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.\" ========================================================================
.\"
.IX Title "SCT_NEW 3"
.TH SCT_NEW 3 "2021-08-24" "1.1.1l" "OpenSSL"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
SCT_new, SCT_new_from_base64, SCT_free, SCT_LIST_free, SCT_get_version, SCT_set_version, SCT_get_log_entry_type, SCT_set_log_entry_type, SCT_get0_log_id, SCT_set0_log_id, SCT_set1_log_id, SCT_get_timestamp, SCT_set_timestamp, SCT_get_signature_nid, SCT_set_signature_nid, SCT_get0_signature, SCT_set0_signature, SCT_set1_signature, SCT_get0_extensions, SCT_set0_extensions, SCT_set1_extensions, SCT_get_source, SCT_set_source \&\- A Certificate Transparency Signed Certificate Timestamp
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/ct.h>
\&
\& typedef enum {
\& CT_LOG_ENTRY_TYPE_NOT_SET = \-1,
\& CT_LOG_ENTRY_TYPE_X509 = 0,
\& CT_LOG_ENTRY_TYPE_PRECERT = 1
\& } ct_log_entry_type_t;
\&
\& typedef enum {
\& SCT_VERSION_NOT_SET = \-1,
\& SCT_VERSION_V1 = 0
\& } sct_version_t;
\&
\& typedef enum {
\& SCT_SOURCE_UNKNOWN,
\& SCT_SOURCE_TLS_EXTENSION,
\& SCT_SOURCE_X509V3_EXTENSION,
\& SCT_SOURCE_OCSP_STAPLED_RESPONSE
\& } sct_source_t;
\&
\& SCT *SCT_new(void);
\& SCT *SCT_new_from_base64(unsigned char version,
\& const char *logid_base64,
\& ct_log_entry_type_t entry_type,
\& uint64_t timestamp,
\& const char *extensions_base64,
\& const char *signature_base64);
\&
\& void SCT_free(SCT *sct);
\& void SCT_LIST_free(STACK_OF(SCT) *a);
\&
\& sct_version_t SCT_get_version(const SCT *sct);
\& int SCT_set_version(SCT *sct, sct_version_t version);
\&
\& ct_log_entry_type_t SCT_get_log_entry_type(const SCT *sct);
\& int SCT_set_log_entry_type(SCT *sct, ct_log_entry_type_t entry_type);
\&
\& size_t SCT_get0_log_id(const SCT *sct, unsigned char **log_id);
\& int SCT_set0_log_id(SCT *sct, unsigned char *log_id, size_t log_id_len);
\& int SCT_set1_log_id(SCT *sct, const unsigned char *log_id, size_t log_id_len);
\&
\& uint64_t SCT_get_timestamp(const SCT *sct);
\& void SCT_set_timestamp(SCT *sct, uint64_t timestamp);
\&
\& int SCT_get_signature_nid(const SCT *sct);
\& int SCT_set_signature_nid(SCT *sct, int nid);
\&
\& size_t SCT_get0_signature(const SCT *sct, unsigned char **sig);
\& void SCT_set0_signature(SCT *sct, unsigned char *sig, size_t sig_len);
\& int SCT_set1_signature(SCT *sct, const unsigned char *sig, size_t sig_len);
\&
\& size_t SCT_get0_extensions(const SCT *sct, unsigned char **ext);
\& void SCT_set0_extensions(SCT *sct, unsigned char *ext, size_t ext_len);
\& int SCT_set1_extensions(SCT *sct, const unsigned char *ext, size_t ext_len);
\&
\& sct_source_t SCT_get_source(const SCT *sct);
\& int SCT_set_source(SCT *sct, sct_source_t source);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Signed Certificate Timestamps (SCTs) are defined by \s-1RFC\s0 6962, Section 3.2.
They constitute a promise by a Certificate Transparency (\s-1CT\s0) log to publicly
record a certificate. By cryptographically verifying that a log did indeed issue
an \s-1SCT\s0, some confidence can be gained that the certificate is publicly known.
.PP
An internal representation of an \s-1SCT\s0 can be created in one of two ways.
The first option is to create a blank \s-1SCT\s0, using \fISCT_new()\fR, and then populate
it using:
.IP "\(bu" 2
\&\fISCT_set_version()\fR to set the \s-1SCT\s0 version.
.Sp
Only \s-1SCT_VERSION_V1\s0 is currently supported.
.IP "\(bu" 2
\&\fISCT_set_log_entry_type()\fR to set the type of certificate the \s-1SCT\s0 was issued for:
.Sp
\&\fB\s-1CT_LOG_ENTRY_TYPE_X509\s0\fR for a normal certificate.
