mirror of
https://github.com/torvalds/linux.git
synced 2025-11-04 02:30:34 +02:00
4a5dc51e93
This module registers crc32 and crc32c algorithms that use the
optional CRC32[bhwd] and CRC32C[bhwd] instructions in MIPSr6 cores.
Signed-off-by: Marcin Nowakowski <marcin.nowakowski@mips.com>
Signed-off-by: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: linux-mips@linux-mips.org
Cc: linux-crypto@vger.kernel.org
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Patchwork: https://patchwork.linux-mips.org/patch/18601/
[jhogan@kernel.org: Add CRYPTO_ALG_OPTIONAL_KEY flag on Eric Biggers'
suggestion, due to commit a208fa8f33 ("crypto: hash - annotate
algorithms taking optional key") in v4.16-rc1]
348 lines
7.5 KiB
C
348 lines
7.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* crc32-mips.c - CRC32 and CRC32C using optional MIPSr6 instructions
|
|
*
|
|
* Module based on arm64/crypto/crc32-arm.c
|
|
*
|
|
* Copyright (C) 2014 Linaro Ltd <yazen.ghannam@linaro.org>
|
|
* Copyright (C) 2018 MIPS Tech, LLC
|
|
*/
|
|
|
|
#include <linux/unaligned/access_ok.h>
|
|
#include <linux/cpufeature.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/string.h>
|
|
#include <asm/mipsregs.h>
|
|
|
|
#include <crypto/internal/hash.h>
|
|
|
|
enum crc_op_size {
|
|
b, h, w, d,
|
|
};
|
|
|
|
enum crc_type {
|
|
crc32,
|
|
crc32c,
|
|
};
|
|
|
|
#ifndef TOOLCHAIN_SUPPORTS_CRC
|
|
#define _ASM_MACRO_CRC32(OP, SZ, TYPE) \
|
|
_ASM_MACRO_3R(OP, rt, rs, rt2, \
|
|
".ifnc \\rt, \\rt2\n\t" \
|
|
".error \"invalid operands \\\"" #OP " \\rt,\\rs,\\rt2\\\"\"\n\t" \
|
|
".endif\n\t" \
|
|
_ASM_INSN_IF_MIPS(0x7c00000f | (__rt << 16) | (__rs << 21) | \
|
|
((SZ) << 6) | ((TYPE) << 8)) \
|
|
_ASM_INSN32_IF_MM(0x00000030 | (__rs << 16) | (__rt << 21) | \
|
|
((SZ) << 14) | ((TYPE) << 3)))
|
|
_ASM_MACRO_CRC32(crc32b, 0, 0);
|
|
_ASM_MACRO_CRC32(crc32h, 1, 0);
|
|
_ASM_MACRO_CRC32(crc32w, 2, 0);
|
|
_ASM_MACRO_CRC32(crc32d, 3, 0);
|
|
_ASM_MACRO_CRC32(crc32cb, 0, 1);
|
|
_ASM_MACRO_CRC32(crc32ch, 1, 1);
|
|
_ASM_MACRO_CRC32(crc32cw, 2, 1);
|
|
_ASM_MACRO_CRC32(crc32cd, 3, 1);
|
|
#define _ASM_SET_CRC ""
|
|
#else /* !TOOLCHAIN_SUPPORTS_CRC */
|
|
#define _ASM_SET_CRC ".set\tcrc\n\t"
|
|
#endif
|
|
|
|
#define _CRC32(crc, value, size, type) \
|
|
do { \
|
|
__asm__ __volatile__( \
|
|
".set push\n\t" \
|
|
_ASM_SET_CRC \
|
|
#type #size " %0, %1, %0\n\t" \
|
|
".set pop" \
|
|
: "+r" (crc) \
|
|
: "r" (value)); \
|
|
} while (0)
|
|
|
|
#define CRC32(crc, value, size) \
|
|
_CRC32(crc, value, size, crc32)
|
|
|
|
#define CRC32C(crc, value, size) \
|
|
_CRC32(crc, value, size, crc32c)
|
|
|
|
static u32 crc32_mips_le_hw(u32 crc_, const u8 *p, unsigned int len)
|
|
{
|
|
u32 crc = crc_;
|
|
|
|
#ifdef CONFIG_64BIT
|
|
while (len >= sizeof(u64)) {
|
|
u64 value = get_unaligned_le64(p);
|
|
|
|
CRC32(crc, value, d);
|
|
p += sizeof(u64);
|
|
len -= sizeof(u64);
|
|
}
|
|
|
|
if (len & sizeof(u32)) {
|
|
#else /* !CONFIG_64BIT */
|
|
while (len >= sizeof(u32)) {
|
|
#endif
|
|
u32 value = get_unaligned_le32(p);
|
|
|
|
CRC32(crc, value, w);
|
|
p += sizeof(u32);
|
|
len -= sizeof(u32);
|
|
}
|
|
|
|
if (len & sizeof(u16)) {
