[linux.git] / crypto / cast6_generic.c

// SPDX-License-Identifier: GPL-2.0-or-later
/* Kernel cryptographic api.
 * cast6.c - Cast6 cipher algorithm [rfc2612].
 *
 * CAST-256 (*cast6*) is a DES like Substitution-Permutation Network (SPN)
 * cryptosystem built upon the CAST-128 (*cast5*) [rfc2144] encryption
 * algorithm.
 *
 * Copyright (C) 2003 Kartikey Mahendra Bhatt <[email protected]>.
 */


#include <asm/unaligned.h>
#include <linux/init.h>
#include <linux/crypto.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>
#include <crypto/cast6.h>

#define s1 cast_s1
#define s2 cast_s2
#define s3 cast_s3
#define s4 cast_s4

#define F1(D, r, m)  ((I = ((m) + (D))), (I = rol32(I, (r))),   \
	(((s1[I >> 24] ^ s2[(I>>16)&0xff]) - s3[(I>>8)&0xff]) + s4[I&0xff]))
#define F2(D, r, m)  ((I = ((m) ^ (D))), (I = rol32(I, (r))),   \
	(((s1[I >> 24] - s2[(I>>16)&0xff]) + s3[(I>>8)&0xff]) ^ s4[I&0xff]))
#define F3(D, r, m)  ((I = ((m) - (D))), (I = rol32(I, (r))),   \
	(((s1[I >> 24] + s2[(I>>16)&0xff]) ^ s3[(I>>8)&0xff]) - s4[I&0xff]))

static const u32 Tm[24][8] = {
	{ 0x5a827999, 0xc95c653a, 0x383650db, 0xa7103c7c, 0x15ea281d,
		0x84c413be, 0xf39dff5f, 0x6277eb00 } ,
	{ 0xd151d6a1, 0x402bc242, 0xaf05ade3, 0x1ddf9984, 0x8cb98525,
		0xfb9370c6, 0x6a6d5c67, 0xd9474808 } ,
	{ 0x482133a9, 0xb6fb1f4a, 0x25d50aeb, 0x94aef68c, 0x0388e22d,
		0x7262cdce, 0xe13cb96f, 0x5016a510 } ,
	{ 0xbef090b1, 0x2dca7c52, 0x9ca467f3, 0x0b7e5394, 0x7a583f35,
		0xe9322ad6, 0x580c1677, 0xc6e60218 } ,
	{ 0x35bfedb9, 0xa499d95a, 0x1373c4fb, 0x824db09c, 0xf1279c3d,
		0x600187de, 0xcedb737f, 0x3db55f20 } ,
	{ 0xac8f4ac1, 0x1b693662, 0x8a432203, 0xf91d0da4, 0x67f6f945,
		0xd6d0e4e6, 0x45aad087, 0xb484bc28 } ,
	{ 0x235ea7c9, 0x9238936a, 0x01127f0b, 0x6fec6aac, 0xdec6564d,
		0x4da041ee, 0xbc7a2d8f, 0x2b541930 } ,
	{ 0x9a2e04d1, 0x0907f072, 0x77e1dc13, 0xe6bbc7b4, 0x5595b355,
		0xc46f9ef6, 0x33498a97, 0xa2237638 } ,
	{ 0x10fd61d9, 0x7fd74d7a, 0xeeb1391b, 0x5d8b24bc, 0xcc65105d,
		0x3b3efbfe, 0xaa18e79f, 0x18f2d340 } ,
	{ 0x87ccbee1, 0xf6a6aa82, 0x65809623, 0xd45a81c4, 0x43346d65,
		0xb20e5906, 0x20e844a7, 0x8fc23048 } ,
	{ 0xfe9c1be9, 0x6d76078a, 0xdc4ff32b, 0x4b29decc, 0xba03ca6d,
		0x28ddb60e, 0x97b7a1af, 0x06918d50 } ,
	{ 0x756b78f1, 0xe4456492, 0x531f5033, 0xc1f93bd4, 0x30d32775,
		0x9fad1316, 0x0e86feb7, 0x7d60ea58 } ,
	{ 0xec3ad5f9, 0x5b14c19a, 0xc9eead3b, 0x38c898dc, 0xa7a2847d,
		0x167c701e, 0x85565bbf, 0xf4304760 } ,
	{ 0x630a3301, 0xd1e41ea2, 0x40be0a43, 0xaf97f5e4, 0x1e71e185,
		0x8d4bcd26, 0xfc25b8c7, 0x6affa468 } ,
	{ 0xd9d99009, 0x48b37baa, 0xb78d674b, 0x266752ec, 0x95413e8d,
		0x041b2a2e, 0x72f515cf, 0xe1cf0170 } ,
	{ 0x50a8ed11, 0xbf82d8b2, 0x2e5cc453, 0x9d36aff4, 0x0c109b95,
		0x7aea8736, 0xe9c472d7, 0x589e5e78 } ,
	{ 0xc7784a19, 0x365235ba, 0xa52c215b, 0x14060cfc, 0x82dff89d,
		0xf1b9e43e, 0x6093cfdf, 0xcf6dbb80 } ,
	{ 0x3e47a721, 0xad2192c2, 0x1bfb7e63, 0x8ad56a04, 0xf9af55a5,
		0x68894146, 0xd7632ce7, 0x463d1888 } ,
	{ 0xb5170429, 0x23f0efca, 0x92cadb6b, 0x01a4c70c, 0x707eb2ad,
		0xdf589e4e, 0x4e3289ef, 0xbd0c7590 } ,
	{ 0x2be66131, 0x9ac04cd2, 0x099a3873, 0x78742414, 0xe74e0fb5,
		0x5627fb56, 0xc501e6f7, 0x33dbd298 } ,
	{ 0xa2b5be39, 0x118fa9da, 0x8069957b, 0xef43811c, 0x5e1d6cbd,
		0xccf7585e, 0x3bd143ff, 0xaaab2fa0 } ,
	{ 0x19851b41, 0x885f06e2, 0xf738f283, 0x6612de24, 0xd4ecc9c5,
		0x43c6b566, 0xb2a0a107, 0x217a8ca8 } ,
	{ 0x90547849, 0xff2e63ea, 0x6e084f8b, 0xdce23b2c, 0x4bbc26cd,
		0xba96126e, 0x296ffe0f, 0x9849e9b0 } ,
	{ 0x0723d551, 0x75fdc0f2, 0xe4d7ac93, 0x53b19834, 0xc28b83d5,
		0x31656f76, 0xa03f5b17, 0x0f1946b8 }
};

