text: /**
   * \file x509.h
   *
   * \brief X.509 generic defines and structures
   */
  /*
   *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
   *  SPDX-License-Identifier: GPL-2.0
   *
   *  This program is free software; you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation; either version 2 of the License, or
   *  (at your option) any later version.
   *
   *  This program is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License along
   *  with this program; if not, write to the Free Software Foundation, Inc.,
   *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   *  This file is part of mbed TLS (https://tls.mbed.org)
   */
  #ifndef MBEDTLS_X509_H
  #define MBEDTLS_X509_H
  
  #if !defined(MBEDTLS_CONFIG_FILE)
  #include "config.h"
  #else
  #include MBEDTLS_CONFIG_FILE
  #endif
  
  #include "asn1.h"
  #include "pk.h"
  
  #if defined(MBEDTLS_RSA_C)
  #include "rsa.h"
  #endif
  
  /**
   * \addtogroup x509_module
   * \{
   */
  
  #if !defined(MBEDTLS_X509_MAX_INTERMEDIATE_CA)
  /**
   * Maximum number of intermediate CAs in a verification chain.
   * That is, maximum length of the chain, excluding the end-entity certificate
   * and the trusted root certificate.
   *
   * Set this to a low value to prevent an adversary from making you waste
   * resources verifying an overlong certificate chain.
   */
  #define MBEDTLS_X509_MAX_INTERMEDIATE_CA   8
  #endif
  
  /**
   * \name X509 Error codes
   * \{
   */
  #define MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE              -0x2080  /**< Unavailable feature, e.g. RSA hashing/encryption combination. */
  #define MBEDTLS_ERR_X509_UNKNOWN_OID                      -0x2100  /**< Requested OID is unknown. */
  #define MBEDTLS_ERR_X509_INVALID_FORMAT                   -0x2180  /**< The CRT/CRL/CSR format is invalid, e.g. different type expected. */
  #define MBEDTLS_ERR_X509_INVALID_VERSION                  -0x2200  /**< The CRT/CRL/CSR version element is invalid. */
  #define MBEDTLS_ERR_X509_INVALID_SERIAL                   -0x2280  /**< The serial tag or value is invalid. */
  #define MBEDTLS_ERR_X509_INVALID_ALG                      -0x2300  /**< The algorithm tag or value is invalid. */
  #define MBEDTLS_ERR_X509_INVALID_NAME                     -0x2380  /**< The name tag or value is invalid. */
  #define MBEDTLS_ERR_X509_INVALID_DATE                     -0x2400  /**< The date tag or value is invalid. */
  #define MBEDTLS_ERR_X509_INVALID_SIGNATURE                -0x2480  /**< The signature tag or value invalid. */
  #define MBEDTLS_ERR_X509_INVALID_EXTENSIONS               -0x2500  /**< The extension tag or value is invalid. */
  #define MBEDTLS_ERR_X509_UNKNOWN_VERSION                  -0x2580  /**< CRT/CRL/CSR has an unsupported version number. */
  #define MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG                  -0x2600  /**< Signature algorithm (oid) is unsupported. */
  #define MBEDTLS_ERR_X509_SIG_MISMATCH                     -0x2680  /**< Signature algorithms do not match. (see \c ::mbedtls_x509_crt sig_oid) */
  #define MBEDTLS_ERR_X509_CERT_VERIFY_FAILED               -0x2700  /**< Certificate verification failed, e.g. CRL, CA or signature check failed. */
  #define MBEDTLS_ERR_X509_CERT_UNKNOWN_FORMAT              -0x2780  /**< Format not recognized as DER or PEM. */
  #define MBEDTLS_ERR_X509_BAD_INPUT_DATA                   -0x2800  /**< Input invalid. */
  #define MBEDTLS_ERR_X509_ALLOC_FAILED                     -0x2880  /**< Allocation of memory failed. */
  #define MBEDTLS_ERR_X509_FILE_IO_ERROR                    -0x2900  /**< Read/write of file failed. */
  #define MBEDTLS_ERR_X509_BUFFER_TOO_SMALL                 -0x2980  /**< Destination buffer is too small. */
  #define MBEDTLS_ERR_X509_FATAL_ERROR                      -0x3000  /**< A fatal error occured, eg the chain is too long or the vrfy callback failed. */
  /* \} name */
  
