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380 lines
9.8 KiB
380 lines
9.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Accelerated GHASH implementation with ARMv8 vmull.p64 instructions. |
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* |
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* Copyright (C) 2015 - 2018 Linaro Ltd. <[email protected]> |
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*/ |
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#include <asm/hwcap.h> |
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#include <asm/neon.h> |
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#include <asm/simd.h> |
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#include <asm/unaligned.h> |
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#include <crypto/b128ops.h> |
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#include <crypto/cryptd.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/gf128mul.h> |
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#include <linux/cpufeature.h> |
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#include <linux/crypto.h> |
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#include <linux/jump_label.h> |
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#include <linux/module.h> |
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MODULE_DESCRIPTION("GHASH hash function using ARMv8 Crypto Extensions"); |
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MODULE_AUTHOR("Ard Biesheuvel <[email protected]>"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_ALIAS_CRYPTO("ghash"); |
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#define GHASH_BLOCK_SIZE 16 |
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#define GHASH_DIGEST_SIZE 16 |
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struct ghash_key { |
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be128 k; |
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u64 h[][2]; |
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}; |
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struct ghash_desc_ctx { |
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u64 digest[GHASH_DIGEST_SIZE/sizeof(u64)]; |
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u8 buf[GHASH_BLOCK_SIZE]; |
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u32 count; |
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}; |
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struct ghash_async_ctx { |
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struct cryptd_ahash *cryptd_tfm; |
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}; |
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asmlinkage void pmull_ghash_update_p64(int blocks, u64 dg[], const char *src, |
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u64 const h[][2], const char *head); |
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asmlinkage void pmull_ghash_update_p8(int blocks, u64 dg[], const char *src, |
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u64 const h[][2], const char *head); |
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(use_p64); |
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static int ghash_init(struct shash_desc *desc) |
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{ |
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struct ghash_desc_ctx *ctx = shash_desc_ctx(desc); |
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*ctx = (struct ghash_desc_ctx){}; |
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return 0; |
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} |
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static void ghash_do_update(int blocks, u64 dg[], const char *src, |
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struct ghash_key *key, const char *head) |
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{ |
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if (likely(crypto_simd_usable())) { |
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kernel_neon_begin(); |
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if (static_branch_likely(&use_p64)) |
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pmull_ghash_update_p64(blocks, dg, src, key->h, head); |
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else |
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pmull_ghash_update_p8(blocks, dg, src, key->h, head); |
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kernel_neon_end(); |
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} else { |
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be128 dst = { cpu_to_be64(dg[1]), cpu_to_be64(dg[0]) }; |
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do { |
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const u8 *in = src; |
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if (head) { |
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in = head; |
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blocks++; |
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head = NULL; |
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} else { |
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src += GHASH_BLOCK_SIZE; |
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} |
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crypto_xor((u8 *)&dst, in, GHASH_BLOCK_SIZE); |
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gf128mul_lle(&dst, &key->k); |
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} while (--blocks); |
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dg[0] = be64_to_cpu(dst.b); |
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dg[1] = be64_to_cpu(dst.a); |
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} |
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} |
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static int ghash_update(struct shash_desc *desc, const u8 *src, |
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unsigned int len) |
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{ |
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struct ghash_desc_ctx *ctx = shash_desc_ctx(desc); |
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unsigned int partial = ctx->count % GHASH_BLOCK_SIZE; |
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ctx->count += len; |
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if ((partial + len) >= GHASH_BLOCK_SIZE) { |
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struct ghash_key *key = crypto_shash_ctx(desc->tfm); |
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int blocks; |
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if (partial) { |
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int p = GHASH_BLOCK_SIZE - partial; |
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memcpy(ctx->buf + partial, src, p); |
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src += p; |
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len -= p; |
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} |
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blocks = len / GHASH_BLOCK_SIZE; |
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len %= GHASH_BLOCK_SIZE; |
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ghash_do_update(blocks, ctx->digest, src, key, |
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partial ? ctx->buf : NULL); |
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src += blocks * GHASH_BLOCK_SIZE; |
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partial = 0; |
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} |
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if (len) |
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memcpy(ctx->buf + partial, src, len); |
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return 0; |
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} |
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static int ghash_final(struct shash_desc *desc, u8 *dst) |
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{ |
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struct ghash_desc_ctx *ctx = shash_desc_ctx(desc); |
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unsigned int partial = ctx->count % GHASH_BLOCK_SIZE; |
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if (partial) { |
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struct ghash_key *key = crypto_shash_ctx(desc->tfm); |
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memset(ctx->buf + partial, 0, GHASH_BLOCK_SIZE - partial); |
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ghash_do_update(1, ctx->digest, ctx->buf, key, NULL); |
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} |
