File syn_x25519.h¶

File List > crypto > syn_x25519.h
#ifndef SYN_X25519_H
#define SYN_X25519_H

#if __has_include("syn_config.h")
#include "syn_config.h"
#endif

#if !defined(SYN_USE_X25519) || SYN_USE_X25519

#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif

void syn_x25519(uint8_t shared_out[32], const uint8_t scalar[32], const uint8_t point[32]);

void syn_x25519_pubkey(uint8_t public_out[32], const uint8_t private_key[32]);

static inline void syn_x25519_clamp(uint8_t key[32])
{
    key[0] &= 248;  /* Clear low 3 bits (multiple of 8) */
    key[31] &= 127; /* Clear high bit */
    key[31] |= 64;  /* Set second-highest bit */
}

#ifdef __cplusplus
}
#endif

#endif /* SYN_USE_X25519 */

#endif /* SYN_X25519_H */