  /**
   * \name X509 Verify codes
   * \{
   */
  /* Reminder: update x509_crt_verify_strings[] in library/x509_crt.c */
  #define MBEDTLS_X509_BADCERT_EXPIRED             0x01  /**< The certificate validity has expired. */
  #define MBEDTLS_X509_BADCERT_REVOKED             0x02  /**< The certificate has been revoked (is on a CRL). */
  #define MBEDTLS_X509_BADCERT_CN_MISMATCH         0x04  /**< The certificate Common Name (CN) does not match with the expected CN. */
  #define MBEDTLS_X509_BADCERT_NOT_TRUSTED         0x08  /**< The certificate is not correctly signed by the trusted CA. */
  #define MBEDTLS_X509_BADCRL_NOT_TRUSTED          0x10  /**< The CRL is not correctly signed by the trusted CA. */
  #define MBEDTLS_X509_BADCRL_EXPIRED              0x20  /**< The CRL is expired. */
  #define MBEDTLS_X509_BADCERT_MISSING             0x40  /**< Certificate was missing. */
  #define MBEDTLS_X509_BADCERT_SKIP_VERIFY         0x80  /**< Certificate verification was skipped. */
  #define MBEDTLS_X509_BADCERT_OTHER             0x0100  /**< Other reason (can be used by verify callback) */
  #define MBEDTLS_X509_BADCERT_FUTURE            0x0200  /**< The certificate validity starts in the future. */
  #define MBEDTLS_X509_BADCRL_FUTURE             0x0400  /**< The CRL is from the future */
  #define MBEDTLS_X509_BADCERT_KEY_USAGE         0x0800  /**< Usage does not match the keyUsage extension. */
  #define MBEDTLS_X509_BADCERT_EXT_KEY_USAGE     0x1000  /**< Usage does not match the extendedKeyUsage extension. */
  #define MBEDTLS_X509_BADCERT_NS_CERT_TYPE      0x2000  /**< Usage does not match the nsCertType extension. */
  #define MBEDTLS_X509_BADCERT_BAD_MD            0x4000  /**< The certificate is signed with an unacceptable hash. */
  #define MBEDTLS_X509_BADCERT_BAD_PK            0x8000  /**< The certificate is signed with an unacceptable PK alg (eg RSA vs ECDSA). */
  #define MBEDTLS_X509_BADCERT_BAD_KEY         0x010000  /**< The certificate is signed with an unacceptable key (eg bad curve, RSA too short). */
  #define MBEDTLS_X509_BADCRL_BAD_MD           0x020000  /**< The CRL is signed with an unacceptable hash. */
  #define MBEDTLS_X509_BADCRL_BAD_PK           0x040000  /**< The CRL is signed with an unacceptable PK alg (eg RSA vs ECDSA). */
  #define MBEDTLS_X509_BADCRL_BAD_KEY          0x080000  /**< The CRL is signed with an unacceptable key (eg bad curve, RSA too short). */
  
  /* \} name */
  /* \} addtogroup x509_module */
  
  /*
   * X.509 v3 Key Usage Extension flags
   * Reminder: update x509_info_key_usage() when adding new flags.
   */
  #define MBEDTLS_X509_KU_DIGITAL_SIGNATURE            (0x80)  /* bit 0 */
  #define MBEDTLS_X509_KU_NON_REPUDIATION              (0x40)  /* bit 1 */
  #define MBEDTLS_X509_KU_KEY_ENCIPHERMENT             (0x20)  /* bit 2 */
  #define MBEDTLS_X509_KU_DATA_ENCIPHERMENT            (0x10)  /* bit 3 */
  #define MBEDTLS_X509_KU_KEY_AGREEMENT                (0x08)  /* bit 4 */
  #define MBEDTLS_X509_KU_KEY_CERT_SIGN                (0x04)  /* bit 5 */
  #define MBEDTLS_X509_KU_CRL_SIGN                     (0x02)  /* bit 6 */
  #define MBEDTLS_X509_KU_ENCIPHER_ONLY                (0x01)  /* bit 7 */
  #define MBEDTLS_X509_KU_DECIPHER_ONLY              (0x8000)  /* bit 8 */
  
  /*
   * Netscape certificate types
   * (http://www.mozilla.org/projects/security/pki/nss/tech-notes/tn3.html)
   */
  
