114 lines
2.9 KiB
C
114 lines
2.9 KiB
C
/*
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* Copyright (C) 2015 Martin Willi
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* Copyright (C) 2015 revosec AG
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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/**
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* @defgroup chapoly_drv chapoly_drv
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* @{ @ingroup chapoly
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*/
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#ifndef CHAPOLY_DRV_H_
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#define CHAPOLY_DRV_H_
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#include <library.h>
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#define CHACHA_BLOCK_SIZE 64
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#define CHACHA_IV_SIZE 8
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#define CHACHA_SALT_SIZE 4
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#define CHACHA_KEY_SIZE 32
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#define POLY_BLOCK_SIZE 16
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#define POLY_ICV_SIZE 16
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typedef struct chapoly_drv_t chapoly_drv_t;
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/**
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* ChaCha20/Poly1305 backend implementation.
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*/
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struct chapoly_drv_t {
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/**
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* Set the ChaCha20 encryption key.
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*
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* @param constant 16 byte key constant to use
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* @param key 32 byte encryption key
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* @param salt 4 byte nonce salt
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* @return TRUE if key set
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*/
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bool (*set_key)(chapoly_drv_t *this, u_char *constant, u_char *key,
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u_char *salt);
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/**
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* Start an AEAD en/decryption session, reset state.
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*
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* @param iv 8 byte initialization vector for nonce
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* @return TRUE if initialized
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*/
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bool (*init)(chapoly_drv_t *this, u_char *iv);
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/**
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* Poly1305 update multiple blocks.
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*
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* @param data data to update Poly1305 for
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* @param blocks number of 16-byte blocks to process
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* @return TRUE if updated
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*/
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bool (*poly)(chapoly_drv_t *this, u_char *data, u_int blocks);
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/**
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* Create a single ChaCha20 keystream block.
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*
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* @param stream 64-byte block to write key stream data to
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* @return TRUE if keystream returned
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*/
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bool (*chacha)(chapoly_drv_t *this, u_char *stream);
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/**
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* Encrypt multiple blocks of data inline, update Poly1305.
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*
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* @param data data to process
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* @param blocks number of 64-byte blocks to process
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* @return TRUE if encrypted
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*/
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bool (*encrypt)(chapoly_drv_t *this, u_char *data, u_int blocks);
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/**
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* Decrypt multiple blocks of data inline, update Poly1305.
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*
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* @param data data to process
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* @param blocks number of 64-byte blocks to process
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* @return TRUE if decrypted
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*/
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bool (*decrypt)(chapoly_drv_t *this, u_char *data, u_int blocks);
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/**
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* End a AEAD encryption session, return MAC.
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*
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* @param mac 16-byte block to write MAC to
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* @return TRUE if MAC returned
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*/
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bool (*finish)(chapoly_drv_t *this, u_char *mac);
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/**
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* Destroy a chapoly_drv_t.
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*/
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void (*destroy)(chapoly_drv_t *this);
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};
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/**
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* Create a chapoly_drv instance.
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*/
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chapoly_drv_t *chapoly_drv_probe();
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#endif /** CHAPOLY_DRV_H_ @}*/
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