xref: /openssl/crypto/ocsp/ocsp_lib.c (revision ed576acd)
1 /*
2  * Copyright 2000-2021 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 #include <stdio.h>
11 #include "internal/cryptlib.h"
12 #include <openssl/objects.h>
13 #include <openssl/x509.h>
14 #include <openssl/pem.h>
15 #include <openssl/x509v3.h>
16 #include <openssl/ocsp.h>
17 #include "ocsp_local.h"
18 #include <openssl/asn1t.h>
19 
20 /* Convert a certificate and its issuer to an OCSP_CERTID */
21 
OCSP_cert_to_id(const EVP_MD * dgst,const X509 * subject,const X509 * issuer)22 OCSP_CERTID *OCSP_cert_to_id(const EVP_MD *dgst, const X509 *subject,
23                              const X509 *issuer)
24 {
25     const X509_NAME *iname;
26     const ASN1_INTEGER *serial;
27     ASN1_BIT_STRING *ikey;
28 
29     if (!dgst)
30         dgst = EVP_sha1();
31     if (subject) {
32         iname = X509_get_issuer_name(subject);
33         serial = X509_get0_serialNumber(subject);
34     } else {
35         iname = X509_get_subject_name(issuer);
36         serial = NULL;
37     }
38     ikey = X509_get0_pubkey_bitstr(issuer);
39     return OCSP_cert_id_new(dgst, iname, ikey, serial);
40 }
41 
OCSP_cert_id_new(const EVP_MD * dgst,const X509_NAME * issuerName,const ASN1_BIT_STRING * issuerKey,const ASN1_INTEGER * serialNumber)42 OCSP_CERTID *OCSP_cert_id_new(const EVP_MD *dgst,
43                               const X509_NAME *issuerName,
44                               const ASN1_BIT_STRING *issuerKey,
45                               const ASN1_INTEGER *serialNumber)
46 {
47     int nid;
48     unsigned int i;
49     X509_ALGOR *alg;
50     OCSP_CERTID *cid = NULL;
51     unsigned char md[EVP_MAX_MD_SIZE];
52 
53     if ((cid = OCSP_CERTID_new()) == NULL)
54         goto err;
55 
56     alg = &cid->hashAlgorithm;
57     ASN1_OBJECT_free(alg->algorithm);
58     if ((nid = EVP_MD_get_type(dgst)) == NID_undef) {
59         ERR_raise(ERR_LIB_OCSP, OCSP_R_UNKNOWN_NID);
60         goto err;
61     }
62     if ((alg->algorithm = OBJ_nid2obj(nid)) == NULL)
63         goto err;
64     if ((alg->parameter = ASN1_TYPE_new()) == NULL)
65         goto err;
66     alg->parameter->type = V_ASN1_NULL;
67 
68     if (!X509_NAME_digest(issuerName, dgst, md, &i))
69         goto digerr;
70     if (!(ASN1_OCTET_STRING_set(&cid->issuerNameHash, md, i)))
71         goto err;
72 
73     /* Calculate the issuerKey hash, excluding tag and length */
74     if (!EVP_Digest(issuerKey->data, issuerKey->length, md, &i, dgst, NULL))
75         goto err;
76 
77     if (!(ASN1_OCTET_STRING_set(&cid->issuerKeyHash, md, i)))
78         goto err;
79 
80     if (serialNumber) {
81         if (ASN1_STRING_copy(&cid->serialNumber, serialNumber) == 0)
82             goto err;
83     }
84     return cid;
85  digerr:
86     ERR_raise(ERR_LIB_OCSP, OCSP_R_DIGEST_ERR);
87  err:
88     OCSP_CERTID_free(cid);
89     return NULL;
90 }
91 
OCSP_id_issuer_cmp(const OCSP_CERTID * a,const OCSP_CERTID * b)92 int OCSP_id_issuer_cmp(const OCSP_CERTID *a, const OCSP_CERTID *b)
93 {
94     int ret;
95     ret = OBJ_cmp(a->hashAlgorithm.algorithm, b->hashAlgorithm.algorithm);
96     if (ret)
97         return ret;
98     ret = ASN1_OCTET_STRING_cmp(&a->issuerNameHash, &b->issuerNameHash);
99     if (ret)
100         return ret;
101     return ASN1_OCTET_STRING_cmp(&a->issuerKeyHash, &b->issuerKeyHash);
102 }
103 
OCSP_id_cmp(const OCSP_CERTID * a,const OCSP_CERTID * b)104 int OCSP_id_cmp(const OCSP_CERTID *a, const OCSP_CERTID *b)
105 {
106     int ret;
107     ret = OCSP_id_issuer_cmp(a, b);
108     if (ret)
109         return ret;
110     return ASN1_INTEGER_cmp(&a->serialNumber, &b->serialNumber);
111 }
112 
113 IMPLEMENT_ASN1_DUP_FUNCTION(OCSP_CERTID)
114