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crypto: riscv - add vector crypto accelerated AES-{ECB,CBC,CTR,XTS}

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Add implementations of AES-ECB, AES-CBC, AES-CTR, and AES-XTS, as well
as bare (single-block) AES, using the RISC-V vector crypto extensions.
The assembly code is derived from OpenSSL code (openssl/openssl#21923)
that was dual-licensed so that it could be reused in the kernel.
Nevertheless, the assembly has been significantly reworked for
integration with the kernel, for example by using regular .S files
instead of the so-called perlasm, using the assembler instead of bare
'.inst', greatly reducing code duplication, supporting AES-192, and
making the code use the same AES key structure as the C code.

Co-developed-by: Phoebe Chen <phoebe.chen@sifive.com>
Signed-off-by: Phoebe Chen <phoebe.chen@sifive.com>
Signed-off-by: Jerry Shih <jerry.shih@sifive.com>
Co-developed-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Link: https://lore.kernel.org/r/20240122002024.27477-5-ebiggers@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Jerry Shih 2024-01-21 16:19:15 -08:00 committed by Palmer Dabbelt
parent 178f385643
commit eb24af5d7a
No known key found for this signature in database
GPG Key ID: 2E1319F35FBB1889
7 changed files with 1364 additions and 0 deletions
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16
arch/riscv/crypto/Kconfig
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menu "Accelerated Cryptographic Algorithms for CPU (riscv)"
config CRYPTO_AES_RISCV64
tristate "Ciphers: AES, modes: ECB, CBC, CTR, XTS"
depends on 64BIT && RISCV_ISA_V && TOOLCHAIN_HAS_VECTOR_CRYPTO
select CRYPTO_ALGAPI
select CRYPTO_LIB_AES
select CRYPTO_SKCIPHER
help
Block cipher: AES cipher algorithms
Length-preserving ciphers: AES with ECB, CBC, CTR, XTS
Architecture: riscv64 using:
- Zvkned vector crypto extension
- Zvbb vector extension (XTS)
- Zvkb vector crypto extension (CTR)
- Zvkg vector crypto extension (XTS)
endmenu

4
arch/riscv/crypto/Makefile
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@ -1 +1,5 @@
# SPDX-License-Identifier: GPL-2.0-only
obj-$(CONFIG_CRYPTO_AES_RISCV64) += aes-riscv64.o
aes-riscv64-y := aes-riscv64-glue.o aes-riscv64-zvkned.o \
aes-riscv64-zvkned-zvbb-zvkg.o aes-riscv64-zvkned-zvkb.o

156
arch/riscv/crypto/aes-macros.S Normal file
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/* SPDX-License-Identifier: Apache-2.0 OR BSD-2-Clause */
//
// This file is dual-licensed, meaning that you can use it under your
// choice of either of the following two licenses:
//
// Copyright 2023 The OpenSSL Project Authors. All Rights Reserved.
//
// Licensed under the Apache License 2.0 (the "License"). You can obtain
// a copy in the file LICENSE in the source distribution or at
// https://www.openssl.org/source/license.html
//
// or
//
// Copyright (c) 2023, Christoph Müllner <christoph.muellner@vrull.eu>
// Copyright (c) 2023, Phoebe Chen <phoebe.chen@sifive.com>
// Copyright (c) 2023, Jerry Shih <jerry.shih@sifive.com>
// Copyright 2024 Google LLC
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// This file contains macros that are shared by the other aes-*.S files. The
// generated code of these macros depends on the following RISC-V extensions:
// - RV64I
// - RISC-V Vector ('V') with VLEN >= 128
// - RISC-V Vector AES block cipher extension ('Zvkned')
// Loads the AES round keys from \keyp into vector registers and jumps to code
// specific to the length of the key. Specifically:
// - If AES-128, loads round keys into v1-v11 and jumps to \label128.
// - If AES-192, loads round keys into v1-v13 and jumps to \label192.
// - If AES-256, loads round keys into v1-v15 and continues onwards.
//
// Also sets vl=4 and vtype=e32,m1,ta,ma. Clobbers t0 and t1.
.macro aes_begin keyp, label128, label192
lwu t0, 480(\keyp) // t0 = key length in bytes
li t1, 24 // t1 = key length for AES-192
vsetivli zero, 4, e32, m1, ta, ma
vle32.v v1, (\keyp)
addi \keyp, \keyp, 16
vle32.v v2, (\keyp)
addi \keyp, \keyp, 16
vle32.v v3, (\keyp)
addi \keyp, \keyp, 16
vle32.v v4, (\keyp)
addi \keyp, \keyp, 16
vle32.v v5, (\keyp)
addi \keyp, \keyp, 16
vle32.v v6, (\keyp)
addi \keyp, \keyp, 16
vle32.v v7, (\keyp)
addi \keyp, \keyp, 16
vle32.v v8, (\keyp)
addi \keyp, \keyp, 16
vle32.v v9, (\keyp)
addi \keyp, \keyp, 16
vle32.v v10, (\keyp)
addi \keyp, \keyp, 16
vle32.v v11, (\keyp)
blt t0, t1, \label128 // If AES-128, goto label128.
addi \keyp, \keyp, 16
vle32.v v12, (\keyp)
addi \keyp, \keyp, 16
vle32.v v13, (\keyp)
beq t0, t1, \label192 // If AES-192, goto label192.
// Else, it's AES-256.
addi \keyp, \keyp, 16
vle32.v v14, (\keyp)
addi \keyp, \keyp, 16
vle32.v v15, (\keyp)
.endm
// Encrypts \data using zvkned instructions, using the round keys loaded into
// v1-v11 (for AES-128), v1-v13 (for AES-192), or v1-v15 (for AES-256). \keylen
// is the AES key length in bits. vl and vtype must already be set
// appropriately. Note that if vl > 4, multiple blocks are encrypted.
