crypto/asn1/a_digest.c

   1 /*
   2  * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 /* We need to use some engine deprecated APIs */
  11 #define OPENSSL_SUPPRESS_DEPRECATED
  12
  13 #include <stdio.h>
  14 #include <time.h>
  15 #include <sys/types.h>
  16
  17 #include "internal/cryptlib.h"
  18
  19 #include <openssl/engine.h>
  20 #include <openssl/err.h>
  21 #include <openssl/evp.h>
  22 #include <openssl/buffer.h>
  23 #include <openssl/x509.h>
  24 #include "crypto/x509.h"
  25
  26 #ifndef OPENSSL_NO_DEPRECATED_3_0
  27
  28 int ASN1_digest(i2d_of_void *i2d, const EVP_MD *type, char *data,
  29                 unsigned char *md, unsigned int *len)
  30 {
  31     int inl;
  32     unsigned char *str, *p;
  33
  34     inl = i2d(data, NULL);
  35     if (inl <= 0) {
  36         ASN1err(ASN1_F_ASN1_DIGEST, ERR_R_INTERNAL_ERROR);
  37         return 0;
  38     }
  39     if ((str = OPENSSL_malloc(inl)) == NULL) {
  40         ASN1err(ASN1_F_ASN1_DIGEST, ERR_R_MALLOC_FAILURE);
  41         return 0;
  42     }
  43     p = str;
  44     i2d(data, &p);
  45
  46     if (!EVP_Digest(str, inl, md, len, type, NULL)) {
  47         OPENSSL_free(str);
  48         return 0;
  49     }
  50     OPENSSL_free(str);
  51     return 1;
  52 }
  53
  54 #endif
  55
  56 int asn1_item_digest_ex(const ASN1_ITEM *it, const EVP_MD *md, void *asn,
  57                         unsigned char *data, unsigned int *len,
  58                         OSSL_LIB_CTX *libctx, const char *propq)
  59 {
  60     int i, ret = 0;
  61     unsigned char *str = NULL;
  62     EVP_MD *fetched_md = (EVP_MD *)md;
  63
  64     i = ASN1_item_i2d(asn, &str, it);
  65     if (i < 0 || str == NULL)
  66         return 0;
  67
  68     if (EVP_MD_provider(md) == NULL) {
  69 #if !defined(OPENSSL_NO_ENGINE)
  70         ENGINE *tmpeng = ENGINE_get_digest_engine(EVP_MD_type(md));
  71
  72         if (tmpeng != NULL)
  73             ENGINE_finish(tmpeng);
  74         else
  75 #endif
  76             fetched_md = EVP_MD_fetch(libctx, EVP_MD_name(md), propq);
  77     }
  78      if (fetched_md == NULL)
  79          goto err;
  80
  81     ret = EVP_Digest(str, i, data, len, fetched_md, NULL);
  82 err:
  83     OPENSSL_free(str);
  84     if (fetched_md != md)
  85         EVP_MD_free(fetched_md);
  86     return ret;
  87 }
  88
  89 int ASN1_item_digest(const ASN1_ITEM *it, const EVP_MD *md, void *asn,
  90                      unsigned char *data, unsigned int *len)
  91 {
  92     return asn1_item_digest_ex(it, md, asn, data, len, NULL, NULL);
  93 }
  94