mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-10 10:39:26 +00:00
78ad7b08d8
When kernel mode NEON was first introduced on arm64, the preserve and restore of the userland NEON state was completely unoptimized, and involved saving all registers on each call to kernel_neon_begin(), and restoring them on each call to kernel_neon_end(). For this reason, the NEON crypto code that was introduced at the time keeps the NEON enabled throughout the execution of the crypto API methods, which may include calls back into the crypto API that could result in memory allocation or other actions that we should avoid when running with preemption disabled. Since then, we have optimized the kernel mode NEON handling, which now restores lazily (upon return to userland), and so the preserve action is only costly the first time it is called after entering the kernel. So let's put the kernel_neon_begin() and kernel_neon_end() calls around the actual invocations of the NEON crypto code, and run the remainder of the code with kernel mode NEON disabled (and preemption enabled) Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
472 lines
12 KiB
C
472 lines
12 KiB
C
/*
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* Bit sliced AES using NEON instructions
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*
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* Copyright (C) 2016 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <asm/neon.h>
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#include <asm/simd.h>
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#include <crypto/aes.h>
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#include <crypto/internal/simd.h>
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#include <crypto/internal/skcipher.h>
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#include <crypto/xts.h>
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#include <linux/module.h>
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#include "aes-ctr-fallback.h"
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MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS_CRYPTO("ecb(aes)");
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MODULE_ALIAS_CRYPTO("cbc(aes)");
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MODULE_ALIAS_CRYPTO("ctr(aes)");
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MODULE_ALIAS_CRYPTO("xts(aes)");
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asmlinkage void aesbs_convert_key(u8 out[], u32 const rk[], int rounds);
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asmlinkage void aesbs_ecb_encrypt(u8 out[], u8 const in[], u8 const rk[],
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int rounds, int blocks);
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asmlinkage void aesbs_ecb_decrypt(u8 out[], u8 const in[], u8 const rk[],
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int rounds, int blocks);
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asmlinkage void aesbs_cbc_decrypt(u8 out[], u8 const in[], u8 const rk[],
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int rounds, int blocks, u8 iv[]);
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asmlinkage void aesbs_ctr_encrypt(u8 out[], u8 const in[], u8 const rk[],
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int rounds, int blocks, u8 iv[], u8 final[]);
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asmlinkage void aesbs_xts_encrypt(u8 out[], u8 const in[], u8 const rk[],
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int rounds, int blocks, u8 iv[]);
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asmlinkage void aesbs_xts_decrypt(u8 out[], u8 const in[], u8 const rk[],
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int rounds, int blocks, u8 iv[]);
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/* borrowed from aes-neon-blk.ko */
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asmlinkage void neon_aes_ecb_encrypt(u8 out[], u8 const in[], u32 const rk[],
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int rounds, int blocks);
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asmlinkage void neon_aes_cbc_encrypt(u8 out[], u8 const in[], u32 const rk[],
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int rounds, int blocks, u8 iv[]);
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struct aesbs_ctx {
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u8 rk[13 * (8 * AES_BLOCK_SIZE) + 32];
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int rounds;
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} __aligned(AES_BLOCK_SIZE);
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struct aesbs_cbc_ctx {
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struct aesbs_ctx key;
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u32 enc[AES_MAX_KEYLENGTH_U32];
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};
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struct aesbs_ctr_ctx {
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struct aesbs_ctx key; /* must be first member */
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struct crypto_aes_ctx fallback;
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};
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struct aesbs_xts_ctx {
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struct aesbs_ctx key;
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u32 twkey[AES_MAX_KEYLENGTH_U32];
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};
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static int aesbs_setkey(struct crypto_skcipher *tfm, const u8 *in_key,
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unsigned int key_len)
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{
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struct aesbs_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct crypto_aes_ctx rk;
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int err;
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err = crypto_aes_expand_key(&rk, in_key, key_len);
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if (err)
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return err;
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ctx->rounds = 6 + key_len / 4;
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kernel_neon_begin();
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aesbs_convert_key(ctx->rk, rk.key_enc, ctx->rounds);
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kernel_neon_end();
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return 0;
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}
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static int __ecb_crypt(struct skcipher_request *req,
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void (*fn)(u8 out[], u8 const in[], u8 const rk[],
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int rounds, int blocks))
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct aesbs_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_walk walk;
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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while (walk.nbytes >= AES_BLOCK_SIZE) {
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unsigned int blocks = walk.nbytes / AES_BLOCK_SIZE;