.macro aes_encrypt data, keylen
vaesz.vs \data, v1
vaesem.vs \data, v2
vaesem.vs \data, v3
vaesem.vs \data, v4
vaesem.vs \data, v5
vaesem.vs \data, v6
vaesem.vs \data, v7
vaesem.vs \data, v8
vaesem.vs \data, v9
vaesem.vs \data, v10
.if \keylen == 128
vaesef.vs \data, v11
.elseif \keylen == 192
vaesem.vs \data, v11
vaesem.vs \data, v12
vaesef.vs \data, v13
.else
vaesem.vs \data, v11
vaesem.vs \data, v12
vaesem.vs \data, v13
vaesem.vs \data, v14
vaesef.vs \data, v15
.endif
.endm
// Same as aes_encrypt, but decrypts instead of encrypts.
.macro aes_decrypt data, keylen
.if \keylen == 128
vaesz.vs \data, v11
.elseif \keylen == 192
vaesz.vs \data, v13
vaesdm.vs \data, v12
vaesdm.vs \data, v11
.else
vaesz.vs \data, v15
vaesdm.vs \data, v14
vaesdm.vs \data, v13
vaesdm.vs \data, v12
vaesdm.vs \data, v11
.endif
vaesdm.vs \data, v10
vaesdm.vs \data, v9
vaesdm.vs \data, v8
vaesdm.vs \data, v7
vaesdm.vs \data, v6
vaesdm.vs \data, v5
vaesdm.vs \data, v4
vaesdm.vs \data, v3
vaesdm.vs \data, v2
vaesdf.vs \data, v1
.endm
// Expands to aes_encrypt or aes_decrypt according to \enc, which is 1 or 0.
.macro aes_crypt data, enc, keylen
.if \enc
aes_encrypt \data, \keylen
.else
aes_decrypt \data, \keylen
.endif
.endm

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arch/riscv/crypto/aes-riscv64-glue.c Normal file
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// SPDX-License-Identifier: GPL-2.0-only
/*
* AES using the RISC-V vector crypto extensions. Includes the bare block
* cipher and the ECB, CBC, CTR, and XTS modes.
*
* Copyright (C) 2023 VRULL GmbH
* Author: Heiko Stuebner <heiko.stuebner@vrull.eu>
*
* Copyright (C) 2023 SiFive, Inc.
* Author: Jerry Shih <jerry.shih@sifive.com>
*/
#include <asm/simd.h>
#include <asm/vector.h>
#include <crypto/aes.h>
#include <crypto/internal/cipher.h>
#include <crypto/internal/simd.h>
#include <crypto/internal/skcipher.h>
#include <crypto/scatterwalk.h>
#include <crypto/xts.h>
#include <linux/linkage.h>
#include <linux/module.h>
asmlinkage void aes_encrypt_zvkned(const struct crypto_aes_ctx *key,
const u8 in[AES_BLOCK_SIZE],
u8 out[AES_BLOCK_SIZE]);
asmlinkage void aes_decrypt_zvkned(const struct crypto_aes_ctx *key,
const u8 in[AES_BLOCK_SIZE],
u8 out[AES_BLOCK_SIZE]);
asmlinkage void aes_ecb_encrypt_zvkned(const struct crypto_aes_ctx *key,
const u8 *in, u8 *out, size_t len);
asmlinkage void aes_ecb_decrypt_zvkned(const struct crypto_aes_ctx *key,
const u8 *in, u8 *out, size_t len);
asmlinkage void aes_cbc_encrypt_zvkned(const struct crypto_aes_ctx *key,
const u8 *in, u8 *out, size_t len,
u8 iv[AES_BLOCK_SIZE]);
asmlinkage void aes_cbc_decrypt_zvkned(const struct crypto_aes_ctx *key,
const u8 *in, u8 *out, size_t len,
u8 iv[AES_BLOCK_SIZE]);
asmlinkage void aes_ctr32_crypt_zvkned_zvkb(const struct crypto_aes_ctx *key,
const u8 *in, u8 *out, size_t len,
u8 iv[AES_BLOCK_SIZE]);
asmlinkage void aes_xts_encrypt_zvkned_zvbb_zvkg(
const struct crypto_aes_ctx *key,
const u8 *in, u8 *out, size_t len,
u8 tweak[AES_BLOCK_SIZE]);
asmlinkage void aes_xts_decrypt_zvkned_zvbb_zvkg(
const struct crypto_aes_ctx *key,
const u8 *in, u8 *out, size_t len,
u8 tweak[AES_BLOCK_SIZE]);
static int riscv64_aes_setkey(struct crypto_aes_ctx *ctx,
const u8 *key, unsigned int keylen)
{
/*
* For now we just use the generic key expansion, for these reasons:
*
* - zvkned's key expansion instructions don't support AES-192.
* So, non-zvkned fallback code would be needed anyway.
*
* - Users of AES in Linux usually don't change keys frequently.
* So, key expansion isn't performance-critical.
*
* - For single-block AES exposed as a "cipher" algorithm, it's
* necessary to use struct crypto_aes_ctx and initialize its 'key_dec'
* field with the round keys for the Equivalent Inverse Cipher. This
* is because with "cipher", decryption can be requested from a
* context where the vector unit isn't usable, necessitating a
* fallback to aes_decrypt(). But, zvkned can only generate and use
* the normal round keys. Of course, it's preferable to not have
* special code just for "cipher", as e.g. XTS also uses a
* single-block AES encryption. It's simplest to just use
* struct crypto_aes_ctx and aes_expandkey() everywhere.
