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/*-
* Copyright 2009 Colin Percival
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file was originally written by Colin Percival as part of the Tarsnap
* online backup system.
*/
#ifndef _CRYPTO_AESCTR_H_
#define _CRYPTO_AESCTR_H_
#include <stdint.h>
#include <openssl/aes.h>
/**
* crypto_aesctr_init(key, nonce):
* Prepare to encrypt/decrypt data with AES in CTR mode, using the provided
* expanded key and nonce. The key provided must remain valid for the
* lifetime of the stream.
*/
struct crypto_aesctr * crypto_aesctr_init(AES_KEY *, uint64_t);
/**
* crypto_aesctr_stream(stream, inbuf, outbuf, buflen):
* Generate the next ${buflen} bytes of the AES-CTR stream and xor them with
* bytes from ${inbuf}, writing the result into ${outbuf}. If the buffers
* ${inbuf} and ${outbuf} overlap, they must be identical.
*/
void crypto_aesctr_stream(struct crypto_aesctr *, const uint8_t *,
uint8_t *, size_t);
/**
* crypto_aesctr_free(stream):
* Free the provided stream object.
*/
void crypto_aesctr_free(struct crypto_aesctr *);
#endif /* !_CRYPTO_AESCTR_H_ */
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