des.c File Reference

DES (Data Encryption Standard) More...

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

Go to the source code of this file.

Macros
#define	TRACE_LEVEL   CRYPTO_TRACE_LEVEL
#define	ROL28(a, n)   ((((a) << (n)) | ((a) >> (28 - (n)))) & 0x0FFFFFFF)
#define	SWAPMOVE(a, b, n, m)
#define	IP(l, r)
#define	IP_INV(l, r)
#define	PC1(c, d)
#define	PC2_L(c, d)
#define	PC2_R(c, d)
#define	ROUND(l, r, k1, k2)

Functions
__weak_func error_t	desInit (DesContext *context, const uint8_t *key, size_t keyLen)
	Initialize a DES context using the supplied key. More...
__weak_func void	desEncryptBlock (DesContext *context, const uint8_t *input, uint8_t *output)
	Encrypt a 8-byte block using DES algorithm. More...
__weak_func void	desDecryptBlock (DesContext *context, const uint8_t *input, uint8_t *output)
	Decrypt a 8-byte block using DES algorithm. More...
__weak_func void	desDeinit (DesContext *context)
	Release DES context. More...

Variables
const uint8_t	DES_CBC_OID [5] = {0x2B, 0x0E, 0x03, 0x02, 0x07}
const CipherAlgo	desCipherAlgo

Detailed Description

DES (Data Encryption Standard)

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

DES is an encryption algorithm designed to encipher and decipher blocks of 64 bits under control of a 64-bit key. Refer to FIPS 46-3 for more details

Author

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

Version

2.4.4

Definition in file des.c.

Macro Definition Documentation

IP

#define IP	(		l,
			r
	)

Value:

{ \
   SWAPMOVE(l, r, 4, 0x0F0F0F0F); \
   SWAPMOVE(l, r, 16, 0x0000FFFF); \
   SWAPMOVE(r, l, 2, 0x33333333); \
   SWAPMOVE(r, l, 8, 0x00FF00FF); \
   SWAPMOVE(l, r, 1, 0x55555555); \
   l = ROL32(l, 1); \
   r = ROL32(r, 1); \
}

Definition at line 58 of file des.c.

IP_INV

#define IP_INV	(		l,
			r
	)

Value:

{ \
   l = ROR32(l, 1); \
   r = ROR32(r, 1); \
   SWAPMOVE(l, r, 1, 0x55555555); \
   SWAPMOVE(r, l, 8, 0x00FF00FF); \
   SWAPMOVE(r, l, 2, 0x33333333); \
   SWAPMOVE(l, r, 16, 0x0000FFFF); \
   SWAPMOVE(l, r, 4, 0x0F0F0F0F); \
}

Definition at line 70 of file des.c.

PC1

#define PC1	(		c,
			d
	)

Value:

{ \
   SWAPMOVE(c, d, 4, 0x0F0F0F0F); \
   SWAPMOVE(c, d, 16, 0x0000FFFF); \
   SWAPMOVE(d, c, 2, 0x33333333); \
   SWAPMOVE(d, c, 8, 0x00FF00FF); \
   SWAPMOVE(c, d, 1, 0x55555555); \
   SWAPMOVE(d, c, 8, 0x00FF00FF); \
   SWAPMOVE(c, d, 16, 0x0000FFFF); \
   t = (c << 4) & 0x0FFFFFF0; \
   t |= (d >> 24) & 0x0000000F; \
   c = (d << 20) & 0x0FF00000; \
   c |= (d << 4) & 0x000FF000; \
   c |= (d >> 12) & 0x00000FF0; \
   c |= (d >> 28) & 0x0000000F; \
   d = t; \
}

Definition at line 82 of file des.c.

PC2_L

#define PC2_L	(		c,
			d
	)

Value:

   (((c << 4) & 0x24000000) | \
   ((c << 28) & 0x10000000) | \
   ((c << 14) & 0x08000000) | \
   ((c << 18) & 0x02080000) | \
   ((c << 6) & 0x01000000) | \
   ((c << 9) & 0x00200000) | \
   ((c >> 1) & 0x00100000) | \
   ((c << 10) & 0x00040000) | \
   ((c << 2) & 0x00020000) | \
   ((c >> 10) & 0x00010000) | \
   ((d >> 13) & 0x00002000) | \
   ((d >> 4) & 0x00001000) | \
   ((d << 6) & 0x00000800) | \
   ((d >> 1) & 0x00000400) | \
   ((d >> 14) & 0x00000200) | \
   ((d >> 0) & 0x00000100) | \
   ((d >> 5) & 0x00000020) | \
   ((d >> 10) & 0x00000010) | \
   ((d >> 3) & 0x00000008) | \
   ((d >> 18) & 0x00000004) | \
   ((d >> 26) & 0x00000002) | \
   ((d >> 24) & 0x00000001))

Definition at line 101 of file des.c.

