mirror of https://github.com/OpenTTD/OpenTTD.git
322 lines
12 KiB
C++
322 lines
12 KiB
C++
// Monocypher version 4.0.2
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//
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// This file is dual-licensed. Choose whichever licence you want from
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// the two licences listed below.
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//
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// The first licence is a regular 2-clause BSD licence. The second licence
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// is the CC-0 from Creative Commons. It is intended to release Monocypher
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// to the public domain. The BSD licence serves as a fallback option.
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//
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// SPDX-License-Identifier: BSD-2-Clause OR CC0-1.0
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//
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// ------------------------------------------------------------------------
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//
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// Copyright (c) 2017-2019, Loup Vaillant
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// All rights reserved.
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//
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// 1. Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the
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// distribution.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// ------------------------------------------------------------------------
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//
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// Written in 2017-2019 by Loup Vaillant
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//
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// To the extent possible under law, the author(s) have dedicated all copyright
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// and related neighboring rights to this software to the public domain
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// worldwide. This software is distributed without any warranty.
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//
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// You should have received a copy of the CC0 Public Domain Dedication along
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// with this software. If not, see
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// <https://creativecommons.org/publicdomain/zero/1.0/>
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#ifndef MONOCYPHER_H
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#define MONOCYPHER_H
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#include <stddef.h>
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#include <stdint.h>
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#ifdef MONOCYPHER_CPP_NAMESPACE
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namespace MONOCYPHER_CPP_NAMESPACE {
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#elif defined(__cplusplus)
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extern "C" {
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#endif
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// Constant time comparisons
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// -------------------------
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// Return 0 if a and b are equal, -1 otherwise
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int crypto_verify16(const uint8_t a[16], const uint8_t b[16]);
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int crypto_verify32(const uint8_t a[32], const uint8_t b[32]);
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int crypto_verify64(const uint8_t a[64], const uint8_t b[64]);
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// Erase sensitive data
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// --------------------
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void crypto_wipe(void *secret, size_t size);
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// Authenticated encryption
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// ------------------------
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void crypto_aead_lock(uint8_t *cipher_text,
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uint8_t mac [16],
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const uint8_t key [32],
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const uint8_t nonce[24],
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const uint8_t *ad, size_t ad_size,
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const uint8_t *plain_text, size_t text_size);
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int crypto_aead_unlock(uint8_t *plain_text,
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const uint8_t mac [16],
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const uint8_t key [32],
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const uint8_t nonce[24],
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const uint8_t *ad, size_t ad_size,
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const uint8_t *cipher_text, size_t text_size);
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// Authenticated stream
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// --------------------
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typedef struct {
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uint64_t counter;
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uint8_t key[32];
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uint8_t nonce[8];
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} crypto_aead_ctx;
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void crypto_aead_init_x(crypto_aead_ctx *ctx,
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const uint8_t key[32], const uint8_t nonce[24]);
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void crypto_aead_init_djb(crypto_aead_ctx *ctx,
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const uint8_t key[32], const uint8_t nonce[8]);
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void crypto_aead_init_ietf(crypto_aead_ctx *ctx,
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const uint8_t key[32], const uint8_t nonce[12]);
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void crypto_aead_write(crypto_aead_ctx *ctx,
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uint8_t *cipher_text,
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uint8_t mac[16],
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const uint8_t *ad , size_t ad_size,
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const uint8_t *plain_text, size_t text_size);
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int crypto_aead_read(crypto_aead_ctx *ctx,
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uint8_t *plain_text,
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const uint8_t mac[16],
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const uint8_t *ad , size_t ad_size,
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const uint8_t *cipher_text, size_t text_size);
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// General purpose hash (BLAKE2b)
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// ------------------------------
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// Direct interface
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void crypto_blake2b(uint8_t *hash, size_t hash_size,
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const uint8_t *message, size_t message_size);
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void crypto_blake2b_keyed(uint8_t *hash, size_t hash_size,
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const uint8_t *key, size_t key_size,
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const uint8_t *message, size_t message_size);
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// Incremental interface
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typedef struct {
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// Do not rely on the size or contents of this type,
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// for they may change without notice.
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uint64_t hash[8];
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uint64_t input_offset[2];
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uint64_t input[16];
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size_t input_idx;
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size_t hash_size;
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} crypto_blake2b_ctx;
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void crypto_blake2b_init(crypto_blake2b_ctx *ctx, size_t hash_size);
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void crypto_blake2b_keyed_init(crypto_blake2b_ctx *ctx, size_t hash_size,
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const uint8_t *key, size_t key_size);
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void crypto_blake2b_update(crypto_blake2b_ctx *ctx,
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const uint8_t *message, size_t message_size);
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void crypto_blake2b_final(crypto_blake2b_ctx *ctx, uint8_t *hash);
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// Password key derivation (Argon2)
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// --------------------------------
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#define CRYPTO_ARGON2_D 0
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#define CRYPTO_ARGON2_I 1
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#define CRYPTO_ARGON2_ID 2
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typedef struct {
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uint32_t algorithm; // Argon2d, Argon2i, Argon2id
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uint32_t nb_blocks; // memory hardness, >= 8 * nb_lanes
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uint32_t nb_passes; // CPU hardness, >= 1 (>= 3 recommended for Argon2i)
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uint32_t nb_lanes; // parallelism level (single threaded anyway)
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} crypto_argon2_config;
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typedef struct {
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const uint8_t *pass;
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const uint8_t *salt;
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uint32_t pass_size;
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uint32_t salt_size; // 16 bytes recommended
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} crypto_argon2_inputs;
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typedef struct {
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const uint8_t *key; // may be NULL if no key
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const uint8_t *ad; // may be NULL if no additional data
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uint32_t key_size; // 0 if no key (32 bytes recommended otherwise)
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uint32_t ad_size; // 0 if no additional data
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} crypto_argon2_extras;
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extern const crypto_argon2_extras crypto_argon2_no_extras;
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void crypto_argon2(uint8_t *hash, uint32_t hash_size, void *work_area,
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crypto_argon2_config config,
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crypto_argon2_inputs inputs,
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crypto_argon2_extras extras);
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// Key exchange (X-25519)
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// ----------------------
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// Shared secrets are not quite random.
