text: /* crypto/x509/x509_vfy.h */
  /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   * All rights reserved.
   *
   * This package is an SSL implementation written
   * by Eric Young (eay@cryptsoft.com).
   * The implementation was written so as to conform with Netscapes SSL.
   * 
   * This library is free for commercial and non-commercial use as long as
   * the following conditions are aheared to.  The following conditions
   * apply to all code found in this distribution, be it the RC4, RSA,
   * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
   * included with this distribution is covered by the same copyright terms
   * except that the holder is Tim Hudson (tjh@cryptsoft.com).
   * 
   * Copyright remains Eric Young's, and as such any Copyright notices in
   * the code are not to be removed.
   * If this package is used in a product, Eric Young should be given attribution
   * as the author of the parts of the library used.
   * This can be in the form of a textual message at program startup or
   * in documentation (online or textual) provided with the package.
   * 
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *    "This product includes cryptographic software written by
   *     Eric Young (eay@cryptsoft.com)"
   *    The word 'cryptographic' can be left out if the rouines from the library
   *    being used are not cryptographic related :-).
   * 4. If you include any Windows specific code (or a derivative thereof) from 
   *    the apps directory (application code) you must include an acknowledgement:
   *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
   * 
   * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * 
   * The licence and distribution terms for any publically available version or
   * derivative of this code cannot be changed.  i.e. this code cannot simply be
   * copied and put under another distribution licence
   * [including the GNU Public Licence.]
   */
  
  #ifndef HEADER_X509_H
  #include <openssl/x509.h>
  /* openssl/x509.h ends up #include-ing this file at about the only
   * appropriate moment. */
  #endif
  
  #ifndef HEADER_X509_VFY_H
  #define HEADER_X509_VFY_H
  
  #ifndef NO_LHASH
  #include <openssl/lhash.h>
  #endif
  #include <openssl/bio.h>
  #include <openssl/crypto.h>
  
  #ifdef  __cplusplus
  extern "C" {
  #endif
  
  /* Outer object */
  typedef struct x509_hash_dir_st
  	{
  	int num_dirs;
  	char **dirs;
  	int *dirs_type;
  	int num_dirs_alloced;
  	} X509_HASH_DIR_CTX;
  
  typedef struct x509_file_st
  	{
  	int num_paths;	/* number of paths to files or directories */
  	int num_alloced;
  	char **paths;	/* the list of paths or directories */
  	int *path_type;
  	} X509_CERT_FILE_CTX;
  
  /*******************************/
  /*
  SSL_CTX -> X509_STORE    
  		-> X509_LOOKUP
  			->X509_LOOKUP_METHOD
  		-> X509_LOOKUP
  			->X509_LOOKUP_METHOD
   
  SSL	-> X509_STORE_CTX
  		->X509_STORE    
  
  The X509_STORE holds the tables etc for verification stuff.
  A X509_STORE_CTX is used while validating a single certificate.
  The X509_STORE has X509_LOOKUPs for looking up certs.
  The X509_STORE then calls a function to actually verify the
  certificate chain.
  */
  
  #define X509_LU_RETRY		-1
  #define X509_LU_FAIL		0
  #define X509_LU_X509		1
  #define X509_LU_CRL		2
  #define X509_LU_PKEY		3
  
  typedef struct x509_object_st
  	{
  	/* one of the above types */
  	int type;
  	union	{
  		char *ptr;
  		X509 *x509;
  		X509_CRL *crl;
  		EVP_PKEY *pkey;
  		} data;
  	} X509_OBJECT;
  
  typedef struct x509_lookup_st X509_LOOKUP;
  
  DECLARE_STACK_OF(X509_LOOKUP)
  DECLARE_STACK_OF(X509_OBJECT)
  
  /* This is a static that defines the function interface */
  typedef struct x509_lookup_method_st
  	{
  	const char *name;
  	int (*new_item)(X509_LOOKUP *ctx);
  	void (*free)(X509_LOOKUP *ctx);
  	int (*init)(X509_LOOKUP *ctx);
  	int (*shutdown)(X509_LOOKUP *ctx);
  	int (*ctrl)(X509_LOOKUP *ctx,int cmd,const char *argc,long argl,
  			char **ret);
  	int (*get_by_subject)(X509_LOOKUP *ctx,int type,X509_NAME *name,
  			      X509_OBJECT *ret);
  	int (*get_by_issuer_serial)(X509_LOOKUP *ctx,int type,X509_NAME *name,
  				    ASN1_INTEGER *serial,X509_OBJECT *ret);
  	int (*get_by_fingerprint)(X509_LOOKUP *ctx,int type,
  				  unsigned char *bytes,int len,
  				  X509_OBJECT *ret);
  	int (*get_by_alias)(X509_LOOKUP *ctx,int type,char *str,int len,
  			    X509_OBJECT *ret);
  	} X509_LOOKUP_METHOD;
  
  typedef struct x509_store_ctx_st X509_STORE_CTX;
  
