2 * Written by Rob Stradling (rob@comodo.com) and Stephen Henson
3 * (steve@openssl.org) for the OpenSSL project 2014.
5 /* ====================================================================
6 * Copyright (c) 2014 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
61 #include <openssl/ct.h>
62 #include <openssl/err.h>
63 #include <openssl/evp.h>
64 #include <openssl/x509.h>
68 #define n2s(c,s) ((s=(((unsigned int)((c)[0]))<< 8)| \
69 (((unsigned int)((c)[1])) )),c+=2)
71 #define s2n(s,c) ((c[0]=(unsigned char)(((s)>> 8)&0xff), \
72 c[1]=(unsigned char)(((s) )&0xff)),c+=2)
74 #define l2n3(l,c) ((c[0]=(unsigned char)(((l)>>16)&0xff), \
75 c[1]=(unsigned char)(((l)>> 8)&0xff), \
76 c[2]=(unsigned char)(((l) )&0xff)),c+=3)
78 #define n2l8(c,l) (l =((uint64_t)(*((c)++)))<<56, \
79 l|=((uint64_t)(*((c)++)))<<48, \
80 l|=((uint64_t)(*((c)++)))<<40, \
81 l|=((uint64_t)(*((c)++)))<<32, \
82 l|=((uint64_t)(*((c)++)))<<24, \
83 l|=((uint64_t)(*((c)++)))<<16, \
84 l|=((uint64_t)(*((c)++)))<< 8, \
85 l|=((uint64_t)(*((c)++))))
87 #define l2n8(l,c) (*((c)++)=(unsigned char)(((l)>>56)&0xff), \
88 *((c)++)=(unsigned char)(((l)>>48)&0xff), \
89 *((c)++)=(unsigned char)(((l)>>40)&0xff), \
90 *((c)++)=(unsigned char)(((l)>>32)&0xff), \
91 *((c)++)=(unsigned char)(((l)>>24)&0xff), \
92 *((c)++)=(unsigned char)(((l)>>16)&0xff), \
93 *((c)++)=(unsigned char)(((l)>> 8)&0xff), \
94 *((c)++)=(unsigned char)(((l) )&0xff))
96 typedef enum sct_signature_type_t
{
97 SIGNATURE_TYPE_NOT_SET
= -1,
98 SIGNATURE_TYPE_CERT_TIMESTAMP
,
99 SIGNATURE_TYPE_TREE_HASH
100 } SCT_SIGNATURE_TYPE
;
103 * Update encoding for SCT signature verification/generation to supplied
106 static int sct_ctx_update(EVP_MD_CTX
*ctx
, const SCT_CTX
*sctx
, const SCT
*sct
)
108 unsigned char tmpbuf
[12];
109 unsigned char *p
, *der
;
112 * digitally-signed struct { (1 byte) Version sct_version; (1 byte)
113 * SignatureType signature_type = certificate_timestamp; (8 bytes) uint64
114 * timestamp; (2 bytes) LogEntryType entry_type; (? bytes)
115 * select(entry_type) { case x509_entry: ASN.1Cert; case precert_entry:
116 * PreCert; } signed_entry; (2 bytes + sct->ext_len) CtExtensions
120 if (sct
->entry_type
== CT_LOG_ENTRY_TYPE_NOT_SET
)
123 if (sct
->entry_type
== CT_LOG_ENTRY_TYPE_PRECERT
&& sctx
->ihash
== NULL
)
129 *p
++ = SIGNATURE_TYPE_CERT_TIMESTAMP
;
130 l2n8(sct
->timestamp
, p
);
131 s2n(sct
->entry_type
, p
);
133 if (!EVP_DigestUpdate(ctx
, tmpbuf
, p
- tmpbuf
))
136 if (sct
->entry_type
== CT_LOG_ENTRY_TYPE_X509
) {
138 derlen
= sctx
->certderlen
;
140 if (!EVP_DigestUpdate(ctx
, sctx
->ihash
, sctx
->ihashlen
))
143 derlen
= sctx
->prederlen
;
146 /* If no encoding available, fatal error */
150 /* Include length first */
154 if (!EVP_DigestUpdate(ctx
, tmpbuf
, 3))
156 if (!EVP_DigestUpdate(ctx
, der
, derlen
))
159 /* Add any extensions */
161 s2n(sct
->ext_len
, p
);
162 if (!EVP_DigestUpdate(ctx
, tmpbuf
, 2))
165 if (sct
->ext_len
&& !EVP_DigestUpdate(ctx
, sct
->ext
, sct
->ext_len
))
171 int SCT_verify(const SCT_CTX
*sctx
, const SCT
*sct
)
173 EVP_MD_CTX
*ctx
= NULL
;
175 if (!SCT_is_complete(sct
) || sctx
->pkey
== NULL
||
176 sct
->entry_type
== CT_LOG_ENTRY_TYPE_NOT_SET
||
177 (sct
->entry_type
== CT_LOG_ENTRY_TYPE_PRECERT
&& sctx
->ihash
== NULL
)) {
178 CTerr(CT_F_SCT_VERIFY
, CT_R_SCT_NOT_SET
);
181 if (sct
->version
!= SCT_VERSION_V1
) {
182 CTerr(CT_F_SCT_VERIFY
, CT_R_SCT_UNSUPPORTED_VERSION
);
185 if (sct
->log_id_len
!= sctx
->pkeyhashlen
||
186 memcmp(sct
->log_id
, sctx
->pkeyhash
, sctx
->pkeyhashlen
) != 0) {
187 CTerr(CT_F_SCT_VERIFY
, CT_R_SCT_LOG_ID_MISMATCH
);
190 ctx
= EVP_MD_CTX_new();
194 if (!EVP_DigestVerifyInit(ctx
, NULL
, EVP_sha256(), NULL
, sctx
->pkey
))
197 if (!sct_ctx_update(ctx
, sctx
, sct
))
200 /* Verify signature */
201 ret
= EVP_DigestVerifyFinal(ctx
, sct
->sig
, sct
->sig_len
);
202 /* If ret < 0 some other error: fall through without setting error */
204 CTerr(CT_F_SCT_VERIFY
, CT_R_SCT_INVALID_SIGNATURE
);
207 EVP_MD_CTX_free(ctx
);
211 int SCT_verify_v1(SCT
*sct
, X509
*cert
, X509
*preissuer
,
212 X509_PUBKEY
*log_pubkey
, X509
*issuer_cert
)
215 SCT_CTX
*sctx
= NULL
;
217 if (sct
== NULL
|| cert
== NULL
|| log_pubkey
== NULL
||
218 (sct
->entry_type
== CT_LOG_ENTRY_TYPE_PRECERT
&& issuer_cert
== NULL
)) {
219 CTerr(CT_F_SCT_VERIFY_V1
, ERR_R_PASSED_NULL_PARAMETER
);
221 } else if (!SCT_is_complete(sct
)) {
222 CTerr(CT_F_SCT_VERIFY_V1
, CT_R_SCT_NOT_SET
);
224 } else if (sct
->version
!= 0) {
225 CTerr(CT_F_SCT_VERIFY_V1
, CT_R_SCT_UNSUPPORTED_VERSION
);
229 sctx
= SCT_CTX_new();
233 ret
= SCT_CTX_set1_pubkey(sctx
, log_pubkey
);
238 ret
= SCT_CTX_set1_cert(sctx
, cert
, preissuer
);
243 if (sct
->entry_type
== CT_LOG_ENTRY_TYPE_PRECERT
) {
244 ret
= SCT_CTX_set1_issuer(sctx
, issuer_cert
);
249 ret
= SCT_verify(sctx
, sct
);