static const u8 Tr[4][8] = {
	{ 0x13, 0x04, 0x15, 0x06, 0x17, 0x08, 0x19, 0x0a } ,
	{ 0x1b, 0x0c, 0x1d, 0x0e, 0x1f, 0x10, 0x01, 0x12 } ,
	{ 0x03, 0x14, 0x05, 0x16, 0x07, 0x18, 0x09, 0x1a } ,
	{ 0x0b, 0x1c, 0x0d, 0x1e, 0x0f, 0x00, 0x11, 0x02 }
};

/* forward octave */
static inline void W(u32 *key, unsigned int i)
{
	u32 I;
	key[6] ^= F1(key[7], Tr[i % 4][0], Tm[i][0]);
	key[5] ^= F2(key[6], Tr[i % 4][1], Tm[i][1]);
	key[4] ^= F3(key[5], Tr[i % 4][2], Tm[i][2]);
	key[3] ^= F1(key[4], Tr[i % 4][3], Tm[i][3]);
	key[2] ^= F2(key[3], Tr[i % 4][4], Tm[i][4]);
	key[1] ^= F3(key[2], Tr[i % 4][5], Tm[i][5]);
	key[0] ^= F1(key[1], Tr[i % 4][6], Tm[i][6]);
	key[7] ^= F2(key[0], Tr[i % 4][7], Tm[i][7]);
}

int __cast6_setkey(struct cast6_ctx *c, const u8 *in_key, unsigned int key_len)
{
	int i;
	u32 key[8];
	__be32 p_key[8]; /* padded key */

	if (key_len % 4 != 0)
		return -EINVAL;

	memset(p_key, 0, 32);
	memcpy(p_key, in_key, key_len);

	key[0] = be32_to_cpu(p_key[0]);		/* A */
	key[1] = be32_to_cpu(p_key[1]);		/* B */
	key[2] = be32_to_cpu(p_key[2]);		/* C */
	key[3] = be32_to_cpu(p_key[3]);		/* D */
	key[4] = be32_to_cpu(p_key[4]);		/* E */
	key[5] = be32_to_cpu(p_key[5]);		/* F */
	key[6] = be32_to_cpu(p_key[6]);		/* G */
	key[7] = be32_to_cpu(p_key[7]);		/* H */