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if (walk.nbytes < walk.total)
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blocks = round_down(blocks,
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walk.stride / AES_BLOCK_SIZE);
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kernel_neon_begin();
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fn(walk.dst.virt.addr, walk.src.virt.addr, ctx->rk,
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ctx->rounds, blocks);
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kernel_neon_end();
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err = skcipher_walk_done(&walk,
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walk.nbytes - blocks * AES_BLOCK_SIZE);
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}
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return err;
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}
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static int ecb_encrypt(struct skcipher_request *req)
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{
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return __ecb_crypt(req, aesbs_ecb_encrypt);
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}
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static int ecb_decrypt(struct skcipher_request *req)
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{
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return __ecb_crypt(req, aesbs_ecb_decrypt);
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}
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static int aesbs_cbc_setkey(struct crypto_skcipher *tfm, const u8 *in_key,
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unsigned int key_len)
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{
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struct aesbs_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct crypto_aes_ctx rk;
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int err;
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err = crypto_aes_expand_key(&rk, in_key, key_len);
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if (err)
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return err;
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ctx->key.rounds = 6 + key_len / 4;
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memcpy(ctx->enc, rk.key_enc, sizeof(ctx->enc));
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kernel_neon_begin();
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aesbs_convert_key(ctx->key.rk, rk.key_enc, ctx->key.rounds);
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kernel_neon_end();
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return 0;
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}
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static int cbc_encrypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct aesbs_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_walk walk;
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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while (walk.nbytes >= AES_BLOCK_SIZE) {
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unsigned int blocks = walk.nbytes / AES_BLOCK_SIZE;
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/* fall back to the non-bitsliced NEON implementation */
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kernel_neon_begin();
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neon_aes_cbc_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
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ctx->enc, ctx->key.rounds, blocks,
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walk.iv);
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kernel_neon_end();
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err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
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}
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return err;
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}
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static int cbc_decrypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct aesbs_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_walk walk;
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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while (walk.nbytes >= AES_BLOCK_SIZE) {
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unsigned int blocks = walk.nbytes / AES_BLOCK_SIZE;
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if (walk.nbytes < walk.total)
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blocks = round_down(blocks,
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walk.stride / AES_BLOCK_SIZE);
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kernel_neon_begin();
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aesbs_cbc_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
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ctx->key.rk, ctx->key.rounds, blocks,
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walk.iv);
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kernel_neon_end();
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err = skcipher_walk_done(&walk,
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walk.nbytes - blocks * AES_BLOCK_SIZE);
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}
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return err;
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}
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static int aesbs_ctr_setkey_sync(struct crypto_skcipher *tfm, const u8 *in_key,
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unsigned int key_len)
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{
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struct aesbs_ctr_ctx *ctx = crypto_skcipher_ctx(tfm);
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int err;
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err = crypto_aes_expand_key(&ctx->fallback, in_key, key_len);
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if (err)
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return err;
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ctx->key.rounds = 6 + key_len / 4;
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kernel_neon_begin();
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aesbs_convert_key(ctx->key.rk, ctx->fallback.key_enc, ctx->key.rounds);
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kernel_neon_end();
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return 0;
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}
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static int ctr_encrypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct aesbs_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_walk walk;
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u8 buf[AES_BLOCK_SIZE];
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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while (walk.nbytes > 0) {
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unsigned int blocks = walk.nbytes / AES_BLOCK_SIZE;
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u8 *final = (walk.total % AES_BLOCK_SIZE) ? buf : NULL;