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// Hash them to derive an actual shared key.
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void crypto_x25519_public_key(uint8_t public_key[32],
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const uint8_t secret_key[32]);
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void crypto_x25519(uint8_t raw_shared_secret[32],
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const uint8_t your_secret_key [32],
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const uint8_t their_public_key [32]);
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// Conversion to EdDSA
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void crypto_x25519_to_eddsa(uint8_t eddsa[32], const uint8_t x25519[32]);
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// scalar "division"
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// Used for OPRF. Be aware that exponential blinding is less secure
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// than Diffie-Hellman key exchange.
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void crypto_x25519_inverse(uint8_t blind_salt [32],
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const uint8_t private_key[32],
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const uint8_t curve_point[32]);
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// "Dirty" versions of x25519_public_key().
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// Use with crypto_elligator_rev().
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// Leaks 3 bits of the private key.
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void crypto_x25519_dirty_small(uint8_t pk[32], const uint8_t sk[32]);
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void crypto_x25519_dirty_fast (uint8_t pk[32], const uint8_t sk[32]);
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// Signatures
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// ----------
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// EdDSA with curve25519 + BLAKE2b
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void crypto_eddsa_key_pair(uint8_t secret_key[64],
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uint8_t public_key[32],
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uint8_t seed[32]);
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void crypto_eddsa_sign(uint8_t signature [64],
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const uint8_t secret_key[64],
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const uint8_t *message, size_t message_size);
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int crypto_eddsa_check(const uint8_t signature [64],
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const uint8_t public_key[32],
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const uint8_t *message, size_t message_size);
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// Conversion to X25519
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void crypto_eddsa_to_x25519(uint8_t x25519[32], const uint8_t eddsa[32]);
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// EdDSA building blocks
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void crypto_eddsa_trim_scalar(uint8_t out[32], const uint8_t in[32]);
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void crypto_eddsa_reduce(uint8_t reduced[32], const uint8_t expanded[64]);
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void crypto_eddsa_mul_add(uint8_t r[32],
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const uint8_t a[32],
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const uint8_t b[32],
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const uint8_t c[32]);
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void crypto_eddsa_scalarbase(uint8_t point[32], const uint8_t scalar[32]);
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int crypto_eddsa_check_equation(const uint8_t signature[64],
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const uint8_t public_key[32],
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const uint8_t h_ram[32]);
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// Chacha20
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// --------
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// Specialised hash.
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// Used to hash X25519 shared secrets.
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void crypto_chacha20_h(uint8_t out[32],
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const uint8_t key[32],
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const uint8_t in [16]);
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// Unauthenticated stream cipher.
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// Don't forget to add authentication.
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uint64_t crypto_chacha20_djb(uint8_t *cipher_text,
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const uint8_t *plain_text,
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size_t text_size,
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const uint8_t key[32],
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const uint8_t nonce[8],
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uint64_t ctr);
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uint32_t crypto_chacha20_ietf(uint8_t *cipher_text,
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const uint8_t *plain_text,
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size_t text_size,
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const uint8_t key[32],
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const uint8_t nonce[12],
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uint32_t ctr);
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uint64_t crypto_chacha20_x(uint8_t *cipher_text,
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const uint8_t *plain_text,
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size_t text_size,
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const uint8_t key[32],
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const uint8_t nonce[24],
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uint64_t ctr);
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// Poly 1305
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// ---------
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// This is a *one time* authenticator.
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// Disclosing the mac reveals the key.
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// See crypto_lock() on how to use it properly.
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// Direct interface
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void crypto_poly1305(uint8_t mac[16],
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const uint8_t *message, size_t message_size,
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const uint8_t key[32]);
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// Incremental interface
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typedef struct {
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// Do not rely on the size or contents of this type,
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// for they may change without notice.
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uint8_t c[16]; // chunk of the message
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size_t c_idx; // How many bytes are there in the chunk.
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uint32_t r [4]; // constant multiplier (from the secret key)
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uint32_t pad[4]; // random number added at the end (from the secret key)
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uint32_t h [5]; // accumulated hash
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} crypto_poly1305_ctx;
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void crypto_poly1305_init (crypto_poly1305_ctx *ctx, const uint8_t key[32]);
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void crypto_poly1305_update(crypto_poly1305_ctx *ctx,
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const uint8_t *message, size_t message_size);
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void crypto_poly1305_final (crypto_poly1305_ctx *ctx, uint8_t mac[16]);
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// Elligator 2
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// -----------
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// Elligator mappings proper
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void crypto_elligator_map(uint8_t curve [32], const uint8_t hidden[32]);
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int crypto_elligator_rev(uint8_t hidden[32], const uint8_t curve [32],
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uint8_t tweak);
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// Easy to use key pair generation
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void crypto_elligator_key_pair(uint8_t hidden[32], uint8_t secret_key[32],
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uint8_t seed[32]);
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#ifdef __cplusplus
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}
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#endif
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#endif // MONOCYPHER_H
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