xref: /third_party/openssl/crypto/x509/v3_skid.c (revision e1051a39) 
1/*
2 * Copyright 1999-2021 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/x509v3.h>
13#include "crypto/x509.h"
14#include "ext_dat.h"
15
16static ASN1_OCTET_STRING *s2i_skey_id(X509V3_EXT_METHOD *method,
17                                      X509V3_CTX *ctx, char *str);
18const X509V3_EXT_METHOD ossl_v3_skey_id = {
19    NID_subject_key_identifier, 0, ASN1_ITEM_ref(ASN1_OCTET_STRING),
20    0, 0, 0, 0,
21    (X509V3_EXT_I2S)i2s_ASN1_OCTET_STRING,
22    (X509V3_EXT_S2I)s2i_skey_id,
23    0, 0, 0, 0,
24    NULL
25};
26
27char *i2s_ASN1_OCTET_STRING(X509V3_EXT_METHOD *method,
28                            const ASN1_OCTET_STRING *oct)
29{
30    return OPENSSL_buf2hexstr(oct->data, oct->length);
31}
32
33ASN1_OCTET_STRING *s2i_ASN1_OCTET_STRING(X509V3_EXT_METHOD *method,
34                                         X509V3_CTX *ctx, const char *str)
35{
36    ASN1_OCTET_STRING *oct;
37    long length;
38
39    if ((oct = ASN1_OCTET_STRING_new()) == NULL) {
40        ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
41        return NULL;
42    }
43
44    if ((oct->data = OPENSSL_hexstr2buf(str, &length)) == NULL) {
45        ASN1_OCTET_STRING_free(oct);
46        return NULL;
47    }
48
49    oct->length = length;
50
51    return oct;
52
53}
54
55ASN1_OCTET_STRING *ossl_x509_pubkey_hash(X509_PUBKEY *pubkey)
56{
57    ASN1_OCTET_STRING *oct;
58    const unsigned char *pk;
59    int pklen;
60    unsigned char pkey_dig[EVP_MAX_MD_SIZE];
61    unsigned int diglen;
62    const char *propq;
63    OSSL_LIB_CTX *libctx;
64    EVP_MD *md;
65
66    if (pubkey == NULL) {
67        ERR_raise(ERR_LIB_X509V3, X509V3_R_NO_PUBLIC_KEY);
68        return NULL;
69    }
70    if (!ossl_x509_PUBKEY_get0_libctx(&libctx, &propq, pubkey))
71        return NULL;
72    if ((md = EVP_MD_fetch(libctx, SN_sha1, propq)) == NULL)
73        return NULL;
74    if ((oct = ASN1_OCTET_STRING_new()) == NULL) {
75        EVP_MD_free(md);
76        return NULL;
77    }
78
79    X509_PUBKEY_get0_param(NULL, &pk, &pklen, NULL, pubkey);
80    if (EVP_Digest(pk, pklen, pkey_dig, &diglen, md, NULL)
81            && ASN1_OCTET_STRING_set(oct, pkey_dig, diglen)) {
82        EVP_MD_free(md);
83        return oct;
84    }
85
86    EVP_MD_free(md);
87    ASN1_OCTET_STRING_free(oct);
88    return NULL;
89}
90
91static ASN1_OCTET_STRING *s2i_skey_id(X509V3_EXT_METHOD *method,
92                                      X509V3_CTX *ctx, char *str)
93{
94    if (strcmp(str, "none") == 0)
95        return ASN1_OCTET_STRING_new(); /* dummy */
96
97    if (strcmp(str, "hash") != 0)
98        return s2i_ASN1_OCTET_STRING(method, ctx /* not used */, str);
99
100    if (ctx != NULL && (ctx->flags & X509V3_CTX_TEST) != 0)
101        return ASN1_OCTET_STRING_new();
102    if (ctx == NULL
103        || (ctx->subject_cert == NULL && ctx->subject_req == NULL)) {
104        ERR_raise(ERR_LIB_X509V3, X509V3_R_NO_SUBJECT_DETAILS);
105        return NULL;
106    }
107
108    return ossl_x509_pubkey_hash(ctx->subject_cert != NULL ?
109                                 ctx->subject_cert->cert_info.key :
110                                 ctx->subject_req->req_info.pubkey);
111}
112