  #define MBEDTLS_X509_NS_CERT_TYPE_SSL_CLIENT         (0x80)  /* bit 0 */
  #define MBEDTLS_X509_NS_CERT_TYPE_SSL_SERVER         (0x40)  /* bit 1 */
  #define MBEDTLS_X509_NS_CERT_TYPE_EMAIL              (0x20)  /* bit 2 */
  #define MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING     (0x10)  /* bit 3 */
  #define MBEDTLS_X509_NS_CERT_TYPE_RESERVED           (0x08)  /* bit 4 */
  #define MBEDTLS_X509_NS_CERT_TYPE_SSL_CA             (0x04)  /* bit 5 */
  #define MBEDTLS_X509_NS_CERT_TYPE_EMAIL_CA           (0x02)  /* bit 6 */
  #define MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING_CA  (0x01)  /* bit 7 */
  
  /*
   * X.509 extension types
   *
   * Comments refer to the status for using certificates. Status can be
   * different for writing certificates or reading CRLs or CSRs.
   */
  #define MBEDTLS_X509_EXT_AUTHORITY_KEY_IDENTIFIER    (1 << 0)
  #define MBEDTLS_X509_EXT_SUBJECT_KEY_IDENTIFIER      (1 << 1)
  #define MBEDTLS_X509_EXT_KEY_USAGE                   (1 << 2)
  #define MBEDTLS_X509_EXT_CERTIFICATE_POLICIES        (1 << 3)
  #define MBEDTLS_X509_EXT_POLICY_MAPPINGS             (1 << 4)
  #define MBEDTLS_X509_EXT_SUBJECT_ALT_NAME            (1 << 5)    /* Supported (DNS) */
  #define MBEDTLS_X509_EXT_ISSUER_ALT_NAME             (1 << 6)
  #define MBEDTLS_X509_EXT_SUBJECT_DIRECTORY_ATTRS     (1 << 7)
  #define MBEDTLS_X509_EXT_BASIC_CONSTRAINTS           (1 << 8)    /* Supported */
  #define MBEDTLS_X509_EXT_NAME_CONSTRAINTS            (1 << 9)
  #define MBEDTLS_X509_EXT_POLICY_CONSTRAINTS          (1 << 10)
  #define MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE          (1 << 11)
  #define MBEDTLS_X509_EXT_CRL_DISTRIBUTION_POINTS     (1 << 12)
  #define MBEDTLS_X509_EXT_INIHIBIT_ANYPOLICY          (1 << 13)
  #define MBEDTLS_X509_EXT_FRESHEST_CRL                (1 << 14)
  
  #define MBEDTLS_X509_EXT_NS_CERT_TYPE                (1 << 16)
  
  /*
   * Storage format identifiers
   * Recognized formats: PEM and DER
   */
  #define MBEDTLS_X509_FORMAT_DER                 1
  #define MBEDTLS_X509_FORMAT_PEM                 2
  
  #define MBEDTLS_X509_MAX_DN_NAME_SIZE         256 /**< Maximum value size of a DN entry */
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  /**
   * \addtogroup x509_module
   * \{ */
  
  /**
   * \name Structures for parsing X.509 certificates, CRLs and CSRs
   * \{
   */
  
  /**
   * Type-length-value structure that allows for ASN1 using DER.
   */
  typedef mbedtls_asn1_buf mbedtls_x509_buf;
  
  /**
   * Container for ASN1 bit strings.
   */
  typedef mbedtls_asn1_bitstring mbedtls_x509_bitstring;
  
  /**
   * Container for ASN1 named information objects.
   * It allows for Relative Distinguished Names (e.g. cn=localhost,ou=code,etc.).
   */
  typedef mbedtls_asn1_named_data mbedtls_x509_name;
  
  /**
   * Container for a sequence of ASN.1 items
   */
  typedef mbedtls_asn1_sequence mbedtls_x509_sequence;
  
  /** Container for date and time (precision in seconds). */
  typedef struct mbedtls_x509_time
  {
      int year, mon, day;         /**< Date. */
      int hour, min, sec;         /**< Time. */
  }
  mbedtls_x509_time;
  
  /** \} name Structures for parsing X.509 certificates, CRLs and CSRs */
  /** \} addtogroup x509_module */
  
  /**
   * \brief          Store the certificate DN in printable form into buf;
   *                 no more than size characters will be written.
   *
   * \param buf      Buffer to write to
   * \param size     Maximum size of buffer
   * \param dn       The X509 name to represent
   *
   * \return         The length of the string written (not including the
   *                 terminated nul byte), or a negative error code.
   */
  int mbedtls_x509_dn_gets( char *buf, size_t size, const mbedtls_x509_name *dn );
  
