549 lines
14 KiB
C
549 lines
14 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Bit sliced AES using NEON instructions
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*
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* Copyright (C) 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
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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/cbc.h>
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#include <crypto/ctr.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/scatterwalk.h>
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#include <crypto/xts.h>
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#include <linux/module.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 ctr[], 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[], int);
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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[], int);
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struct aesbs_ctx {
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int rounds;
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u8 rk[13 * (8 * AES_BLOCK_SIZE) + 32] __aligned(AES_BLOCK_SIZE);
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};
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struct aesbs_cbc_ctx {
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struct aesbs_ctx key;
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struct crypto_cipher *enc_tfm;
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};
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struct aesbs_xts_ctx {
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struct aesbs_ctx key;
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struct crypto_cipher *cts_tfm;
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struct crypto_cipher *tweak_tfm;
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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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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 = aes_expandkey(&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 = aes_expandkey(&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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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 crypto_cipher_setkey(ctx->enc_tfm, in_key, key_len);
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}
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static void cbc_encrypt_one(struct crypto_skcipher *tfm, const u8 *src, u8 *dst)
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{
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struct aesbs_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
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crypto_cipher_encrypt_one(ctx->enc_tfm, dst, src);
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}
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static int cbc_encrypt(struct skcipher_request *req)
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{
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return crypto_cbc_encrypt_walk(req, cbc_encrypt_one);
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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 cbc_init(struct crypto_tfm *tfm)
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{
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struct aesbs_cbc_ctx *ctx = crypto_tfm_ctx(tfm);
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ctx->enc_tfm = crypto_alloc_cipher("aes", 0, 0);
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return PTR_ERR_OR_ZERO(ctx->enc_tfm);
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}
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static void cbc_exit(struct crypto_tfm *tfm)
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{
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struct aesbs_cbc_ctx *ctx = crypto_tfm_ctx(tfm);
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crypto_free_cipher(ctx->enc_tfm);
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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 = aes_expandkey(&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 void ctr_encrypt_one(struct crypto_skcipher *tfm, const u8 *src, u8 *dst)
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{
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struct aesbs_ctr_ctx *ctx = crypto_skcipher_ctx(tfm);
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unsigned long flags;
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/*
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* Temporarily disable interrupts to avoid races where
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* cachelines are evicted when the CPU is interrupted
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* to do something else.
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*/
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local_irq_save(flags);
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aes_encrypt(&ctx->fallback, dst, src);
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local_irq_restore(flags);
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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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if (!crypto_simd_usable())
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return crypto_ctr_encrypt_walk(req, ctr_encrypt_one);
