/usr/include/sodium/crypto_stream_chacha20.h is in libsodium-dev 1.0.8-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 | #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
# if __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);
/* 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);
/* ChaCha20 with a 96-bit nonce and a 32-bit counter (IETF) */
#define crypto_stream_chacha20_IETF_NONCEBYTES 12U
SODIUM_EXPORT
size_t crypto_stream_chacha20_ietf_noncebytes(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);
/* ------------------------------------------------------------------------- */
int _crypto_stream_chacha20_pick_best_implementation(void);
#ifdef __cplusplus
}
#endif
#endif
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