  /* This is used to hold everything.  It is used for all certificate
   * validation.  Once we have a certificate chain, the 'verify'
   * function is then called to actually check the cert chain. */
  typedef struct x509_store_st
  	{
  	/* The following is a cache of trusted certs */
  	int cache; 	/* if true, stash any hits */
  	STACK_OF(X509_OBJECT) *objs;	/* Cache of all objects */
  
  	/* These are external lookup methods */
  	STACK_OF(X509_LOOKUP) *get_cert_methods;
  	int (*verify)(X509_STORE_CTX *ctx);	/* called to verify a certificate */
  	int (*verify_cb)(int ok,X509_STORE_CTX *ctx);	/* error callback */
  
  	CRYPTO_EX_DATA ex_data;
  	int references;
  	int depth;		/* how deep to look (still unused -- X509_STORE_CTX's depth is used) */
  	}  X509_STORE;
  
  #define X509_STORE_set_depth(ctx,d)       ((ctx)->depth=(d))
  
  #define X509_STORE_set_verify_cb_func(ctx,func) ((ctx)->verify_cb=(func))
  #define X509_STORE_set_verify_func(ctx,func)	((ctx)->verify=(func))
  
  /* This is the functions plus an instance of the local variables. */
  struct x509_lookup_st
  	{
  	int init;			/* have we been started */
  	int skip;			/* don't use us. */
  	X509_LOOKUP_METHOD *method;	/* the functions */
  	char *method_data;		/* method data */
  
  	X509_STORE *store_ctx;	/* who owns us */
  	};
  
  /* This is a used when verifying cert chains.  Since the
   * gathering of the cert chain can take some time (and have to be
   * 'retried', this needs to be kept and passed around. */
  struct x509_store_ctx_st      /* X509_STORE_CTX */
  	{
  	X509_STORE *ctx;
  	int current_method;	/* used when looking up certs */
  
  	/* The following are set by the caller */
  	X509 *cert;		/* The cert to check */
  	STACK_OF(X509) *untrusted;	/* chain of X509s - untrusted - passed in */
  	int purpose;		/* purpose to check untrusted certificates */
  	int trust;		/* trust setting to check */
  	time_t	check_time;	/* time to make verify at */
  	unsigned long flags;	/* Various verify flags */
  	void *other_ctx;	/* Other info for use with get_issuer() */
  
  	/* Callbacks for various operations */
  	int (*verify)(X509_STORE_CTX *ctx);	/* called to verify a certificate */
  	int (*verify_cb)(int ok,X509_STORE_CTX *ctx);		/* error callback */
  	int (*get_issuer)(X509 **issuer, X509_STORE_CTX *ctx, X509 *x);	/* get issuers cert from ctx */
  	int (*check_issued)(X509_STORE_CTX *ctx, X509 *x, X509 *issuer); /* check issued */
  	int (*cleanup)(X509_STORE_CTX *ctx);
  
  	/* The following is built up */
  	int depth;		/* how far to go looking up certs */
  	int valid;		/* if 0, rebuild chain */
  	int last_untrusted;	/* index of last untrusted cert */
  	STACK_OF(X509) *chain; 		/* chain of X509s - built up and trusted */
  
  	/* When something goes wrong, this is why */
  	int error_depth;
  	int error;
  	X509 *current_cert;
  	X509 *current_issuer;	/* cert currently being tested as valid issuer */
  
  	CRYPTO_EX_DATA ex_data;
  	};
  
  #define X509_STORE_CTX_set_depth(ctx,d)       ((ctx)->depth=(d))
  
  #define X509_STORE_CTX_set_app_data(ctx,data) \
  	X509_STORE_CTX_set_ex_data(ctx,0,data)
  #define X509_STORE_CTX_get_app_data(ctx) \
  	X509_STORE_CTX_get_ex_data(ctx,0)
  