	for (i = 0; i < 12; i++) {
		W(key, 2 * i);
		W(key, 2 * i + 1);

		c->Kr[i][0] = key[0] & 0x1f;
		c->Kr[i][1] = key[2] & 0x1f;
		c->Kr[i][2] = key[4] & 0x1f;
		c->Kr[i][3] = key[6] & 0x1f;

		c->Km[i][0] = key[7];
		c->Km[i][1] = key[5];
		c->Km[i][2] = key[3];
		c->Km[i][3] = key[1];
	}

	return 0;
}
EXPORT_SYMBOL_GPL(__cast6_setkey);

int cast6_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
{
	return __cast6_setkey(crypto_tfm_ctx(tfm), key, keylen);
}
EXPORT_SYMBOL_GPL(cast6_setkey);

/*forward quad round*/
static inline void Q(u32 *block, const u8 *Kr, const u32 *Km)
{
	u32 I;
	block[2] ^= F1(block[3], Kr[0], Km[0]);
	block[1] ^= F2(block[2], Kr[1], Km[1]);
	block[0] ^= F3(block[1], Kr[2], Km[2]);
	block[3] ^= F1(block[0], Kr[3], Km[3]);
}

/*reverse quad round*/
static inline void QBAR(u32 *block, const u8 *Kr, const u32 *Km)
{
	u32 I;
	block[3] ^= F1(block[0], Kr[3], Km[3]);
	block[0] ^= F3(block[1], Kr[2], Km[2]);
	block[1] ^= F2(block[2], Kr[1], Km[1]);
	block[2] ^= F1(block[3], Kr[0], Km[0]);
}

void __cast6_encrypt(const void *ctx, u8 *outbuf, const u8 *inbuf)
{
	const struct cast6_ctx *c = ctx;
	u32 block[4];
	const u32 *Km;
	const u8 *Kr;

	block[0] = get_unaligned_be32(inbuf);
	block[1] = get_unaligned_be32(inbuf + 4);
	block[2] = get_unaligned_be32(inbuf + 8);
	block[3] = get_unaligned_be32(inbuf + 12);

	Km = c->Km[0]; Kr = c->Kr[0]; Q(block, Kr, Km);
	Km = c->Km[1]; Kr = c->Kr[1]; Q(block, Kr, Km);
	Km = c->Km[2]; Kr = c->Kr[2]; Q(block, Kr, Km);
	Km = c->Km[3]; Kr = c->Kr[3]; Q(block, Kr, Km);
	Km = c->Km[4]; Kr = c->Kr[4]; Q(block, Kr, Km);
	Km = c->Km[5]; Kr = c->Kr[5]; Q(block, Kr, Km);
	Km = c->Km[6]; Kr = c->Kr[6]; QBAR(block, Kr, Km);
	Km = c->Km[7]; Kr = c->Kr[7]; QBAR(block, Kr, Km);
	Km = c->Km[8]; Kr = c->Kr[8]; QBAR(block, Kr, Km);
	Km = c->Km[9]; Kr = c->Kr[9]; QBAR(block, Kr, Km);
	Km = c->Km[10]; Kr = c->Kr[10]; QBAR(block, Kr, Km);
	Km = c->Km[11]; Kr = c->Kr[11]; QBAR(block, Kr, Km);

	put_unaligned_be32(block[0], outbuf);
	put_unaligned_be32(block[1], outbuf + 4);
	put_unaligned_be32(block[2], outbuf + 8);
	put_unaligned_be32(block[3], outbuf + 12);
}
EXPORT_SYMBOL_GPL(__cast6_encrypt);

static void cast6_encrypt(struct crypto_tfm *tfm, u8 *outbuf, const u8 *inbuf)
{
	__cast6_encrypt(crypto_tfm_ctx(tfm), outbuf, inbuf);
}

void __cast6_decrypt(const void *ctx, u8 *outbuf, const u8 *inbuf)
{
	const struct cast6_ctx *c = ctx;
	u32 block[4];
	const u32 *Km;
	const u8 *Kr;

	block[0] = get_unaligned_be32(inbuf);
	block[1] = get_unaligned_be32(inbuf + 4);
	block[2] = get_unaligned_be32(inbuf + 8);
	block[3] = get_unaligned_be32(inbuf + 12);

