SCT_validate.3ossl - Man Page

checks Signed Certificate Timestamps (SCTs) are valid


 #include <openssl/ct.h>

 typedef enum {
 } 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:

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.

Return Values

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.

See Also



These functions were added in OpenSSL 1.1.0.

Referenced By

ct.7ossl(7), SCT_new.3ossl(3), SCT_print.3ossl(3).

The man pages SCT_get_validation_status.3ossl(3) and SCT_LIST_validate.3ossl(3) are aliases of SCT_validate.3ossl(3).

2024-02-09 3.2.1 OpenSSL