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.\" ========================================================================
.\"
.IX Title "SCT_VALIDATE 3"
.TH SCT_VALIDATE 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
SCT_validate, SCT_LIST_validate, SCT_get_validation_status \- checks Signed Certificate Timestamps (SCTs) are valid
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/ct.h>
\&
\& typedef enum {
\&     SCT_VALIDATION_STATUS_NOT_SET,
\&     SCT_VALIDATION_STATUS_UNKNOWN_LOG,
\&     SCT_VALIDATION_STATUS_VALID,
\&     SCT_VALIDATION_STATUS_INVALID,
\&     SCT_VALIDATION_STATUS_UNVERIFIED,
\&     SCT_VALIDATION_STATUS_UNKNOWN_VERSION
\& } sct_validation_status_t;
\&
\& int SCT_validate(SCT *sct, const CT_POLICY_EVAL_CTX *ctx);
\& int SCT_LIST_validate(const STACK_OF(SCT) *scts, CT_POLICY_EVAL_CTX *ctx);
\& sct_validation_status_t SCT_get_validation_status(const SCT *sct);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fISCT_validate()\fR will check that an \s-1SCT\s0 is valid and verify its signature.
\&\fISCT_LIST_validate()\fR performs the same checks on an entire stack of SCTs.
The result of the validation checks can be obtained by passing the \s-1SCT\s0 to
\&\fISCT_get_validation_status()\fR.
.PP
A \s-1CT_POLICY_EVAL_CTX\s0 must be provided that specifies:
.IP "\(bu" 2
The certificate the \s-1SCT\s0 was issued for.
.Sp
Failure to provide the certificate will result in the validation status being
\&\s-1SCT_VALIDATION_STATUS_UNVERIFIED.\s0
.IP "\(bu" 2
The issuer of that certificate.
.Sp
This is only required if the \s-1SCT\s0 was issued for a pre-certificate
(see \s-1RFC 6962\s0). If it is required but not provided, the validation status will
be \s-1SCT_VALIDATION_STATUS_UNVERIFIED.\s0
.IP "\(bu" 2
A \s-1CTLOG_STORE\s0 that contains the \s-1CT\s0 log that issued this \s-1SCT.\s0
.Sp
If the \s-1SCT\s0 was issued by a log that is not in this \s-1CTLOG_STORE,\s0 the validation
status will be \s-1SCT_VALIDATION_STATUS_UNKNOWN_LOG.\s0
.PP
If the \s-1SCT\s0 is of an unsupported version (only v1 is currently supported), the
validation status will be \s-1SCT_VALIDATION_STATUS_UNKNOWN_VERSION.\s0
.PP
If the \s-1SCT\s0's signature is incorrect, its timestamp is in the future (relative to
the time in \s-1CT_POLICY_EVAL_CTX\s0), or if it is otherwise invalid, the validation
status will be \s-1SCT_VALIDATION_STATUS_INVALID.\s0
.PP
If all checks pass, the validation status will be \s-1SCT_VALIDATION_STATUS_VALID.\s0
.SH "NOTES"
.IX Header "NOTES"
A return value of 0 from \fISCT_LIST_validate()\fR should not be interpreted as a
failure. At a minimum, only one valid \s-1SCT\s0 may provide sufficient confidence
that a certificate has been publicly logged.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fISCT_validate()\fR returns a negative integer if an internal error occurs, 0 if the
\&\s-1SCT\s0 fails validation, or 1 if the \s-1SCT\s0 passes validation.
.PP
\&\fISCT_LIST_validate()\fR returns a negative integer if an internal error occurs, 0
if any of SCTs fails validation, or 1 if they all pass validation.
.PP
\&\fISCT_get_validation_status()\fR returns the validation status of the \s-1SCT.\s0
If \fISCT_validate()\fR or \fISCT_LIST_validate()\fR have not been passed that \s-1SCT,\s0 the
returned value will be \s-1SCT_VALIDATION_STATUS_NOT_SET.\s0
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIct\fR\|(7)
.SH "HISTORY"
.IX Header "HISTORY"
These functions were added in OpenSSL 1.1.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2016 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>.

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