openpgp.h

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#pragma once

 
#include <ascii-chat/crypto/sizes.h>
#include "../../common.h"
#include <stdint.h>
#include <stddef.h>
#include <stdbool.h>


#define OPENPGP_TAG_PUBLIC_KEY 6

#define OPENPGP_TAG_SECRET_KEY 5

#define OPENPGP_TAG_USER_ID 13

#define OPENPGP_TAG_SIGNATURE 2

#define OPENPGP_ALGO_EDDSA 22

#define OPENPGP_ALGO_ECDH 18



typedef struct {
  uint8_t tag;       
  size_t length;     
  size_t header_len; 
  bool new_format;   
} openpgp_packet_header_t;



typedef struct {
  uint8_t version;                         
  uint32_t created;                        
  uint8_t algorithm;                       
  uint8_t pubkey[ED25519_PUBLIC_KEY_SIZE]; 
  uint64_t keyid;                          
} openpgp_public_key_t;



typedef struct {
  uint8_t version;                         
  uint32_t created;                        
  uint8_t algorithm;                       
  uint8_t pubkey[ED25519_PUBLIC_KEY_SIZE]; 
  uint8_t seckey[ED25519_SEED_SIZE];       
  uint64_t keyid;                          
  bool is_encrypted;                       
} openpgp_secret_key_t;



asciichat_error_t openpgp_parse_armored_pubkey(const char *armored_text, uint8_t ed25519_pk[ED25519_PUBLIC_KEY_SIZE]);

asciichat_error_t openpgp_parse_binary_pubkey(const uint8_t *data, size_t data_len,
                                              uint8_t ed25519_pk[ED25519_PUBLIC_KEY_SIZE]);

asciichat_error_t openpgp_parse_armored_seckey(const char *armored_text, uint8_t ed25519_pk[ED25519_PUBLIC_KEY_SIZE],
                                               uint8_t ed25519_sk[ED25519_SEED_SIZE]);

asciichat_error_t openpgp_parse_binary_seckey(const uint8_t *data, size_t data_len,
                                              uint8_t ed25519_pk[ED25519_PUBLIC_KEY_SIZE],
                                              uint8_t ed25519_sk[ED25519_SEED_SIZE]);



asciichat_error_t openpgp_parse_packet_header(const uint8_t *data, size_t data_len, openpgp_packet_header_t *header);

asciichat_error_t openpgp_parse_public_key_packet(const uint8_t *packet_body, size_t body_len,
                                                  openpgp_public_key_t *pubkey);

asciichat_error_t openpgp_parse_secret_key_packet(const uint8_t *packet_body, size_t body_len,
                                                  openpgp_secret_key_t *seckey);

asciichat_error_t openpgp_extract_ed25519_from_mpi(const uint8_t *mpi, size_t mpi_len,
                                                   uint8_t ed25519_pk[ED25519_PUBLIC_KEY_SIZE]);



asciichat_error_t openpgp_base64_decode(const char *base64, size_t base64_len, uint8_t **binary_out,
                                        size_t *binary_len);