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
22OCSP_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
42OCSP_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
92int 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
104int 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
113IMPLEMENT_ASN1_DUP_FUNCTION(OCSP_CERTID)
114