/*

 * ASN.1 DER parsing

 * Copyright (c) 2006, Jouni Malinen <j@w1.fi>

 *

 * This software may be distributed under the terms of the BSD license.

 * See README for more details.

 */

#ifndef ASN1_H

#define ASN1_H

#define ASN1_TAG_EOC    0x00 /* not used with DER */

#define ASN1_TAG_BOOLEAN  0x01

#define ASN1_TAG_INTEGER  0x02

#define ASN1_TAG_BITSTRING  0x03

#define ASN1_TAG_OCTETSTRING  0x04

#define ASN1_TAG_NULL   0x05

#define ASN1_TAG_OID    0x06

#define ASN1_TAG_OBJECT_DESCRIPTOR  0x07 /* not yet parsed */

#define ASN1_TAG_EXTERNAL 0x08 /* not yet parsed */

#define ASN1_TAG_REAL   0x09 /* not yet parsed */

#define ASN1_TAG_ENUMERATED 0x0A /* not yet parsed */

#define ASN1_TAG_EMBEDDED_PDV 0x0B /* not yet parsed */

#define ASN1_TAG_UTF8STRING 0x0C /* not yet parsed */

#define ANS1_TAG_RELATIVE_OID 0x0D

#define ASN1_TAG_TIME   0x0E

#define ASN1_TAG_SEQUENCE 0x10 /* shall be constructed */

#define ASN1_TAG_SET    0x11

#define ASN1_TAG_NUMERICSTRING  0x12 /* not yet parsed */

#define ASN1_TAG_PRINTABLESTRING  0x13

#define ASN1_TAG_T61STRING  0x14 /* not yet parsed */

#define ASN1_TAG_VIDEOTEXSTRING 0x15 /* not yet parsed */

#define ASN1_TAG_IA5STRING  0x16

#define ASN1_TAG_UTCTIME  0x17

#define ASN1_TAG_GENERALIZEDTIME  0x18 /* not yet parsed */

#define ASN1_TAG_GRAPHICSTRING  0x19 /* not yet parsed */

#define ASN1_TAG_VISIBLESTRING  0x1A

#define ASN1_TAG_GENERALSTRING  0x1B /* not yet parsed */

#define ASN1_TAG_UNIVERSALSTRING  0x1C /* not yet parsed */

#define ASN1_TAG_CHARACTERSTRING  0x1D /* not yet parsed */

#define ASN1_TAG_BMPSTRING  0x1E /* not yet parsed */

#define ASN1_CLASS_UNIVERSAL    0

#define ASN1_CLASS_APPLICATION    1

#define ASN1_CLASS_CONTEXT_SPECIFIC 2

#define ASN1_CLASS_PRIVATE    3

struct asn1_hdr {

  const u8 *payload;

  u8 identifier, class, constructed;

  unsigned int tag, length;

};

#define ASN1_MAX_OID_LEN 20

struct asn1_oid {

  unsigned long oid[ASN1_MAX_OID_LEN];

  size_t len;

};

int asn1_get_next(const u8 *buf, size_t len, struct asn1_hdr *hdr);

void asn1_print_hdr(const struct asn1_hdr *hdr, const char *title);

void asn1_unexpected(const struct asn1_hdr *hdr, const char *title);

int asn1_parse_oid(const u8 *buf, size_t len, struct asn1_oid *oid);

int asn1_get_oid(const u8 *buf, size_t len, struct asn1_oid *oid,

     const u8 **next);

void asn1_oid_to_str(const struct asn1_oid *oid, char *buf, size_t len);

unsigned long asn1_bit_string_to_long(const u8 *buf, size_t len);

int asn1_oid_equal(const struct asn1_oid *a, const struct asn1_oid *b);

int asn1_get_integer(const u8 *buf, size_t len, int *integer, const u8 **next);

int asn1_get_sequence(const u8 *buf, size_t len, struct asn1_hdr *hdr,

          const u8 **next);

int asn1_get_alg_id(const u8 *buf, size_t len, struct asn1_oid *oid,

        const u8 **params, size_t *params_len, const u8 **next);

void asn1_put_integer(struct wpabuf *buf, int val);

void asn1_put_octet_string(struct wpabuf *buf, const struct wpabuf *val);

void asn1_put_oid(struct wpabuf *buf, const struct asn1_oid *oid);

void asn1_put_hdr(struct wpabuf *buf, u8 class, int constructed, u8 tag,

      size_t len);

void asn1_put_sequence(struct wpabuf *buf, const struct wpabuf *payload);

void asn1_put_set(struct wpabuf *buf, const struct wpabuf *payload);

void asn1_put_utf8string(struct wpabuf *buf, const char *val);

struct wpabuf * asn1_build_alg_id(const struct asn1_oid *oid,

          const struct wpabuf *params);

struct wpabuf * asn1_encaps(struct wpabuf *buf, u8 class, u8 tag);

static inline bool asn1_is_oid(const struct asn1_hdr *hdr)

{

  return hdr->class == ASN1_CLASS_UNIVERSAL &&

    hdr->tag == ASN1_TAG_OID;

}

static inline bool asn1_is_boolean(const struct asn1_hdr *hdr)

{

  return hdr->class == ASN1_CLASS_UNIVERSAL &&

    hdr->tag == ASN1_TAG_BOOLEAN;