*/
return aes_expandkey(ctx, key, keylen);
}
static int riscv64_aes_setkey_cipher(struct crypto_tfm *tfm,
const u8 *key, unsigned int keylen)
{
struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
return riscv64_aes_setkey(ctx, key, keylen);
}
static int riscv64_aes_setkey_skcipher(struct crypto_skcipher *tfm,
const u8 *key, unsigned int keylen)
{
struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
return riscv64_aes_setkey(ctx, key, keylen);
}
/* Bare AES, without a mode of operation */
static void riscv64_aes_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
const struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
if (crypto_simd_usable()) {
kernel_vector_begin();
aes_encrypt_zvkned(ctx, src, dst);
kernel_vector_end();
} else {
aes_encrypt(ctx, dst, src);
}
}
static void riscv64_aes_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
const struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
if (crypto_simd_usable()) {
kernel_vector_begin();
aes_decrypt_zvkned(ctx, src, dst);
kernel_vector_end();
} else {
aes_decrypt(ctx, dst, src);
}
}
/* AES-ECB */
static inline int riscv64_aes_ecb_crypt(struct skcipher_request *req, bool enc)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
const struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
struct skcipher_walk walk;
unsigned int nbytes;
int err;
err = skcipher_walk_virt(&walk, req, false);
while ((nbytes = walk.nbytes) != 0) {
kernel_vector_begin();
if (enc)
aes_ecb_encrypt_zvkned(ctx, walk.src.virt.addr,
walk.dst.virt.addr,
nbytes & ~(AES_BLOCK_SIZE - 1));
else
aes_ecb_decrypt_zvkned(ctx, walk.src.virt.addr,
walk.dst.virt.addr,
nbytes & ~(AES_BLOCK_SIZE - 1));
kernel_vector_end();
err = skcipher_walk_done(&walk, nbytes & (AES_BLOCK_SIZE - 1));
}
return err;
}
static int riscv64_aes_ecb_encrypt(struct skcipher_request *req)
{
return riscv64_aes_ecb_crypt(req, true);
}
static int riscv64_aes_ecb_decrypt(struct skcipher_request *req)
{
return riscv64_aes_ecb_crypt(req, false);
}
/* AES-CBC */
static inline int riscv64_aes_cbc_crypt(struct skcipher_request *req, bool enc)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
const struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
struct skcipher_walk walk;
unsigned int nbytes;
int err;
err = skcipher_walk_virt(&walk, req, false);
while ((nbytes = walk.nbytes) != 0) {
kernel_vector_begin();
if (enc)
aes_cbc_encrypt_zvkned(ctx, walk.src.virt.addr,
walk.dst.virt.addr,
nbytes & ~(AES_BLOCK_SIZE - 1),
walk.iv);
else
aes_cbc_decrypt_zvkned(ctx, walk.src.virt.addr,
walk.dst.virt.addr,
nbytes & ~(AES_BLOCK_SIZE - 1),
walk.iv);
kernel_vector_end();
err = skcipher_walk_done(&walk, nbytes & (AES_BLOCK_SIZE - 1));
}
return err;
}
static int riscv64_aes_cbc_encrypt(struct skcipher_request *req)
{
return riscv64_aes_cbc_crypt(req, true);
}
static int riscv64_aes_cbc_decrypt(struct skcipher_request *req)
{
return riscv64_aes_cbc_crypt(req, false);
}
/* AES-CTR */
static int riscv64_aes_ctr_crypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
const struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
unsigned int nbytes, p1_nbytes;
struct skcipher_walk walk;
u32 ctr32, nblocks;
int err;
/* Get the low 32-bit word of the 128-bit big endian counter. */
ctr32 = get_unaligned_be32(req->iv + 12);
err = skcipher_walk_virt(&walk, req, false);
while ((nbytes = walk.nbytes) != 0) {
if (nbytes < walk.total) {
/* Not the end yet, so keep the length block-aligned. */
nbytes = round_down(nbytes, AES_BLOCK_SIZE);
nblocks = nbytes / AES_BLOCK_SIZE;
} else {
/* It's the end, so include any final partial block. */
nblocks = DIV_ROUND_UP(nbytes, AES_BLOCK_SIZE);
}
ctr32 += nblocks;
kernel_vector_begin();
if (ctr32 >= nblocks) {
/* The low 32-bit word of the counter won't overflow. */
aes_ctr32_crypt_zvkned_zvkb(ctx, walk.src.virt.addr,
walk.dst.virt.addr, nbytes,
req->iv);
} else {
/*
* The low 32-bit word of the counter will overflow.
* The assembly doesn't handle this case, so split the
* operation into two at the point where the overflow
* will occur. After the first part, add the carry bit.
*/
p1_nbytes = min_t(unsigned int, nbytes,
(nblocks - ctr32) * AES_BLOCK_SIZE);
aes_ctr32_crypt_zvkned_zvkb(ctx, walk.src.virt.addr,
walk.dst.virt.addr,
p1_nbytes, req->iv);
crypto_inc(req->iv, 12);
if (ctr32) {
aes_ctr32_crypt_zvkned_zvkb(
ctx,
walk.src.virt.addr + p1_nbytes,
walk.dst.virt.addr + p1_nbytes,
nbytes - p1_nbytes, req->iv);
}
}
kernel_vector_end();
err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
}
return err;
}
/* AES-XTS */
struct riscv64_aes_xts_ctx {
struct crypto_aes_ctx ctx1;
struct crypto_aes_ctx ctx2;
};
static int riscv64_aes_xts_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keylen)
{
struct riscv64_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
return xts_verify_key(tfm, key, keylen) ?:
riscv64_aes_setkey(&ctx->ctx1, key, keylen / 2) ?:
riscv64_aes_setkey(&ctx->ctx2, key + keylen / 2, keylen / 2);
}
static int riscv64_aes_xts_crypt(struct skcipher_request *req, bool enc)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
const struct riscv64_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
int tail = req->cryptlen % AES_BLOCK_SIZE;
struct scatterlist sg_src[2], sg_dst[2];
struct skcipher_request subreq;
struct scatterlist *src, *dst;
struct skcipher_walk walk;
int err;
if (req->cryptlen < AES_BLOCK_SIZE)
return -EINVAL;
/* Encrypt the IV with the tweak key to get the first tweak. */
kernel_vector_begin();
aes_encrypt_zvkned(&ctx->ctx2, req->iv, req->iv);
kernel_vector_end();
err = skcipher_walk_virt(&walk, req, false);
/*
* If the message length isn't divisible by the AES block size and the
* full message isn't available in one step of the scatterlist walk,
* then separate off the last full block and the partial block. This
* ensures that they are processed in the same call to the assembly
* function, which is required for ciphertext stealing.
