383 lines
15 KiB
C
383 lines
15 KiB
C
// Monocypher version 3.1.2
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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 __cplusplus
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extern "C" {
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#endif
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////////////////////////
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/// Type definitions ///
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////////////////////////
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// Vtable for EdDSA with a custom hash.
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// Instantiate it to define a custom hash.
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// Its size, contents, and layout, are part of the public API.
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typedef struct {
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void (*hash)(uint8_t hash[64], const uint8_t *message, size_t message_size);
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void (*init )(void *ctx);
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void (*update)(void *ctx, const uint8_t *message, size_t message_size);
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void (*final )(void *ctx, uint8_t hash[64]);
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size_t ctx_size;
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} crypto_sign_vtable;
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// Do not rely on the size or contents of any of the types below,
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// they may change without notice.
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// Poly1305
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typedef struct {
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uint32_t r[4]; // constant multiplier (from the secret key)
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uint32_t h[5]; // accumulated hash
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uint32_t c[5]; // chunk of the message
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uint32_t pad[4]; // random number added at the end (from the secret key)
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size_t c_idx; // How many bytes are there in the chunk.
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} crypto_poly1305_ctx;
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// Hash (Blake2b)
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typedef struct {
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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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// Signatures (EdDSA)
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typedef struct {
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const crypto_sign_vtable *hash;
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uint8_t buf[96];
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uint8_t pk [32];
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} crypto_sign_ctx_abstract;
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typedef crypto_sign_ctx_abstract crypto_check_ctx_abstract;
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typedef struct {
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crypto_sign_ctx_abstract ctx;
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crypto_blake2b_ctx hash;
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} crypto_sign_ctx;
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typedef crypto_sign_ctx crypto_check_ctx;
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////////////////////////////
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/// High level interface ///
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////////////////////////////
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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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// Please erase all copies
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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_lock(uint8_t mac[16],
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uint8_t *cipher_text,
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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 *plain_text, size_t text_size);
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int crypto_unlock(uint8_t *plain_text,
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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 mac[16],
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const uint8_t *cipher_text, size_t text_size);
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// With additional data
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void crypto_lock_aead(uint8_t mac[16],
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uint8_t *cipher_text,
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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_unlock_aead(uint8_t *plain_text,
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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 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[64],
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const uint8_t *message, size_t message_size);
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void crypto_blake2b_general(uint8_t *hash , size_t hash_size,
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const uint8_t *key , size_t key_size, // optional
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const uint8_t *message, size_t message_size);
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// Incremental interface
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void crypto_blake2b_init (crypto_blake2b_ctx *ctx);
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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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void crypto_blake2b_general_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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// vtable for signatures
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extern const crypto_sign_vtable crypto_blake2b_vtable;
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// Password key derivation (Argon2 i)
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// ----------------------------------
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void crypto_argon2i(uint8_t *hash, uint32_t hash_size, // >= 4
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void *work_area, uint32_t nb_blocks, // >= 8
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uint32_t nb_iterations, // >= 3
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const uint8_t *password, uint32_t password_size,
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const uint8_t *salt, uint32_t salt_size); // >= 8
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void crypto_argon2i_general(uint8_t *hash, uint32_t hash_size,// >= 4
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void *work_area, uint32_t nb_blocks,// >= 8
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uint32_t nb_iterations, // >= 3
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const uint8_t *password, uint32_t password_size,
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const uint8_t *salt, uint32_t salt_size,// >= 8
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const uint8_t *key, uint32_t key_size,
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const uint8_t *ad, uint32_t ad_size);
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// Key exchange (x25519 + HChacha20)
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// ---------------------------------
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#define crypto_key_exchange_public_key crypto_x25519_public_key
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void crypto_key_exchange(uint8_t shared_key [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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// Signatures (EdDSA with curve25519 + Blake2b)
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// --------------------------------------------
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// Generate public key
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void crypto_sign_public_key(uint8_t public_key[32],
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const uint8_t secret_key[32]);
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// Direct interface
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void crypto_sign(uint8_t signature [64],
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const uint8_t secret_key[32],
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const uint8_t public_key[32], // optional, may be 0
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const uint8_t *message, size_t message_size);
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int crypto_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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////////////////////////////
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/// Low level primitives ///
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////////////////////////////
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// For experts only. You have been warned.
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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_hchacha20(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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void crypto_chacha20(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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void crypto_xchacha20(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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void crypto_ietf_chacha20(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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uint64_t crypto_chacha20_ctr(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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uint64_t crypto_xchacha20_ctr(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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uint32_t crypto_ietf_chacha20_ctr(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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// 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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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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// 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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// "Dirty" versions of x25519_public_key()
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// Only use to generate ephemeral keys you want to hide.
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// Note that those functions 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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// 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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// EdDSA to X25519
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// ---------------
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void crypto_from_eddsa_private(uint8_t x25519[32], const uint8_t eddsa[32]);
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void crypto_from_eddsa_public (uint8_t x25519[32], const uint8_t eddsa[32]);
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// EdDSA -- Incremental interface
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// ------------------------------
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// Signing (2 passes)
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// Make sure the two passes hash the same message,
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// else you might reveal the private key.
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void crypto_sign_init_first_pass(crypto_sign_ctx_abstract *ctx,
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const uint8_t secret_key[32],
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const uint8_t public_key[32]);
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void crypto_sign_update(crypto_sign_ctx_abstract *ctx,
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const uint8_t *message, size_t message_size);
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void crypto_sign_init_second_pass(crypto_sign_ctx_abstract *ctx);
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// use crypto_sign_update() again.
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void crypto_sign_final(crypto_sign_ctx_abstract *ctx, uint8_t signature[64]);
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// Verification (1 pass)
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// Make sure you don't use (parts of) the message
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// before you're done checking it.
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void crypto_check_init (crypto_check_ctx_abstract *ctx,
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const uint8_t signature[64],
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const uint8_t public_key[32]);
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void crypto_check_update(crypto_check_ctx_abstract *ctx,
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const uint8_t *message, size_t message_size);
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int crypto_check_final (crypto_check_ctx_abstract *ctx);
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// Custom hash interface
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void crypto_sign_public_key_custom_hash(uint8_t public_key[32],
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const uint8_t secret_key[32],
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const crypto_sign_vtable *hash);
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void crypto_sign_init_first_pass_custom_hash(crypto_sign_ctx_abstract *ctx,
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const uint8_t secret_key[32],
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const uint8_t public_key[32],
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const crypto_sign_vtable *hash);
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void crypto_check_init_custom_hash(crypto_check_ctx_abstract *ctx,
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const uint8_t signature[64],
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const uint8_t public_key[32],
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const crypto_sign_vtable *hash);
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// Elligator 2
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// -----------
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// Elligator mappings proper
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void crypto_hidden_to_curve(uint8_t curve [32], const uint8_t hidden[32]);
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int crypto_curve_to_hidden(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_hidden_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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