  #define X509_L_FILE_LOAD	1
  #define X509_L_ADD_DIR		2
  
  #define X509_LOOKUP_load_file(x,name,type) \
  		X509_LOOKUP_ctrl((x),X509_L_FILE_LOAD,(name),(long)(type),NULL)
  
  #define X509_LOOKUP_add_dir(x,name,type) \
  		X509_LOOKUP_ctrl((x),X509_L_ADD_DIR,(name),(long)(type),NULL)
  
  #define		X509_V_OK					0
  /* illegal error (for uninitialized values, to avoid X509_V_OK): 1 */
  
  #define		X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT		2
  #define		X509_V_ERR_UNABLE_TO_GET_CRL			3
  #define		X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE	4
  #define		X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE	5
  #define		X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY	6
  #define		X509_V_ERR_CERT_SIGNATURE_FAILURE		7
  #define		X509_V_ERR_CRL_SIGNATURE_FAILURE		8
  #define		X509_V_ERR_CERT_NOT_YET_VALID			9	
  #define		X509_V_ERR_CERT_HAS_EXPIRED			10
  #define		X509_V_ERR_CRL_NOT_YET_VALID			11
  #define		X509_V_ERR_CRL_HAS_EXPIRED			12
  #define		X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD	13
  #define		X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD	14
  #define		X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD	15
  #define		X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD	16
  #define		X509_V_ERR_OUT_OF_MEM				17
  #define		X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT		18
  #define		X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN		19
  #define		X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY	20
  #define		X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE	21
  #define		X509_V_ERR_CERT_CHAIN_TOO_LONG			22
  #define		X509_V_ERR_CERT_REVOKED				23
  #define		X509_V_ERR_INVALID_CA				24
  #define		X509_V_ERR_PATH_LENGTH_EXCEEDED			25
  #define		X509_V_ERR_INVALID_PURPOSE			26
  #define		X509_V_ERR_CERT_UNTRUSTED			27
  #define		X509_V_ERR_CERT_REJECTED			28
  /* These are 'informational' when looking for issuer cert */
  #define		X509_V_ERR_SUBJECT_ISSUER_MISMATCH		29
  #define		X509_V_ERR_AKID_SKID_MISMATCH			30
  #define		X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH		31
  #define		X509_V_ERR_KEYUSAGE_NO_CERTSIGN			32
  
  /* The application is not happy */
  #define		X509_V_ERR_APPLICATION_VERIFICATION		50
  
  /* Certificate verify flags */
  
  #define	X509_V_FLAG_CB_ISSUER_CHECK		0x1	/* Send issuer+subject checks to verify_cb */
  #define	X509_V_FLAG_USE_CHECK_TIME		0x2	/* Use check time instead of current time */
  
  		  /* These functions are being redefined in another directory,
  		     and clash when the linker is case-insensitive, so let's
  		     hide them a little, by giving them an extra 'o' at the
  		     beginning of the name... */
  #ifdef VMS
  #undef X509v3_cleanup_extensions
  #define X509v3_cleanup_extensions oX509v3_cleanup_extensions
  #undef X509v3_add_extension
  #define X509v3_add_extension oX509v3_add_extension
  #undef X509v3_add_netscape_extensions
  #define X509v3_add_netscape_extensions oX509v3_add_netscape_extensions
  #undef X509v3_add_standard_extensions
  #define X509v3_add_standard_extensions oX509v3_add_standard_extensions
  #endif
  
  int X509_OBJECT_idx_by_subject(STACK_OF(X509_OBJECT) *h, int type,
  	     X509_NAME *name);
  X509_OBJECT *X509_OBJECT_retrieve_by_subject(STACK_OF(X509_OBJECT) *h,int type,X509_NAME *name);
  X509_OBJECT *X509_OBJECT_retrieve_match(STACK_OF(X509_OBJECT) *h, X509_OBJECT *x);
  void X509_OBJECT_up_ref_count(X509_OBJECT *a);
  void X509_OBJECT_free_contents(X509_OBJECT *a);
  X509_STORE *X509_STORE_new(void );
  void X509_STORE_free(X509_STORE *v);
  
  X509_STORE_CTX *X509_STORE_CTX_new(void);
  
  int X509_STORE_CTX_get1_issuer(X509 **issuer, X509_STORE_CTX *ctx, X509 *x);
  
  void X509_STORE_CTX_free(X509_STORE_CTX *ctx);
  void X509_STORE_CTX_init(X509_STORE_CTX *ctx, X509_STORE *store,
  			 X509 *x509, STACK_OF(X509) *chain);
  void X509_STORE_CTX_trusted_stack(X509_STORE_CTX *ctx, STACK_OF(X509) *sk);
  void X509_STORE_CTX_cleanup(X509_STORE_CTX *ctx);
  