*/
if (unlikely(tail > 0 && walk.nbytes < walk.total)) {
skcipher_walk_abort(&walk);
skcipher_request_set_tfm(&subreq, tfm);
skcipher_request_set_callback(&subreq,
skcipher_request_flags(req),
NULL, NULL);
skcipher_request_set_crypt(&subreq, req->src, req->dst,
req->cryptlen - tail - AES_BLOCK_SIZE,
req->iv);
req = &subreq;
err = skcipher_walk_virt(&walk, req, false);
} else {
tail = 0;
}
while (walk.nbytes) {
unsigned int nbytes = walk.nbytes;
if (nbytes < walk.total)
nbytes = round_down(nbytes, AES_BLOCK_SIZE);
kernel_vector_begin();
if (enc)
aes_xts_encrypt_zvkned_zvbb_zvkg(
&ctx->ctx1, walk.src.virt.addr,
walk.dst.virt.addr, nbytes, req->iv);
else
aes_xts_decrypt_zvkned_zvbb_zvkg(
&ctx->ctx1, walk.src.virt.addr,
walk.dst.virt.addr, nbytes, req->iv);
kernel_vector_end();
err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
}
if (err || likely(!tail))
return err;
/* Do ciphertext stealing with the last full block and partial block. */
dst = src = scatterwalk_ffwd(sg_src, req->src, req->cryptlen);
if (req->dst != req->src)
dst = scatterwalk_ffwd(sg_dst, req->dst, req->cryptlen);
skcipher_request_set_crypt(req, src, dst, AES_BLOCK_SIZE + tail,
req->iv);
err = skcipher_walk_virt(&walk, req, false);
if (err)
return err;
kernel_vector_begin();
if (enc)
aes_xts_encrypt_zvkned_zvbb_zvkg(
&ctx->ctx1, walk.src.virt.addr,
walk.dst.virt.addr, walk.nbytes, req->iv);
else
aes_xts_decrypt_zvkned_zvbb_zvkg(
&ctx->ctx1, walk.src.virt.addr,
walk.dst.virt.addr, walk.nbytes, req->iv);
kernel_vector_end();
return skcipher_walk_done(&walk, 0);
}
static int riscv64_aes_xts_encrypt(struct skcipher_request *req)
{
return riscv64_aes_xts_crypt(req, true);
}
static int riscv64_aes_xts_decrypt(struct skcipher_request *req)
{
return riscv64_aes_xts_crypt(req, false);
}
/* Algorithm definitions */
static struct crypto_alg riscv64_zvkned_aes_cipher_alg = {
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct crypto_aes_ctx),
.cra_priority = 300,
.cra_name = "aes",
.cra_driver_name = "aes-riscv64-zvkned",
.cra_cipher = {
.cia_min_keysize = AES_MIN_KEY_SIZE,
.cia_max_keysize = AES_MAX_KEY_SIZE,
.cia_setkey = riscv64_aes_setkey_cipher,
.cia_encrypt = riscv64_aes_encrypt,
.cia_decrypt = riscv64_aes_decrypt,
},
.cra_module = THIS_MODULE,
};
static struct skcipher_alg riscv64_zvkned_aes_skcipher_algs[] = {
{
.setkey = riscv64_aes_setkey_skcipher,
.encrypt = riscv64_aes_ecb_encrypt,
.decrypt = riscv64_aes_ecb_decrypt,
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.walksize = 8 * AES_BLOCK_SIZE, /* matches LMUL=8 */
.base = {
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct crypto_aes_ctx),
.cra_priority = 300,
.cra_name = "ecb(aes)",
.cra_driver_name = "ecb-aes-riscv64-zvkned",
.cra_module = THIS_MODULE,
},
}, {
.setkey = riscv64_aes_setkey_skcipher,
.encrypt = riscv64_aes_cbc_encrypt,
.decrypt = riscv64_aes_cbc_decrypt,
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
.base = {
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct crypto_aes_ctx),
.cra_priority = 300,
.cra_name = "cbc(aes)",
.cra_driver_name = "cbc-aes-riscv64-zvkned",
.cra_module = THIS_MODULE,
},
}
};
static struct skcipher_alg riscv64_zvkned_zvkb_aes_skcipher_alg = {
.setkey = riscv64_aes_setkey_skcipher,
.encrypt = riscv64_aes_ctr_crypt,
.decrypt = riscv64_aes_ctr_crypt,
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
.chunksize = AES_BLOCK_SIZE,
.walksize = 4 * AES_BLOCK_SIZE, /* matches LMUL=4 */
.base = {
.cra_blocksize = 1,
.cra_ctxsize = sizeof(struct crypto_aes_ctx),
.cra_priority = 300,
.cra_name = "ctr(aes)",
.cra_driver_name = "ctr-aes-riscv64-zvkned-zvkb",
.cra_module = THIS_MODULE,
},
};
static struct skcipher_alg riscv64_zvkned_zvbb_zvkg_aes_skcipher_alg = {
.setkey = riscv64_aes_xts_setkey,
.encrypt = riscv64_aes_xts_encrypt,
.decrypt = riscv64_aes_xts_decrypt,
.min_keysize = 2 * AES_MIN_KEY_SIZE,
.max_keysize = 2 * AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
.chunksize = AES_BLOCK_SIZE,
.walksize = 4 * AES_BLOCK_SIZE, /* matches LMUL=4 */
.base = {
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct riscv64_aes_xts_ctx),
.cra_priority = 300,
.cra_name = "xts(aes)",
.cra_driver_name = "xts-aes-riscv64-zvkned-zvbb-zvkg",
.cra_module = THIS_MODULE,
},
};
static inline bool riscv64_aes_xts_supported(void)
{
return riscv_isa_extension_available(NULL, ZVBB) &&
riscv_isa_extension_available(NULL, ZVKG) &&
riscv_vector_vlen() < 2048 /* Implementation limitation */;
}
static int __init riscv64_aes_mod_init(void)
{
int err = -ENODEV;
if (riscv_isa_extension_available(NULL, ZVKNED) &&
riscv_vector_vlen() >= 128) {
err = crypto_register_alg(&riscv64_zvkned_aes_cipher_alg);
if (err)
