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