|
|
u16 value = get_unaligned_le16(p);
|
|
|
|
CRC32(crc, value, h);
|
|
p += sizeof(u16);
|
|
}
|
|
|
|
if (len & sizeof(u8)) {
|
|
u8 value = *p++;
|
|
|
|
CRC32(crc, value, b);
|
|
}
|
|
|
|
return crc;
|
|
}
|
|
|
|
static u32 crc32c_mips_le_hw(u32 crc_, const u8 *p, unsigned int len)
|
|
{
|
|
u32 crc = crc_;
|
|
|
|
#ifdef CONFIG_64BIT
|
|
while (len >= sizeof(u64)) {
|
|
u64 value = get_unaligned_le64(p);
|
|
|
|
CRC32C(crc, value, d);
|
|
p += sizeof(u64);
|
|
len -= sizeof(u64);
|
|
}
|
|
|
|
if (len & sizeof(u32)) {
|
|
#else /* !CONFIG_64BIT */
|
|
while (len >= sizeof(u32)) {
|
|
#endif
|
|
u32 value = get_unaligned_le32(p);
|
|
|
|
CRC32C(crc, value, w);
|
|
p += sizeof(u32);
|
|
len -= sizeof(u32);
|
|
}
|
|
|
|
if (len & sizeof(u16)) {
|
|
u16 value = get_unaligned_le16(p);
|
|
|
|
CRC32C(crc, value, h);
|
|
p += sizeof(u16);
|
|
}
|
|
|
|
if (len & sizeof(u8)) {
|
|
u8 value = *p++;
|
|
|
|
CRC32C(crc, value, b);
|
|
}
|
|
return crc;
|
|
}
|
|
|
|
#define CHKSUM_BLOCK_SIZE 1
|
|
#define CHKSUM_DIGEST_SIZE 4
|
|
|
|
struct chksum_ctx {
|
|
u32 key;
|
|
};
|
|
|
|
struct chksum_desc_ctx {
|
|
u32 crc;
|
|
};
|
|
|
|
static int chksum_init(struct shash_desc *desc)
|
|
{
|
|
struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
|
|
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
|
|
|
|
ctx->crc = mctx->key;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Setting the seed allows arbitrary accumulators and flexible XOR policy
|
|
* If your algorithm starts with ~0, then XOR with ~0 before you set
|
|
* the seed.
|
|
*/
|
|
static int chksum_setkey(struct crypto_shash *tfm, const u8 *key,
|
|
unsigned int keylen)
|
|
{
|
|
struct chksum_ctx *mctx = crypto_shash_ctx(tfm);
|
|
|
|
if (keylen != sizeof(mctx->key)) {
|
|
crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
|
|
return -EINVAL;
|
|
}
|
|
mctx->key = get_unaligned_le32(key);
|
|
return 0;
|
|
}
|
|
|
|
static int chksum_update(struct shash_desc *desc, const u8 *data,
|
|
unsigned int length)
|
|
{
|
|
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
|
|
|
|
ctx->crc = crc32_mips_le_hw(ctx->crc, data, length);
|
|
return 0;
|
|
}
|
|
|
|
static int chksumc_update(struct shash_desc *desc, const u8 *data,
|
|
unsigned int length)
|
|
{
|
|
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
|
|
|
|
ctx->crc = crc32c_mips_le_hw(ctx->crc, data, length);
|
|
return 0;
|
|
}
|
|
|
|
static int chksum_final(struct shash_desc *desc, u8 *out)
|
|
{
|
|
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
|
|
|
|
put_unaligned_le32(ctx->crc, out);
|
|
return 0;
|
|
}
|
|
|
|
static int chksumc_final(struct shash_desc *desc, u8 *out)
|
|
{
|
|
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
|
|
|
|
put_unaligned_le32(~ctx->crc, out);
|
|
return 0;
|
|
}
|
|
|
|
static int __chksum_finup(u32 crc, const u8 *data, unsigned int len, u8 *out)
|
|
{
|
|
put_unaligned_le32(crc32_mips_le_hw(crc, data, len), out);
|
|
return 0;
|
|
}
|
|
|
|
static int __chksumc_finup(u32 crc, const u8 *data, unsigned int len, u8 *out)
|
|
{
|
|
put_unaligned_le32(~crc32c_mips_le_hw(crc, data, len), out);
|
|
return 0;