return err;
err = crypto_register_skciphers(
riscv64_zvkned_aes_skcipher_algs,
ARRAY_SIZE(riscv64_zvkned_aes_skcipher_algs));
if (err)
goto unregister_zvkned_cipher_alg;
if (riscv_isa_extension_available(NULL, ZVKB)) {
err = crypto_register_skcipher(
&riscv64_zvkned_zvkb_aes_skcipher_alg);
if (err)
goto unregister_zvkned_skcipher_algs;
}
if (riscv64_aes_xts_supported()) {
err = crypto_register_skcipher(
&riscv64_zvkned_zvbb_zvkg_aes_skcipher_alg);
if (err)
goto unregister_zvkned_zvkb_skcipher_alg;
}
}
return err;
unregister_zvkned_zvkb_skcipher_alg:
if (riscv_isa_extension_available(NULL, ZVKB))
crypto_unregister_skcipher(&riscv64_zvkned_zvkb_aes_skcipher_alg);
unregister_zvkned_skcipher_algs:
crypto_unregister_skciphers(riscv64_zvkned_aes_skcipher_algs,
ARRAY_SIZE(riscv64_zvkned_aes_skcipher_algs));
unregister_zvkned_cipher_alg:
crypto_unregister_alg(&riscv64_zvkned_aes_cipher_alg);
return err;
}
static void __exit riscv64_aes_mod_exit(void)
{
if (riscv64_aes_xts_supported())
crypto_unregister_skcipher(&riscv64_zvkned_zvbb_zvkg_aes_skcipher_alg);
if (riscv_isa_extension_available(NULL, ZVKB))
crypto_unregister_skcipher(&riscv64_zvkned_zvkb_aes_skcipher_alg);
crypto_unregister_skciphers(riscv64_zvkned_aes_skcipher_algs,
ARRAY_SIZE(riscv64_zvkned_aes_skcipher_algs));
crypto_unregister_alg(&riscv64_zvkned_aes_cipher_alg);
}
module_init(riscv64_aes_mod_init);
module_exit(riscv64_aes_mod_exit);
MODULE_DESCRIPTION("AES-ECB/CBC/CTR/XTS (RISC-V accelerated)");
MODULE_AUTHOR("Jerry Shih <jerry.shih@sifive.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CRYPTO("aes");
MODULE_ALIAS_CRYPTO("ecb(aes)");
MODULE_ALIAS_CRYPTO("cbc(aes)");
MODULE_ALIAS_CRYPTO("ctr(aes)");
MODULE_ALIAS_CRYPTO("xts(aes)");

312
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/* SPDX-License-Identifier: Apache-2.0 OR BSD-2-Clause */
//
// This file is dual-licensed, meaning that you can use it under your
// choice of either of the following two licenses:
//
// Copyright 2023 The OpenSSL Project Authors. All Rights Reserved.
//
// Licensed under the Apache License 2.0 (the "License"). You can obtain
// a copy in the file LICENSE in the source distribution or at
// https://www.openssl.org/source/license.html
//
// or
//
// Copyright (c) 2023, Jerry Shih <jerry.shih@sifive.com>
// Copyright 2024 Google LLC
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// The generated code of this file depends on the following RISC-V extensions:
// - RV64I
// - RISC-V Vector ('V') with VLEN >= 128 && VLEN < 2048
// - RISC-V Vector AES block cipher extension ('Zvkned')
// - RISC-V Vector Bit-manipulation extension ('Zvbb')
// - RISC-V Vector GCM/GMAC extension ('Zvkg')
#include <linux/linkage.h>
.text
.option arch, +zvkned, +zvbb, +zvkg
#include "aes-macros.S"
#define KEYP a0
#define INP a1
#define OUTP a2
#define LEN a3
#define TWEAKP a4
#define LEN32 a5
#define TAIL_LEN a6
#define VL a7
#define VLMAX t4
// v1-v15 contain the AES round keys, but they are used for temporaries before
// the AES round keys have been loaded.
#define TWEAKS v16 // LMUL=4 (most of the time)
#define TWEAKS_BREV v20 // LMUL=4 (most of the time)
#define MULTS_BREV v24 // LMUL=4 (most of the time)
#define TMP0 v28
#define TMP1 v29
#define TMP2 v30
#define TMP3 v31
// xts_init initializes the following values:
//
// TWEAKS: N 128-bit tweaks T*(x^i) for i in 0..(N - 1)
// TWEAKS_BREV: same as TWEAKS, but bit-reversed
// MULTS_BREV: N 128-bit values x^N, bit-reversed. Only if N > 1.
//
// N is the maximum number of blocks that will be processed per loop iteration,
// computed using vsetvli.
//
// The field convention used by XTS is the same as that of GHASH, but with the
// bits reversed within each byte. The zvkg extension provides the vgmul
// instruction which does multiplication in this field. Therefore, for tweak
// computation we use vgmul to do multiplications in parallel, instead of
// serially multiplying by x using shifting+xoring. Note that for this to work,
// the inputs and outputs to vgmul must be bit-reversed (we do it with vbrev8).
.macro xts_init
// Load the first tweak T.
vsetivli zero, 4, e32, m1, ta, ma
vle32.v TWEAKS, (TWEAKP)
// If there's only one block (or no blocks at all), then skip the tweak
// sequence computation because (at most) T itself is needed.
li t0, 16
ble LEN, t0, .Linit_single_block\@
// Save a copy of T bit-reversed in v12.
vbrev8.v v12, TWEAKS
//
// Generate x^i for i in 0..(N - 1), i.e. 128-bit values 1 << i assuming
// that N <= 128. Though, this code actually requires N < 64 (or
// equivalently VLEN < 2048) due to the use of 64-bit intermediate
// values here and in the x^N computation later.
