Add support for RFC 7914 (#77)

1 files changed, 49 insertions, 0 deletions

diff --git a/pyasn1_modules/rfc7914.py b/pyasn1_modules/rfc7914.py
new file mode 100644
index 0000000..99e9551
--- /dev/null
+++ b/pyasn1_modules/rfc7914.py
@@ -0,0 +1,49 @@
+#
+# This file is part of pyasn1-modules software.
+#
+# Created by Russ Housley with assistance from asn1ate v.0.6.0.
+#
+# Copyright (c) 2019, Vigil Security, LLC
+# License: http://snmplabs.com/pyasn1/license.html
+#
+#The scrypt Password-Based Key Derivation Function
+#
+# ASN.1 source from:
+# https://www.rfc-editor.org/rfc/rfc8520.txt
+# https://www.rfc-editor.org/errata/eid5871
+#
+
+from pyasn1.type import constraint
+from pyasn1.type import namedtype
+from pyasn1.type import univ
+
+from pyasn1_modules import rfc5280
+
+MAX = float('inf')
+
+
+id_scrypt = univ.ObjectIdentifier('1.3.6.1.4.1.11591.4.11')
+
+
+class Scrypt_params(univ.Sequence):
+    componentType = namedtype.NamedTypes(
+        namedtype.NamedType('salt',
+            univ.OctetString()),
+        namedtype.NamedType('costParameter',
+            univ.Integer().subtype(subtypeSpec=constraint.ValueRangeConstraint(1, MAX))),
+        namedtype.NamedType('blockSize',
+            univ.Integer().subtype(subtypeSpec=constraint.ValueRangeConstraint(1, MAX))),
+        namedtype.NamedType('parallelizationParameter',
+            univ.Integer().subtype(subtypeSpec=constraint.ValueRangeConstraint(1, MAX))),
+        namedtype.OptionalNamedType('keyLength',
+            univ.Integer().subtype(subtypeSpec=constraint.ValueRangeConstraint(1, MAX)))
+    )
+
+
+# Update the Algorithm Identifier map in rfc5280.py
+
+_algorithmIdentifierMapUpdate = {
+    id_scrypt: Scrypt_params(),
+}
+
+rfc5280.algorithmIdentifierMap.update(_algorithmIdentifierMapUpdate)