}

static inline bool asn1_is_integer(const struct asn1_hdr *hdr)

{

  return hdr->class == ASN1_CLASS_UNIVERSAL &&

    hdr->tag == ASN1_TAG_INTEGER;

}

static inline bool asn1_is_enumerated(const struct asn1_hdr *hdr)

{

  return hdr->class == ASN1_CLASS_UNIVERSAL &&

    hdr->tag == ASN1_TAG_ENUMERATED;

}

static inline bool asn1_is_sequence(const struct asn1_hdr *hdr)

{

  return hdr->class == ASN1_CLASS_UNIVERSAL &&

    hdr->tag == ASN1_TAG_SEQUENCE;

}

static inline bool asn1_is_set(const struct asn1_hdr *hdr)

{

  return hdr->class == ASN1_CLASS_UNIVERSAL &&

    hdr->tag == ASN1_TAG_SET;

}

static inline bool asn1_is_octetstring(const struct asn1_hdr *hdr)

{

  return hdr->class == ASN1_CLASS_UNIVERSAL &&

    hdr->tag == ASN1_TAG_OCTETSTRING;

}

static inline bool asn1_is_bitstring(const struct asn1_hdr *hdr)

{

  return hdr->class == ASN1_CLASS_UNIVERSAL &&

    hdr->tag == ASN1_TAG_BITSTRING;

}

static inline bool asn1_is_utctime(const struct asn1_hdr *hdr)

{

  return hdr->class == ASN1_CLASS_UNIVERSAL &&

    hdr->tag == ASN1_TAG_UTCTIME;

}

static inline bool asn1_is_generalizedtime(const struct asn1_hdr *hdr)

{

  return hdr->class == ASN1_CLASS_UNIVERSAL &&

    hdr->tag == ASN1_TAG_GENERALIZEDTIME;

}

static inline bool asn1_is_string_type(const struct asn1_hdr *hdr)

{

  if (hdr->class != ASN1_CLASS_UNIVERSAL || hdr->constructed)

    return false;

  return hdr->tag == ASN1_TAG_UTF8STRING ||

    hdr->tag == ASN1_TAG_NUMERICSTRING ||

    hdr->tag == ASN1_TAG_PRINTABLESTRING ||

    hdr->tag == ASN1_TAG_T61STRING ||

    hdr->tag == ASN1_TAG_VIDEOTEXSTRING ||

    hdr->tag == ASN1_TAG_IA5STRING ||

    hdr->tag == ASN1_TAG_GRAPHICSTRING ||

    hdr->tag == ASN1_TAG_VISIBLESTRING ||

    hdr->tag == ASN1_TAG_GENERALSTRING ||

    hdr->tag == ASN1_TAG_UNIVERSALSTRING ||

    hdr->tag == ASN1_TAG_CHARACTERSTRING ||

    hdr->tag == ASN1_TAG_BMPSTRING;

}

static inline bool asn1_is_bmpstring(const struct asn1_hdr *hdr)

{

  return hdr->class == ASN1_CLASS_UNIVERSAL &&

    hdr->tag == ASN1_TAG_BMPSTRING;

}

static inline bool asn1_is_utf8string(const struct asn1_hdr *hdr)

{

  return hdr->class == ASN1_CLASS_UNIVERSAL &&

    hdr->tag == ASN1_TAG_UTF8STRING;

}

static inline bool asn1_is_null(const struct asn1_hdr *hdr)

{

  return hdr->class == ASN1_CLASS_UNIVERSAL &&

    hdr->tag == ASN1_TAG_NULL;

}

static inline bool asn1_is_cs_tag(const struct asn1_hdr *hdr, unsigned int tag)

{

  return hdr->class == ASN1_CLASS_CONTEXT_SPECIFIC &&

    hdr->tag == tag;

}

extern const struct asn1_oid asn1_sha1_oid;

extern const struct asn1_oid asn1_sha256_oid;

extern const struct asn1_oid asn1_ec_public_key_oid;

extern const struct asn1_oid asn1_prime256v1_oid;

extern const struct asn1_oid asn1_secp384r1_oid;

extern const struct asn1_oid asn1_secp521r1_oid;

extern const struct asn1_oid asn1_brainpoolP256r1_oid;

extern const struct asn1_oid asn1_brainpoolP384r1_oid;

extern const struct asn1_oid asn1_brainpoolP512r1_oid;

extern const struct asn1_oid asn1_aes_siv_cmac_aead_256_oid;

extern const struct asn1_oid asn1_aes_siv_cmac_aead_384_oid;

extern const struct asn1_oid asn1_aes_siv_cmac_aead_512_oid;

extern const struct asn1_oid asn1_aes_siv_cmac_aead_256_oid;

extern const struct asn1_oid asn1_aes_siv_cmac_aead_384_oid;

extern const struct asn1_oid asn1_aes_siv_cmac_aead_512_oid;

extern const struct asn1_oid asn1_pbkdf2_oid;

extern const struct asn1_oid asn1_pbkdf2_hmac_sha256_oid;

extern const struct asn1_oid asn1_pbkdf2_hmac_sha384_oid;

extern const struct asn1_oid asn1_pbkdf2_hmac_sha512_oid;

extern const struct asn1_oid asn1_dpp_config_params_oid;

extern const struct asn1_oid asn1_dpp_asymmetric_key_package_oid;

#endif /* ASN1_H */