#ifndef crypto_stream_salsa20_H

#define crypto_stream_salsa20_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_salsa20_KEYBYTES 32U

SODIUM_EXPORT

size_t crypto_stream_salsa20_keybytes(void);

#define crypto_stream_salsa20_NONCEBYTES 8U

SODIUM_EXPORT

size_t crypto_stream_salsa20_noncebytes(void);

#define crypto_stream_salsa20_MESSAGEBYTES_MAX SODIUM_SIZE_MAX

SODIUM_EXPORT

size_t crypto_stream_salsa20_messagebytes_max(void);

SODIUM_EXPORT

int crypto_stream_salsa20(unsigned char *c, unsigned long long clen,

                          const unsigned char *n, const unsigned char *k)

            __attribute__ ((nonnull));

SODIUM_EXPORT

int crypto_stream_salsa20_xor(unsigned char *c, const unsigned char *m,

                              unsigned long long mlen, const unsigned char *n,

                              const unsigned char *k)

            __attribute__ ((nonnull));

SODIUM_EXPORT

int crypto_stream_salsa20_xor_ic(unsigned char *c, const unsigned char *m,

                                 unsigned long long mlen,

                                 const unsigned char *n, uint64_t ic,

                                 const unsigned char *k)

            __attribute__ ((nonnull));

SODIUM_EXPORT

void crypto_stream_salsa20_keygen(unsigned char k[crypto_stream_salsa20_KEYBYTES])

            __attribute__ ((nonnull));

#ifdef __cplusplus

}

#endif

#endif