|
|
}
|
|
|
|
static int chksum_finup(struct shash_desc *desc, const u8 *data,
|
|
unsigned int len, u8 *out)
|
|
{
|
|
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
|
|
|
|
return __chksum_finup(ctx->crc, data, len, out);
|
|
}
|
|
|
|
static int chksumc_finup(struct shash_desc *desc, const u8 *data,
|
|
unsigned int len, u8 *out)
|
|
{
|
|
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
|
|
|
|
return __chksumc_finup(ctx->crc, data, len, out);
|
|
}
|
|
|
|
static int chksum_digest(struct shash_desc *desc, const u8 *data,
|
|
unsigned int length, u8 *out)
|
|
{
|
|
struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
|
|
|
|
return __chksum_finup(mctx->key, data, length, out);
|
|
}
|
|
|
|
static int chksumc_digest(struct shash_desc *desc, const u8 *data,
|
|
unsigned int length, u8 *out)
|
|
{
|
|
struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
|
|
|
|
return __chksumc_finup(mctx->key, data, length, out);
|
|
}
|
|
|
|
static int chksum_cra_init(struct crypto_tfm *tfm)
|
|
{
|
|
struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);
|
|
|
|
mctx->key = ~0;
|
|
return 0;
|
|
}
|
|
|
|
static struct shash_alg crc32_alg = {
|
|
.digestsize = CHKSUM_DIGEST_SIZE,
|
|
.setkey = chksum_setkey,
|
|
.init = chksum_init,
|
|
.update = chksum_update,
|
|
.final = chksum_final,
|
|
.finup = chksum_finup,
|
|
.digest = chksum_digest,
|
|
.descsize = sizeof(struct chksum_desc_ctx),
|
|
.base = {
|
|
.cra_name = "crc32",
|
|
.cra_driver_name = "crc32-mips-hw",
|
|
.cra_priority = 300,
|
|
.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
|
|
.cra_blocksize = CHKSUM_BLOCK_SIZE,
|
|
.cra_alignmask = 0,
|
|
.cra_ctxsize = sizeof(struct chksum_ctx),
|
|
.cra_module = THIS_MODULE,
|
|
.cra_init = chksum_cra_init,
|
|
}
|
|
};
|
|
|
|
static struct shash_alg crc32c_alg = {
|
|
.digestsize = CHKSUM_DIGEST_SIZE,
|
|
.setkey = chksum_setkey,
|
|
.init = chksum_init,
|
|
.update = chksumc_update,
|
|
.final = chksumc_final,
|
|
.finup = chksumc_finup,
|
|
.digest = chksumc_digest,
|
|
.descsize = sizeof(struct chksum_desc_ctx),
|
|
.base = {
|
|
.cra_name = "crc32c",
|
|
.cra_driver_name = "crc32c-mips-hw",
|
|
.cra_priority = 300,
|
|
.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
|
|
.cra_blocksize = CHKSUM_BLOCK_SIZE,
|
|
.cra_alignmask = 0,
|
|
.cra_ctxsize = sizeof(struct chksum_ctx),
|
|
.cra_module = THIS_MODULE,
|
|
.cra_init = chksum_cra_init,
|
|
}
|
|
};
|
|
|
|
static int __init crc32_mod_init(void)
|
|
{
|
|
int err;
|
|
|
|
err = crypto_register_shash(&crc32_alg);
|
|
|
|
if (err)
|
|
return err;
|
|
|
|
err = crypto_register_shash(&crc32c_alg);
|
|
|
|
if (err) {
|
|
crypto_unregister_shash(&crc32_alg);
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit crc32_mod_exit(void)
|
|
{
|
|
crypto_unregister_shash(&crc32_alg);
|
|
crypto_unregister_shash(&crc32c_alg);
|
|
}
|
|
|
|
MODULE_AUTHOR("Marcin Nowakowski <marcin.nowakowski@mips.com");
|
|
MODULE_DESCRIPTION("CRC32 and CRC32C using optional MIPS instructions");
|
|
MODULE_LICENSE("GPL v2");
|
|
|
|
module_cpu_feature_match(MIPS_CRC32, crc32_mod_init);
|
|
module_exit(crc32_mod_exit);
|