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cc01d2840f
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>
124 lines
3.4 KiB
C
124 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Glue Code for SSE2 assembler versions of Serpent Cipher
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*
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* Copyright (c) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
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*
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* Glue code based on aesni-intel_glue.c by:
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* Copyright (C) 2008, Intel Corp.
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* Author: Huang Ying <ying.huang@intel.com>
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*
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* CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by:
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* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
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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/b128ops.h>
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#include <crypto/serpent.h>
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#include "serpent-sse2.h"
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#include "ecb_cbc_helpers.h"
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static int serpent_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 __serpent_setkey(crypto_skcipher_ctx(tfm), key, keylen);
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}
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static void serpent_decrypt_cbc_xway(const void *ctx, u8 *dst, const u8 *src)
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{
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u8 buf[SERPENT_PARALLEL_BLOCKS - 1][SERPENT_BLOCK_SIZE];
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const u8 *s = src;
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if (dst == src)
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s = memcpy(buf, src, sizeof(buf));
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serpent_dec_blk_xway(ctx, dst, src);
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crypto_xor(dst + SERPENT_BLOCK_SIZE, s, sizeof(buf));
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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, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
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ECB_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_enc_blk_xway);
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ECB_BLOCK(1, __serpent_encrypt);
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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, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
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ECB_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_dec_blk_xway);
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ECB_BLOCK(1, __serpent_decrypt);
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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, SERPENT_BLOCK_SIZE, -1);
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CBC_ENC_BLOCK(__serpent_encrypt);
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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, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
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CBC_DEC_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_decrypt_cbc_xway);
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CBC_DEC_BLOCK(1, __serpent_decrypt);
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CBC_WALK_END();
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}
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static struct skcipher_alg serpent_algs[] = {
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{
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.base.cra_name = "ecb(serpent)",
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.base.cra_driver_name = "ecb-serpent-sse2",
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.base.cra_priority = 400,
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.base.cra_blocksize = SERPENT_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct serpent_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = SERPENT_MIN_KEY_SIZE,
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.max_keysize = SERPENT_MAX_KEY_SIZE,
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.setkey = serpent_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(serpent)",
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.base.cra_driver_name = "cbc-serpent-sse2",
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.base.cra_priority = 400,
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.base.cra_blocksize = SERPENT_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct serpent_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = SERPENT_MIN_KEY_SIZE,
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.max_keysize = SERPENT_MAX_KEY_SIZE,
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.ivsize = SERPENT_BLOCK_SIZE,
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.setkey = serpent_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 serpent_sse2_init(void)
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{
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if (!boot_cpu_has(X86_FEATURE_XMM2)) {
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printk(KERN_INFO "SSE2 instructions are not detected.\n");
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return -ENODEV;
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}
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return crypto_register_skciphers(serpent_algs,
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ARRAY_SIZE(serpent_algs));
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}
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static void __exit serpent_sse2_exit(void)
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{
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crypto_unregister_skciphers(serpent_algs, ARRAY_SIZE(serpent_algs));
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}
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module_init(serpent_sse2_init);
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module_exit(serpent_sse2_exit);
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MODULE_DESCRIPTION("Serpent Cipher Algorithm, SSE2 optimized");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_CRYPTO("serpent");
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