5 SCT_new, SCT_new_from_base64, SCT_free, SCT_LIST_free,
6 SCT_get_version, SCT_set_version,
7 SCT_get_log_entry_type, SCT_set_log_entry_type,
8 SCT_get0_log_id, SCT_set0_log_id, SCT_set1_log_id,
9 SCT_get_timestamp, SCT_set_timestamp,
10 SCT_get_signature_nid, SCT_set_signature_nid,
11 SCT_get0_signature, SCT_set0_signature, SCT_set1_signature,
12 SCT_get0_extensions, SCT_set0_extensions, SCT_set1_extensions,
13 SCT_get_source, SCT_set_source
14 - A Certificate Transparency Signed Certificate Timestamp
18 #include <openssl/ct.h>
21 CT_LOG_ENTRY_TYPE_NOT_SET = -1,
22 CT_LOG_ENTRY_TYPE_X509 = 0,
23 CT_LOG_ENTRY_TYPE_PRECERT = 1
24 } ct_log_entry_type_t;
27 SCT_VERSION_NOT_SET = -1,
33 SCT_SOURCE_TLS_EXTENSION,
34 SCT_SOURCE_X509V3_EXTENSION,
35 SCT_SOURCE_OCSP_STAPLED_RESPONSE
39 SCT *SCT_new_from_base64(unsigned char version,
40 const char *logid_base64,
41 ct_log_entry_type_t entry_type,
43 const char *extensions_base64,
44 const char *signature_base64);
46 void SCT_free(SCT *sct);
47 void SCT_LIST_free(STACK_OF(SCT) *a);
49 sct_version_t SCT_get_version(const SCT *sct);
50 int SCT_set_version(SCT *sct, sct_version_t version);
52 ct_log_entry_type_t SCT_get_log_entry_type(const SCT *sct);
53 int SCT_set_log_entry_type(SCT *sct, ct_log_entry_type_t entry_type);
55 size_t SCT_get0_log_id(const SCT *sct, unsigned char **log_id);
56 int SCT_set0_log_id(SCT *sct, unsigned char *log_id, size_t log_id_len);
57 int SCT_set1_log_id(SCT *sct, const unsigned char *log_id, size_t log_id_len);
59 uint64_t SCT_get_timestamp(const SCT *sct);
60 void SCT_set_timestamp(SCT *sct, uint64_t timestamp);
62 int SCT_get_signature_nid(const SCT *sct);
63 int SCT_set_signature_nid(SCT *sct, int nid);
65 size_t SCT_get0_signature(const SCT *sct, unsigned char **sig);
66 void SCT_set0_signature(SCT *sct, unsigned char *sig, size_t sig_len);
67 int SCT_set1_signature(SCT *sct, const unsigned char *sig, size_t sig_len);
69 size_t SCT_get0_extensions(const SCT *sct, unsigned char **ext);
70 void SCT_set0_extensions(SCT *sct, unsigned char *ext, size_t ext_len);
71 int SCT_set1_extensions(SCT *sct, const unsigned char *ext, size_t ext_len);
73 sct_source_t SCT_get_source(const SCT *sct);
74 int SCT_set_source(SCT *sct, sct_source_t source);
78 Signed Certificate Timestamps (SCTs) are defined by RFC 6962, Section 3.2.
79 They constitute a promise by a Certificate Transparency (CT) log to publicly
80 record a certificate. By cryptographically verifying that a log did indeed issue
81 an SCT, some confidence can be gained that the certificate is publicly known.
83 An internal representation of an SCT can be created in one of two ways.
84 The first option is to create a blank SCT, using SCT_new(), and then populate
91 SCT_set_version() to set the SCT version.
93 Only SCT_VERSION_V1 is currently supported.
97 SCT_set_log_entry_type() to set the type of certificate the SCT was issued for:
99 B<CT_LOG_ENTRY_TYPE_X509> for a normal certificate.
100 B<CT_LOG_ENTRY_TYPE_PRECERT> for a pre-certificate.
104 SCT_set0_log_id() or SCT_set1_log_id() to set the LogID of the CT log that the SCT came from.
106 The former takes ownership, whereas the latter makes a copy.
107 See RFC 6962, Section 3.2 for the definition of LogID.
111 SCT_set_timestamp() to set the time the SCT was issued (epoch time in milliseconds).
115 SCT_set_signature_nid() to set the NID of the signature.
119 SCT_set0_signature() or SCT_set1_signature() to set the raw signature value.
121 The former takes ownership, whereas the latter makes a copy.
125 SCT_set0_extensions() or B<SCT_set1_extensions> to provide SCT extensions.
127 The former takes ownership, whereas the latter makes a copy.
131 Alternatively, the SCT can be pre-populated from the following data using
132 SCT_new_from_base64():
138 The SCT version (only SCT_VERSION_V1 is currently supported).
142 The LogID (see RFC 6962, Section 3.2), base64 encoded.
146 The type of certificate the SCT was issued for:
147 B<CT_LOG_ENTRY_TYPE_X509> for a normal certificate.
148 B<CT_LOG_ENTRY_TYPE_PRECERT> for a pre-certificate.
152 The time that the SCT was issued (epoch time in milliseconds).
156 The SCT extensions, base64 encoded.
160 The SCT signature, base64 encoded.
164 SCT_set_source() can be used to record where the SCT was found
165 (TLS extension, X.509 certificate extension or OCSP response). This is not
166 required for verifying the SCT.
170 Some of the setters return int, instead of void. These will all return 1 on
171 success, 0 on failure. They will not make changes on failure.
173 All of the setters will reset the validation status of the SCT to
174 SCT_VALIDATION_STATUS_NOT_SET (see L<SCT_validate(3)>).
176 SCT_set_source() will call SCT_set_log_entry_type() if the type of
177 certificate the SCT was issued for can be inferred from where the SCT was found.
178 For example, an SCT found in an X.509 extension must have been issued for a pre-
181 SCT_set_source() will not refuse unknown values.
185 SCT_set_version() returns 1 if the specified version is supported, 0 otherwise.
187 SCT_set_log_entry_type() returns 1 if the specified log entry type is supported, 0 otherwise.
189 SCT_set0_log_id() and B<SCT_set1_log_id> return 1 if the specified LogID is a
190 valid SHA-256 hash, 0 otherwise. Additionally, B<SCT_set1_log_id> returns 0 if
193 B<SCT_set_signature_nid> returns 1 if the specified NID is supported, 0 otherwise.
195 B<SCT_set1_extensions> and B<SCT_set1_signature> return 1 if the supplied buffer
196 is copied successfully, 0 otherwise (i.e. if malloc fails).
198 B<SCT_set_source> returns 1 on success, 0 otherwise.
208 These functions were added in OpenSSL 1.1.0.
212 Copyright 2016-2017 The OpenSSL Project Authors. All Rights Reserved.
214 Licensed under the OpenSSL license (the "License"). You may not use
215 this file except in compliance with the License. You can obtain a copy
216 in the file LICENSE in the source distribution or at
217 L<https://www.openssl.org/source/license.html>.