text: /*
   * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
   *
   * Licensed under the OpenSSL license (the "License").  You may not use
   * this file except in compliance with the License.  You can obtain a copy
   * in the file LICENSE in the source distribution or at
   * https://www.openssl.org/source/license.html
   */
  
  #include <stdio.h>
  #include "internal/cryptlib.h"
  #include <openssl/bn.h>
  #include <openssl/evp.h>
  #include <openssl/asn1.h>
  #include <openssl/asn1t.h>
  #include <openssl/x509.h>
  #include "internal/x509_int.h"
  #include <openssl/objects.h>
  #include <openssl/buffer.h>
  #include <openssl/pem.h>
  
  X509_REQ *X509_to_X509_REQ(X509 *x, EVP_PKEY *pkey, const EVP_MD *md)
  {
      X509_REQ *ret;
      X509_REQ_INFO *ri;
      int i;
      EVP_PKEY *pktmp;
  
      ret = X509_REQ_new();
      if (ret == NULL) {
          X509err(X509_F_X509_TO_X509_REQ, ERR_R_MALLOC_FAILURE);
          goto err;
      }
  
      ri = &ret->req_info;
  
      ri->version->length = 1;
      ri->version->data = OPENSSL_malloc(1);
      if (ri->version->data == NULL)
          goto err;
      ri->version->data[0] = 0;   /* version == 0 */
  
      if (!X509_REQ_set_subject_name(ret, X509_get_subject_name(x)))
          goto err;
  
      pktmp = X509_get0_pubkey(x);
      if (pktmp == NULL)
          goto err;
      i = X509_REQ_set_pubkey(ret, pktmp);
      if (!i)
          goto err;
  
      if (pkey != NULL) {
          if (!X509_REQ_sign(ret, pkey, md))
              goto err;
      }
      return (ret);
   err:
      X509_REQ_free(ret);
      return (NULL);
  }
  
  EVP_PKEY *X509_REQ_get_pubkey(X509_REQ *req)
  {
      if (req == NULL)
          return (NULL);
      return (X509_PUBKEY_get(req->req_info.pubkey));
  }
  
  EVP_PKEY *X509_REQ_get0_pubkey(X509_REQ *req)
  {
      if (req == NULL)
          return NULL;
      return (X509_PUBKEY_get0(req->req_info.pubkey));
  }
  
  X509_PUBKEY *X509_REQ_get_X509_PUBKEY(X509_REQ *req)
  {
      return req->req_info.pubkey;
  }
  
  int X509_REQ_check_private_key(X509_REQ *x, EVP_PKEY *k)
  {
      EVP_PKEY *xk = NULL;
      int ok = 0;
  
      xk = X509_REQ_get_pubkey(x);
      switch (EVP_PKEY_cmp(xk, k)) {
      case 1:
          ok = 1;
          break;
      case 0:
          X509err(X509_F_X509_REQ_CHECK_PRIVATE_KEY,
                  X509_R_KEY_VALUES_MISMATCH);
          break;
      case -1:
          X509err(X509_F_X509_REQ_CHECK_PRIVATE_KEY, X509_R_KEY_TYPE_MISMATCH);
          break;
      case -2:
  #ifndef OPENSSL_NO_EC
          if (EVP_PKEY_id(k) == EVP_PKEY_EC) {
              X509err(X509_F_X509_REQ_CHECK_PRIVATE_KEY, ERR_R_EC_LIB);
              break;
          }
  #endif
  #ifndef OPENSSL_NO_DH
          if (EVP_PKEY_id(k) == EVP_PKEY_DH) {
              /* No idea */
              X509err(X509_F_X509_REQ_CHECK_PRIVATE_KEY,
                      X509_R_CANT_CHECK_DH_KEY);
              break;
          }
  #endif
          X509err(X509_F_X509_REQ_CHECK_PRIVATE_KEY, X509_R_UNKNOWN_KEY_TYPE);
      }
  
      EVP_PKEY_free(xk);
      return (ok);
  }
  
  /*
   * It seems several organisations had the same idea of including a list of
   * extensions in a certificate request. There are at least two OIDs that are
   * used and there may be more: so the list is configurable.
   */
  
  static int ext_nid_list[] = { NID_ext_req, NID_ms_ext_req, NID_undef };
  
  static int *ext_nids = ext_nid_list;
  
  int X509_REQ_extension_nid(int req_nid)
  {
      int i, nid;
      for (i = 0;; i++) {
          nid = ext_nids[i];
          if (nid == NID_undef)
              return 0;
          else if (req_nid == nid)
              return 1;
      }
  }
  
  int *X509_REQ_get_extension_nids(void)
  {
      return ext_nids;
  }
  
  void X509_REQ_set_extension_nids(int *nids)
  {
      ext_nids = nids;
  }
  
  STACK_OF(X509_EXTENSION) *X509_REQ_get_extensions(X509_REQ *req)
  {
      X509_ATTRIBUTE *attr;
      ASN1_TYPE *ext = NULL;
      int idx, *pnid;
      const unsigned char *p;
  
