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927e01da02
The previous implementation of DCRYPTO_app_cipher
consumed roughly 16ms to cipher a 16kB buffer
(i.e. performance that is far worse than the
hardware is capable of).
This change speeds up the implementation by about
85%, to the tune of roughly 2.2ms for a 16kB buffer.
The gains originate from various sources: loop
unrolling, data-pipelining, eliminating local
variables (to reduce register pressure), eliminating
support for unaligned input/output data, compiling
hot code with -O (rather the default -Os), and
using the hidden key-ladder, which need only be
setup once per reset.
This change also switches from AES-128 to AES-256.
BRANCH=none
BUG=chrome-os-partner:62260
TEST=make buildall succeeds;
cipher command succeeds;
TCG tests pass
Change-Id: I133741be6d9f1353d6ae732d0e863b4b18cc8c9e
Signed-off-by: nagendra modadugu <ngm@google.com>
Reviewed-on: https://chromium-review.googlesource.com/433359
Commit-Ready: Nagendra Modadugu <ngm@google.com>
Tested-by: Nagendra Modadugu <ngm@google.com>
Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
32 lines
835 B
C
32 lines
835 B
C
/*
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* Copyright 2017 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "crypto_api.h"
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#include "dcrypto.h"
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void app_compute_hash(uint8_t *p_buf, size_t num_bytes,
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uint8_t *p_hash, size_t hash_len)
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{
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uint8_t sha1_digest[SHA_DIGEST_SIZE];
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/*
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* Use the built in dcrypto engine to generate the sha1 hash of the
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* buffer.
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*/
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DCRYPTO_SHA1_hash((uint8_t *)p_buf, num_bytes, sha1_digest);
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memcpy(p_hash, sha1_digest, MIN(hash_len, sizeof(sha1_digest)));
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if (hash_len > sizeof(sha1_digest))
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memset(p_hash + sizeof(sha1_digest), 0,
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hash_len - sizeof(sha1_digest));
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}
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int app_cipher(const void *salt, void *out, const void *in, size_t size)
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{
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return DCRYPTO_app_cipher(NVMEM, salt, out, in, size);
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}
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