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bda5cd6e29
Stop wrapping skcipher and aead algorithms with the crypto SIMD helper (crypto/simd.c). The only purpose of doing so was to work around x86 not always supporting kernel-mode FPU in softirqs. Specifically, if a hardirq interrupted a task context kernel-mode FPU section and then a softirqs were run at the end of that hardirq, those softirqs could not use kernel-mode FPU. This has now been fixed. In combination with the fact that the skcipher and aead APIs only support task and softirq contexts, these can now just use kernel-mode FPU unconditionally on x86. This simplifies the code and improves performance. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
126 lines
3.5 KiB
C
126 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Glue Code for AVX assembler version of Twofish Cipher
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*
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* Copyright (C) 2012 Johannes Goetzfried
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* <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
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*
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* Copyright © 2013 Jussi Kivilinna <jussi.kivilinna@iki.fi>
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/crypto.h>
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#include <linux/err.h>
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#include <crypto/algapi.h>
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#include <crypto/twofish.h>
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#include "twofish.h"
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#include "ecb_cbc_helpers.h"
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#define TWOFISH_PARALLEL_BLOCKS 8
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/* 8-way parallel cipher functions */
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asmlinkage void twofish_ecb_enc_8way(const void *ctx, u8 *dst, const u8 *src);
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asmlinkage void twofish_ecb_dec_8way(const void *ctx, u8 *dst, const u8 *src);
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asmlinkage void twofish_cbc_dec_8way(const void *ctx, u8 *dst, const u8 *src);
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static int twofish_setkey_skcipher(struct crypto_skcipher *tfm,
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const u8 *key, unsigned int keylen)
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{
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return twofish_setkey(&tfm->base, key, keylen);
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}
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static inline void twofish_enc_blk_3way(const void *ctx, u8 *dst, const u8 *src)
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{
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__twofish_enc_blk_3way(ctx, dst, src, false);
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}
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static int ecb_encrypt(struct skcipher_request *req)
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{
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ECB_WALK_START(req, TF_BLOCK_SIZE, TWOFISH_PARALLEL_BLOCKS);
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ECB_BLOCK(TWOFISH_PARALLEL_BLOCKS, twofish_ecb_enc_8way);
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ECB_BLOCK(3, twofish_enc_blk_3way);
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ECB_BLOCK(1, twofish_enc_blk);
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ECB_WALK_END();
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}
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static int ecb_decrypt(struct skcipher_request *req)
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{
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ECB_WALK_START(req, TF_BLOCK_SIZE, TWOFISH_PARALLEL_BLOCKS);
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ECB_BLOCK(TWOFISH_PARALLEL_BLOCKS, twofish_ecb_dec_8way);
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ECB_BLOCK(3, twofish_dec_blk_3way);
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ECB_BLOCK(1, twofish_dec_blk);
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ECB_WALK_END();
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}
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static int cbc_encrypt(struct skcipher_request *req)
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{
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CBC_WALK_START(req, TF_BLOCK_SIZE, -1);
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CBC_ENC_BLOCK(twofish_enc_blk);
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CBC_WALK_END();
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}
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static int cbc_decrypt(struct skcipher_request *req)
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{
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CBC_WALK_START(req, TF_BLOCK_SIZE, TWOFISH_PARALLEL_BLOCKS);
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CBC_DEC_BLOCK(TWOFISH_PARALLEL_BLOCKS, twofish_cbc_dec_8way);
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CBC_DEC_BLOCK(3, twofish_dec_blk_cbc_3way);
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CBC_DEC_BLOCK(1, twofish_dec_blk);
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CBC_WALK_END();
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}
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static struct skcipher_alg twofish_algs[] = {
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{
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.base.cra_name = "ecb(twofish)",
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.base.cra_driver_name = "ecb-twofish-avx",
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.base.cra_priority = 400,
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.base.cra_blocksize = TF_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct twofish_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = TF_MIN_KEY_SIZE,
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.max_keysize = TF_MAX_KEY_SIZE,
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.setkey = twofish_setkey_skcipher,
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.encrypt = ecb_encrypt,
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.decrypt = ecb_decrypt,
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}, {
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.base.cra_name = "cbc(twofish)",
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.base.cra_driver_name = "cbc-twofish-avx",
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.base.cra_priority = 400,
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.base.cra_blocksize = TF_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct twofish_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = TF_MIN_KEY_SIZE,
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.max_keysize = TF_MAX_KEY_SIZE,
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.ivsize = TF_BLOCK_SIZE,
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.setkey = twofish_setkey_skcipher,
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.encrypt = cbc_encrypt,
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.decrypt = cbc_decrypt,
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},
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};
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static int __init twofish_init(void)
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{
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const char *feature_name;
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if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, &feature_name)) {
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pr_info("CPU feature '%s' is not supported.\n", feature_name);
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return -ENODEV;
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}
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return crypto_register_skciphers(twofish_algs,
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ARRAY_SIZE(twofish_algs));
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}
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static void __exit twofish_exit(void)
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{
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crypto_unregister_skciphers(twofish_algs, ARRAY_SIZE(twofish_algs));
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}
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module_init(twofish_init);
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module_exit(twofish_exit);
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MODULE_DESCRIPTION("Twofish Cipher Algorithm, AVX optimized");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_CRYPTO("twofish");
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