/*
 *
 */


#ifndef _NGX_EVENT_QUIC_H_INCLUDED_
#define _NGX_EVENT_QUIC_H_INCLUDED_


#include <ngx_event_openssl.h>

#define quic_version 0xff000018


typedef struct {
    ngx_str_t          secret;
    ngx_str_t          key;
    ngx_str_t          iv;
    ngx_str_t          hp;
} ngx_quic_secret_t;


struct ngx_quic_connection_s {
    ngx_str_t          scid;
    ngx_str_t          dcid;
    ngx_str_t          token;

    ngx_quic_secret_t  client_in;
    ngx_quic_secret_t  client_hs;
    ngx_quic_secret_t  client_ad;
    ngx_quic_secret_t  server_in;
    ngx_quic_secret_t  server_hs;
    ngx_quic_secret_t  server_ad;
};


uint64_t ngx_quic_parse_pn(u_char **pos, ngx_int_t len, u_char *mask);
uint64_t ngx_quic_parse_int(u_char **pos);
void ngx_quic_build_int(u_char **pos, uint64_t value);

ngx_int_t ngx_hkdf_extract(u_char *out_key, size_t *out_len,
    const EVP_MD *digest, const u_char *secret, size_t secret_len,
    const u_char *salt, size_t salt_len);
ngx_int_t ngx_hkdf_expand(u_char *out_key, size_t out_len,
    const EVP_MD *digest, const u_char *prk, size_t prk_len,
    const u_char *info, size_t info_len);

ngx_int_t ngx_quic_hkdf_expand(ngx_connection_t *c, const EVP_MD *digest,
    ngx_str_t *out, ngx_str_t *label, const uint8_t *prk, size_t prk_len);

ngx_int_t ngx_quic_tls_open(ngx_connection_t *c,
    const EVP_CIPHER *cipher, ngx_quic_secret_t *s, ngx_str_t *out,
    u_char *nonce, ngx_str_t *in, ngx_str_t *ad);
ngx_int_t ngx_quic_tls_seal(ngx_connection_t *c,
    const EVP_CIPHER *cipher, ngx_quic_secret_t *s, ngx_str_t *out,
    u_char *nonce, ngx_str_t *in, ngx_str_t *ad);

ngx_int_t
ngx_quic_tls_hp(ngx_connection_t *c, const EVP_CIPHER *cipher,
    ngx_quic_secret_t *s, u_char *out, u_char *in);


#if (NGX_HAVE_NONALIGNED)

#define ngx_quic_parse_uint16(p)  ntohs(*(uint16_t *) (p))
#define ngx_quic_parse_uint32(p)  ntohl(*(uint32_t *) (p))

#else

#define ngx_quic_parse_uint16(p)  ((p)[0] << 8 | (p)[1])
#define ngx_quic_parse_uint32(p)                                              \
    ((uint32_t) (p)[0] << 24 | (p)[1] << 16 | (p)[2] << 8 | (p)[3])

#endif


#define ngx_quic_write_uint16_aligned(p, s)                                   \
    (*(uint16_t *) (p) = htons((uint16_t) (s)), (p) + sizeof(uint16_t))
#define ngx_quic_write_uint32_aligned(p, s)                                   \
    (*(uint32_t *) (p) = htonl((uint32_t) (s)), (p) + sizeof(uint32_t))

#if (NGX_HAVE_NONALIGNED)

#define ngx_quic_write_uint16  ngx_quic_write_uint16_aligned
#define ngx_quic_write_uint32  ngx_quic_write_uint32_aligned

#else

#define ngx_quic_write_uint16(p, s)                                           \
    ((p)[0] = (u_char) ((s) >> 8),                                            \
     (p)[1] = (u_char)  (s),                                                  \
     (p) + sizeof(uint16_t))

#define ngx_quic_write_uint32(p, s)                                           \
    ((p)[0] = (u_char) ((s) >> 24),                                           \
     (p)[1] = (u_char) ((s) >> 16),                                           \
     (p)[2] = (u_char) ((s) >> 8),                                            \
     (p)[3] = (u_char)  (s),                                                  \
     (p) + sizeof(uint32_t))

#endif

#endif /* _NGX_EVENT_QUIC_H_INCLUDED_ */