211 lines
6.0 KiB
Plaintext
211 lines
6.0 KiB
Plaintext
.\" This file is dual-licensed. Choose whichever you want.
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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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.\" Copyright (c) 2017 Michael Savage
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.\" Copyright (c) 2017, 2019 Fabio Scotoni
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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, Michael Savage and Fabio Scotoni
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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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.\"
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.Dd December 12, 2019
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.Dt CRYPTO_LOCK_INIT 3MONOCYPHER
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.Os
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.Sh NAME
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.Nm crypto_lock_init ,
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.Nm crypto_lock_auth_ad ,
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.Nm crypto_lock_auth_message ,
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.Nm crypto_lock_update ,
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.Nm crypto_lock_final ,
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.Nm crypto_unlock_init ,
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.Nm crypto_unlock_auth_ad ,
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.Nm crypto_unlock_auth_message ,
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.Nm crypto_unlock_update ,
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.Nm crypto_unlock_final
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.Nd incremental authenticated encryption with additional data
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.Sh SYNOPSIS
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.In monocypher.h
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.Ft void
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.Fo crypto_lock_init
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.Fa "crypto_lock_ctx *ctx"
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.Fa "const uint8_t key[32]"
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.Fa "const uint8_t nonce[24]"
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.Fc
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.Ft void
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.Fo crypto_lock_auth_ad
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.Fa "crypto_lock_ctx *ctx"
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.Fa "const uint8_t *ad"
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.Fa "size_t ad_size"
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.Fc
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.Ft void
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.Fo crypto_lock_auth_message
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.Fa "crypto_lock_ctx *ctx"
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.Fa "const uint8_t *plain_text"
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.Fa "size_t text_size"
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.Fc
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.Ft void
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.Fo crypto_lock_update
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.Fa "crypto_lock_ctx *ctx"
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.Fa "uint8_t *cipher_text"
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.Fa "const uint8_t *plain_text"
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.Fa "size_t text_size"
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.Fc
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.Ft void
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.Fo crypto_lock_final
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.Fa "crypto_lock_ctx *ctx"
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.Fa "uint8_t mac[16]"
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.Fc
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.Ft void
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.Fo crypto_unlock_init
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.Fa "crypto_unlock_ctx *ctx"
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.Fa "const uint8_t key[32]"
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.Fa "const uint8_t nonce[24]"
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.Fc
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.Ft void
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.Fo crypto_unlock_auth_ad
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.Fa "crypto_unlock_ctx *ctx"
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.Fa "const uint8_t *ad"
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.Fa "size_t ad_size"
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.Fc
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.Ft void
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.Fo crypto_unlock_auth_message
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.Fa "crypto_unlock_ctx *ctx"
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.Fa "const uint8_t *plain_text"
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.Fa "size_t text_size"
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.Fc
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.Ft void
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.Fo crypto_unlock_update
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.Fa "crypto_unlock_ctx *ctx"
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.Fa "uint8_t *plain_text"
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.Fa "const uint8_t *cipher_text"
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.Fa "size_t text_size"
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.Fc
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.Ft int
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.Fo crypto_unlock_final
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.Fa "crypto_unlock_ctx *ctx"
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.Fa "const uint8_t mac[16]"
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.Fc
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.Sh DESCRIPTION
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These functions were variants of
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.Xr crypto_lock 3monocypher ,
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.Xr crypto_unlock 3monocypher ,
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.Xr crypto_lock_aead 3monocypher
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and
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.Xr crypto_unlock_aead 3monocypher .
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They are deprecated in favor of
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those simpler functions.
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.Pp
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Change your protocol so that it does not rely on the removed functions,
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namely by splitting the data into chunks that you can individually use
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.Xr crypto_lock 3monocypher
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and
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.Xr crypto_unlock 3monocypher
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on.
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.Pp
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For files in particular,
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you may alternatively (and suboptimally)
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attempt to use
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.Fn mmap
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(on *NIX)
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or
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.Fn MapViewOfFile
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(on Windows)
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and pass the files as mapped memory into
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.Xr crypto_lock 3monocypher
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and
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.Xr crypto_unlock 3monocypher
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instead.
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.El
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.Sh RETURN VALUES
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.Fn crypto_lock_init ,
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.Fn crypto_unlock_init ,
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.Fn crypto_lock_auth_ad ,
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.Fn crypto_unlock_auth_ad ,
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.Fn crypto_lock_auth_message ,
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.Fn crypto_unlock_auth_message ,
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.Fn crypto_lock_update ,
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.Fn crypto_unlock_update ,
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and
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.Fn crypto_lock_final
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return nothing.
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.Pp
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.Fn crypto_unlock_final
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returns 0 on success or -1 if the message was corrupted.
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Corruption can be caused by transmission errors, programmer error, or an
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attacker's interference.
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.Em Always check the return value .
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.Sh SEE ALSO
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.Xr crypto_key_exchange 3monocypher ,
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.Xr crypto_lock 3monocypher ,
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.Xr crypto_lock_aead 3monocypher ,
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.Xr crypto_unlock 3monocypher ,
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.Xr crypto_unlock_aead 3monocypher ,
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.Xr crypto_wipe 3monocypher ,
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.Xr intro 3monocypher
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.Sh HISTORY
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The
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.Fn crypto_lock_init ,
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.Fn crypto_lock_auth_ad ,
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.Fn crypto_lock_auth_message ,
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.Fn crypto_lock_update ,
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.Fn crypto_lock_final ,
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.Fn crypto_unlock_init ,
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.Fn crypto_unlock_auth_ad ,
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.Fn crypto_unlock_auth_message ,
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.Fn crypto_unlock_update ,
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and
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.Fn crypto_unlock_final
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functions first appeared in Monocypher 1.1.0.
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.Fn crypto_lock_aead_auth
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and
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.Fn crypto_unlock_aead_auth
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were renamed to
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.Fn crypto_lock_auth_ad
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and
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.Fn crypto_unlock_auth_ad
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respectively in Monocypher 2.0.0.
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They were deprecated in Monocypher 3.0.0
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and will be removed in Monocypher 4.0.0.
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