| /*- |
| * 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_ */ |
