1 files changed, 104 insertions, 0 deletions
diff --git a/crypto/openssl/doc/man3/SCT_validate.pod b/crypto/openssl/doc/man3/SCT_validate.pod
new file mode 100644
index 000000000000..fa7e2a8ba2cc
--- /dev/null
+++ b/crypto/openssl/doc/man3/SCT_validate.pod
@@ -0,0 +1,104 @@
+=pod
+
+=head1 NAME
+
+SCT_validate, SCT_LIST_validate, SCT_get_validation_status -
+checks Signed Certificate Timestamps (SCTs) are valid
+
+=head1 SYNOPSIS
+
+ #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);
+
+=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:
+
+=over 2
+
+=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, 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.
+
+=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
+
+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
+
+L<ct(7)>
+
+=head1 HISTORY
+
+These functions were added in OpenSSL 1.1.0.
+
+=head1 COPYRIGHT
+
+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
+L<https://www.openssl.org/source/license.html>.
+
+=cut