forked from Minki/linux
crypto: vmx - Adding GHASH routines for VMX module
This patch adds GHASH routines to VMX module in order to make use of VMX cryptographic acceleration instructions on Power 8 CPU. Signed-off-by: Leonidas S. Barbosa <leosilva@linux.vnet.ibm.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Marcelo H. Cerri
Herbert Xu
parent
4f7f60d312
commit
cc333cd68d
214
drivers/crypto/vmx/ghash.c
Normal file
214
drivers/crypto/vmx/ghash.c
Normal file
@ -0,0 +1,214 @@
|
||||
/**
|
||||
* GHASH routines supporting VMX instructions on the Power 8
|
||||
*
|
||||
* Copyright (C) 2015 International Business Machines Inc.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; version 2 only.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
||||
*
|
||||
* Author: Marcelo Henrique Cerri <mhcerri@br.ibm.com>
|
||||
*/
|
||||
|
||||
#include <linux/types.h>
|
||||
#include <linux/err.h>
|
||||
#include <linux/crypto.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/hardirq.h>
|
||||
#include <asm/switch_to.h>
|
||||
#include <crypto/aes.h>
|
||||
#include <crypto/scatterwalk.h>
|
||||
#include <crypto/internal/hash.h>
|
||||
#include <crypto/b128ops.h>
|
||||
|
||||
#define IN_INTERRUPT in_interrupt()
|
||||
|
||||
#define GHASH_BLOCK_SIZE (16)
|
||||
#define GHASH_DIGEST_SIZE (16)
|
||||
#define GHASH_KEY_LEN (16)
|
||||
|
||||
void gcm_init_p8(u128 htable[16], const u64 Xi[2]);
|
||||
void gcm_gmult_p8(u64 Xi[2], const u128 htable[16]);
|
||||
void gcm_ghash_p8(u64 Xi[2], const u128 htable[16],
|
||||
const u8 *in,size_t len);
|
||||
|
||||
struct p8_ghash_ctx {
|
||||
u128 htable[16];
|
||||
struct crypto_shash *fallback;
|
||||
};
|
||||
|
||||
struct p8_ghash_desc_ctx {
|
||||
u64 shash[2];
|
||||
u8 buffer[GHASH_DIGEST_SIZE];
|
||||
int bytes;
|
||||
struct shash_desc fallback_desc;
|
||||
};
|
||||
|
||||
static int p8_ghash_init_tfm(struct crypto_tfm *tfm)
|
||||
{
|
||||
const char *alg;
|
||||
struct crypto_shash *fallback;
|
||||
struct crypto_shash *shash_tfm = __crypto_shash_cast(tfm);
|
||||
struct p8_ghash_ctx *ctx = crypto_tfm_ctx(tfm);
|
||||
|
||||
if (!(alg = crypto_tfm_alg_name(tfm))) {
|
||||
printk(KERN_ERR "Failed to get algorithm name.\n");
|
||||
return -ENOENT;
|
||||
}
|
||||
|
||||
fallback = crypto_alloc_shash(alg, 0 ,CRYPTO_ALG_NEED_FALLBACK);
|
||||
if (IS_ERR(fallback)) {
|
||||
printk(KERN_ERR "Failed to allocate transformation for '%s': %ld\n",
|
||||
alg, PTR_ERR(fallback));
|
||||
return PTR_ERR(fallback);
|
||||
}
|
||||
printk(KERN_INFO "Using '%s' as fallback implementation.\n",
|
||||
crypto_tfm_alg_driver_name(crypto_shash_tfm(fallback)));
|
||||
|
||||
crypto_shash_set_flags(fallback,
|
||||
crypto_shash_get_flags((struct crypto_shash *) tfm));
|
||||
ctx->fallback = fallback;
|
||||
|
||||
shash_tfm->descsize = sizeof(struct p8_ghash_desc_ctx)
|
||||
+ crypto_shash_descsize(fallback);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void p8_ghash_exit_tfm(struct crypto_tfm *tfm)
|
||||
{
|
||||
struct p8_ghash_ctx *ctx = crypto_tfm_ctx(tfm);
|
||||
|
||||
if (ctx->fallback) {
|
||||
crypto_free_shash(ctx->fallback);
|
||||
ctx->fallback = NULL;
|
||||
}
|
||||
}
|
||||
|
||||
static int p8_ghash_init(struct shash_desc *desc)
|
||||
{
|
||||
struct p8_ghash_ctx *ctx = crypto_tfm_ctx(crypto_shash_tfm(desc->tfm));
|
||||
struct p8_ghash_desc_ctx *dctx = shash_desc_ctx(desc);
|
||||
|
||||
dctx->bytes = 0;
|
||||
memset(dctx->shash, 0, GHASH_DIGEST_SIZE);
|
||||
dctx->fallback_desc.tfm = ctx->fallback;
|
||||