PC2_R

#define PC2_R	(		c,
			d
	)

Value:

   (((c << 15) & 0x20000000) | \
   ((c << 17) & 0x10000000) | \
   ((c << 10) & 0x08000000) | \
   ((c << 22) & 0x04000000) | \
   ((c >> 2) & 0x02000000) | \
   ((c << 1) & 0x01000000) | \
   ((c << 16) & 0x00200000) | \
   ((c << 11) & 0x00100000) | \
   ((c << 3) & 0x00080000) | \
   ((c >> 6) & 0x00040000) | \
   ((c << 15) & 0x00020000) | \
   ((c >> 4) & 0x00010000) | \
   ((d >> 2) & 0x00002000) | \
   ((d << 8) & 0x00001000) | \
   ((d >> 14) & 0x00000808) | \
   ((d >> 9) & 0x00000400) | \
   ((d >> 0) & 0x00000200) | \
   ((d << 7) & 0x00000100) | \
   ((d >> 7) & 0x00000020) | \
   ((d >> 3) & 0x00000011) | \
   ((d << 2) & 0x00000004) | \
   ((d >> 21) & 0x00000002))

Definition at line 126 of file des.c.

ROL28

#define ROL28	(		a,
			n
	)		((((a) << (n)) | ((a) >> (28 - (n)))) & 0x0FFFFFFF)

Definition at line 47 of file des.c.

ROUND

#define ROUND	(		l,
			r,
			k1,
			k2
	)

Value:

{ \
   t = r ^ k1; \
   l ^= sp2[(t >> 24) & 0x3F]; \
   l ^= sp4[(t >> 16) & 0x3F]; \
   l ^= sp6[(t >> 8) & 0x3F]; \
   l ^= sp8[t & 0x3F]; \
   t = ROR32(r, 4) ^ k2; \
   l ^= sp1[(t >> 24) & 0x3F]; \
   l ^= sp3[(t >> 16) & 0x3F]; \
   l ^= sp5[(t >> 8) & 0x3F]; \
   l ^= sp7[t & 0x3F]; \
}

Definition at line 151 of file des.c.

SWAPMOVE

#define SWAPMOVE	(		a,
			b,
			n,
			m
	)

Value:

{ \
   t = ((a >> n) ^ b) & m; \
   b ^= t; \
   a ^= t << n; \
}

Definition at line 50 of file des.c.

TRACE_LEVEL

#define TRACE_LEVEL   CRYPTO_TRACE_LEVEL

Definition at line 37 of file des.c.

Function Documentation

desDecryptBlock()

__weak_func void desDecryptBlock	(	DesContext *	context,
		const uint8_t *	input,
		uint8_t *	output
	)

Decrypt a 8-byte block using DES algorithm.

Parameters

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

Definition at line 391 of file des.c.

desDeinit()

__weak_func void desDeinit

(

DesContext *

context

)

Release DES context.

Parameters

[in]

context

Pointer to the DES context

Definition at line 429 of file des.c.

desEncryptBlock()

__weak_func void desEncryptBlock	(	DesContext *	context,
		const uint8_t *	input,
		uint8_t *	output
	)

Encrypt a 8-byte block using DES algorithm.

Parameters

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

Definition at line 351 of file des.c.

desInit()

__weak_func error_t desInit	(	DesContext *	context,
		const uint8_t *	key,
		size_t	keyLen
	)

Initialize a DES context using the supplied key.

Parameters

[in]	context	Pointer to the DES context to initialize
[in]	key	Pointer to the key
[in]	keyLen	Length of the key (must be set to 8)

Returns

Error code

Definition at line 296 of file des.c.

Variable Documentation

DES_CBC_OID

const uint8_t DES_CBC_OID[5] = {0x2B, 0x0E, 0x03, 0x02, 0x07}

Definition at line 270 of file des.c.

desCipherAlgo

const CipherAlgo desCipherAlgo

Initial value:

=
{
   "DES",
   sizeof(DesContext),
   CIPHER_ALGO_TYPE_BLOCK,
   DES_BLOCK_SIZE,
   (CipherAlgoInit) desInit,
   NULL,
   NULL,
   (CipherAlgoEncryptBlock) desEncryptBlock,
   (CipherAlgoDecryptBlock) desDecryptBlock,
   (CipherAlgoDeinit) desDeinit
}

Definition at line 273 of file des.c.