ducky/devices
2015-11-27
Parent:b6494e1a499e
ducky/devices/vendor/code.google.com/p/go-uuid/uuid/hash.go
Implement and test updating devices, and reuse contexts. Update all our tests to use the same context.Context instance within each test case, so static analysis about how we're passing contexts around dosn't get tripped up. Also, write a test that will check to make sure that our Storer implementations all actually update the Device correctly. We create every possible permutation of a DeviceChange, just to make sure they all work.
1 // Copyright 2011 Google Inc. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
5 package uuid
7 import (
8 "crypto/md5"
9 "crypto/sha1"
10 "hash"
11 )
13 // Well known Name Space IDs and UUIDs
14 var (
15 NameSpace_DNS = Parse("6ba7b810-9dad-11d1-80b4-00c04fd430c8")
16 NameSpace_URL = Parse("6ba7b811-9dad-11d1-80b4-00c04fd430c8")
17 NameSpace_OID = Parse("6ba7b812-9dad-11d1-80b4-00c04fd430c8")
18 NameSpace_X500 = Parse("6ba7b814-9dad-11d1-80b4-00c04fd430c8")
19 NIL = Parse("00000000-0000-0000-0000-000000000000")
20 )
22 // NewHash returns a new UUID dervied from the hash of space concatenated with
23 // data generated by h. The hash should be at least 16 byte in length. The
24 // first 16 bytes of the hash are used to form the UUID. The version of the
25 // UUID will be the lower 4 bits of version. NewHash is used to implement
26 // NewMD5 and NewSHA1.
27 func NewHash(h hash.Hash, space UUID, data []byte, version int) UUID {
28 h.Reset()
29 h.Write(space)
30 h.Write([]byte(data))
31 s := h.Sum(nil)
32 uuid := make([]byte, 16)
33 copy(uuid, s)
34 uuid[6] = (uuid[6] & 0x0f) | uint8((version&0xf)<<4)
35 uuid[8] = (uuid[8] & 0x3f) | 0x80 // RFC 4122 variant
36 return uuid
37 }
39 // NewMD5 returns a new MD5 (Version 3) UUID based on the
40 // supplied name space and data.
41 //
42 // NewHash(md5.New(), space, data, 3)
43 func NewMD5(space UUID, data []byte) UUID {
44 return NewHash(md5.New(), space, data, 3)
45 }
47 // NewSHA1 returns a new SHA1 (Version 5) UUID based on the
48 // supplied name space and data.
49 //
50 // NewHash(sha1.New(), space, data, 5)
51 func NewSHA1(space UUID, data []byte) UUID {
52 return NewHash(sha1.New(), space, data, 5)
53 }