ecdh.h

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#ifndef OPENPGP_ECDH_H
#define OPENPGP_ECDH_H
 
#include <stdint.h>
#include <stdbool.h>
#include <stddef.h>
 
#ifdef __cplusplus
extern "C" {
#endif

bool ecdh_p256_compute_shared_secret(
    uint8_t* privkey,           // 32 bytes, WILL BE CLEARED
    const uint8_t* peer_pubkey, // 65 bytes (04||X||Y)
    uint8_t* shared_out         // 32 bytes
);

bool ecdh_p256_generate_keypair(
    uint8_t* privkey_out,  // 32 bytes
    uint8_t* pubkey_out    // 65 bytes
);

bool ecdh_p256_derive_pubkey(
    const uint8_t* privkey,  // 32 bytes
    uint8_t* pubkey_out      // 65 bytes
);

void ecdh_secure_clear(void* ptr, size_t size);
 
#ifdef __cplusplus
}
#endif
 
#endif // OPENPGP_ECDH_H