//
vsetvli VL, LEN32, e32, m4, ta, ma
srli t0, VL, 2 // t0 = N (num blocks)
// Generate two sequences, each with N 32-bit values:
// v0=[1, 1, 1, ...] and v1=[0, 1, 2, ...].
vsetvli zero, t0, e32, m1, ta, ma
vmv.v.i v0, 1
vid.v v1
// Use vzext to zero-extend the sequences to 64 bits. Reinterpret them
// as two sequences, each with 2*N 32-bit values:
// v2=[1, 0, 1, 0, 1, 0, ...] and v4=[0, 0, 1, 0, 2, 0, ...].
vsetvli zero, t0, e64, m2, ta, ma
vzext.vf2 v2, v0
vzext.vf2 v4, v1
slli t1, t0, 1 // t1 = 2*N
vsetvli zero, t1, e32, m2, ta, ma
// Use vwsll to compute [1<<0, 0<<0, 1<<1, 0<<0, 1<<2, 0<<0, ...],
// widening to 64 bits per element. When reinterpreted as N 128-bit
// values, this is the needed sequence of 128-bit values 1 << i (x^i).
vwsll.vv v8, v2, v4
// Copy the bit-reversed T to all N elements of TWEAKS_BREV, then
// multiply by x^i. This gives the sequence T*(x^i), bit-reversed.
vsetvli zero, LEN32, e32, m4, ta, ma
vmv.v.i TWEAKS_BREV, 0
vaesz.vs TWEAKS_BREV, v12
vbrev8.v v8, v8
vgmul.vv TWEAKS_BREV, v8
// Save a copy of the sequence T*(x^i) with the bit reversal undone.
vbrev8.v TWEAKS, TWEAKS_BREV
// Generate N copies of x^N, i.e. 128-bit values 1 << N, bit-reversed.
li t1, 1
sll t1, t1, t0 // t1 = 1 << N
vsetivli zero, 2, e64, m1, ta, ma
vmv.v.i v0, 0
vsetivli zero, 1, e64, m1, tu, ma
vmv.v.x v0, t1
vbrev8.v v0, v0
vsetvli zero, LEN32, e32, m4, ta, ma
vmv.v.i MULTS_BREV, 0
vaesz.vs MULTS_BREV, v0
j .Linit_done\@
.Linit_single_block\@:
vbrev8.v TWEAKS_BREV, TWEAKS
.Linit_done\@:
.endm
// Set the first 128 bits of MULTS_BREV to 0x40, i.e. 'x' bit-reversed. This is
// the multiplier required to advance the tweak by one.
.macro load_x
li t0, 0x40
vsetivli zero, 4, e32, m1, ta, ma
vmv.v.i MULTS_BREV, 0
vsetivli zero, 1, e8, m1, tu, ma
vmv.v.x MULTS_BREV, t0
.endm
.macro __aes_xts_crypt enc, keylen
// With 16 < len <= 31, there's no main loop, just ciphertext stealing.
beqz LEN32, .Lcts_without_main_loop\@
vsetvli VLMAX, zero, e32, m4, ta, ma
1:
vsetvli VL, LEN32, e32, m4, ta, ma
2:
// Encrypt or decrypt VL/4 blocks.
vle32.v TMP0, (INP)
vxor.vv TMP0, TMP0, TWEAKS
aes_crypt TMP0, \enc, \keylen
vxor.vv TMP0, TMP0, TWEAKS
vse32.v TMP0, (OUTP)
// Update the pointers and the remaining length.
slli t0, VL, 2
add INP, INP, t0
add OUTP, OUTP, t0
sub LEN32, LEN32, VL
// Check whether more blocks remain.
beqz LEN32, .Lmain_loop_done\@
// Compute the next sequence of tweaks by multiplying the previous
// sequence by x^N. Store the result in both bit-reversed order and
// regular order (i.e. with the bit reversal undone).
vgmul.vv TWEAKS_BREV, MULTS_BREV
vbrev8.v TWEAKS, TWEAKS_BREV
// Since we compute the tweak multipliers x^N in advance, we require
// that each iteration process the same length except possibly the last.
// This conflicts slightly with the behavior allowed by RISC-V Vector
// Extension, where CPUs can select a lower length for both of the last
// two iterations. E.g., vl might take the sequence of values
// [16, 16, 16, 12, 12], whereas we need [16, 16, 16, 16, 8] so that we
// can use x^4 again instead of computing x^3. Therefore, we explicitly
// keep the vl at VLMAX if there is at least VLMAX remaining.
bge LEN32, VLMAX, 2b
j 1b
.Lmain_loop_done\@:
load_x
// Compute the next tweak.
addi t0, VL, -4
vsetivli zero, 4, e32, m4, ta, ma
vslidedown.vx TWEAKS_BREV, TWEAKS_BREV, t0 // Extract last tweak
vsetivli zero, 4, e32, m1, ta, ma
vgmul.vv TWEAKS_BREV, MULTS_BREV // Advance to next tweak
bnez TAIL_LEN, .Lcts\@
// Update *TWEAKP to contain the next tweak.
vbrev8.v TWEAKS, TWEAKS_BREV
vse32.v TWEAKS, (TWEAKP)
ret
.Lcts_without_main_loop\@:
load_x
.Lcts\@:
// TWEAKS_BREV now contains the next tweak. Compute the one after that.
vsetivli zero, 4, e32, m1, ta, ma
vmv.v.v TMP0, TWEAKS_BREV
vgmul.vv TMP0, MULTS_BREV
// Undo the bit reversal of the next two tweaks and store them in TMP1
// and TMP2, such that TMP1 is the first needed and TMP2 the second.
.if \enc
vbrev8.v TMP1, TWEAKS_BREV
vbrev8.v TMP2, TMP0
.else
vbrev8.v TMP1, TMP0
vbrev8.v TMP2, TWEAKS_BREV
.endif
// Encrypt/decrypt the last full block.
vle32.v TMP0, (INP)
vxor.vv TMP0, TMP0, TMP1
aes_crypt TMP0, \enc, \keylen
vxor.vv TMP0, TMP0, TMP1
// Swap the first TAIL_LEN bytes of the above result with the tail.
