5f60d5f6bb
asm/unaligned.h is always an include of asm-generic/unaligned.h; might as well move that thing to linux/unaligned.h and include that - there's nothing arch-specific in that header. auto-generated by the following: for i in `git grep -l -w asm/unaligned.h`; do sed -i -e "s/asm\/unaligned.h/linux\/unaligned.h/" $i done for i in `git grep -l -w asm-generic/unaligned.h`; do sed -i -e "s/asm-generic\/unaligned.h/linux\/unaligned.h/" $i done git mv include/asm-generic/unaligned.h include/linux/unaligned.h git mv tools/include/asm-generic/unaligned.h tools/include/linux/unaligned.h sed -i -e "/unaligned.h/d" include/asm-generic/Kbuild sed -i -e "s/__ASM_GENERIC/__LINUX/" include/linux/unaligned.h tools/include/linux/unaligned.h
374 lines
9.6 KiB
C
374 lines
9.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Accelerated GHASH implementation with Intel PCLMULQDQ-NI
|
|
* instructions. This file contains glue code.
|
|
*
|
|
* Copyright (c) 2009 Intel Corp.
|
|
* Author: Huang Ying <ying.huang@intel.com>
|
|
*/
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/crypto.h>
|
|
#include <crypto/algapi.h>
|
|
#include <crypto/cryptd.h>
|
|
#include <crypto/gf128mul.h>
|
|
#include <crypto/internal/hash.h>
|
|
#include <crypto/internal/simd.h>
|
|
#include <asm/cpu_device_id.h>
|
|
#include <asm/simd.h>
|
|
#include <linux/unaligned.h>
|
|
|
|
#define GHASH_BLOCK_SIZE 16
|
|
#define GHASH_DIGEST_SIZE 16
|
|
|
|
void clmul_ghash_mul(char *dst, const le128 *shash);
|
|
|
|
void clmul_ghash_update(char *dst, const char *src, unsigned int srclen,
|
|
const le128 *shash);
|
|
|
|
struct ghash_async_ctx {
|
|
struct cryptd_ahash *cryptd_tfm;
|
|
};
|
|
|
|
struct ghash_ctx {
|
|
le128 shash;
|
|
};
|
|
|
|
struct ghash_desc_ctx {
|
|
u8 buffer[GHASH_BLOCK_SIZE];
|
|
u32 bytes;
|
|
};
|
|
|
|
static int ghash_init(struct shash_desc *desc)
|
|
{
|
|
struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
|
|
|
|
memset(dctx, 0, sizeof(*dctx));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ghash_setkey(struct crypto_shash *tfm,
|
|
const u8 *key, unsigned int keylen)
|
|
{
|
|
struct ghash_ctx *ctx = crypto_shash_ctx(tfm);
|
|
u64 a, b;
|
|
|
|
if (keylen != GHASH_BLOCK_SIZE)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* GHASH maps bits to polynomial coefficients backwards, which makes it
|
|
* hard to implement. But it can be shown that the GHASH multiplication
|
|
*
|
|
* D * K (mod x^128 + x^7 + x^2 + x + 1)
|
|
*
|
|
* (where D is a data block and K is the key) is equivalent to:
|
|
*
|
|
* bitreflect(D) * bitreflect(K) * x^(-127)
|
|
* (mod x^128 + x^127 + x^126 + x^121 + 1)
|
|
*
|
|
* So, the code below precomputes:
|
|
*
|
|
* bitreflect(K) * x^(-127) (mod x^128 + x^127 + x^126 + x^121 + 1)
|
|
*
|
|
* ... but in Montgomery form (so that Montgomery multiplication can be
|
|
* used), i.e. with an extra x^128 factor, which means actually:
|
|
*
|
|
* bitreflect(K) * x (mod x^128 + x^127 + x^126 + x^121 + 1)
|
|
*
|
|
* The within-a-byte part of bitreflect() cancels out GHASH's built-in
|
|
* reflection, and thus bitreflect() is actually a byteswap.
