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 {
113 * (1 byte) Version sct_version;
114 * (1 byte) SignatureType signature_type = certificate_timestamp;
115 * (8 bytes) uint64 timestamp;
116 * (2 bytes) LogEntryType entry_type;
117 * (? bytes) select(entry_type) {
118 * case x509_entry: ASN.1Cert;
119 * case precert_entry: PreCert;
121 * (2 bytes + sct->ext_len) CtExtensions extensions;
124 if (sct->entry_type == CT_LOG_ENTRY_TYPE_NOT_SET)
126 if (sct->entry_type == CT_LOG_ENTRY_TYPE_PRECERT && sctx->ihash == NULL)
131 *p++ = SIGNATURE_TYPE_CERT_TIMESTAMP;
132 l2n8(sct->timestamp, p);
133 s2n(sct->entry_type, p);
135 if (!EVP_DigestUpdate(ctx, tmpbuf, p - tmpbuf))
138 if (sct->entry_type == CT_LOG_ENTRY_TYPE_X509) {
140 derlen = sctx->certderlen;
142 if (!EVP_DigestUpdate(ctx, sctx->ihash, sctx->ihashlen))
145 derlen = sctx->prederlen;
148 /* If no encoding available, fatal error */
152 /* Include length first */
156 if (!EVP_DigestUpdate(ctx, tmpbuf, 3))
158 if (!EVP_DigestUpdate(ctx, der, derlen))
161 /* Add any extensions */
163 s2n(sct->ext_len, p);
164 if (!EVP_DigestUpdate(ctx, tmpbuf, 2))
167 if (sct->ext_len && !EVP_DigestUpdate(ctx, sct->ext, sct->ext_len))
173 int SCT_verify(const SCT_CTX *sctx, const SCT *sct)
175 EVP_MD_CTX *ctx = NULL;
178 if (!SCT_is_complete(sct) || sctx->pkey == NULL ||
179 sct->entry_type == CT_LOG_ENTRY_TYPE_NOT_SET ||
180 (sct->entry_type == CT_LOG_ENTRY_TYPE_PRECERT && sctx->ihash == NULL)) {
181 CTerr(CT_F_SCT_VERIFY, CT_R_SCT_NOT_SET);
184 if (sct->version != SCT_VERSION_V1) {
185 CTerr(CT_F_SCT_VERIFY, CT_R_SCT_UNSUPPORTED_VERSION);
188 if (sct->log_id_len != sctx->pkeyhashlen ||
189 memcmp(sct->log_id, sctx->pkeyhash, sctx->pkeyhashlen) != 0) {
190 CTerr(CT_F_SCT_VERIFY, CT_R_SCT_LOG_ID_MISMATCH);
194 ctx = EVP_MD_CTX_new();
198 if (!EVP_DigestVerifyInit(ctx, NULL, EVP_sha256(), NULL, sctx->pkey))
201 if (!sct_ctx_update(ctx, sctx, sct))
204 /* Verify signature */
205 ret = EVP_DigestVerifyFinal(ctx, sct->sig, sct->sig_len);
206 /* If ret < 0 some other error: fall through without setting error */
208 CTerr(CT_F_SCT_VERIFY, CT_R_SCT_INVALID_SIGNATURE);
211 EVP_MD_CTX_free(ctx);
215 int SCT_verify_v1(SCT *sct, X509 *cert, X509 *preissuer,
216 X509_PUBKEY *log_pubkey, X509 *issuer_cert)
219 SCT_CTX *sctx = NULL;
221 if (!SCT_is_complete(sct)) {
222 CTerr(CT_F_SCT_VERIFY_V1, CT_R_SCT_NOT_SET);
226 if (sct->version != 0) {
227 CTerr(CT_F_SCT_VERIFY_V1, CT_R_SCT_UNSUPPORTED_VERSION);
231 sctx = SCT_CTX_new();
235 ret = SCT_CTX_set1_pubkey(sctx, log_pubkey);
239 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);