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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Glue Code for AVX assembler versions of Serpent Cipher
*
* Copyright (C) 2012 Johannes Goetzfried
* <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
*
* Copyright © 2011-2013 Jussi Kivilinna <jussi.kivilinna@iki.fi>
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/crypto.h>
#include <linux/err.h>
#include <crypto/algapi.h>
#include <crypto/internal/simd.h>
#include <crypto/serpent.h>
#include <crypto/xts.h>
#include <asm/crypto/glue_helper.h>
#include <asm/crypto/serpent-avx.h>
/* 8-way parallel cipher functions */
asmlinkage void serpent_ecb_enc_8way_avx(const void *ctx, u8 *dst,
const u8 *src);
EXPORT_SYMBOL_GPL(serpent_ecb_enc_8way_avx);
asmlinkage void serpent_ecb_dec_8way_avx(const void *ctx, u8 *dst,
const u8 *src);
EXPORT_SYMBOL_GPL(serpent_ecb_dec_8way_avx);
asmlinkage void serpent_cbc_dec_8way_avx(const void *ctx, u8 *dst,
const u8 *src);
EXPORT_SYMBOL_GPL(serpent_cbc_dec_8way_avx);
asmlinkage void serpent_ctr_8way_avx(const void *ctx, u8 *dst, const u8 *src,
le128 *iv);
EXPORT_SYMBOL_GPL(serpent_ctr_8way_avx);
asmlinkage void serpent_xts_enc_8way_avx(const void *ctx, u8 *dst,
const u8 *src, le128 *iv);
EXPORT_SYMBOL_GPL(serpent_xts_enc_8way_avx);
asmlinkage void serpent_xts_dec_8way_avx(const void *ctx, u8 *dst,
const u8 *src, le128 *iv);
EXPORT_SYMBOL_GPL(serpent_xts_dec_8way_avx);
void __serpent_crypt_ctr(const void *ctx, u8 *d, const u8 *s, le128 *iv)
{
be128 ctrblk;
u128 *dst = (u128 *)d;
const u128 *src = (const u128 *)s;
le128_to_be128(&ctrblk, iv);
le128_inc(iv);
__serpent_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
u128_xor(dst, src, (u128 *)&ctrblk);
}
EXPORT_SYMBOL_GPL(__serpent_crypt_ctr);
void serpent_xts_enc(const void *ctx, u8 *dst, const u8 *src, le128 *iv)
{
glue_xts_crypt_128bit_one(ctx, dst, src, iv, __serpent_encrypt);
}
EXPORT_SYMBOL_GPL(serpent_xts_enc);
void serpent_xts_dec(const void *ctx, u8 *dst, const u8 *src, le128 *iv)
{
glue_xts_crypt_128bit_one(ctx, dst, src, iv, __serpent_decrypt);
}
EXPORT_SYMBOL_GPL(serpent_xts_dec);
static int serpent_setkey_skcipher(struct crypto_skcipher *tfm,
const u8 *key, unsigned int keylen)
{
return __serpent_setkey(crypto_skcipher_ctx(tfm), key, keylen);
}
int xts_serpent_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keylen)
{
struct serpent_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
int err;
err = xts_verify_key(tfm, key, keylen);
if (err)
return err;
/* first half of xts-key is for crypt */
err = __serpent_setkey(&ctx->crypt_ctx, key, keylen / 2);
if (err)
return err;
/* second half of xts-key is for tweak */
return __serpent_setkey(&ctx->tweak_ctx, key + keylen / 2, keylen / 2);
}
EXPORT_SYMBOL_GPL(xts_serpent_setkey);
static const struct common_glue_ctx serpent_enc = {
.num_funcs = 2,
.fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
.funcs = { {
.num_blocks = SERPENT_PARALLEL_BLOCKS,
.fn_u = { .ecb = serpent_ecb_enc_8way_avx }
}, {
.num_blocks = 1,
.fn_u = { .ecb = __serpent_encrypt }
} }
};
static const struct common_glue_ctx serpent_ctr = {
.num_funcs = 2,
.fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
.funcs = { {
.num_blocks = SERPENT_PARALLEL_BLOCKS,
.fn_u = { .ctr = serpent_ctr_8way_avx }
}, {
.num_blocks = 1,
.fn_u = { .ctr = __serpent_crypt_ctr }
} }
};
static const struct common_glue_ctx serpent_enc_xts = {
.num_funcs = 2,
.fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
.funcs = { {
.num_blocks = SERPENT_PARALLEL_BLOCKS,
.fn_u = { .xts = serpent_xts_enc_8way_avx }
}, {
.num_blocks = 1,
.fn_u = { .xts = serpent_xts_enc }
} }
};
static const struct common_glue_ctx serpent_dec = {
.num_funcs = 2,
.fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
.funcs = { {
.num_blocks = SERPENT_PARALLEL_BLOCKS,
.fn_u = { .ecb = serpent_ecb_dec_8way_avx }
}, {
.num_blocks = 1,
.fn_u = { .ecb = __serpent_decrypt }
} }
};
static const struct common_glue_ctx serpent_dec_cbc = {
.num_funcs = 2,
.fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
.funcs = { {
.num_blocks = SERPENT_PARALLEL_BLOCKS,
.fn_u = { .cbc = serpent_cbc_dec_8way_avx }
}, {
.num_blocks = 1,
.fn_u = { .cbc = __serpent_decrypt }
} }
};
static const struct common_glue_ctx serpent_dec_xts = {
.num_funcs = 2,
.fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
.funcs = { {
.num_blocks = SERPENT_PARALLEL_BLOCKS,
.fn_u = { .xts = serpent_xts_dec_8way_avx }
}, {
.num_blocks = 1,
.fn_u = { .xts = serpent_xts_dec }
} }
};
static int ecb_encrypt(struct skcipher_request *req)
{
return glue_ecb_req_128bit(&serpent_enc, req);
}
static int ecb_decrypt(struct skcipher_request *req)
{
return glue_ecb_req_128bit(&serpent_dec, req);
}
static int cbc_encrypt(struct skcipher_request *req)
{
return glue_cbc_encrypt_req_128bit(__serpent_encrypt, req);
}
static int cbc_decrypt(struct skcipher_request *req)
{
return glue_cbc_decrypt_req_128bit(&serpent_dec_cbc, req);
}
static int ctr_crypt(struct skcipher_request *req)
{
return glue_ctr_req_128bit(&serpent_ctr, req);
}
static int xts_encrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct serpent_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
return glue_xts_req_128bit(&serpent_enc_xts, req,
__serpent_encrypt, &ctx->tweak_ctx,
&ctx->crypt_ctx, false);
}
static int xts_decrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct serpent_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
return glue_xts_req_128bit(&serpent_dec_xts, req,
__serpent_encrypt, &ctx->tweak_ctx,
&ctx->crypt_ctx, true);
}
static struct skcipher_alg serpent_algs[] = {
{
.base.cra_name = "__ecb(serpent)",
.base.cra_driver_name = "__ecb-serpent-avx",
.base.cra_priority = 500,
.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-avx",
.base.cra_priority = 500,
.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,
}, {
.base.cra_name = "__ctr(serpent)",
.base.cra_driver_name = "__ctr-serpent-avx",
.base.cra_priority = 500,
.base.cra_flags = CRYPTO_ALG_INTERNAL,
.base.cra_blocksize = 1,
.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,
.chunksize = SERPENT_BLOCK_SIZE,
.setkey = serpent_setkey_skcipher,
.encrypt = ctr_crypt,
.decrypt = ctr_crypt,
}, {
.base.cra_name = "__xts(serpent)",
.base.cra_driver_name = "__xts-serpent-avx",
.base.cra_priority = 500,
.base.cra_flags = CRYPTO_ALG_INTERNAL,
.base.cra_blocksize = SERPENT_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct serpent_xts_ctx),
.base.cra_module = THIS_MODULE,
.min_keysize = 2 * SERPENT_MIN_KEY_SIZE,
.max_keysize = 2 * SERPENT_MAX_KEY_SIZE,
.ivsize = SERPENT_BLOCK_SIZE,
.setkey = xts_serpent_setkey,
.encrypt = xts_encrypt,
.decrypt = xts_decrypt,
},
};
static struct simd_skcipher_alg *serpent_simd_algs[ARRAY_SIZE(serpent_algs)];
static int __init serpent_init(void)
{
const char *feature_name;
if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
&feature_name)) {
pr_info("CPU feature '%s' is not supported.\n", feature_name);
return -ENODEV;
}
return simd_register_skciphers_compat(serpent_algs,
ARRAY_SIZE(serpent_algs),
serpent_simd_algs);
}
static void __exit serpent_exit(void)
{
simd_unregister_skciphers(serpent_algs, ARRAY_SIZE(serpent_algs),
serpent_simd_algs);
}
module_init(serpent_init);
module_exit(serpent_exit);
MODULE_DESCRIPTION("Serpent Cipher Algorithm, AVX optimized");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CRYPTO("serpent");
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