443 lines
11 KiB
C
443 lines
11 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* SM4 Cipher Algorithm, using ARMv8 NEON
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* as specified in
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* https://tools.ietf.org/id/draft-ribose-cfrg-sm4-10.html
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*
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* Copyright (C) 2022, Alibaba Group.
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* Copyright (C) 2022 Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
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*/
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#include <linux/module.h>
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#include <linux/crypto.h>
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#include <linux/kernel.h>
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#include <linux/cpufeature.h>
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#include <asm/neon.h>
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#include <asm/simd.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/sm4.h>
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#define BYTES2BLKS(nbytes) ((nbytes) >> 4)
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#define BYTES2BLK8(nbytes) (((nbytes) >> 4) & ~(8 - 1))
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asmlinkage void sm4_neon_crypt_blk1_8(const u32 *rkey, u8 *dst, const u8 *src,
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unsigned int nblks);
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asmlinkage void sm4_neon_crypt_blk8(const u32 *rkey, u8 *dst, const u8 *src,
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unsigned int nblks);
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asmlinkage void sm4_neon_cbc_dec_blk8(const u32 *rkey, u8 *dst, const u8 *src,
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u8 *iv, unsigned int nblks);
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asmlinkage void sm4_neon_cfb_dec_blk8(const u32 *rkey, u8 *dst, const u8 *src,
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u8 *iv, unsigned int nblks);
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asmlinkage void sm4_neon_ctr_enc_blk8(const u32 *rkey, u8 *dst, const u8 *src,
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u8 *iv, unsigned int nblks);
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static int sm4_setkey(struct crypto_skcipher *tfm, const u8 *key,
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unsigned int key_len)
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{
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struct sm4_ctx *ctx = crypto_skcipher_ctx(tfm);
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return sm4_expandkey(ctx, key, key_len);
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}
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static int sm4_ecb_do_crypt(struct skcipher_request *req, const u32 *rkey)
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{
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struct skcipher_walk walk;
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unsigned int nbytes;
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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while ((nbytes = walk.nbytes) > 0) {
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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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unsigned int nblks;
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kernel_neon_begin();
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nblks = BYTES2BLK8(nbytes);
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if (nblks) {
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sm4_neon_crypt_blk8(rkey, dst, src, nblks);
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dst += nblks * SM4_BLOCK_SIZE;
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src += nblks * SM4_BLOCK_SIZE;
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nbytes -= nblks * SM4_BLOCK_SIZE;
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}
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nblks = BYTES2BLKS(nbytes);
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if (nblks) {
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sm4_neon_crypt_blk1_8(rkey, dst, src, nblks);
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nbytes -= nblks * SM4_BLOCK_SIZE;
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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 sm4_ecb_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 sm4_ctx *ctx = crypto_skcipher_ctx(tfm);
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return sm4_ecb_do_crypt(req, ctx->rkey_enc);
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}
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static int sm4_ecb_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 sm4_ctx *ctx = crypto_skcipher_ctx(tfm);
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return sm4_ecb_do_crypt(req, ctx->rkey_dec);
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}
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static int sm4_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 sm4_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_walk walk;
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unsigned int nbytes;
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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while ((nbytes = walk.nbytes) > 0) {
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const u8 *iv = walk.iv;
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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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while (nbytes >= SM4_BLOCK_SIZE) {
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crypto_xor_cpy(dst, src, iv, SM4_BLOCK_SIZE);
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sm4_crypt_block(ctx->rkey_enc, dst, dst);
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iv = dst;
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src += SM4_BLOCK_SIZE;
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dst += SM4_BLOCK_SIZE;
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nbytes -= SM4_BLOCK_SIZE;
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}
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if (iv != walk.iv)
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memcpy(walk.iv, iv, SM4_BLOCK_SIZE);
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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 sm4_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 sm4_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_walk walk;
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unsigned int nbytes;
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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while ((nbytes = walk.nbytes) > 0) {
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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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unsigned int nblks;
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kernel_neon_begin();
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nblks = BYTES2BLK8(nbytes);
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if (nblks) {
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sm4_neon_cbc_dec_blk8(ctx->rkey_dec, dst, src,
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walk.iv, nblks);
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dst += nblks * SM4_BLOCK_SIZE;
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src += nblks * SM4_BLOCK_SIZE;
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nbytes -= nblks * SM4_BLOCK_SIZE;
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}
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nblks = BYTES2BLKS(nbytes);
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if (nblks) {
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u8 keystream[SM4_BLOCK_SIZE * 8];
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u8 iv[SM4_BLOCK_SIZE];
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int i;
