xref: /openssl/crypto/asn1/a_digest.c (revision e077455e)
1 /*
2  * Copyright 1995-2021 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 
ASN1_digest(i2d_of_void * i2d,const EVP_MD * type,char * data,unsigned char * md,unsigned int * len)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         ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
37         return 0;
38     }
39     if ((str = OPENSSL_malloc(inl)) == NULL)
40         return 0;
41     p = str;
42     i2d(data, &p);
43 
44     if (!EVP_Digest(str, inl, md, len, type, NULL)) {
45         OPENSSL_free(str);
46         return 0;
47     }
48     OPENSSL_free(str);
49     return 1;
50 }
51 
52 #endif
53 
ossl_asn1_item_digest_ex(const ASN1_ITEM * it,const EVP_MD * md,void * asn,unsigned char * data,unsigned int * len,OSSL_LIB_CTX * libctx,const char * propq)54 int ossl_asn1_item_digest_ex(const ASN1_ITEM *it, const EVP_MD *md, void *asn,
55                              unsigned char *data, unsigned int *len,
56                              OSSL_LIB_CTX *libctx, const char *propq)
57 {
58     int i, ret = 0;
59     unsigned char *str = NULL;
60     EVP_MD *fetched_md = (EVP_MD *)md;
61 
62     i = ASN1_item_i2d(asn, &str, it);
63     if (i < 0 || str == NULL)
64         return 0;
65 
66     if (EVP_MD_get0_provider(md) == NULL) {
67 #if !defined(OPENSSL_NO_ENGINE)
68         ENGINE *tmpeng = ENGINE_get_digest_engine(EVP_MD_get_type(md));
69 
70         if (tmpeng != NULL)
71             ENGINE_finish(tmpeng);
72         else
73 #endif
74             fetched_md = EVP_MD_fetch(libctx, EVP_MD_get0_name(md), propq);
75     }
76     if (fetched_md == NULL)
77         goto err;
78 
79     ret = EVP_Digest(str, i, data, len, fetched_md, NULL);
80 err:
81     OPENSSL_free(str);
82     if (fetched_md != md)
83         EVP_MD_free(fetched_md);
84     return ret;
85 }
86 
ASN1_item_digest(const ASN1_ITEM * it,const EVP_MD * md,void * asn,unsigned char * data,unsigned int * len)87 int ASN1_item_digest(const ASN1_ITEM *it, const EVP_MD *md, void *asn,
88                      unsigned char *data, unsigned int *len)
89 {
90     return ossl_asn1_item_digest_ex(it, md, asn, data, len, NULL, NULL);
91 }
92 
93