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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Glue Code for SSE2 assembler versions of Serpent Cipher
*
* Copyright (c) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
*
* Glue code based on aesni-intel_glue.c by:
* Copyright (C) 2008, Intel Corp.
* Author: Huang Ying <ying.huang@intel.com>
*
* CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by:
* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/crypto.h>
#include <linux/err.h>
#include <crypto/algapi.h>
#include <crypto/b128ops.h>
#include <crypto/internal/simd.h>
#include <crypto/serpent.h>
#include "serpent-sse2.h"
#include "ecb_cbc_helpers.h"
static int serpent_setkey_skcipher(struct crypto_skcipher *tfm,
const u8 *key, unsigned int keylen)
{
return __serpent_setkey(crypto_skcipher_ctx(tfm), key, keylen);
}
static void serpent_decrypt_cbc_xway(const void *ctx, u8 *dst, const u8 *src)
{
u8 buf[SERPENT_PARALLEL_BLOCKS - 1][SERPENT_BLOCK_SIZE];
const u8 *s = src;
if (dst == src)
s = memcpy(buf, src, sizeof(buf));
serpent_dec_blk_xway(ctx, dst, src);
crypto_xor(dst + SERPENT_BLOCK_SIZE, s, sizeof(buf));
}
static int ecb_encrypt(struct skcipher_request *req)
{
ECB_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
ECB_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_enc_blk_xway);
ECB_BLOCK(1, __serpent_encrypt);
ECB_WALK_END();
}
static int ecb_decrypt(struct skcipher_request *req)
{
ECB_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
ECB_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_dec_blk_xway);
ECB_BLOCK(1, __serpent_decrypt);
ECB_WALK_END();
}
static int cbc_encrypt(struct skcipher_request *req)
{
CBC_WALK_START(req, SERPENT_BLOCK_SIZE, -1);
CBC_ENC_BLOCK(__serpent_encrypt);
CBC_WALK_END();
}
static int cbc_decrypt(struct skcipher_request *req)
{
CBC_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
CBC_DEC_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_decrypt_cbc_xway);
CBC_DEC_BLOCK(1, __serpent_decrypt);
CBC_WALK_END();
}
static struct skcipher_alg serpent_algs[] = {
{
.base.cra_name = "__ecb(serpent)",
.base.cra_driver_name = "__ecb-serpent-sse2",
.base.cra_priority = 400,
.base.cra_flags = CRYPTO_ALG_INTERNAL,
.base.cra_blocksize = SERPENT_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct serpent_ctx),
.base.cra_module = THIS_MODULE,
.min_keysize = SERPENT_MIN_KEY_SIZE,
.max_keysize = SERPENT_MAX_KEY_SIZE,
.setkey = serpent_setkey_skcipher,
.encrypt = ecb_encrypt,
.decrypt = ecb_decrypt,
}, {
.base.cra_name = "__cbc(serpent)",
.base.cra_driver_name = "__cbc-serpent-sse2",
.base.cra_priority = 400,
.base.cra_flags = CRYPTO_ALG_INTERNAL,
.base.cra_blocksize = SERPENT_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct serpent_ctx),
.base.cra_module = THIS_MODULE,
.min_keysize = SERPENT_MIN_KEY_SIZE,
.max_keysize = SERPENT_MAX_KEY_SIZE,
.ivsize = SERPENT_BLOCK_SIZE,
.setkey = serpent_setkey_skcipher,
.encrypt = cbc_encrypt,
.decrypt = cbc_decrypt,
},
};
static struct simd_skcipher_alg *serpent_simd_algs[ARRAY_SIZE(serpent_algs)];
static int __init serpent_sse2_init(void)
{
if (!boot_cpu_has(X86_FEATURE_XMM2)) {
printk(KERN_INFO "SSE2 instructions are not detected.\n");
return -ENODEV;
}
return simd_register_skciphers_compat(serpent_algs,
ARRAY_SIZE(serpent_algs),
serpent_simd_algs);
}
static void __exit serpent_sse2_exit(void)
{
simd_unregister_skciphers(serpent_algs, ARRAY_SIZE(serpent_algs),
serpent_simd_algs);
}
module_init(serpent_sse2_init);
module_exit(serpent_sse2_exit);
MODULE_DESCRIPTION("Serpent Cipher Algorithm, SSE2 optimized");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CRYPTO("serpent");
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