// Note that to support in-place encryption/decryption, the load from
// the input tail must happen before the store to the output tail.
addi t0, INP, 16
addi t1, OUTP, 16
vmv.v.v TMP3, TMP0
vsetvli zero, TAIL_LEN, e8, m1, tu, ma
vle8.v TMP0, (t0)
vse8.v TMP3, (t1)
// Encrypt/decrypt again and store the last full block.
vsetivli zero, 4, e32, m1, ta, ma
vxor.vv TMP0, TMP0, TMP2
aes_crypt TMP0, \enc, \keylen
vxor.vv TMP0, TMP0, TMP2
vse32.v TMP0, (OUTP)
ret
.endm
.macro aes_xts_crypt enc
// Check whether the length is a multiple of the AES block size.
andi TAIL_LEN, LEN, 15
beqz TAIL_LEN, 1f
// The length isn't a multiple of the AES block size, so ciphertext
// stealing will be required. Ciphertext stealing involves special
// handling of the partial block and the last full block, so subtract
// the length of both from the length to be processed in the main loop.
sub LEN, LEN, TAIL_LEN
addi LEN, LEN, -16
1:
srli LEN32, LEN, 2
// LEN and LEN32 now contain the total length of the blocks that will be
// processed in the main loop, in bytes and 32-bit words respectively.
xts_init
aes_begin KEYP, 128f, 192f
__aes_xts_crypt \enc, 256
128:
__aes_xts_crypt \enc, 128
192:
__aes_xts_crypt \enc, 192
.endm
// void aes_xts_encrypt_zvkned_zvbb_zvkg(const struct crypto_aes_ctx *key,
// const u8 *in, u8 *out, size_t len,
// u8 tweak[16]);
//
// |key| is the data key. |tweak| contains the next tweak; the encryption of
// the original IV with the tweak key was already done. This function supports
// incremental computation, but |len| must always be >= 16 (AES_BLOCK_SIZE), and
// |len| must be a multiple of 16 except on the last call. If |len| is a
// multiple of 16, then this function updates |tweak| to contain the next tweak.
SYM_FUNC_START(aes_xts_encrypt_zvkned_zvbb_zvkg)
aes_xts_crypt 1
SYM_FUNC_END(aes_xts_encrypt_zvkned_zvbb_zvkg)
// Same prototype and calling convention as the encryption function
SYM_FUNC_START(aes_xts_decrypt_zvkned_zvbb_zvkg)
aes_xts_crypt 0
SYM_FUNC_END(aes_xts_decrypt_zvkned_zvbb_zvkg)

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/* SPDX-License-Identifier: Apache-2.0 OR BSD-2-Clause */
//
// This file is dual-licensed, meaning that you can use it under your
// choice of either of the following two licenses:
//
// Copyright 2023 The OpenSSL Project Authors. All Rights Reserved.
//
// Licensed under the Apache License 2.0 (the "License"). You can obtain
// a copy in the file LICENSE in the source distribution or at
// https://www.openssl.org/source/license.html
//
// or
//
// Copyright (c) 2023, Jerry Shih <jerry.shih@sifive.com>
// Copyright 2024 Google LLC
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// The generated code of this file depends on the following RISC-V extensions:
// - RV64I
// - RISC-V Vector ('V') with VLEN >= 128
// - RISC-V Vector AES block cipher extension ('Zvkned')
// - RISC-V Vector Cryptography Bit-manipulation extension ('Zvkb')
#include <linux/linkage.h>
.text
.option arch, +zvkned, +zvkb
#include "aes-macros.S"
#define KEYP a0
#define INP a1
#define OUTP a2
#define LEN a3
#define IVP a4
#define LEN32 a5
#define VL_E32 a6
#define VL_BLOCKS a7
.macro aes_ctr32_crypt keylen
// LEN32 = number of blocks, rounded up, in 32-bit words.
addi t0, LEN, 15
srli t0, t0, 4
slli LEN32, t0, 2
// Create a mask that selects the last 32-bit word of each 128-bit
// block. This is the word that contains the (big-endian) counter.
li t0, 0x88
vsetvli t1, zero, e8, m1, ta, ma
vmv.v.x v0, t0
// Load the IV into v31. The last 32-bit word contains the counter.
vsetivli zero, 4, e32, m1, ta, ma
vle32.v v31, (IVP)
// Convert the big-endian counter into little-endian.
vsetivli zero, 4, e32, m1, ta, mu
vrev8.v v31, v31, v0.t
// Splat the IV to v16 (with LMUL=4). The number of copies is the
// maximum number of blocks that will be processed per iteration.
vsetvli zero, LEN32, e32, m4, ta, ma
vmv.v.i v16, 0
vaesz.vs v16, v31
// v20 = [x, x, x, 0, x, x, x, 1, ...]
viota.m v20, v0, v0.t
// v16 = [IV0, IV1, IV2, counter+0, IV0, IV1, IV2, counter+1, ...]
vsetvli VL_E32, LEN32, e32, m4, ta, mu
vadd.vv v16, v16, v20, v0.t
j 2f
1:
// Set the number of blocks to process in this iteration. vl=VL_E32 is
// the length in 32-bit words, i.e. 4 times the number of blocks.
vsetvli VL_E32, LEN32, e32, m4, ta, mu
// Increment the counters by the number of blocks processed in the
// previous iteration.
vadd.vx v16, v16, VL_BLOCKS, v0.t
2:
// Prepare the AES inputs into v24.
vmv.v.v v24, v16
vrev8.v v24, v24, v0.t // Convert counters back to big-endian.
// Encrypt the AES inputs to create the next portion of the keystream.
aes_encrypt v24, \keylen
// XOR the data with the keystream.
vsetvli t0, LEN, e8, m4, ta, ma
vle8.v v20, (INP)
vxor.vv v20, v20, v24
vse8.v v20, (OUTP)
// Advance the pointers and update the remaining length.
add INP, INP, t0
add OUTP, OUTP, t0
sub LEN, LEN, t0
sub LEN32, LEN32, VL_E32
srli VL_BLOCKS, VL_E32, 2
// Repeat if more data remains.
bnez LEN, 1b
// Update *IVP to contain the next counter.
vsetivli zero, 4, e32, m1, ta, mu
vadd.vx v16, v16, VL_BLOCKS, v0.t
vrev8.v v16, v16, v0.t // Convert counters back to big-endian.
vse32.v v16, (IVP)
ret
.endm
// void aes_ctr32_crypt_zvkned_zvkb(const struct crypto_aes_ctx *key,
// const u8 *in, u8 *out, size_t len,
// u8 iv[16]);
SYM_FUNC_START(aes_ctr32_crypt_zvkned_zvkb)
aes_begin KEYP, 128f, 192f
aes_ctr32_crypt 256
128:
aes_ctr32_crypt 128
192:
aes_ctr32_crypt 192
SYM_FUNC_END(aes_ctr32_crypt_zvkned_zvkb)

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/* SPDX-License-Identifier: Apache-2.0 OR BSD-2-Clause */
//
// This file is dual-licensed, meaning that you can use it under your
// choice of either of the following two licenses:
//
// Copyright 2023 The OpenSSL Project Authors. All Rights Reserved.