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if (walk.nbytes < walk.total) {
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blocks = round_down(blocks,
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walk.stride / AES_BLOCK_SIZE);
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final = NULL;
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}
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kernel_neon_begin();
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aesbs_ctr_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
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ctx->rk, ctx->rounds, blocks, walk.iv, final);
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kernel_neon_end();
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if (final) {
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u8 *dst = walk.dst.virt.addr + blocks * AES_BLOCK_SIZE;
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u8 *src = walk.src.virt.addr + blocks * AES_BLOCK_SIZE;
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crypto_xor_cpy(dst, src, final,
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walk.total % AES_BLOCK_SIZE);
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err = skcipher_walk_done(&walk, 0);
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break;
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}
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err = skcipher_walk_done(&walk,
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walk.nbytes - blocks * AES_BLOCK_SIZE);
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}
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return err;
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}
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static int aesbs_xts_setkey(struct crypto_skcipher *tfm, const u8 *in_key,
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unsigned int key_len)
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{
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struct aesbs_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct crypto_aes_ctx rk;
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int err;
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err = xts_verify_key(tfm, in_key, key_len);
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if (err)
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return err;
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key_len /= 2;
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err = crypto_aes_expand_key(&rk, in_key + key_len, key_len);
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if (err)
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return err;
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memcpy(ctx->twkey, rk.key_enc, sizeof(ctx->twkey));
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return aesbs_setkey(tfm, in_key, key_len);
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}
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static int ctr_encrypt_sync(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct aesbs_ctr_ctx *ctx = crypto_skcipher_ctx(tfm);
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if (!may_use_simd())
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return aes_ctr_encrypt_fallback(&ctx->fallback, req);
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return ctr_encrypt(req);
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}
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static int __xts_crypt(struct skcipher_request *req,
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void (*fn)(u8 out[], u8 const in[], u8 const rk[],
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int rounds, int blocks, u8 iv[]))
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct aesbs_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_walk walk;
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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kernel_neon_begin();
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neon_aes_ecb_encrypt(walk.iv, walk.iv, ctx->twkey, ctx->key.rounds, 1);
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kernel_neon_end();
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while (walk.nbytes >= AES_BLOCK_SIZE) {
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unsigned int blocks = walk.nbytes / AES_BLOCK_SIZE;
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if (walk.nbytes < walk.total)
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blocks = round_down(blocks,
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walk.stride / AES_BLOCK_SIZE);
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kernel_neon_begin();
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fn(walk.dst.virt.addr, walk.src.virt.addr, ctx->key.rk,
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ctx->key.rounds, blocks, walk.iv);
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kernel_neon_end();
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err = skcipher_walk_done(&walk,
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walk.nbytes - blocks * AES_BLOCK_SIZE);
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}
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return err;
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}
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static int xts_encrypt(struct skcipher_request *req)
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{
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return __xts_crypt(req, aesbs_xts_encrypt);
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}
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static int xts_decrypt(struct skcipher_request *req)
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{
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return __xts_crypt(req, aesbs_xts_decrypt);
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}
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static struct skcipher_alg aes_algs[] = { {
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.base.cra_name = "__ecb(aes)",
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.base.cra_driver_name = "__ecb-aes-neonbs",
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.base.cra_priority = 250,
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.base.cra_blocksize = AES_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct aesbs_ctx),
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.base.cra_module = THIS_MODULE,
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.base.cra_flags = CRYPTO_ALG_INTERNAL,
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.min_keysize = AES_MIN_KEY_SIZE,
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.max_keysize = AES_MAX_KEY_SIZE,
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.walksize = 8 * AES_BLOCK_SIZE,
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.setkey = aesbs_setkey,
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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(aes)",
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.base.cra_driver_name = "__cbc-aes-neonbs",
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.base.cra_priority = 250,