|
|
*/
|
|
a = get_unaligned_be64(key);
|
|
b = get_unaligned_be64(key + 8);
|
|
ctx->shash.a = cpu_to_le64((a << 1) | (b >> 63));
|
|
ctx->shash.b = cpu_to_le64((b << 1) | (a >> 63));
|
|
if (a >> 63)
|
|
ctx->shash.a ^= cpu_to_le64((u64)0xc2 << 56);
|
|
return 0;
|
|
}
|
|
|
|
static int ghash_update(struct shash_desc *desc,
|
|
const u8 *src, unsigned int srclen)
|
|
{
|
|
struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
|
|
struct ghash_ctx *ctx = crypto_shash_ctx(desc->tfm);
|
|
u8 *dst = dctx->buffer;
|
|
|
|
kernel_fpu_begin();
|
|
if (dctx->bytes) {
|
|
int n = min(srclen, dctx->bytes);
|
|
u8 *pos = dst + (GHASH_BLOCK_SIZE - dctx->bytes);
|
|
|
|
dctx->bytes -= n;
|
|
srclen -= n;
|
|
|
|
while (n--)
|
|
*pos++ ^= *src++;
|
|
|
|
if (!dctx->bytes)
|
|
clmul_ghash_mul(dst, &ctx->shash);
|
|
}
|
|
|
|
clmul_ghash_update(dst, src, srclen, &ctx->shash);
|
|
kernel_fpu_end();
|
|
|
|
if (srclen & 0xf) {
|
|
src += srclen - (srclen & 0xf);
|
|
srclen &= 0xf;
|
|
dctx->bytes = GHASH_BLOCK_SIZE - srclen;
|
|
while (srclen--)
|
|
*dst++ ^= *src++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ghash_flush(struct ghash_ctx *ctx, struct ghash_desc_ctx *dctx)
|
|
{
|
|
u8 *dst = dctx->buffer;
|
|
|
|
if (dctx->bytes) {
|
|
u8 *tmp = dst + (GHASH_BLOCK_SIZE - dctx->bytes);
|
|
|
|
while (dctx->bytes--)
|
|
*tmp++ ^= 0;
|
|
|
|
kernel_fpu_begin();
|
|
clmul_ghash_mul(dst, &ctx->shash);
|
|
kernel_fpu_end();
|
|
}
|
|
|
|
dctx->bytes = 0;
|
|
}
|
|
|
|
static int ghash_final(struct shash_desc *desc, u8 *dst)
|
|
{
|
|
struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
|
|
struct ghash_ctx *ctx = crypto_shash_ctx(desc->tfm);
|
|
u8 *buf = dctx->buffer;
|
|
|
|
ghash_flush(ctx, dctx);
|
|
memcpy(dst, buf, GHASH_BLOCK_SIZE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct shash_alg ghash_alg = {
|
|
.digestsize = GHASH_DIGEST_SIZE,
|
|
.init = ghash_init,
|
|
.update = ghash_update,
|
|
.final = ghash_final,
|
|
.setkey = ghash_setkey,
|
|
.descsize = sizeof(struct ghash_desc_ctx),
|
|
.base = {
|
|
.cra_name = "__ghash",
|
|
.cra_driver_name = "__ghash-pclmulqdqni",
|
|
.cra_priority = 0,
|
|
.cra_flags = CRYPTO_ALG_INTERNAL,
|
|
.cra_blocksize = GHASH_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct ghash_ctx),
|
|
.cra_module = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int ghash_async_init(struct ahash_request *req)
|
|
{
|
|
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
|
|
struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
|
|
struct ahash_request *cryptd_req = ahash_request_ctx(req);
|
|
struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
|
|
struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
|
|
struct crypto_shash *child = cryptd_ahash_child(cryptd_tfm);
|
|
|
|
desc->tfm = child;
|
|
return crypto_shash_init(desc);
|
|
}
|
|
|
|
static int ghash_async_update(struct ahash_request *req)
|
|
{
|
|
struct ahash_request *cryptd_req = ahash_request_ctx(req);
|
|
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
|
|
struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
|
|
struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
|
|
|
|
if (!crypto_simd_usable() ||
|
|
(in_atomic() && cryptd_ahash_queued(cryptd_tfm))) {
|
|
memcpy(cryptd_req, req, sizeof(*req));
|
|
ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
|
|
return crypto_ahash_update(cryptd_req);
|
|
} else {
|
|
struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
|
|
return shash_ahash_update(req, desc);
|
|
}
|
|
}
|
|
|
|
static int ghash_async_final(struct ahash_request *req)
|
|
{
|
|
struct ahash_request *cryptd_req = ahash_request_ctx(req);
|
|
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
|
|
struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
|
|
struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
|
|
|
|
if (!crypto_simd_usable() ||
|
|
(in_atomic() && cryptd_ahash_queued(cryptd_tfm))) {
|
|
memcpy(cryptd_req, req, sizeof(*req));
|
|
ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
|
|
return crypto_ahash_final(cryptd_req);
|
|
} else {
|
|
struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
|
|
return crypto_shash_final(desc, req->result);
|
|
}
|
|
}
|
|
|
|
static int ghash_async_import(struct ahash_request *req, const void *in)
|
|
{
|
|
