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-rw-r--r--docs/x509/reference.rst44
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diff --git a/docs/x509/reference.rst b/docs/x509/reference.rst
index 8bb3f40d..529578ba 100644
--- a/docs/x509/reference.rst
+++ b/docs/x509/reference.rst
@@ -1860,6 +1860,44 @@ X.509 Extensions
:type: int
+.. class:: PolicyConstraints
+
+ .. versionadded:: 1.3
+
+ The policy constraints extension is used to inhibit policy mapping or
+ require that each certificate in a chain contain an acceptable policy
+ identifier. For more information about the use of this extension see
+ :rfc:`5280`.
+
+ .. attribute:: oid
+
+ :type: :class:`ObjectIdentifier`
+
+ Returns :attr:`~cryptography.x509.oid.ExtensionOID.POLICY_CONSTRAINTS`.
+
+ .. attribute:: require_explicit_policy
+
+ :type: int or None
+
+ If this field is not None, the value indicates the number of additional
+ certificates that may appear in the chain before an explicit policy is
+ required for the entire path. When an explicit policy is required, it
+ is necessary for all certificates in the chain to contain an acceptable
+ policy identifier in the certificate policies extension. An
+ acceptable policy identifier is the identifier of a policy required
+ by the user of the certification path or the identifier of a policy
+ that has been declared equivalent through policy mapping.
+
+ .. attribute:: inhibit_policy_mapping
+
+ :type: int or None
+
+ If this field is not None, the value indicates the number of additional
+ certificates that may appear in the chain before policy mapping is no
+ longer permitted. For example, a value of one indicates that policy
+ mapping may be processed in certificates issued by the subject of this
+ certificate, but not in additional certificates in the chain.
+
.. class:: CRLNumber(crl_number)
.. versionadded:: 1.2
@@ -2392,6 +2430,12 @@ instances. The following common OIDs are available as constants.
the ``CRLNumber`` extension type. This extension only has meaning
for certificate revocation lists.
+ .. attribute:: POLICY_CONSTRAINTS
+
+ Corresponds to the dotted string ``"2.5.29.36"``. The identifier for the
+ :class:`~cryptography.x509.PolicyConstraints` extension type.
+
+
.. class:: CRLEntryExtensionOID
.. versionadded:: 1.2