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edc668ea6c
- Move generic implementation to curve25519-generic.o
- Always use optimized version on cortex-m0.
- Rename .s files to .S, remove unnecessary lines in assembly files.
- Rename crypto_scalarmult_curve25519 to x25519_scalar_mult to match
the signature provided by the generic implementation.
- Replace some handcoded memcpy with function calls
- Remove unnecessary "volatile" specifications in the code.
BRANCH=none
BUG=b:62813194
TEST=To test old implementation only:
- Increase CONFIG_RO_SIZE to 60kb
- Increase console stack size to 2048
make BOARD=hammer PROJECT=x25519 TEST_BUILD=y
./util/flash_ec --board=hammer --image=build/hammer/x25519.bin
EC console: runtest, taskinfo
=> Used to takes ~4'17" to run (X25519 duration 256347 us).
1496/2048 stack size usage in CONSOLE task
=> Now takes ~1'25" to run (X25519 duration 84520 us)
732/2048 stack size usage in CONSOLE task
TEST=In test/x25519.c, uncomment #define TEST_X25519_1M_ITERATIONS
make BOARD=hammer PROJECT=x25519 TEST_BUILD=y
./util/flash_ec --board=hammer --image=build/hammer/x25519.bin
EC console: runtest, wait ~23 hours, test passes.
TEST=- Define CONFIG_CURVE25519_CORTEXM0 (next patch)
makes newsizes
build/hammer/RW/ec.RW.flat shrank by 1888 bytes: (52208 to 50320)
Change-Id: Icce38d3c32f431a85ac0f951cf34456b490dc665
Reviewed-on: https://chromium-review.googlesource.com/540962
Commit-Ready: Nicolas Boichat <drinkcat@chromium.org>
Tested-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>
71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
/* 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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#ifndef __CROS_EC_CURVE25519_H
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#define __CROS_EC_CURVE25519_H
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#include <stdint.h>
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/* Curve25519.
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*
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* Curve25519 is an elliptic curve. See https://tools.ietf.org/html/rfc7748.
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*/
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/* X25519.
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*
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* X25519 is the Diffie-Hellman primitive built from curve25519. It is
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* sometimes referred to as “curve25519”, but “X25519” is a more precise
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* name.
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* See http://cr.yp.to/ecdh.html and https://tools.ietf.org/html/rfc7748.
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*/
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#define X25519_PRIVATE_KEY_LEN 32
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#define X25519_PUBLIC_VALUE_LEN 32
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/**
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* Generate a public/private key pair.
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* @param out_public_value generated public key.
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* @param out_private_value generated private key.
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*/
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void X25519_keypair(uint8_t out_public_value[32], uint8_t out_private_key[32]);
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/**
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* Diffie-Hellman function.
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* @param out_shared_key
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* @param private_key
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* @param out_public_value
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* @return one on success and zero on error.
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*
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* X25519() writes a shared key to @out_shared_key that is calculated from the
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* given private key and the peer's public value.
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*
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* Don't use the shared key directly, rather use a KDF and also include the two
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* public values as inputs.
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*/
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int X25519(uint8_t out_shared_key[32], const uint8_t private_key[32],
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const uint8_t peers_public_value[32]);
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/**
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* Compute the matching public key.
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* @param out_public_value computed public key.
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* @param private_key private key to use.
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*
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* X25519_public_from_private() calculates a Diffie-Hellman public value from
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* the given private key and writes it to @out_public_value.
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*/
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void X25519_public_from_private(uint8_t out_public_value[32],
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const uint8_t private_key[32]);
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/*
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* Low-level x25519 function, defined by either the generic or cortex-m0
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* implementation. Must not be called directly.
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*/
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void x25519_scalar_mult(uint8_t out[32],
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const uint8_t scalar[32],
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const uint8_t point[32]);
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#endif /* __CROS_EC_CURVE25519_H */
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