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184 lines
4.5 KiB
184 lines
4.5 KiB
// 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 <[email protected]> |
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* |
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* Extended by Daniel Axtens <[email protected]> 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. <[email protected]> |
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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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