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return ctr_encrypt(req);
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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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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_cipher_setkey(ctx->cts_tfm, in_key, key_len);
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if (err)
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return err;
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err = crypto_cipher_setkey(ctx->tweak_tfm, in_key + key_len, key_len);
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if (err)
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return err;
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return aesbs_setkey(tfm, in_key, key_len);
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}
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static int xts_init(struct crypto_tfm *tfm)
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{
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struct aesbs_xts_ctx *ctx = crypto_tfm_ctx(tfm);
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ctx->cts_tfm = crypto_alloc_cipher("aes", 0, 0);
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if (IS_ERR(ctx->cts_tfm))
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return PTR_ERR(ctx->cts_tfm);
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ctx->tweak_tfm = crypto_alloc_cipher("aes", 0, 0);
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if (IS_ERR(ctx->tweak_tfm))
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crypto_free_cipher(ctx->cts_tfm);
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return PTR_ERR_OR_ZERO(ctx->tweak_tfm);
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}
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static void xts_exit(struct crypto_tfm *tfm)
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{
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struct aesbs_xts_ctx *ctx = crypto_tfm_ctx(tfm);
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crypto_free_cipher(ctx->tweak_tfm);
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crypto_free_cipher(ctx->cts_tfm);
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}
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static int __xts_crypt(struct skcipher_request *req, bool encrypt,
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void (*fn)(u8 out[], u8 const in[], u8 const rk[],
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int rounds, int blocks, u8 iv[], int))
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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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int tail = req->cryptlen % AES_BLOCK_SIZE;
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struct skcipher_request subreq;
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u8 buf[2 * AES_BLOCK_SIZE];
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struct skcipher_walk walk;
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int err;
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if (req->cryptlen < AES_BLOCK_SIZE)
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return -EINVAL;
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if (unlikely(tail)) {
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skcipher_request_set_tfm(&subreq, tfm);
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skcipher_request_set_callback(&subreq,
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skcipher_request_flags(req),
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NULL, NULL);
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skcipher_request_set_crypt(&subreq, req->src, req->dst,
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req->cryptlen - tail, req->iv);
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req = &subreq;
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}
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err = skcipher_walk_virt(&walk, req, true);
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if (err)
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return err;
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crypto_cipher_encrypt_one(ctx->tweak_tfm, walk.iv, walk.iv);
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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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int reorder_last_tweak = !encrypt && tail > 0;
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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);
|
||
|
|
reorder_last_tweak = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
kernel_neon_begin();
|
||
|
|
fn(walk.dst.virt.addr, walk.src.virt.addr, ctx->key.rk,
|
||
|
|
ctx->key.rounds, blocks, walk.iv, reorder_last_tweak);
|
||
|
|
kernel_neon_end();
|
||
|
|
err = skcipher_walk_done(&walk,
|
||
|
|
walk.nbytes - blocks * AES_BLOCK_SIZE);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (err || likely(!tail))
|
||
|
|
return err;
|
||
|
|
|
||
|
|
/* handle ciphertext stealing */
|
||
|
|
scatterwalk_map_and_copy(buf, req->dst, req->cryptlen - AES_BLOCK_SIZE,
|
||
|
|
AES_BLOCK_SIZE, 0);
|
||
|
|
memcpy(buf + AES_BLOCK_SIZE, buf, tail);
|
||
|
|
scatterwalk_map_and_copy(buf, req->src, req->cryptlen, tail, 0);
|
||
|
|
|
||
|
|
crypto_xor(buf, req->iv, AES_BLOCK_SIZE);
|
||
|
|
|
||
|
|
if (encrypt)
|
||