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sm4_neon_crypt_blk1_8(ctx->rkey_dec, keystream,
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src, nblks);
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src += ((int)nblks - 2) * SM4_BLOCK_SIZE;
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dst += (nblks - 1) * SM4_BLOCK_SIZE;
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memcpy(iv, src + SM4_BLOCK_SIZE, SM4_BLOCK_SIZE);
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for (i = nblks - 1; i > 0; i--) {
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crypto_xor_cpy(dst, src,
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&keystream[i * SM4_BLOCK_SIZE],
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SM4_BLOCK_SIZE);
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src -= SM4_BLOCK_SIZE;
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dst -= SM4_BLOCK_SIZE;
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}
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crypto_xor_cpy(dst, walk.iv,
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keystream, SM4_BLOCK_SIZE);
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memcpy(walk.iv, iv, SM4_BLOCK_SIZE);
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nbytes -= nblks * SM4_BLOCK_SIZE;
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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 sm4_cfb_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 sm4_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_walk walk;
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unsigned int nbytes;
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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while ((nbytes = walk.nbytes) > 0) {
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u8 keystream[SM4_BLOCK_SIZE];
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const u8 *iv = walk.iv;
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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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while (nbytes >= SM4_BLOCK_SIZE) {
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sm4_crypt_block(ctx->rkey_enc, keystream, iv);
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crypto_xor_cpy(dst, src, keystream, SM4_BLOCK_SIZE);
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iv = dst;
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src += SM4_BLOCK_SIZE;
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dst += SM4_BLOCK_SIZE;
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nbytes -= SM4_BLOCK_SIZE;
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}
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if (iv != walk.iv)
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memcpy(walk.iv, iv, SM4_BLOCK_SIZE);
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/* tail */
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if (walk.nbytes == walk.total && nbytes > 0) {
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sm4_crypt_block(ctx->rkey_enc, keystream, walk.iv);
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crypto_xor_cpy(dst, src, keystream, nbytes);
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nbytes = 0;
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}
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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 sm4_cfb_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 sm4_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_walk walk;
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unsigned int nbytes;
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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while ((nbytes = walk.nbytes) > 0) {
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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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unsigned int nblks;
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kernel_neon_begin();
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nblks = BYTES2BLK8(nbytes);
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if (nblks) {
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sm4_neon_cfb_dec_blk8(ctx->rkey_enc, dst, src,
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walk.iv, nblks);
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dst += nblks * SM4_BLOCK_SIZE;
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src += nblks * SM4_BLOCK_SIZE;
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nbytes -= nblks * SM4_BLOCK_SIZE;
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}
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nblks = BYTES2BLKS(nbytes);
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if (nblks) {
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u8 keystream[SM4_BLOCK_SIZE * 8];
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memcpy(keystream, walk.iv, SM4_BLOCK_SIZE);
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if (nblks > 1)
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memcpy(&keystream[SM4_BLOCK_SIZE], src,
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(nblks - 1) * SM4_BLOCK_SIZE);
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memcpy(walk.iv, src + (nblks - 1) * SM4_BLOCK_SIZE,
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SM4_BLOCK_SIZE);
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sm4_neon_crypt_blk1_8(ctx->rkey_enc, keystream,
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keystream, nblks);
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crypto_xor_cpy(dst, src, keystream,
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nblks * SM4_BLOCK_SIZE);
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dst += nblks * SM4_BLOCK_SIZE;
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src += nblks * SM4_BLOCK_SIZE;
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nbytes -= nblks * SM4_BLOCK_SIZE;
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}
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kernel_neon_end();
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/* tail */
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if (walk.nbytes == walk.total && nbytes > 0) {
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u8 keystream[SM4_BLOCK_SIZE];
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sm4_crypt_block(ctx->rkey_enc, keystream, walk.iv);
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crypto_xor_cpy(dst, src, keystream, nbytes);
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nbytes = 0;
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}
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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 sm4_ctr_crypt(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 sm4_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_walk walk;
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unsigned int nbytes;
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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while ((nbytes = walk.nbytes) > 0) {
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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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unsigned int nblks;
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kernel_neon_begin();
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nblks = BYTES2BLK8(nbytes);
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if (nblks) {
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sm4_neon_ctr_enc_blk8(ctx->rkey_enc, dst, src,
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walk.iv, nblks);
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dst += nblks * SM4_BLOCK_SIZE;
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src += nblks * SM4_BLOCK_SIZE;
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nbytes -= nblks * SM4_BLOCK_SIZE;
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}
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nblks = BYTES2BLKS(nbytes);
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if (nblks) {
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u8 keystream[SM4_BLOCK_SIZE * 8];