//
// Licensed under the Apache License 2.0 (the "License"). You can obtain
// a copy in the file LICENSE in the source distribution or at
// https://www.openssl.org/source/license.html
//
// or
//
// Copyright (c) 2023, Christoph Müllner <christoph.muellner@vrull.eu>
// Copyright (c) 2023, Phoebe Chen <phoebe.chen@sifive.com>
// Copyright (c) 2023, Jerry Shih <jerry.shih@sifive.com>
// Copyright 2024 Google LLC
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// The generated code of this file depends on the following RISC-V extensions:
// - RV64I
// - RISC-V Vector ('V') with VLEN >= 128
// - RISC-V Vector AES block cipher extension ('Zvkned')
#include <linux/linkage.h>
.text
.option arch, +zvkned
#include "aes-macros.S"
#define KEYP a0
#define INP a1
#define OUTP a2
#define LEN a3
#define IVP a4
.macro __aes_crypt_zvkned enc, keylen
vle32.v v16, (INP)
aes_crypt v16, \enc, \keylen
vse32.v v16, (OUTP)
ret
.endm
.macro aes_crypt_zvkned enc
aes_begin KEYP, 128f, 192f
__aes_crypt_zvkned \enc, 256
128:
__aes_crypt_zvkned \enc, 128
192:
__aes_crypt_zvkned \enc, 192
.endm
// void aes_encrypt_zvkned(const struct crypto_aes_ctx *key,
// const u8 in[16], u8 out[16]);
SYM_FUNC_START(aes_encrypt_zvkned)
aes_crypt_zvkned 1
SYM_FUNC_END(aes_encrypt_zvkned)
// Same prototype and calling convention as the encryption function
SYM_FUNC_START(aes_decrypt_zvkned)
aes_crypt_zvkned 0
SYM_FUNC_END(aes_decrypt_zvkned)
.macro __aes_ecb_crypt enc, keylen
srli t0, LEN, 2
// t0 is the remaining length in 32-bit words. It's a multiple of 4.
1:
vsetvli t1, t0, e32, m8, ta, ma
sub t0, t0, t1 // Subtract number of words processed
slli t1, t1, 2 // Words to bytes
vle32.v v16, (INP)
aes_crypt v16, \enc, \keylen
vse32.v v16, (OUTP)
add INP, INP, t1
add OUTP, OUTP, t1
bnez t0, 1b
ret
.endm
.macro aes_ecb_crypt enc
aes_begin KEYP, 128f, 192f
__aes_ecb_crypt \enc, 256
128:
__aes_ecb_crypt \enc, 128
192:
__aes_ecb_crypt \enc, 192
.endm
// void aes_ecb_encrypt_zvkned(const struct crypto_aes_ctx *key,
// const u8 *in, u8 *out, size_t len);
//
// |len| must be nonzero and a multiple of 16 (AES_BLOCK_SIZE).
SYM_FUNC_START(aes_ecb_encrypt_zvkned)
aes_ecb_crypt 1
SYM_FUNC_END(aes_ecb_encrypt_zvkned)
// Same prototype and calling convention as the encryption function
SYM_FUNC_START(aes_ecb_decrypt_zvkned)
aes_ecb_crypt 0
SYM_FUNC_END(aes_ecb_decrypt_zvkned)
.macro aes_cbc_encrypt keylen
vle32.v v16, (IVP) // Load IV
1:
vle32.v v17, (INP) // Load plaintext block
vxor.vv v16, v16, v17 // XOR with IV or prev ciphertext block
aes_encrypt v16, \keylen // Encrypt
vse32.v v16, (OUTP) // Store ciphertext block
addi INP, INP, 16
addi OUTP, OUTP, 16
addi LEN, LEN, -16
bnez LEN, 1b
vse32.v v16, (IVP) // Store next IV
ret
.endm
.macro aes_cbc_decrypt keylen
vle32.v v16, (IVP) // Load IV
1:
vle32.v v17, (INP) // Load ciphertext block
vmv.v.v v18, v17 // Save ciphertext block
aes_decrypt v17, \keylen // Decrypt
vxor.vv v17, v17, v16 // XOR with IV or prev ciphertext block
vse32.v v17, (OUTP) // Store plaintext block
vmv.v.v v16, v18 // Next "IV" is prev ciphertext block
addi INP, INP, 16
addi OUTP, OUTP, 16
addi LEN, LEN, -16
bnez LEN, 1b
vse32.v v16, (IVP) // Store next IV
ret
.endm
// void aes_cbc_encrypt_zvkned(const struct crypto_aes_ctx *key,
// const u8 *in, u8 *out, size_t len, u8 iv[16]);
//
// |len| must be nonzero and a multiple of 16 (AES_BLOCK_SIZE).
SYM_FUNC_START(aes_cbc_encrypt_zvkned)
aes_begin KEYP, 128f, 192f
aes_cbc_encrypt 256
128:
aes_cbc_encrypt 128
192:
aes_cbc_encrypt 192
SYM_FUNC_END(aes_cbc_encrypt_zvkned)
// Same prototype and calling convention as the encryption function
SYM_FUNC_START(aes_cbc_decrypt_zvkned)
aes_begin KEYP, 128f, 192f
aes_cbc_decrypt 256
128:
aes_cbc_decrypt 128
192:
aes_cbc_decrypt 192
SYM_FUNC_END(aes_cbc_decrypt_zvkned)