|
|
crypto_cipher_encrypt_one(ctx->cts_tfm, buf, buf);
|
||
|
|
else
|
||
|
|
crypto_cipher_decrypt_one(ctx->cts_tfm, buf, buf);
|
||
|
|
|
||
|
|
crypto_xor(buf, req->iv, AES_BLOCK_SIZE);
|
||
|
|
|
||
|
|
scatterwalk_map_and_copy(buf, req->dst, req->cryptlen - AES_BLOCK_SIZE,
|
||
|
|
AES_BLOCK_SIZE + tail, 1);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int xts_encrypt(struct skcipher_request *req)
|
||
|
|
{
|
||
|
|
return __xts_crypt(req, true, aesbs_xts_encrypt);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int xts_decrypt(struct skcipher_request *req)
|
||
|
|
{
|
||
|
|
return __xts_crypt(req, false, aesbs_xts_decrypt);
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct skcipher_alg aes_algs[] = { {
|
||
|
|
.base.cra_name = "__ecb(aes)",
|
||
|
|
.base.cra_driver_name = "__ecb-aes-neonbs",
|
||
|
|
.base.cra_priority = 250,
|
||
|
|
.base.cra_blocksize = AES_BLOCK_SIZE,
|
||
|
|
.base.cra_ctxsize = sizeof(struct aesbs_ctx),
|
||
|
|
.base.cra_module = THIS_MODULE,
|
||
|
|
.base.cra_flags = CRYPTO_ALG_INTERNAL,
|
||
|
|
|
||
|
|
.min_keysize = AES_MIN_KEY_SIZE,
|
||
|
|
.max_keysize = AES_MAX_KEY_SIZE,
|
||
|
|
.walksize = 8 * AES_BLOCK_SIZE,
|
||
|
|
.setkey = aesbs_setkey,
|
||
|
|
.encrypt = ecb_encrypt,
|
||
|
|
.decrypt = ecb_decrypt,
|
||
|
|
}, {
|
||
|
|
.base.cra_name = "__cbc(aes)",
|
||
|
|
.base.cra_driver_name = "__cbc-aes-neonbs",
|
||
|
|
.base.cra_priority = 250,
|
||
|
|
.base.cra_blocksize = AES_BLOCK_SIZE,
|
||
|
|
.base.cra_ctxsize = sizeof(struct aesbs_cbc_ctx),
|
||
|
|
.base.cra_module = THIS_MODULE,
|
||
|
|
.base.cra_flags = CRYPTO_ALG_INTERNAL,
|
||
|
|
.base.cra_init = cbc_init,
|
||
|
|
.base.cra_exit = cbc_exit,
|
||
|
|
|
||
|
|
.min_keysize = AES_MIN_KEY_SIZE,
|
||
|
|
.max_keysize = AES_MAX_KEY_SIZE,
|
||
|
|
.walksize = 8 * AES_BLOCK_SIZE,
|
||
|
|
.ivsize = AES_BLOCK_SIZE,
|
||
|
|
.setkey = aesbs_cbc_setkey,
|
||
|
|
.encrypt = cbc_encrypt,
|
||
|
|
.decrypt = cbc_decrypt,
|
||
|
|
}, {
|
||
|
|
.base.cra_name = "__ctr(aes)",
|
||
|
|
.base.cra_driver_name = "__ctr-aes-neonbs",
|
||
|
|
.base.cra_priority = 250,
|
||
|
|
.base.cra_blocksize = 1,
|
||
|
|
.base.cra_ctxsize = sizeof(struct aesbs_ctx),
|
||
|
|
.base.cra_module = THIS_MODULE,
|
||
|
|
.base.cra_flags = CRYPTO_ALG_INTERNAL,
|
||
|
|
|
||
|
|
.min_keysize = AES_MIN_KEY_SIZE,
|
||
|
|
.max_keysize = AES_MAX_KEY_SIZE,
|
||
|
|
.chunksize = AES_BLOCK_SIZE,
|
||
|
|
.walksize = 8 * AES_BLOCK_SIZE,
|
||
|
|
.ivsize = AES_BLOCK_SIZE,
|
||
|
|
.setkey = aesbs_setkey,
|
||
|
|
.encrypt = ctr_encrypt,
|
||
|
|
.decrypt = ctr_encrypt,
|
||
|
|
}, {
|
||
|
|
.base.cra_name = "ctr(aes)",
|
||
|
|
.base.cra_driver_name = "ctr-aes-neonbs-sync",
|
||
|
|
.base.cra_priority = 250 - 1,
|
||
|
|
.base.cra_blocksize = 1,
|
||
|
|
.base.cra_ctxsize = sizeof(struct aesbs_ctr_ctx),
|
||
|
|
.base.cra_module = THIS_MODULE,
|
||
|
|
|
||
|
|
.min_keysize = AES_MIN_KEY_SIZE,
|
||
|
|
.max_keysize = AES_MAX_KEY_SIZE,
|
||
|
|
.chunksize = AES_BLOCK_SIZE,
|
||
|
|
.walksize = 8 * AES_BLOCK_SIZE,
|
||
|
|
.ivsize = AES_BLOCK_SIZE,
|
||
|
|
.setkey = aesbs_ctr_setkey_sync,
|
||
|
|
.encrypt = ctr_encrypt_sync,
|
||
|
|
.decrypt = ctr_encrypt_sync,
|
||
|
|
}, {
|
||
|
|
.base.cra_name = "__xts(aes)",
|
||
|
|
.base.cra_driver_name = "__xts-aes-neonbs",
|
||
|
|
.base.cra_priority = 250,
|
||
|
|
.base.cra_blocksize = AES_BLOCK_SIZE,
|
||
|
|
.base.cra_ctxsize = sizeof(struct aesbs_xts_ctx),
|
||
|
|
.base.cra_module = THIS_MODULE,
|
||
|
|
.base.cra_flags = CRYPTO_ALG_INTERNAL,
|
||
|
|
.base.cra_init = xts_init,
|
||
|
|
.base.cra_exit = xts_exit,
|
||
|
|
|
||
|
|
.min_keysize = 2 * AES_MIN_KEY_SIZE,
|
||
|
|
.max_keysize = 2 * AES_MAX_KEY_SIZE,
|
||
|
|
.walksize = 8 * AES_BLOCK_SIZE,
|
||
|
|
.ivsize = AES_BLOCK_SIZE,
|
||
|
|
.setkey = aesbs_xts_setkey,
|
||
|
|
.encrypt = xts_encrypt,
|
||
|
|
.decrypt = xts_decrypt,
|
||
|
|
} };
|
||
|
|
|
||
|
|
static struct simd_skcipher_alg *aes_simd_algs[ARRAY_SIZE(aes_algs)];
|
||
|
|
|
||
|
|
static void aes_exit(void)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
|
||
|
|
for (i = 0; i < ARRAY_SIZE(aes_simd_algs); i++)
|
||
|
|
if (aes_simd_algs[i])
|
||
|
|
simd_skcipher_free(aes_simd_algs[i]);
|
||
|
|
|
||
|
|
crypto_unregister_skciphers(aes_algs, ARRAY_SIZE(aes_algs));
|
||
|
|
}
|
||
|
|
|
||
|
|
static int __init aes_init(void)
|
||
|
|
{
|
||
|
|
struct simd_skcipher_alg *simd;
|
||
|
|
const char *basename;
|
||
|
|
const char *algname;
|
||
|
|
const char *drvname;
|
||
|
|
int err;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
if (!(elf_hwcap & HWCAP_NEON))
|
||
|
|
return -ENODEV;
|
||
|
|
|
||
|
|
err = crypto_register_skciphers(aes_algs, ARRAY_SIZE(aes_algs));
|
||
|
|
if (err)
|
||
|
|
return err;
|
||
|
|
|
||
|
|
for (i = 0; i < ARRAY_SIZE(aes_algs); i++) {
|
||
|
|
if (!(aes_algs[i].base.cra_flags & CRYPTO_ALG_INTERNAL))
|
||
|
|
continue;
|
||
|
|
|
||
|
|
algname = aes_algs[i].base.cra_name + 2;
|
||
|
|
drvname = aes_algs[i].base.cra_driver_name + 2;
|
||
|
|
basename = aes_algs[i].base.cra_driver_name;
|
||
|
|
simd = simd_skcipher_create_compat(algname, drvname, basename);
|
||
|
|
err = PTR_ERR(simd);
|
||
|
|
if (IS_ERR(simd))
|
||
|
|
goto unregister_simds;
|
||
|
|
|
||
|
|
aes_simd_algs[i] = simd;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
unregister_simds:
|
||
|
|
aes_exit();
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
late_initcall(aes_init);
|
||
|
|
module_exit(aes_exit);
|