458 lines
12 KiB
C
458 lines
12 KiB
C
// 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) 2016 - 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/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 iv[]);
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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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asmlinkage void neon_aes_ctr_encrypt(u8 out[], u8 const in[], u32 const rk[],
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int rounds, int bytes, u8 ctr[]);
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asmlinkage void neon_aes_xts_encrypt(u8 out[], u8 const in[],
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u32 const rk1[], int rounds, int bytes,
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u32 const rk2[], u8 iv[], int first);
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asmlinkage void neon_aes_xts_decrypt(u8 out[], u8 const in[],
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u32 const rk1[], int rounds, int bytes,
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u32 const rk2[], u8 iv[], int first);
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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_ctr_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_xts_ctx {
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struct aesbs_ctx key;
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u32 twkey[AES_MAX_KEYLENGTH_U32];
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struct crypto_aes_ctx cts;
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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_ctr_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_ctr_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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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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memzero_explicit(&rk, sizeof(rk));
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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_ctr_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_ctr_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 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_cbc_ctr_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 > 0) {
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int blocks = (walk.nbytes / AES_BLOCK_SIZE) & ~7;
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int nbytes = walk.nbytes % (8 * AES_BLOCK_SIZE);
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const u8 *src = walk.src.virt.addr;
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u8 *dst = walk.dst.virt.addr;
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kernel_neon_begin();
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if (blocks >= 8) {
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aesbs_ctr_encrypt(dst, src, ctx->key.rk, ctx->key.rounds,
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blocks, walk.iv);
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dst += blocks * AES_BLOCK_SIZE;
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src += blocks * AES_BLOCK_SIZE;
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}
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if (nbytes && walk.nbytes == walk.total) {
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neon_aes_ctr_encrypt(dst, src, ctx->enc, ctx->key.rounds,
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nbytes, walk.iv);
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nbytes = 0;
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}
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kernel_neon_end();
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err = skcipher_walk_done(&walk, nbytes);
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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 = aes_expandkey(&ctx->cts, in_key, key_len);
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if (err)
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return err;
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err = aes_expandkey(&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 __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[]))
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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 % (8 * AES_BLOCK_SIZE);
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struct scatterlist sg_src[2], sg_dst[2];
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struct skcipher_request subreq;
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struct scatterlist *src, *dst;
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struct skcipher_walk walk;
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int nbytes, err;
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int first = 1;
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u8 *out, *in;
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if (req->cryptlen < AES_BLOCK_SIZE)
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return -EINVAL;
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/* ensure that the cts tail is covered by a single step */
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if (unlikely(tail > 0 && tail < AES_BLOCK_SIZE)) {
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int xts_blocks = DIV_ROUND_UP(req->cryptlen,
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AES_BLOCK_SIZE) - 2;
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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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xts_blocks * AES_BLOCK_SIZE,
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req->iv);
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req = &subreq;
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} else {
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tail = 0;
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}
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err = skcipher_walk_virt(&walk, req, false);
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if (err)
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return err;
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while (walk.nbytes >= AES_BLOCK_SIZE) {
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int blocks = (walk.nbytes / AES_BLOCK_SIZE) & ~7;
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out = walk.dst.virt.addr;
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in = walk.src.virt.addr;
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nbytes = walk.nbytes;
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kernel_neon_begin();
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if (blocks >= 8) {
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if (first == 1)
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neon_aes_ecb_encrypt(walk.iv, walk.iv,
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ctx->twkey,
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ctx->key.rounds, 1);
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first = 2;
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fn(out, in, ctx->key.rk, ctx->key.rounds, blocks,
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walk.iv);
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out += blocks * AES_BLOCK_SIZE;
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in += blocks * AES_BLOCK_SIZE;
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nbytes -= blocks * AES_BLOCK_SIZE;
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}
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if (walk.nbytes == walk.total && nbytes > 0) {
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if (encrypt)
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neon_aes_xts_encrypt(out, in, ctx->cts.key_enc,
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ctx->key.rounds, nbytes,
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ctx->twkey, walk.iv, first);
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else
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neon_aes_xts_decrypt(out, in, ctx->cts.key_dec,
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ctx->key.rounds, nbytes,
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ctx->twkey, walk.iv, first);
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nbytes = first = 0;
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}
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kernel_neon_end();
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err = skcipher_walk_done(&walk, nbytes);
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}
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if (err || likely(!tail))
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return err;
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/* handle ciphertext stealing */
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dst = src = scatterwalk_ffwd(sg_src, req->src, req->cryptlen);
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if (req->dst != req->src)
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dst = scatterwalk_ffwd(sg_dst, req->dst, req->cryptlen);
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skcipher_request_set_crypt(req, src, dst, AES_BLOCK_SIZE + tail,
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req->iv);
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err = skcipher_walk_virt(&walk, req, false);
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if (err)
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return err;
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out = walk.dst.virt.addr;
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in = walk.src.virt.addr;
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nbytes = walk.nbytes;
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kernel_neon_begin();
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if (encrypt)
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neon_aes_xts_encrypt(out, in, ctx->cts.key_enc, ctx->key.rounds,
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nbytes, ctx->twkey, walk.iv, first);
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else
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neon_aes_xts_decrypt(out, in, ctx->cts.key_dec, ctx->key.rounds,
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nbytes, ctx->twkey, walk.iv, first);
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kernel_neon_end();
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return skcipher_walk_done(&walk, 0);
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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, true, 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, false, 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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.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_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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.walksize = 8 * AES_BLOCK_SIZE,
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.ivsize = AES_BLOCK_SIZE,
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.setkey = aesbs_cbc_ctr_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_cbc_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_cbc_ctr_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 = "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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.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 void aes_exit(void)
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{
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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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if (!cpu_have_named_feature(ASIMD))
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return -ENODEV;
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return crypto_register_skciphers(aes_algs, ARRAY_SIZE(aes_algs));
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}
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module_init(aes_init);
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module_exit(aes_exit);
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