	Km = c->Km[11]; Kr = c->Kr[11]; Q(block, Kr, Km);
	Km = c->Km[10]; Kr = c->Kr[10]; Q(block, Kr, Km);
	Km = c->Km[9]; Kr = c->Kr[9]; Q(block, Kr, Km);
	Km = c->Km[8]; Kr = c->Kr[8]; Q(block, Kr, Km);
	Km = c->Km[7]; Kr = c->Kr[7]; Q(block, Kr, Km);
	Km = c->Km[6]; Kr = c->Kr[6]; Q(block, Kr, Km);
	Km = c->Km[5]; Kr = c->Kr[5]; QBAR(block, Kr, Km);
	Km = c->Km[4]; Kr = c->Kr[4]; QBAR(block, Kr, Km);
	Km = c->Km[3]; Kr = c->Kr[3]; QBAR(block, Kr, Km);
	Km = c->Km[2]; Kr = c->Kr[2]; QBAR(block, Kr, Km);
	Km = c->Km[1]; Kr = c->Kr[1]; QBAR(block, Kr, Km);
	Km = c->Km[0]; Kr = c->Kr[0]; QBAR(block, Kr, Km);

	put_unaligned_be32(block[0], outbuf);
	put_unaligned_be32(block[1], outbuf + 4);
	put_unaligned_be32(block[2], outbuf + 8);
	put_unaligned_be32(block[3], outbuf + 12);
}
EXPORT_SYMBOL_GPL(__cast6_decrypt);

static void cast6_decrypt(struct crypto_tfm *tfm, u8 *outbuf, const u8 *inbuf)
{
	__cast6_decrypt(crypto_tfm_ctx(tfm), outbuf, inbuf);
}

static struct crypto_alg alg = {
	.cra_name = "cast6",
	.cra_driver_name = "cast6-generic",
	.cra_priority = 100,
	.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
	.cra_blocksize = CAST6_BLOCK_SIZE,
	.cra_ctxsize = sizeof(struct cast6_ctx),
	.cra_module = THIS_MODULE,
	.cra_u = {
		  .cipher = {
			     .cia_min_keysize = CAST6_MIN_KEY_SIZE,
			     .cia_max_keysize = CAST6_MAX_KEY_SIZE,
			     .cia_setkey = cast6_setkey,
			     .cia_encrypt = cast6_encrypt,
			     .cia_decrypt = cast6_decrypt}
		  }
};