  X509_LOOKUP *X509_STORE_add_lookup(X509_STORE *v, X509_LOOKUP_METHOD *m);
  
  X509_LOOKUP_METHOD *X509_LOOKUP_hash_dir(void);
  X509_LOOKUP_METHOD *X509_LOOKUP_file(void);
  
  int X509_STORE_add_cert(X509_STORE *ctx, X509 *x);
  int X509_STORE_add_crl(X509_STORE *ctx, X509_CRL *x);
  
  int X509_STORE_get_by_subject(X509_STORE_CTX *vs,int type,X509_NAME *name,
  	X509_OBJECT *ret);
  
  int X509_LOOKUP_ctrl(X509_LOOKUP *ctx, int cmd, const char *argc,
  	long argl, char **ret);
  
  #ifndef NO_STDIO
  int X509_load_cert_file(X509_LOOKUP *ctx, const char *file, int type);
  int X509_load_crl_file(X509_LOOKUP *ctx, const char *file, int type);
  int X509_load_cert_crl_file(X509_LOOKUP *ctx, const char *file, int type);
  #endif
  
  
  X509_LOOKUP *X509_LOOKUP_new(X509_LOOKUP_METHOD *method);
  void X509_LOOKUP_free(X509_LOOKUP *ctx);
  int X509_LOOKUP_init(X509_LOOKUP *ctx);
  int X509_LOOKUP_by_subject(X509_LOOKUP *ctx, int type, X509_NAME *name,
  	X509_OBJECT *ret);
  int X509_LOOKUP_by_issuer_serial(X509_LOOKUP *ctx, int type, X509_NAME *name,
  	ASN1_INTEGER *serial, X509_OBJECT *ret);
  int X509_LOOKUP_by_fingerprint(X509_LOOKUP *ctx, int type,
  	unsigned char *bytes, int len, X509_OBJECT *ret);
  int X509_LOOKUP_by_alias(X509_LOOKUP *ctx, int type, char *str,
  	int len, X509_OBJECT *ret);
  int X509_LOOKUP_shutdown(X509_LOOKUP *ctx);
  
  #ifndef NO_STDIO
  int	X509_STORE_load_locations (X509_STORE *ctx,
  		const char *file, const char *dir);
  int	X509_STORE_set_default_paths(X509_STORE *ctx);
  #endif
  
  int X509_STORE_CTX_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
  	CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);
  int	X509_STORE_CTX_set_ex_data(X509_STORE_CTX *ctx,int idx,void *data);
  void *	X509_STORE_CTX_get_ex_data(X509_STORE_CTX *ctx,int idx);
  int	X509_STORE_CTX_get_error(X509_STORE_CTX *ctx);
  void	X509_STORE_CTX_set_error(X509_STORE_CTX *ctx,int s);
  int	X509_STORE_CTX_get_error_depth(X509_STORE_CTX *ctx);
  X509 *	X509_STORE_CTX_get_current_cert(X509_STORE_CTX *ctx);
  STACK_OF(X509) *X509_STORE_CTX_get_chain(X509_STORE_CTX *ctx);
  STACK_OF(X509) *X509_STORE_CTX_get1_chain(X509_STORE_CTX *ctx);
  void	X509_STORE_CTX_set_cert(X509_STORE_CTX *c,X509 *x);
  void	X509_STORE_CTX_set_chain(X509_STORE_CTX *c,STACK_OF(X509) *sk);
  int X509_STORE_CTX_set_purpose(X509_STORE_CTX *ctx, int purpose);
  int X509_STORE_CTX_set_trust(X509_STORE_CTX *ctx, int trust);
  int X509_STORE_CTX_purpose_inherit(X509_STORE_CTX *ctx, int def_purpose,
  				int purpose, int trust);
  void X509_STORE_CTX_set_flags(X509_STORE_CTX *ctx, long flags);
  void X509_STORE_CTX_set_time(X509_STORE_CTX *ctx, long flags, time_t t);
  void X509_STORE_CTX_set_verify_cb(X509_STORE_CTX *ctx,
  				  int (*verify_cb)(int, X509_STORE_CTX *));
  
  #ifdef  __cplusplus
  }
  #endif
  #endif
  
  