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.base.cra_blocksize = AES_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct aesbs_cbc_ctx),
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.base.cra_module = THIS_MODULE,
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.base.cra_flags = CRYPTO_ALG_INTERNAL,
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.min_keysize = AES_MIN_KEY_SIZE,
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.max_keysize = AES_MAX_KEY_SIZE,
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.walksize = 8 * AES_BLOCK_SIZE,
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.ivsize = AES_BLOCK_SIZE,
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.setkey = aesbs_cbc_setkey,
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.encrypt = cbc_encrypt,
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.decrypt = cbc_decrypt,
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}, {
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.base.cra_name = "__ctr(aes)",
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.base.cra_driver_name = "__ctr-aes-neonbs",
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.base.cra_priority = 250,
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.base.cra_blocksize = 1,
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.base.cra_ctxsize = sizeof(struct aesbs_ctx),
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.base.cra_module = THIS_MODULE,
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.base.cra_flags = CRYPTO_ALG_INTERNAL,
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.min_keysize = AES_MIN_KEY_SIZE,
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.max_keysize = AES_MAX_KEY_SIZE,
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.chunksize = AES_BLOCK_SIZE,
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.walksize = 8 * AES_BLOCK_SIZE,
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.ivsize = AES_BLOCK_SIZE,
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.setkey = aesbs_setkey,
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.encrypt = ctr_encrypt,
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.decrypt = ctr_encrypt,
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}, {
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.base.cra_name = "ctr(aes)",
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.base.cra_driver_name = "ctr-aes-neonbs",
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.base.cra_priority = 250 - 1,
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.base.cra_blocksize = 1,
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.base.cra_ctxsize = sizeof(struct aesbs_ctr_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = AES_MIN_KEY_SIZE,
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.max_keysize = AES_MAX_KEY_SIZE,
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.chunksize = AES_BLOCK_SIZE,
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.walksize = 8 * AES_BLOCK_SIZE,
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.ivsize = AES_BLOCK_SIZE,
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.setkey = aesbs_ctr_setkey_sync,
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.encrypt = ctr_encrypt_sync,
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.decrypt = ctr_encrypt_sync,
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}, {
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.base.cra_name = "__xts(aes)",
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.base.cra_driver_name = "__xts-aes-neonbs",
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.base.cra_priority = 250,
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.base.cra_blocksize = AES_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct aesbs_xts_ctx),
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.base.cra_module = THIS_MODULE,
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.base.cra_flags = CRYPTO_ALG_INTERNAL,
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.min_keysize = 2 * AES_MIN_KEY_SIZE,
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.max_keysize = 2 * AES_MAX_KEY_SIZE,
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.walksize = 8 * AES_BLOCK_SIZE,
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.ivsize = AES_BLOCK_SIZE,
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.setkey = aesbs_xts_setkey,
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.encrypt = xts_encrypt,
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.decrypt = xts_decrypt,
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} };
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static struct simd_skcipher_alg *aes_simd_algs[ARRAY_SIZE(aes_algs)];
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static void aes_exit(void)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(aes_simd_algs); i++)
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if (aes_simd_algs[i])
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simd_skcipher_free(aes_simd_algs[i]);
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crypto_unregister_skciphers(aes_algs, ARRAY_SIZE(aes_algs));
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}
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static int __init aes_init(void)
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{
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struct simd_skcipher_alg *simd;
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const char *basename;
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const char *algname;
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const char *drvname;
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int err;
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int i;
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if (!(elf_hwcap & HWCAP_ASIMD))
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return -ENODEV;
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err = crypto_register_skciphers(aes_algs, ARRAY_SIZE(aes_algs));
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if (err)
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return err;
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for (i = 0; i < ARRAY_SIZE(aes_algs); i++) {
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if (!(aes_algs[i].base.cra_flags & CRYPTO_ALG_INTERNAL))
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continue;
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algname = aes_algs[i].base.cra_name + 2;
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drvname = aes_algs[i].base.cra_driver_name + 2;
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basename = aes_algs[i].base.cra_driver_name;
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simd = simd_skcipher_create_compat(algname, drvname, basename);
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err = PTR_ERR(simd);
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if (IS_ERR(simd))
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goto unregister_simds;
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aes_simd_algs[i] = simd;
|
|
}
|
|
return 0;
|
|
|
|
unregister_simds:
|
|
aes_exit();
|
|
return err;
|
|
}
|
|
|
|
module_init(aes_init);
|
|
module_exit(aes_exit);
|