dctx->fallback_desc.flags = desc->flags;
|
||||
return crypto_shash_init(&dctx->fallback_desc);
|
||||
}
|
||||
|
||||
static int p8_ghash_setkey(struct crypto_shash *tfm, const u8 *key,
|
||||
unsigned int keylen)
|
||||
{
|
||||
struct p8_ghash_ctx *ctx = crypto_tfm_ctx(crypto_shash_tfm(tfm));
|
||||
|
||||
if (keylen != GHASH_KEY_LEN)
|
||||
return -EINVAL;
|
||||
|
||||
pagefault_disable();
|
||||
enable_kernel_altivec();
|
||||
enable_kernel_fp();
|
||||
gcm_init_p8(ctx->htable, (const u64 *) key);
|
||||
pagefault_enable();
|
||||
return crypto_shash_setkey(ctx->fallback, key, keylen);
|
||||
}
|
||||
|
||||
static int p8_ghash_update(struct shash_desc *desc,
|
||||
const u8 *src, unsigned int srclen)
|
||||
{
|
||||
unsigned int len;
|
||||
struct p8_ghash_ctx *ctx = crypto_tfm_ctx(crypto_shash_tfm(desc->tfm));
|
||||
struct p8_ghash_desc_ctx *dctx = shash_desc_ctx(desc);
|
||||
|
||||
if (IN_INTERRUPT) {
|
||||
return crypto_shash_update(&dctx->fallback_desc, src, srclen);
|
||||
} else {
|
||||
if (dctx->bytes) {
|
||||
if (dctx->bytes + srclen < GHASH_DIGEST_SIZE) {
|
||||
memcpy(dctx->buffer + dctx->bytes, src, srclen);
|
||||
dctx->bytes += srclen;
|
||||
return 0;
|
||||
}
|
||||
memcpy(dctx->buffer + dctx->bytes, src,
|
||||
GHASH_DIGEST_SIZE - dctx->bytes);
|
||||
pagefault_disable();
|
||||
enable_kernel_altivec();
|
||||
enable_kernel_fp();
|
||||
gcm_ghash_p8(dctx->shash, ctx->htable, dctx->buffer,
|
||||
GHASH_DIGEST_SIZE);
|
||||
pagefault_enable();
|
||||
src += GHASH_DIGEST_SIZE - dctx->bytes;
|
||||
srclen -= GHASH_DIGEST_SIZE - dctx->bytes;
|
||||
dctx->bytes = 0;
|
||||
}
|
||||
len = srclen & ~(GHASH_DIGEST_SIZE - 1);
|
||||
if (len) {
|
||||
pagefault_disable();
|
||||
enable_kernel_altivec();
|
||||
enable_kernel_fp();
|
||||
gcm_ghash_p8(dctx->shash, ctx->htable, src, len);
|
||||
pagefault_enable();
|
||||
src += len;
|
||||
srclen -= len;
|
||||
}
|
||||
if (srclen) {
|
||||
memcpy(dctx->buffer, src, srclen);
|
||||
dctx->bytes = srclen;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
static int p8_ghash_final(struct shash_desc *desc, u8 *out)
|
||||
{
|
||||
int i;
|
||||
struct p8_ghash_ctx *ctx = crypto_tfm_ctx(crypto_shash_tfm(desc->tfm));
|
||||
struct p8_ghash_desc_ctx *dctx = shash_desc_ctx(desc);
|
||||
|
||||
if (IN_INTERRUPT) {
|
||||
return crypto_shash_final(&dctx->fallback_desc, out);
|
||||
} else {
|
||||
if (dctx->bytes) {
|
||||
for (i = dctx->bytes; i < GHASH_DIGEST_SIZE; i++)
|
||||
dctx->buffer[i] = 0;
|
||||
pagefault_disable();
|
||||
enable_kernel_altivec();
|
||||
enable_kernel_fp();
|
||||
gcm_ghash_p8(dctx->shash, ctx->htable, dctx->buffer,
|
||||
GHASH_DIGEST_SIZE);
|
||||
pagefault_enable();
|
||||
dctx->bytes = 0;
|
||||
}
|
||||
memcpy(out, dctx->shash, GHASH_DIGEST_SIZE);
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
struct shash_alg p8_ghash_alg = {
|
||||
.digestsize = GHASH_DIGEST_SIZE,
|
||||
.init = p8_ghash_init,
|
||||
.update = p8_ghash_update,
|
||||
.final = p8_ghash_final,
|
||||
.setkey = p8_ghash_setkey,
|
||||
.descsize = sizeof(struct p8_ghash_desc_ctx),
|
||||
.base = {
|
||||
.cra_name = "ghash",
|
||||
.cra_driver_name = "p8_ghash",
|
||||
.cra_priority = 1000,
|
||||
.cra_flags = CRYPTO_ALG_TYPE_SHASH | CRYPTO_ALG_NEED_FALLBACK,
|
||||
.cra_blocksize = GHASH_BLOCK_SIZE,
|
||||
.cra_ctxsize = sizeof(struct p8_ghash_ctx),
|
||||
.cra_module = THIS_MODULE,
|
||||
.cra_init = p8_ghash_init_tfm,
|
||||
.cra_exit = p8_ghash_exit_tfm,
|
||||
},
|
||||
};
|
||||
Loading…
Reference in New Issue
Block a user