static int __init cast6_mod_init(void)
{
	return crypto_register_alg(&alg);
}

static void __exit cast6_mod_fini(void)
{
	crypto_unregister_alg(&alg);
}

subsys_initcall(cast6_mod_init);
module_exit(cast6_mod_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Cast6 Cipher Algorithm");
MODULE_ALIAS_CRYPTO("cast6");
MODULE_ALIAS_CRYPTO("cast6-generic");
Commit	Line	Data
1cc6582e	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/* Kernel cryptographic api.
	3	* cast6.c - Cast6 cipher algorithm [rfc2612].
	4	*
	5	* CAST-256 (cast6) is a DES like Substitution-Permutation Network (SPN)
	6	* cryptosystem built upon the CAST-128 (cast5) [rfc2144] encryption
	7	* algorithm.
	8	*
	9	* Copyright (C) 2003 Kartikey Mahendra Bhatt <[email protected]>.
1da177e4 LT	10	*/
	11
	12
80879dd9	13	#include <asm/unaligned.h>
1da177e4 LT	14	#include <linux/init.h>
	15	#include <linux/crypto.h>
	16	#include <linux/module.h>
	17	#include <linux/errno.h>
	18	#include <linux/string.h>
06ace7a9	19	#include <linux/types.h>
2b49b906	20	#include <crypto/cast6.h>
1da177e4	21
044ab525 JK	22	#define s1 cast_s1
	23	#define s2 cast_s2
	24	#define s3 cast_s3
	25	#define s4 cast_s4
1da177e4	26
87c3be87	27	#define F1(D, r, m) ((I = ((m) + (D))), (I = rol32(I, (r))), \
2b49b906	28	(((s1[I >> 24] ^ s2[(I>>16)&0xff]) - s3[(I>>8)&0xff]) + s4[I&0xff]))
87c3be87	29	#define F2(D, r, m) ((I = ((m) ^ (D))), (I = rol32(I, (r))), \
2b49b906	30	(((s1[I >> 24] - s2[(I>>16)&0xff]) + s3[(I>>8)&0xff]) ^ s4[I&0xff]))
87c3be87	31	#define F3(D, r, m) ((I = ((m) - (D))), (I = rol32(I, (r))), \
2b49b906	32	(((s1[I >> 24] + s2[(I>>16)&0xff]) ^ s3[(I>>8)&0xff]) - s4[I&0xff]))
1da177e4	33
1da177e4 LT	34	static const u32 Tm[24][8] = {
1da177e4 LT	35	{ 0x5a827999, 0xc95c653a, 0x383650db, 0xa7103c7c, 0x15ea281d,
87c3be87	36	0x84c413be, 0xf39dff5f, 0x6277eb00 } ,
1da177e4 LT	37	{ 0xd151d6a1, 0x402bc242, 0xaf05ade3, 0x1ddf9984, 0x8cb98525,
	38	0xfb9370c6, 0x6a6d5c67, 0xd9474808 } ,
	39	{ 0x482133a9, 0xb6fb1f4a, 0x25d50aeb, 0x94aef68c, 0x0388e22d,
	40	0x7262cdce, 0xe13cb96f, 0x5016a510 } ,
	41	{ 0xbef090b1, 0x2dca7c52, 0x9ca467f3, 0x0b7e5394, 0x7a583f35,
	42	0xe9322ad6, 0x580c1677, 0xc6e60218 } ,
	43	{ 0x35bfedb9, 0xa499d95a, 0x1373c4fb, 0x824db09c, 0xf1279c3d,
	44	0x600187de, 0xcedb737f, 0x3db55f20 } ,
	45	{ 0xac8f4ac1, 0x1b693662, 0x8a432203, 0xf91d0da4, 0x67f6f945,
	46	0xd6d0e4e6, 0x45aad087, 0xb484bc28 } ,
	47	{ 0x235ea7c9, 0x9238936a, 0x01127f0b, 0x6fec6aac, 0xdec6564d,
	48	0x4da041ee, 0xbc7a2d8f, 0x2b541930 } ,
	49	{ 0x9a2e04d1, 0x0907f072, 0x77e1dc13, 0xe6bbc7b4, 0x5595b355,
	50	0xc46f9ef6, 0x33498a97, 0xa2237638 } ,
	51	{ 0x10fd61d9, 0x7fd74d7a, 0xeeb1391b, 0x5d8b24bc, 0xcc65105d,
	52	0x3b3efbfe, 0xaa18e79f, 0x18f2d340 } ,
	53	{ 0x87ccbee1, 0xf6a6aa82, 0x65809623, 0xd45a81c4, 0x43346d65,
	54	0xb20e5906, 0x20e844a7, 0x8fc23048 } ,
	55	{ 0xfe9c1be9, 0x6d76078a, 0xdc4ff32b, 0x4b29decc, 0xba03ca6d,
