cast128.c File Reference

CAST-128 encryption algorithm. More...

#include "core/crypto.h"
#include "cipher/cast128.h"

Go to the source code of this file.

Macros
#define	TRACE_LEVEL   CRYPTO_TRACE_LEVEL
#define	S1(a, b)   s1[(a >> (8 * b)) & 0xFF]
#define	S2(a, b)   s2[(a >> (8 * b)) & 0xFF]
#define	S3(a, b)   s3[(a >> (8 * b)) & 0xFF]
#define	S4(a, b)   s4[(a >> (8 * b)) & 0xFF]
#define	S5(a, b)   s5[(a >> (8 * b)) & 0xFF]
#define	S6(a, b)   s6[(a >> (8 * b)) & 0xFF]
#define	S7(a, b)   s7[(a >> (8 * b)) & 0xFF]
#define	S8(a, b)   s8[(a >> (8 * b)) & 0xFF]
#define	F1(y, x, kr, km)
#define	F2(y, x, kr, km)
#define	F3(y, x, kr, km)

Functions
error_t	cast128Init (Cast128Context *context, const uint8_t *key, size_t keyLen)
	Key expansion. More...
void	cast128EncryptBlock (Cast128Context *context, const uint8_t *input, uint8_t *output)
	Encrypt a 8-byte block using CAST-128 algorithm. More...
void	cast128DecryptBlock (Cast128Context *context, const uint8_t *input, uint8_t *output)
	Decrypt a 8-byte block using CAST-128 algorithm. More...
void	cast128Deinit (Cast128Context *context)
	Release CAST-128 context. More...

Variables
const CipherAlgo	cast128CipherAlgo

Detailed Description

CAST-128 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.

Author

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

Version

2.4.4

Definition in file cast128.c.

Macro Definition Documentation

F1

#define F1	(		y,
			x,
			kr,
			km
	)

Value:

{ \
   uint32_t t; \
   t = km + x; \
   t = ROL32(t, kr); \
   y ^= ((S1(t, 3) ^ S2(t, 2)) - S3(t, 1)) + S4(t, 0); \
}

Definition at line 52 of file cast128.c.

F2

#define F2	(		y,
			x,
			kr,
			km
	)

Value:

{ \
   uint32_t t; \
   t = km ^ x; \
   t = ROL32(t, kr); \
   y ^= ((S1(t, 3) - S2(t, 2)) + S3(t, 1)) ^ S4(t, 0); \
}

Definition at line 61 of file cast128.c.

F3

#define F3	(		y,
			x,
			kr,
			km
	)

Value:

{ \
   uint32_t t; \
   t = km - x; \
   t = ROL32(t, kr); \
   y ^= ((S1(t, 3) + S2(t, 2)) ^ S3(t, 1)) - S4(t, 0); \
}

Definition at line 70 of file cast128.c.

S1

#define S1	(		a,
			b
	)		s1[(a >> (8 * b)) & 0xFF]

Definition at line 42 of file cast128.c.

S2

#define S2	(		a,
			b
	)		s2[(a >> (8 * b)) & 0xFF]

Definition at line 43 of file cast128.c.

S3

#define S3	(		a,
			b
	)		s3[(a >> (8 * b)) & 0xFF]

Definition at line 44 of file cast128.c.

S4

#define S4	(		a,
			b
	)		s4[(a >> (8 * b)) & 0xFF]

Definition at line 45 of file cast128.c.

S5

#define S5	(		a,
			b
	)		s5[(a >> (8 * b)) & 0xFF]

Definition at line 46 of file cast128.c.

S6

#define S6	(		a,
			b
	)		s6[(a >> (8 * b)) & 0xFF]

Definition at line 47 of file cast128.c.

S7

#define S7	(		a,
			b
	)		s7[(a >> (8 * b)) & 0xFF]

Definition at line 48 of file cast128.c.

S8

#define S8	(		a,
			b
	)		s8[(a >> (8 * b)) & 0xFF]

Definition at line 49 of file cast128.c.

TRACE_LEVEL

#define TRACE_LEVEL   CRYPTO_TRACE_LEVEL

Definition at line 32 of file cast128.c.

Function Documentation

cast128DecryptBlock()

void cast128DecryptBlock	(	Cast128Context *	context,
		const uint8_t *	input,
		uint8_t *	output
	)

Decrypt a 8-byte block using CAST-128 algorithm.

Parameters

[in]	context	Pointer to the CAST-128 context
[in]	input	Ciphertext block to decrypt
[out]	output	Plaintext block resulting from decryption

Definition at line 551 of file cast128.c.

cast128Deinit()

void cast128Deinit

(

Cast128Context *

context

)

Release CAST-128 context.

Parameters

[in]

context

Pointer to the CAST-128 context

Definition at line 595 of file cast128.c.

cast128EncryptBlock()

void cast128EncryptBlock	(	Cast128Context *	context,
		const uint8_t *	input,
		uint8_t *	output
	)

Encrypt a 8-byte block using CAST-128 algorithm.

Parameters

[in]	context	Pointer to the CAST-128 context
[in]	input	Plaintext block to encrypt
[out]	output	Ciphertext block resulting from encryption

Definition at line 505 of file cast128.c.

cast128Init()

error_t cast128Init	(	Cast128Context *	context,
		const uint8_t *	key,
		size_t	keyLen
	)

Key expansion.

Parameters

[in]	context	Pointer to the CAST-128 context to initialize
[in]	key	Pointer to the key
[in]	keyLen	Length of the key

Returns

Error code

Definition at line 398 of file cast128.c.

Variable Documentation

cast128CipherAlgo

const CipherAlgo cast128CipherAlgo

Initial value:

=
{
   "CAST-128",
   sizeof(Cast128Context),
   CIPHER_ALGO_TYPE_BLOCK,
   CAST128_BLOCK_SIZE,
   (CipherAlgoInit) cast128Init,
   NULL,
   NULL,
   (CipherAlgoEncryptBlock) cast128EncryptBlock,
   (CipherAlgoDecryptBlock) cast128DecryptBlock,
   (CipherAlgoDeinit) cast128Deinit
}

Definition at line 375 of file cast128.c.