^= r3; \
   r3 &= r1; r4 ^= r2; \
   r3 ^= r0; r0 |= r1; \
   r2 ^= r3; r0 ^= r4; \
   r0 |= r2; r1 ^= r3; \
   r0 ^= r1; r1 |= r3; \
   r1 ^= r0; r4 = ~r4; \
   r4 ^= r1; r1 |= r0; \
   r1 ^= r0; \
   r1 |= r4; \
   r3 ^= r1; \
   r1 = r0; r0 = r4; r4 = r2; r2 = r3; r3 = r4; \
}

Definition at line 102 of file serpent.c.

SBOX2

#define SBOX2	(		r0,
			r1,
			r2,
			r3
	)

Value:

{ \
   uint32_t r4; \
   r4 = r0; r0 &= r2; \
   r0 ^= r3; r2 ^= r1; \
   r2 ^= r0; r3 |= r4; \
   r3 ^= r1; r4 ^= r2; \
   r1 = r3; r3 |= r4; \
   r3 ^= r0; r0 &= r1; \
   r4 ^= r0; r1 ^= r3; \
   r1 ^= r4; r4 = ~r4; \
   r0 = r2; r2 = r1; r1 = r3; r3 = r4; \
}

Definition at line 120 of file serpent.c.

SBOX2_INV

#define SBOX2_INV	(		r0,
			r1,
			r2,
			r3
	)

Value:

{ \
   uint32_t r4; \
   r2 ^= r3; r3 ^= r0; \
   r4 = r3; r3 &= r2; \
   r3 ^= r1; r1 |= r2; \
   r1 ^= r4; r4 &= r3; \
   r2 ^= r3; r4 &= r0; \
   r4 ^= r2; r2 &= r1; \
   r2 |= r0; r3 = ~r3; \
   r2 ^= r3; r0 ^= r3; \
   r0 &= r1; r3 ^= r4; \
   r3 ^= r0; \
   r0 = r1; r1 = r4; \
}

Definition at line 135 of file serpent.c.

SBOX3

#define SBOX3	(		r0,
			r1,
			r2,
			r3
	)

Value:

{ \
   uint32_t r4; \
   r4 = r0; r0 |= r3; \
   r3 ^= r1; r1 &= r4; \
   r4 ^= r2; r2 ^= r3; \
   r3 &= r0; r4 |= r1; \
   r3 ^= r4; r0 ^= r1; \
   r4 &= r0; r1 ^= r3; \
   r4 ^= r2; r1 |= r0; \
   r1 ^= r2; r0 ^= r3; \
   r2 = r1; r1 |= r3; \
   r1 ^= r0; \
   r0 = r1; r1 = r2; r2 = r3; r3 = r4; \
}

Definition at line 152 of file serpent.c.

SBOX3_INV

#define SBOX3_INV	(		r0,
			r1,
			r2,
			r3
	)

Value:

{ \
   uint32_t r4; \
   r4 = r2; r2 ^= r1; \
   r0 ^= r2; r4 &= r2; \
   r4 ^= r0; r0 &= r1; \
   r1 ^= r3; r3 |= r4; \
   r2 ^= r3; r0 ^= r3; \
   r1 ^= r4; r3 &= r2; \
   r3 ^= r1; r1 ^= r0; \
   r1 |= r2; r0 ^= r3; \
   r1 ^= r4; \
   r0 ^= r1; \
   r4 = r0; r0 = r2; r2 = r3; r3 = r4; \
}

Definition at line 169 of file serpent.c.

SBOX4

#define SBOX4	(		r0,
			r1,
			r2,
			r3
	)

Value:

{ \
   uint32_t r4; \
   r1 ^= r3; r3 = ~r3; \
   r2 ^= r3; r3 ^= r0; \
   r4 = r1; r1 &= r3; \
   r1 ^= r2; r4 ^= r3; \
   r0 ^= r4; r2 &= r4; \
   r2 ^= r0; r0 &= r1; \
   r3 ^= r0; r4 |= r1; \
   r4 ^= r0; r0 |= r3; \
   r0 ^= r2; r2 &= r3; \
   r0 = ~r0; r4 ^= r2; \
   r2 = r0; r0 = r1; r1 = r4; \
}

Definition at line 186 of file serpent.c.

SBOX4_INV

#define SBOX4_INV	(		r0,
			r1,
			r2,
			r3
	)

Value:

{ \
   uint32_t r4; \
   r4 = r2; r2 &= r3; \
   r2 ^= r1; r1 |= r3; \
   r1 &= r0; r4 ^= r2; \
   r4 ^= r1; r1 &= r2; \
   r0 = ~r0; r3 ^= r4; \
   r1 ^= r3; r3 &= r0; \
   r3 ^= r2; r0 ^= r1; \
   r2 &= r0; r3 ^= r0; \
   r2 ^= r4; \
   r2 |= r3; r3 ^= r0; \
   r2 ^= r1; \
   r1 = r3; r3 = r4; \
}

Definition at line 204 of file serpent.c.

SBOX5

#define SBOX5	(		r0,
			r1,
			r2,
			r3
	)

Value:

{ \
   uint32_t r4; \
   r0 ^= r1; r1 ^= r3; \
   r3 = ~r3; r4 = r1; \
   r1 &= r0; r2 ^= r3; \
   r1 ^= r2; r2 |= r4; \
   r4 ^= r3; r3 &= r1; \
   r3 ^= r0; r4 ^= r1; \
   r4 ^= r2; r2 ^= r0; \
   r0 &= r3; r2 = ~r2; \
   r0 ^= r4; r4 |= r3; \
   r2 ^= r4; \
   r4 = r0; r0 = r1; r1 = r3; r3 = r2; r2 = r4; \
}

Definition at line 222 of file serpent.c.

