mirror of https://gitee.com/openkylin/linux.git
185 lines
4.5 KiB
C
185 lines
4.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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, 2019 International Business Machines Inc.
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*
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* Author: Marcelo Henrique Cerri <mhcerri@br.ibm.com>
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*
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* Extended by Daniel Axtens <dja@axtens.net> to replace the fallback
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* mechanism. The new approach is based on arm64 code, which is:
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* Copyright (C) 2014 - 2018 Linaro Ltd. <ard.biesheuvel@linaro.org>
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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 <asm/simd.h>
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#include <asm/switch_to.h>
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#include <crypto/aes.h>
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#include <crypto/ghash.h>
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#include <crypto/scatterwalk.h>
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#include <crypto/internal/hash.h>
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#include <crypto/internal/simd.h>
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#include <crypto/b128ops.h>
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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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/* key used by vector asm */
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u128 htable[16];
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/* key used by software fallback */
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be128 key;
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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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};
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static int p8_ghash_init(struct shash_desc *desc)
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{
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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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return 0;
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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_BLOCK_SIZE)
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return -EINVAL;
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preempt_disable();
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pagefault_disable();
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enable_kernel_vsx();
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gcm_init_p8(ctx->htable, (const u64 *) key);
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disable_kernel_vsx();
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pagefault_enable();
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preempt_enable();
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memcpy(&ctx->key, key, GHASH_BLOCK_SIZE);
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return 0;
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}
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static inline void __ghash_block(struct p8_ghash_ctx *ctx,
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struct p8_ghash_desc_ctx *dctx)
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{
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if (crypto_simd_usable()) {
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preempt_disable();
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pagefault_disable();
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enable_kernel_vsx();
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gcm_ghash_p8(dctx->shash, ctx->htable,
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dctx->buffer, GHASH_DIGEST_SIZE);
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disable_kernel_vsx();
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pagefault_enable();
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preempt_enable();
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} else {
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crypto_xor((u8 *)dctx->shash, dctx->buffer, GHASH_BLOCK_SIZE);
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gf128mul_lle((be128 *)dctx->shash, &ctx->key);
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}
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}
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static inline void __ghash_blocks(struct p8_ghash_ctx *ctx,
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struct p8_ghash_desc_ctx *dctx,
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const u8 *src, unsigned int srclen)
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{
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if (crypto_simd_usable()) {
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preempt_disable();
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pagefault_disable();
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enable_kernel_vsx();
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gcm_ghash_p8(dctx->shash, ctx->htable,
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src, srclen);
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disable_kernel_vsx();
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pagefault_enable();
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preempt_enable();
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} else {
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while (srclen >= GHASH_BLOCK_SIZE) {
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crypto_xor((u8 *)dctx->shash, src, GHASH_BLOCK_SIZE);
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gf128mul_lle((be128 *)dctx->shash, &ctx->key);
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srclen -= GHASH_BLOCK_SIZE;
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src += GHASH_BLOCK_SIZE;
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}
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}
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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 (dctx->bytes) {
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if (dctx->bytes + srclen < GHASH_DIGEST_SIZE) {
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memcpy(dctx->buffer + dctx->bytes, src,
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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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__ghash_block(ctx, dctx);
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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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__ghash_blocks(ctx, dctx, src, len);
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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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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 (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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__ghash_block(ctx, dctx);
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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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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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+ sizeof(struct 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_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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},
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};
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