	56	0x28ddb60e, 0x97b7a1af, 0x06918d50 } ,
	57	{ 0x756b78f1, 0xe4456492, 0x531f5033, 0xc1f93bd4, 0x30d32775,
	58	0x9fad1316, 0x0e86feb7, 0x7d60ea58 } ,
	59	{ 0xec3ad5f9, 0x5b14c19a, 0xc9eead3b, 0x38c898dc, 0xa7a2847d,
	60	0x167c701e, 0x85565bbf, 0xf4304760 } ,
	61	{ 0x630a3301, 0xd1e41ea2, 0x40be0a43, 0xaf97f5e4, 0x1e71e185,
	62	0x8d4bcd26, 0xfc25b8c7, 0x6affa468 } ,
	63	{ 0xd9d99009, 0x48b37baa, 0xb78d674b, 0x266752ec, 0x95413e8d,
	64	0x041b2a2e, 0x72f515cf, 0xe1cf0170 } ,
	65	{ 0x50a8ed11, 0xbf82d8b2, 0x2e5cc453, 0x9d36aff4, 0x0c109b95,
	66	0x7aea8736, 0xe9c472d7, 0x589e5e78 } ,
	67	{ 0xc7784a19, 0x365235ba, 0xa52c215b, 0x14060cfc, 0x82dff89d,
	68	0xf1b9e43e, 0x6093cfdf, 0xcf6dbb80 } ,
	69	{ 0x3e47a721, 0xad2192c2, 0x1bfb7e63, 0x8ad56a04, 0xf9af55a5,
	70	0x68894146, 0xd7632ce7, 0x463d1888 } ,
	71	{ 0xb5170429, 0x23f0efca, 0x92cadb6b, 0x01a4c70c, 0x707eb2ad,
	72	0xdf589e4e, 0x4e3289ef, 0xbd0c7590 } ,
	73	{ 0x2be66131, 0x9ac04cd2, 0x099a3873, 0x78742414, 0xe74e0fb5,
	74	0x5627fb56, 0xc501e6f7, 0x33dbd298 } ,
	75	{ 0xa2b5be39, 0x118fa9da, 0x8069957b, 0xef43811c, 0x5e1d6cbd,
	76	0xccf7585e, 0x3bd143ff, 0xaaab2fa0 } ,
	77	{ 0x19851b41, 0x885f06e2, 0xf738f283, 0x6612de24, 0xd4ecc9c5,
	78	0x43c6b566, 0xb2a0a107, 0x217a8ca8 } ,
	79	{ 0x90547849, 0xff2e63ea, 0x6e084f8b, 0xdce23b2c, 0x4bbc26cd,
	80	0xba96126e, 0x296ffe0f, 0x9849e9b0 } ,
	81	{ 0x0723d551, 0x75fdc0f2, 0xe4d7ac93, 0x53b19834, 0xc28b83d5,
	82	0x31656f76, 0xa03f5b17, 0x0f1946b8 }
	83	};
	84
	85	static const u8 Tr[4][8] = {
	86	{ 0x13, 0x04, 0x15, 0x06, 0x17, 0x08, 0x19, 0x0a } ,
	87	{ 0x1b, 0x0c, 0x1d, 0x0e, 0x1f, 0x10, 0x01, 0x12 } ,
	88	{ 0x03, 0x14, 0x05, 0x16, 0x07, 0x18, 0x09, 0x1a } ,
	89	{ 0x0b, 0x1c, 0x0d, 0x1e, 0x0f, 0x00, 0x11, 0x02 }
	90	};
	91
	92	/* forward octave */
312639bb	93	static inline void W(u32 *key, unsigned int i)
87c3be87	94	{
1da177e4 LT	95	u32 I;
	96	key[6] ^= F1(key[7], Tr[i % 4][0], Tm[i][0]);
	97	key[5] ^= F2(key[6], Tr[i % 4][1], Tm[i][1]);
	98	key[4] ^= F3(key[5], Tr[i % 4][2], Tm[i][2]);
	99	key[3] ^= F1(key[4], Tr[i % 4][3], Tm[i][3]);
	100	key[2] ^= F2(key[3], Tr[i % 4][4], Tm[i][4]);
	101	key[1] ^= F3(key[2], Tr[i % 4][5], Tm[i][5]);
87c3be87	102	key[0] ^= F1(key[1], Tr[i % 4][6], Tm[i][6]);
1da177e4 LT	103	key[7] ^= F2(key[0], Tr[i % 4][7], Tm[i][7]);
	104	}
	105
674f368a	106	int __cast6_setkey(struct cast6_ctx c, const u8 in_key, unsigned int key_len)
1da177e4 LT	107	{
	108	int i;
	109	u32 key[8];
06ace7a9	110	__be32 p_key[8]; /* padded key */
1da177e4	111
674f368a	112	if (key_len % 4 != 0)
1da177e4	113	return -EINVAL;
87c3be87 RH	114
	115	memset(p_key, 0, 32);
	116	memcpy(p_key, in_key, key_len);
1da177e4	117
06ace7a9 HX	118	key[0] = be32_to_cpu(p_key[0]); /* A */
	119	key[1] = be32_to_cpu(p_key[1]); /* B */
	120	key[2] = be32_to_cpu(p_key[2]); /* C */
	121	key[3] = be32_to_cpu(p_key[3]); /* D */
	122	key[4] = be32_to_cpu(p_key[4]); /* E */
	123	key[5] = be32_to_cpu(p_key[5]); /* F */