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put_unaligned_be64(ctx->digest[1], dst); |
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put_unaligned_be64(ctx->digest[0], dst + 8); |
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*ctx = (struct ghash_desc_ctx){}; |
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return 0; |
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} |
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static void ghash_reflect(u64 h[], const be128 *k) |
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{ |
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u64 carry = be64_to_cpu(k->a) >> 63; |
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h[0] = (be64_to_cpu(k->b) << 1) | carry; |
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h[1] = (be64_to_cpu(k->a) << 1) | (be64_to_cpu(k->b) >> 63); |
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if (carry) |
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h[1] ^= 0xc200000000000000UL; |
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} |
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static int ghash_setkey(struct crypto_shash *tfm, |
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const u8 *inkey, unsigned int keylen) |
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{ |
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struct ghash_key *key = crypto_shash_ctx(tfm); |
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if (keylen != GHASH_BLOCK_SIZE) |
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return -EINVAL; |
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/* needed for the fallback */ |
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memcpy(&key->k, inkey, GHASH_BLOCK_SIZE); |
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ghash_reflect(key->h[0], &key->k); |
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if (static_branch_likely(&use_p64)) { |
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be128 h = key->k; |
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gf128mul_lle(&h, &key->k); |
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ghash_reflect(key->h[1], &h); |
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gf128mul_lle(&h, &key->k); |
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ghash_reflect(key->h[2], &h); |
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gf128mul_lle(&h, &key->k); |
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ghash_reflect(key->h[3], &h); |
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} |
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return 0; |
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} |
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static struct shash_alg ghash_alg = { |
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.digestsize = GHASH_DIGEST_SIZE, |
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.init = ghash_init, |
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.update = ghash_update, |
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.final = ghash_final, |
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.setkey = ghash_setkey, |
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.descsize = sizeof(struct ghash_desc_ctx), |
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.base.cra_name = "ghash", |
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.base.cra_driver_name = "ghash-ce-sync", |
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.base.cra_priority = 300 - 1, |
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.base.cra_blocksize = GHASH_BLOCK_SIZE, |
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.base.cra_ctxsize = sizeof(struct ghash_key) + sizeof(u64[2]), |
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.base.cra_module = THIS_MODULE, |
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}; |
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static int ghash_async_init(struct ahash_request *req) |
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{ |
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struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); |
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struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm); |
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struct ahash_request *cryptd_req = ahash_request_ctx(req); |
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struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm; |
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struct shash_desc *desc = cryptd_shash_desc(cryptd_req); |
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struct crypto_shash *child = cryptd_ahash_child(cryptd_tfm); |
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desc->tfm = child; |
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return crypto_shash_init(desc); |
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} |
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static int ghash_async_update(struct ahash_request *req) |
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{ |
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struct ahash_request *cryptd_req = ahash_request_ctx(req); |
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struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); |
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struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm); |
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struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm; |
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if (!crypto_simd_usable() || |
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(in_atomic() && cryptd_ahash_queued(cryptd_tfm))) { |
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memcpy(cryptd_req, req, sizeof(*req)); |
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ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base); |
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return crypto_ahash_update(cryptd_req); |
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} else { |
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struct shash_desc *desc = cryptd_shash_desc(cryptd_req); |
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return shash_ahash_update(req, desc); |
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} |
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} |
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static int ghash_async_final(struct ahash_request *req) |
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{ |
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struct ahash_request *cryptd_req = ahash_request_ctx(req); |
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struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); |
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struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm); |
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struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm; |
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if (!crypto_simd_usable() || |
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(in_atomic() && cryptd_ahash_queued(cryptd_tfm))) { |
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memcpy(cryptd_req, req, sizeof(*req)); |
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ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base); |
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return crypto_ahash_final(cryptd_req); |
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} else { |
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struct shash_desc *desc = cryptd_shash_desc(cryptd_req); |
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return crypto_shash_final(desc, req->result); |
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} |
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} |
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static int ghash_async_digest(struct ahash_request *req) |
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{ |
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struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); |
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struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm); |
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struct ahash_request *cryptd_req = ahash_request_ctx(req); |
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struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm; |
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if (!crypto_simd_usable() || |
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(in_atomic() && cryptd_ahash_queued(cryptd_tfm))) { |
