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+module iana-crypt-hash {
+  namespace "urn:ietf:params:xml:ns:yang:iana-crypt-hash";
+  prefix ianach;
+
+  organization "IANA";
+  contact
+    "        Internet Assigned Numbers Authority
+
+     Postal: ICANN
+             12025 Waterfront Drive, Suite 300
+             Los Angeles, CA  90094-2536
+             United States
+
+     Tel:    +1 310 301 5800
+     E-Mail: iana@iana.org>";
+  description
+    "This YANG module defines a type for storing passwords
+     using a hash function and features to indicate which hash
+     functions are supported by an implementation.
+
+     The latest revision of this YANG module can be obtained from
+     the IANA web site.
+
+     Requests for new values should be made to IANA via
+     email (iana@iana.org).
+
+     Copyright (c) 2014 IETF Trust and the persons identified as
+     authors of the code.  All rights reserved.
+
+     Redistribution and use in source and binary forms, with or
+     without modification, is permitted pursuant to, and subject
+     to the license terms contained in, the Simplified BSD License
+     set forth in Section 4.c of the IETF Trust's Legal Provisions
+     Relating to IETF Documents
+     (http://trustee.ietf.org/license-info).
+
+     The initial version of this YANG module is part of RFC 7317;
+     see the RFC itself for full legal notices.";
+
+  revision 2014-08-06 {
+    description
+      "Initial revision.";
+    reference
+      "RFC 7317: A YANG Data Model for System Management";
+  }
+
+  typedef crypt-hash {
+    type string {
+      pattern
+        '$0$.*'
+      + '|$1$[a-zA-Z0-9./]{1,8}$[a-zA-Z0-9./]{22}'
+      + '|$5$(rounds=\d+$)?[a-zA-Z0-9./]{1,16}$[a-zA-Z0-9./]{43}'
+      + '|$6$(rounds=\d+$)?[a-zA-Z0-9./]{1,16}$[a-zA-Z0-9./]{86}';
+    }
+    description
+      "The crypt-hash type is used to store passwords using
+       a hash function.  The algorithms for applying the hash
+       function and encoding the result are implemented in
+       various UNIX systems as the function crypt(3).
+
+       A value of this type matches one of the forms:
+
+         $0$<clear text password>
+         $<id>$<salt>$<password hash>
+         $<id>$<parameter>$<salt>$<password hash>
+
+       The '$0$' prefix signals that the value is clear text.  When
+       such a value is received by the server, a hash value is
+       calculated, and the string '$<id>$<salt>$' or
+       $<id>$<parameter>$<salt>$ is prepended to the result.  This
+       value is stored in the configuration data store.
+       If a value starting with '$<id>$', where <id> is not '0', is
+       received, the server knows that the value already represents a
+       hashed value and stores it 'as is' in the data store.
+
+       When a server needs to verify a password given by a user, it
+       finds the stored password hash string for that user, extracts
+       the salt, and calculates the hash with the salt and given
+       password as input.  If the calculated hash value is the same
+       as the stored value, the password given by the client is
+       accepted.
+
+       This type defines the following hash functions:
+
+         id | hash function | feature
+         ---+---------------+-------------------
+          1 | MD5           | crypt-hash-md5
+          5 | SHA-256       | crypt-hash-sha-256
+          6 | SHA-512       | crypt-hash-sha-512
+
+       The server indicates support for the different hash functions
+       by advertising the corresponding feature.";
+    reference
+      "IEEE Std 1003.1-2008 - crypt() function
+       RFC 1321: The MD5 Message-Digest Algorithm
+       FIPS.180-4.2012: Secure Hash Standard (SHS)";
+  }
+
+  feature crypt-hash-md5 {
+    description
+      "Indicates that the device supports the MD5
+       hash function in 'crypt-hash' values.";
+    reference "RFC 1321: The MD5 Message-Digest Algorithm";
+  }
+
+  feature crypt-hash-sha-256 {
+    description
+      "Indicates that the device supports the SHA-256
+       hash function in 'crypt-hash' values.";
+    reference "FIPS.180-4.2012: Secure Hash Standard (SHS)";
+  }
+
+  feature crypt-hash-sha-512 {
+    description
+      "Indicates that the device supports the SHA-512
+       hash function in 'crypt-hash' values.";
+    reference "FIPS.180-4.2012: Secure Hash Standard (SHS)";
+  }
+
+}