	124	key[6] = be32_to_cpu(p_key[6]); /* G */
	125	key[7] = be32_to_cpu(p_key[7]); /* H */
1da177e4 LT	126
1da177e4 LT	127	for (i = 0; i < 12; i++) {
87c3be87 RH	128	W(key, 2 * i);
	129	W(key, 2 * i + 1);
	130
1da177e4 LT	131	c->Kr[i][0] = key[0] & 0x1f;
	132	c->Kr[i][1] = key[2] & 0x1f;
	133	c->Kr[i][2] = key[4] & 0x1f;
	134	c->Kr[i][3] = key[6] & 0x1f;
87c3be87	135
1da177e4 LT	136	c->Km[i][0] = key[7];
	137	c->Km[i][1] = key[5];
	138	c->Km[i][2] = key[3];
	139	c->Km[i][3] = key[1];
	140	}
	141
	142	return 0;
	143	}
2b49b906 JG	144	EXPORT_SYMBOL_GPL(__cast6_setkey);
	145
	146	int cast6_setkey(struct crypto_tfm tfm, const u8 key, unsigned int keylen)
	147	{
674f368a	148	return __cast6_setkey(crypto_tfm_ctx(tfm), key, keylen);
2b49b906 JG	149	}
2b49b906 JG	150	EXPORT_SYMBOL_GPL(cast6_setkey);
1da177e4 LT	151
1da177e4 LT	152	/forward quad round/
9c1e8836	153	static inline void Q(u32 block, const u8 Kr, const u32 *Km)
87c3be87	154	{
1da177e4 LT	155	u32 I;
	156	block[2] ^= F1(block[3], Kr[0], Km[0]);
	157	block[1] ^= F2(block[2], Kr[1], Km[1]);
	158	block[0] ^= F3(block[1], Kr[2], Km[2]);
87c3be87	159	block[3] ^= F1(block[0], Kr[3], Km[3]);
1da177e4 LT	160	}
	161
	162	/reverse quad round/
9c1e8836	163	static inline void QBAR(u32 block, const u8 Kr, const u32 *Km)
87c3be87	164	{
1da177e4	165	u32 I;
87c3be87 RH	166	block[3] ^= F1(block[0], Kr[3], Km[3]);
	167	block[0] ^= F3(block[1], Kr[2], Km[2]);
	168	block[1] ^= F2(block[2], Kr[1], Km[1]);
	169	block[2] ^= F1(block[3], Kr[0], Km[0]);
1da177e4 LT	170	}
1da177e4 LT	171
9c1e8836	172	void __cast6_encrypt(const void ctx, u8 outbuf, const u8 *inbuf)
6c2bb98b	173	{
9c1e8836	174	const struct cast6_ctx *c = ctx;
1da177e4	175	u32 block[4];
9c1e8836 KC	176	const u32 *Km;
9c1e8836 KC	177	const u8 *Kr;
1da177e4	178
80879dd9 AB	179	block[0] = get_unaligned_be32(inbuf);
	180	block[1] = get_unaligned_be32(inbuf + 4);
	181	block[2] = get_unaligned_be32(inbuf + 8);
	182	block[3] = get_unaligned_be32(inbuf + 12);
1da177e4	183
87c3be87 RH	184	Km = c->Km[0]; Kr = c->Kr[0]; Q(block, Kr, Km);
	185	Km = c->Km[1]; Kr = c->Kr[1]; Q(block, Kr, Km);
	186	Km = c->Km[2]; Kr = c->Kr[2]; Q(block, Kr, Km);
	187	Km = c->Km[3]; Kr = c->Kr[3]; Q(block, Kr, Km);
	188	Km = c->Km[4]; Kr = c->Kr[4]; Q(block, Kr, Km);
	189	Km = c->Km[5]; Kr = c->Kr[5]; Q(block, Kr, Km);
	190	Km = c->Km[6]; Kr = c->Kr[6]; QBAR(block, Kr, Km);
	191	Km = c->Km[7]; Kr = c->Kr[7]; QBAR(block, Kr, Km);
	192	Km = c->Km[8]; Kr = c->Kr[8]; QBAR(block, Kr, Km);
	193	Km = c->Km[9]; Kr = c->Kr[9]; QBAR(block, Kr, Km);
	194	Km = c->Km[10]; Kr = c->Kr[10]; QBAR(block, Kr, Km);
	195	Km = c->Km[11]; Kr = c->Kr[11]; QBAR(block, Kr, Km);
06ace7a9	196
80879dd9 AB	197	put_unaligned_be32(block[0], outbuf);
	198	put_unaligned_be32(block[1], outbuf + 4);
	199	put_unaligned_be32(block[2], outbuf + 8);
	200	put_unaligned_be32(block[3], outbuf + 12);
87c3be87	201	}
