text: /*
   * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
   *
   * Licensed under the Apache License 2.0 (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
   */
  
  /* We need to use some engine deprecated APIs */
  #define OPENSSL_SUPPRESS_DEPRECATED
  
  #include <stdio.h>
  #include <time.h>
  #include <sys/types.h>
  
  #include "internal/cryptlib.h"
  
  #include <openssl/engine.h>
  #include <openssl/err.h>
  #include <openssl/evp.h>
  #include <openssl/buffer.h>
  #include <openssl/x509.h>
  #include "crypto/x509.h"
  
  #ifndef OPENSSL_NO_DEPRECATED_3_0
  
  int ASN1_digest(i2d_of_void *i2d, const EVP_MD *type, char *data,
                  unsigned char *md, unsigned int *len)
  {
      int inl;
      unsigned char *str, *p;
  
      inl = i2d(data, NULL);
      if (inl <= 0) {
          ASN1err(ASN1_F_ASN1_DIGEST, ERR_R_INTERNAL_ERROR);
          return 0;
      }
      if ((str = OPENSSL_malloc(inl)) == NULL) {
          ASN1err(ASN1_F_ASN1_DIGEST, ERR_R_MALLOC_FAILURE);
          return 0;
      }
      p = str;
      i2d(data, &p);
  
      if (!EVP_Digest(str, inl, md, len, type, NULL)) {
          OPENSSL_free(str);
          return 0;
      }
      OPENSSL_free(str);
      return 1;
  }
  
  #endif
  
  int asn1_item_digest_ex(const ASN1_ITEM *it, const EVP_MD *md, void *asn,
                          unsigned char *data, unsigned int *len,
                          OPENSSL_CTX *libctx, const char *propq)
  {
      int i, ret = 0;
      unsigned char *str = NULL;
      EVP_MD *fetched_md = (EVP_MD *)md;
  
      i = ASN1_item_i2d(asn, &str, it);
      if (i < 0 || str == NULL)
          return 0;
  
      if (EVP_MD_provider(md) == NULL) {
  #if !defined(OPENSSL_NO_ENGINE)
          ENGINE *tmpeng = ENGINE_get_digest_engine(EVP_MD_type(md));
  
          if (tmpeng != NULL)
              ENGINE_finish(tmpeng);
          else
  #endif
              fetched_md = EVP_MD_fetch(libctx, EVP_MD_name(md), propq);
      }
       if (fetched_md == NULL)
           goto err;
  
      ret = EVP_Digest(str, i, data, len, fetched_md, NULL);
  err:
      OPENSSL_free(str);
      if (fetched_md != md)
          EVP_MD_free(fetched_md);
      return ret;
  }
  
  int ASN1_item_digest(const ASN1_ITEM *it, const EVP_MD *md, void *asn,
                       unsigned char *data, unsigned int *len)
  {
      return asn1_item_digest_ex(it, md, asn, data, len, NULL, NULL);
  }
  
  