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int i;
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for (i = 0; i < nblks; i++) {
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memcpy(&keystream[i * SM4_BLOCK_SIZE],
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walk.iv, SM4_BLOCK_SIZE);
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crypto_inc(walk.iv, SM4_BLOCK_SIZE);
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}
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sm4_neon_crypt_blk1_8(ctx->rkey_enc, keystream,
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keystream, nblks);
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crypto_xor_cpy(dst, src, keystream,
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nblks * SM4_BLOCK_SIZE);
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dst += nblks * SM4_BLOCK_SIZE;
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src += nblks * SM4_BLOCK_SIZE;
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nbytes -= nblks * SM4_BLOCK_SIZE;
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}
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kernel_neon_end();
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/* tail */
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if (walk.nbytes == walk.total && nbytes > 0) {
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u8 keystream[SM4_BLOCK_SIZE];
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sm4_crypt_block(ctx->rkey_enc, keystream, walk.iv);
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crypto_inc(walk.iv, SM4_BLOCK_SIZE);
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crypto_xor_cpy(dst, src, keystream, nbytes);
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nbytes = 0;
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}
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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 struct skcipher_alg sm4_algs[] = {
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{
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.base = {
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.cra_name = "ecb(sm4)",
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.cra_driver_name = "ecb-sm4-neon",
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.cra_priority = 200,
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.cra_blocksize = SM4_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct sm4_ctx),
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.cra_module = THIS_MODULE,
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},
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.min_keysize = SM4_KEY_SIZE,
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.max_keysize = SM4_KEY_SIZE,
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.setkey = sm4_setkey,
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.encrypt = sm4_ecb_encrypt,
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.decrypt = sm4_ecb_decrypt,
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}, {
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.base = {
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.cra_name = "cbc(sm4)",
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.cra_driver_name = "cbc-sm4-neon",
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.cra_priority = 200,
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.cra_blocksize = SM4_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct sm4_ctx),
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.cra_module = THIS_MODULE,
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},
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.min_keysize = SM4_KEY_SIZE,
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.max_keysize = SM4_KEY_SIZE,
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.ivsize = SM4_BLOCK_SIZE,
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.setkey = sm4_setkey,
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.encrypt = sm4_cbc_encrypt,
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.decrypt = sm4_cbc_decrypt,
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}, {
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.base = {
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.cra_name = "cfb(sm4)",
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.cra_driver_name = "cfb-sm4-neon",
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.cra_priority = 200,
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.cra_blocksize = 1,
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.cra_ctxsize = sizeof(struct sm4_ctx),
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.cra_module = THIS_MODULE,
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},
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.min_keysize = SM4_KEY_SIZE,
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.max_keysize = SM4_KEY_SIZE,
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.ivsize = SM4_BLOCK_SIZE,
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.chunksize = SM4_BLOCK_SIZE,
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.setkey = sm4_setkey,
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.encrypt = sm4_cfb_encrypt,
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.decrypt = sm4_cfb_decrypt,
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}, {
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.base = {
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.cra_name = "ctr(sm4)",
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.cra_driver_name = "ctr-sm4-neon",
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.cra_priority = 200,
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.cra_blocksize = 1,
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.cra_ctxsize = sizeof(struct sm4_ctx),
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.cra_module = THIS_MODULE,
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},
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.min_keysize = SM4_KEY_SIZE,
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.max_keysize = SM4_KEY_SIZE,
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.ivsize = SM4_BLOCK_SIZE,
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.chunksize = SM4_BLOCK_SIZE,
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.setkey = sm4_setkey,
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.encrypt = sm4_ctr_crypt,
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.decrypt = sm4_ctr_crypt,
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}
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};
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static int __init sm4_init(void)
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{
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return crypto_register_skciphers(sm4_algs, ARRAY_SIZE(sm4_algs));
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}
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static void __exit sm4_exit(void)
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{
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crypto_unregister_skciphers(sm4_algs, ARRAY_SIZE(sm4_algs));
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}
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module_init(sm4_init);
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module_exit(sm4_exit);
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MODULE_DESCRIPTION("SM4 ECB/CBC/CFB/CTR using ARMv8 NEON");
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MODULE_ALIAS_CRYPTO("sm4-neon");
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MODULE_ALIAS_CRYPTO("sm4");
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MODULE_ALIAS_CRYPTO("ecb(sm4)");
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MODULE_ALIAS_CRYPTO("cbc(sm4)");
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MODULE_ALIAS_CRYPTO("cfb(sm4)");
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MODULE_ALIAS_CRYPTO("ctr(sm4)");
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MODULE_AUTHOR("Tianjia Zhang <tianjia.zhang@linux.alibaba.com>");
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MODULE_LICENSE("GPL v2");
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