SBOX5_INV

#define SBOX5_INV	(		r0,
			r1,
			r2,
			r3
	)

Value:

{ \
   uint32_t r4; \
   r1 = ~r1; r4 = r3; \
   r2 ^= r1; r3 |= r0; \
   r3 ^= r2; r2 |= r1; \
   r2 &= r0; r4 ^= r3; \
   r2 ^= r4; r4 |= r0; \
   r4 ^= r1; r1 &= r2; \
   r1 ^= r3; r4 ^= r2; \
   r3 &= r4; r4 ^= r1; \
   r3 ^= r4; r4 = ~r4; \
   r3 ^= r0; \
   r0 = r1; r1 = r4; r4 = r2; r2 = r3; r3 = r4; \
}

Definition at line 239 of file serpent.c.

SBOX6

#define SBOX6	(		r0,
			r1,
			r2,
			r3
	)

Value:

{ \
   uint32_t r4; \
   r2 = ~r2; r4 = r3; \
   r3 &= r0; r0 ^= r4; \
   r3 ^= r2; r2 |= r4; \
   r1 ^= r3; r2 ^= r0; \
   r0 |= r1; r2 ^= r1; \
   r4 ^= r0; r0 |= r3; \
   r0 ^= r2; r4 ^= r3; \
   r4 ^= r0; r3 = ~r3; \
   r2 &= r4; \
   r2 ^= r3; \
   r3 = r2; r2 = r4; \
}

Definition at line 256 of file serpent.c.

SBOX6_INV

#define SBOX6_INV	(		r0,
			r1,
			r2,
			r3
	)

Value:

{ \
   uint32_t r4; \
   r0 ^= r2; r4 = r2; \
   r2 &= r0; r4 ^= r3; \
   r2 = ~r2; r3 ^= r1; \
   r2 ^= r3; r4 |= r0; \
   r0 ^= r2; r3 ^= r4; \
   r4 ^= r1; r1 &= r3; \
   r1 ^= r0; r0 ^= r3; \
   r0 |= r2; r3 ^= r1; \
   r4 ^= r0; \
   r0 = r1; r1 = r2; r2 = r4; \
}

Definition at line 273 of file serpent.c.

SBOX7

#define SBOX7	(		r0,
			r1,
			r2,
			r3
	)

Value:

{ \
   uint32_t r4; \
   r4 = r1; r1 |= r2; \
   r1 ^= r3; r4 ^= r2; \
   r2 ^= r1; r3 |= r4; \
   r3 &= r0; r4 ^= r2; \
   r3 ^= r1; r1 |= r4; \
   r1 ^= r0; r0 |= r4; \
   r0 ^= r2; r1 ^= r4; \
   r2 ^= r1; r1 &= r0; \
   r1 ^= r4; r2 = ~r2; \
   r2 |= r0; \
   r4 ^= r2; \
   r2 = r1; r1 = r3; r3 = r0; r0 = r4; \
}

Definition at line 289 of file serpent.c.

SBOX7_INV

#define SBOX7_INV	(		r0,
			r1,
			r2,
			r3
	)

Value:

{ \
   uint32_t r4; \
   r4 = r2; r2 ^= r0; \
   r0 &= r3; r4 |= r3; \
   r2 = ~r2; r3 ^= r1; \
   r1 |= r0; r0 ^= r2; \
   r2 &= r4; r3 &= r4; \
   r1 ^= r2; r2 ^= r0; \
   r0 |= r2; r4 ^= r1; \
   r0 ^= r3; r3 ^= r4; \
   r4 |= r0; r3 ^= r2; \
   r4 ^= r2; \
   r2 = r1; r1 = r0; r0 = r3; r3 = r4; \
}

Definition at line 307 of file serpent.c.

TRACE_LEVEL

#define TRACE_LEVEL   CRYPTO_TRACE_LEVEL

Definition at line 38 of file serpent.c.

XOR

#define XOR	(		x0,
			x1,
			x2,
			x3,
			k
	)

Value:

{ \
   x0 ^= k[0]; \
   x1 ^= k[1]; \
   x2 ^= k[2]; \
   x3 ^= k[3]; \
}

Definition at line 354 of file serpent.c.

Function Documentation

serpentDecryptBlock()

void serpentDecryptBlock	(	SerpentContext *	context,
		const uint8_t *	input,
		uint8_t *	output
	)

Decrypt a 16-byte block using Serpent algorithm.

Parameters

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

Definition at line 543 of file serpent.c.

serpentDeinit()

void serpentDeinit

(

SerpentContext *

context

)

Release Serpent context.

Parameters

[in]

context

Pointer to the Serpent context

Definition at line 591 of file serpent.c.

serpentEncryptBlock()

void serpentEncryptBlock	(	SerpentContext *	context,
		const uint8_t *	input,
		uint8_t *	output
	)

Encrypt a 16-byte block using Serpent algorithm.

Parameters

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

Definition at line 495 of file serpent.c.

serpentInit()

error_t serpentInit	(	SerpentContext *	context,
		const uint8_t *	key,
		size_t	keyLen
	)

Key expansion.

Parameters

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

Returns

Error code

Definition at line 402 of file serpent.c.

Variable Documentation

serpentCipherAlgo

const CipherAlgo serpentCipherAlgo

Initial value:

=
{
   "Serpent",
   sizeof(SerpentContext),
   CIPHER_ALGO_TYPE_BLOCK,
   SERPENT_BLOCK_SIZE,
   (CipherAlgoInit) serpentInit,
   NULL,
   NULL,
   (CipherAlgoEncryptBlock) serpentEncryptBlock,
   (CipherAlgoDecryptBlock) serpentDecryptBlock,
   (CipherAlgoDeinit) serpentDeinit
}

Definition at line 379 of file serpent.c.