#ifndef sodium_utils_H
#define sodium_utils_H
#include <stddef.h>
#include "export.h"
#ifdef __cplusplus
extern "C" {
#endif
#ifndef SODIUM_C99
# if defined(__cplusplus) || !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901L
# define SODIUM_C99(X)
# else
# define SODIUM_C99(X) X
# endif
#endif
SODIUM_EXPORT
void sodium_memzero(void * const pnt, const size_t len);
SODIUM_EXPORT
void sodium_stackzero(const size_t len);
/*
* WARNING: sodium_memcmp() must be used to verify if two secret keys
* are equal, in constant time.
* It returns 0 if the keys are equal, and -1 if they differ.
* This function is not designed for lexicographical comparisons.
*/
SODIUM_EXPORT
int sodium_memcmp(const void * const b1_, const void * const b2_, size_t len)
__attribute__ ((warn_unused_result));
/*
* sodium_compare() returns -1 if b1_ < b2_, 1 if b1_ > b2_ and 0 if b1_ == b2_
* It is suitable for lexicographical comparisons, or to compare nonces
* and counters stored in little-endian format.
* However, it is slower than sodium_memcmp().
*/
SODIUM_EXPORT
int sodium_compare(const unsigned char *b1_, const unsigned char *b2_,
size_t len)
__attribute__ ((warn_unused_result));
SODIUM_EXPORT
int sodium_is_zero(const unsigned char *n, const size_t nlen);
SODIUM_EXPORT
void sodium_increment(unsigned char *n, const size_t nlen);
SODIUM_EXPORT
void sodium_add(unsigned char *a, const unsigned char *b, const size_t len);
SODIUM_EXPORT
char *sodium_bin2hex(char * const hex, const size_t hex_maxlen,
const unsigned char * const bin, const size_t bin_len);
SODIUM_EXPORT
int sodium_hex2bin(unsigned char * const bin, const size_t bin_maxlen,
const char * const hex, const size_t hex_len,
const char * const ignore, size_t * const bin_len,
const char ** const hex_end);
#define sodium_base64_VARIANT_ORIGINAL 1
#define sodium_base64_VARIANT_ORIGINAL_NO_PADDING 3
#define sodium_base64_VARIANT_URLSAFE 5
#define sodium_base64_VARIANT_URLSAFE_NO_PADDING 7
/*
* Computes the required length to encode BIN_LEN bytes as a base64 string
* using the given variant. The computed length includes a trailing \0.
*/
#define sodium_base64_ENCODED_LEN(BIN_LEN, VARIANT) \
(((BIN_LEN) / 3U) * 4U + \
((((BIN_LEN) - ((BIN_LEN) / 3U) * 3U) | (((BIN_LEN) - ((BIN_LEN) / 3U) * 3U) >> 1)) & 1U) * \
(4U - (~((((VARIANT) & 2U) >> 1) - 1U) & (3U - ((BIN_LEN) - ((BIN_LEN) / 3U) * 3U)))) + 1U)
SODIUM_EXPORT
size_t sodium_base64_encoded_len(const size_t bin_len, const int variant);
SODIUM_EXPORT
char *sodium_bin2base64(char * const b64, const size_t b64_maxlen,
const unsigned char * const bin, const size_t bin_len,
const int variant);
SODIUM_EXPORT
int sodium_base642bin(unsigned char * const bin, const size_t bin_maxlen,
const char * const b64, const size_t b64_len,
const char * const ignore, size_t * const bin_len,
const char ** const b64_end, const int variant);
SODIUM_EXPORT
int sodium_mlock(void * const addr, const size_t len);
SODIUM_EXPORT
int sodium_munlock(void * const addr, const size_t len);
/* WARNING: sodium_malloc() and sodium_allocarray() are not general-purpose
* allocation functions.
*
* They return a pointer to a region filled with 0xd0 bytes, immediately
* followed by a guard page.
* As a result, accessing a single byte after the requested allocation size
* will intentionally trigger a segmentation fault.
*
* A canary and an additional guard page placed before the beginning of the
* region may also kill the process if a buffer underflow is detected.
*
* The memory layout is:
* [unprotected region size (read only)][guard page (no access)][unprotected pages (read/write)][guard page (no access)]
* With the layout of the unprotected pages being:
* [optional padding][16-bytes canary][user region]
*
* However:
* - These functions are significantly slower than standard functions
* - Each allocation requires 3 or 4 additional pages
* - The returned address will not be aligned if the allocation size is not
* a multiple of the required alignment. For this reason, these functions
* are designed to store data, such as secret keys and messages.
*
* sodium_malloc() can be used to allocate any libsodium data structure.
*
* The crypto_generichash_state structure is packed and its length is
* either 357 or 361 bytes. For this reason, when using sodium_malloc() to
* allocate a crypto_generichash_state structure, padding must be added in
* order to ensure proper alignment. crypto_generichash_statebytes()
* returns the rounded up structure size, and should be prefered to sizeof():
* state = sodium_malloc(crypto_generichash_statebytes());
*/
SODIUM_EXPORT
void *sodium_malloc(const size_t size)
__attribute__ ((malloc));
SODIUM_EXPORT
void *sodium_allocarray(size_t count, size_t size)
__attribute__ ((malloc));
SODIUM_EXPORT
void sodium_free(void *ptr);
SODIUM_EXPORT
int sodium_mprotect_noaccess(void *ptr);
SODIUM_EXPORT
int sodium_mprotect_readonly(void *ptr);
SODIUM_EXPORT
int sodium_mprotect_readwrite(void *ptr);
SODIUM_EXPORT
int sodium_pad(size_t *padded_buflen_p, unsigned char *buf,
size_t unpadded_buflen, size_t blocksize, size_t max_buflen);
SODIUM_EXPORT
int sodium_unpad(size_t *unpadded_buflen_p, const unsigned char *buf,
size_t padded_buflen, size_t blocksize);
/* -------- */
int _sodium_alloc_init(void);
#ifdef __cplusplus
}
#endif
#endif
