constants.h

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#pragma once
#include <stddef.h>
#include <stdint.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
/* === RFC 4880 Public-Key Algorithm Identifiers === */

#define OPENPGP_ALGO_ECDSA 19

#define OPENPGP_ALGO_EDDSA 22
 
/* === Fingerprint and digest sizes === */

#define OPENPGP_FINGERPRINT_SIZE 20

#define SHA256_DIGEST_SIZE 32
 
/* === P-256 (secp256r1) sizes === */

#define P256_PUBKEY_SIZE 65

#define P256_PRIVKEY_SIZE 32

#define P256_ECDH_SECRET_SIZE 32

#define P256_PUBKEY_BITS 520
 
/* === Ed25519 sizes === */

#define ED25519_PUBKEY_SIZE 32
 
/* === OpenPGP MPI sizes (RFC 4880 Section 3.2: 2-byte length prefix + payload) === */

#define MPI_HEADER_SIZE 2

#define MPI_FULL_SIZE_ED25519 (MPI_HEADER_SIZE + ED25519_PUBKEY_SIZE)

#define MPI_FULL_SIZE_P256 (MPI_HEADER_SIZE + P256_PUBKEY_SIZE)
 
/* === OpenPGP Smart Card password reference codes (Spec 3.4.1, Section 7.2.2) === */

#define PW1_CODE_1 0x81

#define PW1_CODE_2 0x82

#define PW3_CODE 0x83
 
#ifdef __cplusplus
}
#endif