\&\fB\s-1CT_LOG_ENTRY_TYPE_PRECERT\s0\fR for a pre-certificate.
.IP "\(bu" 2
\&\fISCT_set0_log_id()\fR or \fISCT_set1_log_id()\fR to set the LogID of the \s-1CT\s0 log that the \s-1SCT\s0 came from.
.Sp
The former takes ownership, whereas the latter makes a copy.
See \s-1RFC\s0 6962, Section 3.2 for the definition of LogID.
.IP "\(bu" 2
\&\fISCT_set_timestamp()\fR to set the time the \s-1SCT\s0 was issued (epoch time in milliseconds).
.IP "\(bu" 2
\&\fISCT_set_signature_nid()\fR to set the \s-1NID\s0 of the signature.
.IP "\(bu" 2
\&\fISCT_set0_signature()\fR or \fISCT_set1_signature()\fR to set the raw signature value.
.Sp
The former takes ownership, whereas the latter makes a copy.
.IP "\(bu" 2
\&\fISCT_set0_extensions()\fR or \fBSCT_set1_extensions\fR to provide \s-1SCT\s0 extensions.
.Sp
The former takes ownership, whereas the latter makes a copy.
.PP
Alternatively, the \s-1SCT\s0 can be pre-populated from the following data using
\&\fISCT_new_from_base64()\fR:
.IP "\(bu" 2
The \s-1SCT\s0 version (only \s-1SCT_VERSION_V1\s0 is currently supported).
.IP "\(bu" 2
The LogID (see \s-1RFC\s0 6962, Section 3.2), base64 encoded.
.IP "\(bu" 2
The type of certificate the \s-1SCT\s0 was issued for:
\&\fB\s-1CT_LOG_ENTRY_TYPE_X509\s0\fR for a normal certificate.
\&\fB\s-1CT_LOG_ENTRY_TYPE_PRECERT\s0\fR for a pre-certificate.
.IP "\(bu" 2
The time that the \s-1SCT\s0 was issued (epoch time in milliseconds).
.IP "\(bu" 2
The \s-1SCT\s0 extensions, base64 encoded.
.IP "\(bu" 2
The \s-1SCT\s0 signature, base64 encoded.
.PP
\&\fISCT_set_source()\fR can be used to record where the \s-1SCT\s0 was found
(\s-1TLS\s0 extension, X.509 certificate extension or \s-1OCSP\s0 response). This is not
required for verifying the \s-1SCT\s0.
.SH "NOTES"
.IX Header "NOTES"
Some of the setters return int, instead of void. These will all return 1 on
success, 0 on failure. They will not make changes on failure.
.PP
All of the setters will reset the validation status of the \s-1SCT\s0 to
\&\s-1SCT_VALIDATION_STATUS_NOT_SET\s0 (see \fISCT_validate\fR\|(3)).
.PP
\&\fISCT_set_source()\fR will call \fISCT_set_log_entry_type()\fR if the type of
certificate the \s-1SCT\s0 was issued for can be inferred from where the \s-1SCT\s0 was found.
For example, an \s-1SCT\s0 found in an X.509 extension must have been issued for a pre\-
certificate.
.PP
\&\fISCT_set_source()\fR will not refuse unknown values.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fISCT_set_version()\fR returns 1 if the specified version is supported, 0 otherwise.
.PP
\&\fISCT_set_log_entry_type()\fR returns 1 if the specified log entry type is supported, 0 otherwise.
.PP
\&\fISCT_set0_log_id()\fR and \fBSCT_set1_log_id\fR return 1 if the specified LogID is a
valid \s-1SHA\-256\s0 hash, 0 otherwise. Additionally, \fBSCT_set1_log_id\fR returns 0 if
malloc fails.
.PP
\&\fBSCT_set_signature_nid\fR returns 1 if the specified \s-1NID\s0 is supported, 0 otherwise.
.PP
\&\fBSCT_set1_extensions\fR and \fBSCT_set1_signature\fR return 1 if the supplied buffer
is copied successfully, 0 otherwise (i.e. if malloc fails).
.PP
\&\fBSCT_set_source\fR returns 1 on success, 0 otherwise.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIct\fR\|(7),
\&\fISCT_validate\fR\|(3),
\&\fIOBJ_nid2obj\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
These functions were added in OpenSSL 1.1.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2016\-2017 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.
Copyright 2K16 - 2K18 Indonesian Hacker Rulez
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