SCT_validate, SCT_LIST_validate, SCT_get_validation_status - checks Signed Certificate Timestamps (SCTs) are valid
#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);
SCT_validate()
will check that an SCT is valid and verify its signature.
SCT_LIST_validate()
performs the same checks on an entire stack of SCTs.
The result of the validation checks can be obtained by passing the SCT to
SCT_get_validation_status().
A CT_POLICY_EVAL_CTX must be provided that specifies:
The certificate the SCT was issued for.
Failure to provide the certificate will result in the validation status being SCT_VALIDATION_STATUS_UNVERIFIED.
The issuer of that certificate.
This is only required if the SCT was issued for a pre-certificate (see RFC 6962). If it is required but not provided, the validation status will be SCT_VALIDATION_STATUS_UNVERIFIED.
A CTLOG_STORE that contains the CT log that issued this SCT.
If the SCT was issued by a log that is not in this CTLOG_STORE, the validation status will be SCT_VALIDATION_STATUS_UNKNOWN_LOG.
If the SCT is of an unsupported version (only v1 is currently supported), the validation status will be SCT_VALIDATION_STATUS_UNKNOWN_VERSION.
If the SCT's signature is incorrect, its timestamp is in the future (relative to the time in CT_POLICY_EVAL_CTX), or if it is otherwise invalid, the validation status will be SCT_VALIDATION_STATUS_INVALID.
If all checks pass, the validation status will be SCT_VALIDATION_STATUS_VALID.
A return value of 0 from SCT_LIST_validate()
should not be interpreted as a
failure. At a minimum, only one valid SCT may provide sufficient confidence
that a certificate has been publicly logged.
SCT_validate()
returns a negative integer if an internal error occurs, 0 if the
SCT fails validation, or 1 if the SCT passes validation.
SCT_LIST_validate()
returns a negative integer if an internal error occurs, 0
if any of SCTs fails validation, or 1 if they all pass validation.
SCT_get_validation_status()
returns the validation status of the SCT.
If SCT_validate()
or SCT_LIST_validate()
have not been passed that SCT, the
returned value will be SCT_VALIDATION_STATUS_NOT_SET.
ct(7)
These functions were added in OpenSSL 1.1.0.
Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the OpenSSL license (the ``License''). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at https://www.openssl.org/source/license.html.