Documents the SCT validation functions

=head1 NAME

=head1 NAME

SCT_validate, SCT_LIST_validate, SCT_get_validation_status -

SCT_validate, SCT_LIST_validate, SCT_get_validation_status -

checks Signed Certificate Timestamps meet a Certificate Transparency policy

checks Signed Certificate Timestamps (SCTs) are valid

=head1 SYNOPSIS

=head1 SYNOPSIS

  SCT_VALIDATION_STATUS_UNKNOWN_VERSION

  SCT_VALIDATION_STATUS_UNKNOWN_VERSION

 } sct_validation_status_t;

 } sct_validation_status_t;

 sct_validation_status_t SCT_get_validation_status(const SCT *sct);

 int SCT_validate(SCT *sct, const CT_POLICY_EVAL_CTX *ctx);

 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);

 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);

=head1 DESCRIPTION

=head1 DESCRIPTION

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:

=head1 NOTES

=over

=item * The certificate the SCT was issued for.

Failure to provide the certificate will result in the validation status being

SCT_VALIDATION_STATUS_UNVERIFIED.

=item * 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.

=item * 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.

=back

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, the validation status will be

SCT_VALIDATION_STATUS_INVALID. Otherwise, if all checks have passed, the

validation status will be SCT_VALIDATION_STATUS_VALID.

=head1 NOTES

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.

=head1 RETURN VALUES

=head1 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.

=head1 SEE ALSO

=head1 SEE ALSO