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/*
* The MIT License (MIT)
*
* Copyright (c) 2015 Andrew Moon, Vsevolod Stakhov
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef CHACHA_H_
#define CHACHA_H_
#define CHACHA_BLOCKBYTES 64
#ifdef __cplusplus
extern "C" {
#endif
typedef struct chacha_state_internal_t {
unsigned char s[48];
size_t rounds;
size_t leftover;
unsigned char buffer[CHACHA_BLOCKBYTES];
} chacha_state_internal;
typedef struct chacha_state_t {
unsigned char opaque[128];
} chacha_state;
typedef struct chacha_key_t {
unsigned char b[32];
} chacha_key;
typedef struct chacha_iv_t {
unsigned char b[8];
} chacha_iv;
typedef struct chacha_iv24_t {
unsigned char b[24];
} chacha_iv24;
void hchacha (const unsigned char key[32], const unsigned char iv[16],
unsigned char out[32], size_t rounds);
void chacha_init (chacha_state *S, const chacha_key *key, const chacha_iv *iv,
size_t rounds);
void xchacha_init (chacha_state *S, const chacha_key *key,
const chacha_iv24 *iv, size_t rounds);
size_t chacha_update (chacha_state *S, const unsigned char *in,
unsigned char *out, size_t inlen);
size_t chacha_final (chacha_state *S, unsigned char *out);
void chacha (const chacha_key *key, const chacha_iv *iv,
const unsigned char *in, unsigned char *out, size_t inlen,
size_t rounds);
void xchacha (const chacha_key *key, const chacha_iv24 *iv,
const unsigned char *in, unsigned char *out, size_t inlen,
size_t rounds);
const char *chacha_load (void);
#ifdef __cplusplus
}
#endif
#endif /* CHACHA_H_ */
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