  /**
   * \brief          Store the certificate serial in printable form into buf;
   *                 no more than size characters will be written.
   *
   * \param buf      Buffer to write to
   * \param size     Maximum size of buffer
   * \param serial   The X509 serial to represent
   *
   * \return         The length of the string written (not including the
   *                 terminated nul byte), or a negative error code.
   */
  int mbedtls_x509_serial_gets( char *buf, size_t size, const mbedtls_x509_buf *serial );
  
  /**
   * \brief          Check a given mbedtls_x509_time against the system time
   *                 and tell if it's in the past.
   *
   * \note           Intended usage is "if( is_past( valid_to ) ) ERROR".
   *                 Hence the return value of 1 if on internal errors.
   *
   * \param to       mbedtls_x509_time to check
   *
   * \return         1 if the given time is in the past or an error occured,
   *                 0 otherwise.
   */
  int mbedtls_x509_time_is_past( const mbedtls_x509_time *to );
  
  /**
   * \brief          Check a given mbedtls_x509_time against the system time
   *                 and tell if it's in the future.
   *
   * \note           Intended usage is "if( is_future( valid_from ) ) ERROR".
   *                 Hence the return value of 1 if on internal errors.
   *
   * \param from     mbedtls_x509_time to check
   *
   * \return         1 if the given time is in the future or an error occured,
   *                 0 otherwise.
   */
  int mbedtls_x509_time_is_future( const mbedtls_x509_time *from );
  
  /**
   * \brief          Checkup routine
   *
   * \return         0 if successful, or 1 if the test failed
   */
  int mbedtls_x509_self_test( int verbose );
  
  /*
   * Internal module functions. You probably do not want to use these unless you
   * know you do.
   */
  int mbedtls_x509_get_name( unsigned char **p, const unsigned char *end,
                     mbedtls_x509_name *cur );
  int mbedtls_x509_get_alg_null( unsigned char **p, const unsigned char *end,
                         mbedtls_x509_buf *alg );
  int mbedtls_x509_get_alg( unsigned char **p, const unsigned char *end,
                    mbedtls_x509_buf *alg, mbedtls_x509_buf *params );
  #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
  int mbedtls_x509_get_rsassa_pss_params( const mbedtls_x509_buf *params,
                                  mbedtls_md_type_t *md_alg, mbedtls_md_type_t *mgf_md,
                                  int *salt_len );
  #endif
  int mbedtls_x509_get_sig( unsigned char **p, const unsigned char *end, mbedtls_x509_buf *sig );
  int mbedtls_x509_get_sig_alg( const mbedtls_x509_buf *sig_oid, const mbedtls_x509_buf *sig_params,
                        mbedtls_md_type_t *md_alg, mbedtls_pk_type_t *pk_alg,
                        void **sig_opts );
  int mbedtls_x509_get_time( unsigned char **p, const unsigned char *end,
                     mbedtls_x509_time *t );
  int mbedtls_x509_get_serial( unsigned char **p, const unsigned char *end,
                       mbedtls_x509_buf *serial );
  int mbedtls_x509_get_ext( unsigned char **p, const unsigned char *end,
                    mbedtls_x509_buf *ext, int tag );
  int mbedtls_x509_sig_alg_gets( char *buf, size_t size, const mbedtls_x509_buf *sig_oid,
                         mbedtls_pk_type_t pk_alg, mbedtls_md_type_t md_alg,
                         const void *sig_opts );
  int mbedtls_x509_key_size_helper( char *buf, size_t buf_size, const char *name );
  int mbedtls_x509_string_to_names( mbedtls_asn1_named_data **head, const char *name );
  int mbedtls_x509_set_extension( mbedtls_asn1_named_data **head, const char *oid, size_t oid_len,
                          int critical, const unsigned char *val,
                          size_t val_len );
  int mbedtls_x509_write_extensions( unsigned char **p, unsigned char *start,
                             mbedtls_asn1_named_data *first );
  int mbedtls_x509_write_names( unsigned char **p, unsigned char *start,
                        mbedtls_asn1_named_data *first );
  int mbedtls_x509_write_sig( unsigned char **p, unsigned char *start,
                      const char *oid, size_t oid_len,
                      unsigned char *sig, size_t size );
  
  #define MBEDTLS_X509_SAFE_SNPRINTF                          \
      do {                                                    \
          if( ret < 0 || (size_t) ret >= n )                  \
              return( MBEDTLS_ERR_X509_BUFFER_TOO_SMALL );    \
                                                              \
          n -= (size_t) ret;                                  \
          p += (size_t) ret;                                  \
      } while( 0 )
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif /* x509.h */
  