struct ahash_request *cryptd_req = ahash_request_ctx(req);
|
|
struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
|
|
struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
|
|
|
|
ghash_async_init(req);
|
|
memcpy(dctx, in, sizeof(*dctx));
|
|
return 0;
|
|
|
|
}
|
|
|
|
static int ghash_async_export(struct ahash_request *req, void *out)
|
|
{
|
|
struct ahash_request *cryptd_req = ahash_request_ctx(req);
|
|
struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
|
|
struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
|
|
|
|
memcpy(out, dctx, sizeof(*dctx));
|
|
return 0;
|
|
|
|
}
|
|
|
|
static int ghash_async_digest(struct ahash_request *req)
|
|
{
|
|
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
|
|
struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
|
|
struct ahash_request *cryptd_req = ahash_request_ctx(req);
|
|
struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
|
|
|
|
if (!crypto_simd_usable() ||
|
|
(in_atomic() && cryptd_ahash_queued(cryptd_tfm))) {
|
|
memcpy(cryptd_req, req, sizeof(*req));
|
|
ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
|
|
return crypto_ahash_digest(cryptd_req);
|
|
} else {
|
|
struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
|
|
struct crypto_shash *child = cryptd_ahash_child(cryptd_tfm);
|
|
|
|
desc->tfm = child;
|
|
return shash_ahash_digest(req, desc);
|
|
}
|
|
}
|
|
|
|
static int ghash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
|
|
unsigned int keylen)
|
|
{
|
|
struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
|
|
struct crypto_ahash *child = &ctx->cryptd_tfm->base;
|
|
|
|
crypto_ahash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
|
|
crypto_ahash_set_flags(child, crypto_ahash_get_flags(tfm)
|
|
& CRYPTO_TFM_REQ_MASK);
|
|
return crypto_ahash_setkey(child, key, keylen);
|
|
}
|
|
|
|
static int ghash_async_init_tfm(struct crypto_tfm *tfm)
|
|
{
|
|
struct cryptd_ahash *cryptd_tfm;
|
|
struct ghash_async_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
|
|
cryptd_tfm = cryptd_alloc_ahash("__ghash-pclmulqdqni",
|
|
CRYPTO_ALG_INTERNAL,
|
|
CRYPTO_ALG_INTERNAL);
|
|
if (IS_ERR(cryptd_tfm))
|
|
return PTR_ERR(cryptd_tfm);
|
|
ctx->cryptd_tfm = cryptd_tfm;
|
|
crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
|
|
sizeof(struct ahash_request) +
|
|
crypto_ahash_reqsize(&cryptd_tfm->base));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ghash_async_exit_tfm(struct crypto_tfm *tfm)
|
|
{
|
|
struct ghash_async_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
|
|
cryptd_free_ahash(ctx->cryptd_tfm);
|
|
}
|
|
|
|
static struct ahash_alg ghash_async_alg = {
|
|
.init = ghash_async_init,
|
|
.update = ghash_async_update,
|
|
.final = ghash_async_final,
|
|
.setkey = ghash_async_setkey,
|
|
.digest = ghash_async_digest,
|
|
.export = ghash_async_export,
|
|
.import = ghash_async_import,
|
|
.halg = {
|
|
.digestsize = GHASH_DIGEST_SIZE,
|
|
.statesize = sizeof(struct ghash_desc_ctx),
|
|
.base = {
|
|
.cra_name = "ghash",
|
|
.cra_driver_name = "ghash-clmulni",
|
|
.cra_priority = 400,
|
|
.cra_ctxsize = sizeof(struct ghash_async_ctx),
|
|
.cra_flags = CRYPTO_ALG_ASYNC,
|
|
.cra_blocksize = GHASH_BLOCK_SIZE,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_init = ghash_async_init_tfm,
|
|
.cra_exit = ghash_async_exit_tfm,
|
|
},
|
|
},
|
|
};
|
|
|
|
static const struct x86_cpu_id pcmul_cpu_id[] = {
|
|
X86_MATCH_FEATURE(X86_FEATURE_PCLMULQDQ, NULL), /* Pickle-Mickle-Duck */
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(x86cpu, pcmul_cpu_id);
|
|
|
|
static int __init ghash_pclmulqdqni_mod_init(void)
|
|
{
|
|
int err;
|
|
|
|
if (!x86_match_cpu(pcmul_cpu_id))
|
|
return -ENODEV;
|
|
|
|
err = crypto_register_shash(&ghash_alg);
|
|
if (err)
|
|
goto err_out;
|
|
err = crypto_register_ahash(&ghash_async_alg);
|
|
if (err)
|
|
goto err_shash;
|
|
|
|
return 0;
|
|
|
|
err_shash:
|
|
crypto_unregister_shash(&ghash_alg);
|
|
err_out:
|
|
return err;
|
|
}
|
|
|
|
static void __exit ghash_pclmulqdqni_mod_exit(void)
|
|
{
|
|
crypto_unregister_ahash(&ghash_async_alg);
|
|
crypto_unregister_shash(&ghash_alg);
|
|
}
|
|
|
|
module_init(ghash_pclmulqdqni_mod_init);
|
|
module_exit(ghash_pclmulqdqni_mod_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("GHASH hash function, accelerated by PCLMULQDQ-NI");
|
|
MODULE_ALIAS_CRYPTO("ghash");
|