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#ifndef crypto_stream_chacha20_H
#define crypto_stream_chacha20_H
/*
* WARNING: This is just a stream cipher. It is NOT authenticated encryption.
* While it provides some protection against eavesdropping, it does NOT
* provide any security against active attacks.
* Unless you know what you're doing, what you are looking for is probably
* the crypto_box functions.
*/
#include <stddef.h>
#include <stdint.h>
#include "export.h"
#ifdef __cplusplus
# ifdef __GNUC__
# pragma GCC diagnostic ignored "-Wlong-long"
# endif
extern "C" {
#endif
#define crypto_stream_chacha20_KEYBYTES 32U
SODIUM_EXPORT
size_t crypto_stream_chacha20_keybytes(void);
#define crypto_stream_chacha20_NONCEBYTES 8U
SODIUM_EXPORT
size_t crypto_stream_chacha20_noncebytes(void);
#define crypto_stream_chacha20_MESSAGEBYTES_MAX SODIUM_SIZE_MAX
SODIUM_EXPORT
size_t crypto_stream_chacha20_messagebytes_max(void);
/* ChaCha20 with a 64-bit nonce and a 64-bit counter, as originally designed */
SODIUM_EXPORT
int crypto_stream_chacha20(unsigned char *c, unsigned long long clen,
const unsigned char *n, const unsigned char *k);
SODIUM_EXPORT
int crypto_stream_chacha20_xor(unsigned char *c, const unsigned char *m,
unsigned long long mlen, const unsigned char *n,
const unsigned char *k);
SODIUM_EXPORT
int crypto_stream_chacha20_xor_ic(unsigned char *c, const unsigned char *m,
unsigned long long mlen,
const unsigned char *n, uint64_t ic,
const unsigned char *k);
SODIUM_EXPORT
void crypto_stream_chacha20_keygen(unsigned char k[crypto_stream_chacha20_KEYBYTES]);
/* ChaCha20 with a 96-bit nonce and a 32-bit counter (IETF) */
#define crypto_stream_chacha20_ietf_KEYBYTES 32U
SODIUM_EXPORT
size_t crypto_stream_chacha20_ietf_keybytes(void);
#define crypto_stream_chacha20_ietf_NONCEBYTES 12U
SODIUM_EXPORT
size_t crypto_stream_chacha20_ietf_noncebytes(void);
#define crypto_stream_chacha20_ietf_MESSAGEBYTES_MAX \
SODIUM_MIN(SODIUM_SIZE_MAX, 64ULL * (1ULL << 32))
SODIUM_EXPORT
size_t crypto_stream_chacha20_ietf_messagebytes_max(void);
SODIUM_EXPORT
int crypto_stream_chacha20_ietf(unsigned char *c, unsigned long long clen,
const unsigned char *n, const unsigned char *k);
SODIUM_EXPORT
int crypto_stream_chacha20_ietf_xor(unsigned char *c, const unsigned char *m,
unsigned long long mlen, const unsigned char *n,
const unsigned char *k);
SODIUM_EXPORT
int crypto_stream_chacha20_ietf_xor_ic(unsigned char *c, const unsigned char *m,
unsigned long long mlen,
const unsigned char *n, uint32_t ic,
const unsigned char *k);
SODIUM_EXPORT
void crypto_stream_chacha20_ietf_keygen(unsigned char k[crypto_stream_chacha20_ietf_KEYBYTES]);
/* Aliases */
#define crypto_stream_chacha20_IETF_KEYBYTES crypto_stream_chacha20_ietf_KEYBYTES
#define crypto_stream_chacha20_IETF_NONCEBYTES crypto_stream_chacha20_ietf_NONCEBYTES
#define crypto_stream_chacha20_IETF_MESSAGEBYTES_MAX crypto_stream_chacha20_ietf_MESSAGEBYTES_MAX
#ifdef __cplusplus
}
#endif
#endif
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