      if ((req == NULL) || !ext_nids)
          return (NULL);
      for (pnid = ext_nids; *pnid != NID_undef; pnid++) {
          idx = X509_REQ_get_attr_by_NID(req, *pnid, -1);
          if (idx == -1)
              continue;
          attr = X509_REQ_get_attr(req, idx);
          ext = X509_ATTRIBUTE_get0_type(attr, 0);
          break;
      }
      if (!ext || (ext->type != V_ASN1_SEQUENCE))
          return NULL;
      p = ext->value.sequence->data;
      return (STACK_OF(X509_EXTENSION) *)
          ASN1_item_d2i(NULL, &p, ext->value.sequence->length,
                        ASN1_ITEM_rptr(X509_EXTENSIONS));
  }
  
  /*
   * Add a STACK_OF extensions to a certificate request: allow alternative OIDs
   * in case we want to create a non standard one.
   */
  
  int X509_REQ_add_extensions_nid(X509_REQ *req, STACK_OF(X509_EXTENSION) *exts,
                                  int nid)
  {
      int extlen;
      int rv = 0;
      unsigned char *ext = NULL;
      /* Generate encoding of extensions */
      extlen = ASN1_item_i2d((ASN1_VALUE *)exts, &ext,
                             ASN1_ITEM_rptr(X509_EXTENSIONS));
      if (extlen <= 0)
          return 0;
      rv = X509_REQ_add1_attr_by_NID(req, nid, V_ASN1_SEQUENCE, ext, extlen);
      OPENSSL_free(ext);
      return rv;
  }
  
  /* This is the normal usage: use the "official" OID */
  int X509_REQ_add_extensions(X509_REQ *req, STACK_OF(X509_EXTENSION) *exts)
  {
      return X509_REQ_add_extensions_nid(req, exts, NID_ext_req);
  }
  
  /* Request attribute functions */
  
  int X509_REQ_get_attr_count(const X509_REQ *req)
  {
      return X509at_get_attr_count(req->req_info.attributes);
  }
  
  int X509_REQ_get_attr_by_NID(const X509_REQ *req, int nid, int lastpos)
  {
      return X509at_get_attr_by_NID(req->req_info.attributes, nid, lastpos);
  }
  
  int X509_REQ_get_attr_by_OBJ(const X509_REQ *req, ASN1_OBJECT *obj,
                               int lastpos)
  {
      return X509at_get_attr_by_OBJ(req->req_info.attributes, obj, lastpos);
  }
  
  X509_ATTRIBUTE *X509_REQ_get_attr(const X509_REQ *req, int loc)
  {
      return X509at_get_attr(req->req_info.attributes, loc);
  }
  
  X509_ATTRIBUTE *X509_REQ_delete_attr(X509_REQ *req, int loc)
  {
      return X509at_delete_attr(req->req_info.attributes, loc);
  }
  
  int X509_REQ_add1_attr(X509_REQ *req, X509_ATTRIBUTE *attr)
  {
      if (X509at_add1_attr(&req->req_info.attributes, attr))
          return 1;
      return 0;
  }
  
  int X509_REQ_add1_attr_by_OBJ(X509_REQ *req,
                                const ASN1_OBJECT *obj, int type,
                                const unsigned char *bytes, int len)
  {
      if (X509at_add1_attr_by_OBJ(&req->req_info.attributes, obj,
                                  type, bytes, len))
          return 1;
      return 0;
  }
  
  int X509_REQ_add1_attr_by_NID(X509_REQ *req,
                                int nid, int type,
                                const unsigned char *bytes, int len)
  {
      if (X509at_add1_attr_by_NID(&req->req_info.attributes, nid,
                                  type, bytes, len))
          return 1;
      return 0;
  }
  
  int X509_REQ_add1_attr_by_txt(X509_REQ *req,
                                const char *attrname, int type,
                                const unsigned char *bytes, int len)
  {
      if (X509at_add1_attr_by_txt(&req->req_info.attributes, attrname,
                                  type, bytes, len))
          return 1;
      return 0;
  }
  
  long X509_REQ_get_version(X509_REQ *req)
  {
      return ASN1_INTEGER_get(req->req_info.version);
  }
  
  X509_NAME *X509_REQ_get_subject_name(X509_REQ *req)
  {
      return req->req_info.subject;
  }
  
  void X509_REQ_get0_signature(ASN1_BIT_STRING **psig, X509_ALGOR **palg,
                               X509_REQ *req)
  {
      if (psig != NULL)
          *psig = req->signature;
      if (palg != NULL)
          *palg = &req->sig_alg;
  }
  
  int X509_REQ_get_signature_nid(const X509_REQ *req)
  {
      return OBJ_obj2nid(req->sig_alg.algorithm);
  }
  
  int i2d_re_X509_REQ_tbs(X509_REQ *req, unsigned char **pp)
  {
      req->req_info.enc.modified = 1;
      return i2d_X509_REQ_INFO(&req->req_info, pp);
  }
  