2b49b906	202	EXPORT_SYMBOL_GPL(__cast6_encrypt);
1da177e4	203
2b49b906 JG	204	static void cast6_encrypt(struct crypto_tfm tfm, u8 outbuf, const u8 *inbuf)
	205	{
	206	__cast6_encrypt(crypto_tfm_ctx(tfm), outbuf, inbuf);
	207	}
	208
9c1e8836	209	void __cast6_decrypt(const void ctx, u8 outbuf, const u8 *inbuf)
87c3be87	210	{
9c1e8836	211	const struct cast6_ctx *c = ctx;
1da177e4	212	u32 block[4];
9c1e8836 KC	213	const u32 *Km;
9c1e8836 KC	214	const u8 *Kr;
1da177e4	215
80879dd9 AB	216	block[0] = get_unaligned_be32(inbuf);
	217	block[1] = get_unaligned_be32(inbuf + 4);
	218	block[2] = get_unaligned_be32(inbuf + 8);
	219	block[3] = get_unaligned_be32(inbuf + 12);
1da177e4	220
87c3be87 RH	221	Km = c->Km[11]; Kr = c->Kr[11]; Q(block, Kr, Km);
	222	Km = c->Km[10]; Kr = c->Kr[10]; Q(block, Kr, Km);
	223	Km = c->Km[9]; Kr = c->Kr[9]; Q(block, Kr, Km);
	224	Km = c->Km[8]; Kr = c->Kr[8]; Q(block, Kr, Km);
	225	Km = c->Km[7]; Kr = c->Kr[7]; Q(block, Kr, Km);
	226	Km = c->Km[6]; Kr = c->Kr[6]; Q(block, Kr, Km);
	227	Km = c->Km[5]; Kr = c->Kr[5]; QBAR(block, Kr, Km);
	228	Km = c->Km[4]; Kr = c->Kr[4]; QBAR(block, Kr, Km);
	229	Km = c->Km[3]; Kr = c->Kr[3]; QBAR(block, Kr, Km);
	230	Km = c->Km[2]; Kr = c->Kr[2]; QBAR(block, Kr, Km);
	231	Km = c->Km[1]; Kr = c->Kr[1]; QBAR(block, Kr, Km);
	232	Km = c->Km[0]; Kr = c->Kr[0]; QBAR(block, Kr, Km);
	233
80879dd9 AB	234	put_unaligned_be32(block[0], outbuf);
	235	put_unaligned_be32(block[1], outbuf + 4);
	236	put_unaligned_be32(block[2], outbuf + 8);
	237	put_unaligned_be32(block[3], outbuf + 12);
87c3be87	238	}
2b49b906 JG	239	EXPORT_SYMBOL_GPL(__cast6_decrypt);
	240
	241	static void cast6_decrypt(struct crypto_tfm tfm, u8 outbuf, const u8 *inbuf)
	242	{
	243	__cast6_decrypt(crypto_tfm_ctx(tfm), outbuf, inbuf);
	244	}
1da177e4 LT	245
	246	static struct crypto_alg alg = {
	247	.cra_name = "cast6",
2b49b906 JG	248	.cra_driver_name = "cast6-generic",
2b49b906 JG	249	.cra_priority = 100,
1da177e4 LT	250	.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
	251	.cra_blocksize = CAST6_BLOCK_SIZE,
	252	.cra_ctxsize = sizeof(struct cast6_ctx),
	253	.cra_module = THIS_MODULE,
1da177e4 LT	254	.cra_u = {
	255	.cipher = {
	256	.cia_min_keysize = CAST6_MIN_KEY_SIZE,
	257	.cia_max_keysize = CAST6_MAX_KEY_SIZE,
	258	.cia_setkey = cast6_setkey,
	259	.cia_encrypt = cast6_encrypt,
	260	.cia_decrypt = cast6_decrypt}
	261	}
	262	};
	263
3af5b90b	264	static int __init cast6_mod_init(void)
1da177e4 LT	265	{
	266	return crypto_register_alg(&alg);
	267	}
	268
3af5b90b	269	static void __exit cast6_mod_fini(void)
1da177e4 LT	270	{
	271	crypto_unregister_alg(&alg);
	272	}
	273
c4741b23	274	subsys_initcall(cast6_mod_init);
3af5b90b	275	module_exit(cast6_mod_fini);
1da177e4 LT	276
	277	MODULE_LICENSE("GPL");
	278	MODULE_DESCRIPTION("Cast6 Cipher Algorithm");
5d26a105	279	MODULE_ALIAS_CRYPTO("cast6");
3e14dcf7	280	MODULE_ALIAS_CRYPTO("cast6-generic");