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memcpy(cryptd_req, req, sizeof(*req)); |
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ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base); |
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return crypto_ahash_digest(cryptd_req); |
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} else { |
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struct shash_desc *desc = cryptd_shash_desc(cryptd_req); |
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struct crypto_shash *child = cryptd_ahash_child(cryptd_tfm); |
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desc->tfm = child; |
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return shash_ahash_digest(req, desc); |
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} |
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} |
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static int ghash_async_import(struct ahash_request *req, const void *in) |
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{ |
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struct ahash_request *cryptd_req = ahash_request_ctx(req); |
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struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); |
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struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm); |
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struct shash_desc *desc = cryptd_shash_desc(cryptd_req); |
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desc->tfm = cryptd_ahash_child(ctx->cryptd_tfm); |
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return crypto_shash_import(desc, in); |
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} |
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static int ghash_async_export(struct ahash_request *req, void *out) |
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{ |
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struct ahash_request *cryptd_req = ahash_request_ctx(req); |
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struct shash_desc *desc = cryptd_shash_desc(cryptd_req); |
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return crypto_shash_export(desc, out); |
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} |
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static int ghash_async_setkey(struct crypto_ahash *tfm, const u8 *key, |
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unsigned int keylen) |
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{ |
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struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm); |
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struct crypto_ahash *child = &ctx->cryptd_tfm->base; |
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crypto_ahash_clear_flags(child, CRYPTO_TFM_REQ_MASK); |
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crypto_ahash_set_flags(child, crypto_ahash_get_flags(tfm) |
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& CRYPTO_TFM_REQ_MASK); |
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return crypto_ahash_setkey(child, key, keylen); |
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} |
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static int ghash_async_init_tfm(struct crypto_tfm *tfm) |
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{ |
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struct cryptd_ahash *cryptd_tfm; |
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struct ghash_async_ctx *ctx = crypto_tfm_ctx(tfm); |
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cryptd_tfm = cryptd_alloc_ahash("ghash-ce-sync", 0, 0); |
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if (IS_ERR(cryptd_tfm)) |
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return PTR_ERR(cryptd_tfm); |
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ctx->cryptd_tfm = cryptd_tfm; |
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crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm), |
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sizeof(struct ahash_request) + |
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crypto_ahash_reqsize(&cryptd_tfm->base)); |
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return 0; |
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} |
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static void ghash_async_exit_tfm(struct crypto_tfm *tfm) |
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{ |
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struct ghash_async_ctx *ctx = crypto_tfm_ctx(tfm); |
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cryptd_free_ahash(ctx->cryptd_tfm); |
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} |
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static struct ahash_alg ghash_async_alg = { |
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.init = ghash_async_init, |
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.update = ghash_async_update, |
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.final = ghash_async_final, |
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.setkey = ghash_async_setkey, |
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.digest = ghash_async_digest, |
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.import = ghash_async_import, |
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.export = ghash_async_export, |
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.halg.digestsize = GHASH_DIGEST_SIZE, |
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.halg.statesize = sizeof(struct ghash_desc_ctx), |
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.halg.base = { |
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.cra_name = "ghash", |
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.cra_driver_name = "ghash-ce", |
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.cra_priority = 300, |
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.cra_flags = CRYPTO_ALG_ASYNC, |
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.cra_blocksize = GHASH_BLOCK_SIZE, |
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.cra_ctxsize = sizeof(struct ghash_async_ctx), |
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.cra_module = THIS_MODULE, |
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.cra_init = ghash_async_init_tfm, |
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.cra_exit = ghash_async_exit_tfm, |
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}, |
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}; |
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static int __init ghash_ce_mod_init(void) |
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{ |
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int err; |
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if (!(elf_hwcap & HWCAP_NEON)) |
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return -ENODEV; |
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if (elf_hwcap2 & HWCAP2_PMULL) { |
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ghash_alg.base.cra_ctxsize += 3 * sizeof(u64[2]); |
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static_branch_enable(&use_p64); |
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} |
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err = crypto_register_shash(&ghash_alg); |
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if (err) |
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return err; |
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err = crypto_register_ahash(&ghash_async_alg); |
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if (err) |
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goto err_shash; |
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return 0; |
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err_shash: |
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crypto_unregister_shash(&ghash_alg); |
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return err; |
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} |
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static void __exit ghash_ce_mod_exit(void) |
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{ |
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crypto_unregister_ahash(&ghash_async_alg); |
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crypto_unregister_shash(&ghash_alg); |
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} |
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module_init(ghash_ce_mod_init); |
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module_exit(ghash_ce_mod_exit);
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