ducky/devices
2015-11-15
Parent:b6494e1a499e
ducky/devices/vendor/code.google.com/p/go-uuid/uuid/hash.go
Ignore coverage output. Add a .hgignore file to ignore the output file that tracks our test coverage.
| paddy@0 | 1 // Copyright 2011 Google Inc. All rights reserved. |
| paddy@0 | 2 // Use of this source code is governed by a BSD-style |
| paddy@0 | 3 // license that can be found in the LICENSE file. |
| paddy@0 | 4 |
| paddy@0 | 5 package uuid |
| paddy@0 | 6 |
| paddy@0 | 7 import ( |
| paddy@0 | 8 "crypto/md5" |
| paddy@0 | 9 "crypto/sha1" |
| paddy@0 | 10 "hash" |
| paddy@0 | 11 ) |
| paddy@0 | 12 |
| paddy@0 | 13 // Well known Name Space IDs and UUIDs |
| paddy@0 | 14 var ( |
| paddy@0 | 15 NameSpace_DNS = Parse("6ba7b810-9dad-11d1-80b4-00c04fd430c8") |
| paddy@0 | 16 NameSpace_URL = Parse("6ba7b811-9dad-11d1-80b4-00c04fd430c8") |
| paddy@0 | 17 NameSpace_OID = Parse("6ba7b812-9dad-11d1-80b4-00c04fd430c8") |
| paddy@0 | 18 NameSpace_X500 = Parse("6ba7b814-9dad-11d1-80b4-00c04fd430c8") |
| paddy@0 | 19 NIL = Parse("00000000-0000-0000-0000-000000000000") |
| paddy@0 | 20 ) |
| paddy@0 | 21 |
| paddy@0 | 22 // NewHash returns a new UUID dervied from the hash of space concatenated with |
| paddy@0 | 23 // data generated by h. The hash should be at least 16 byte in length. The |
| paddy@0 | 24 // first 16 bytes of the hash are used to form the UUID. The version of the |
| paddy@0 | 25 // UUID will be the lower 4 bits of version. NewHash is used to implement |
| paddy@0 | 26 // NewMD5 and NewSHA1. |
| paddy@0 | 27 func NewHash(h hash.Hash, space UUID, data []byte, version int) UUID { |
| paddy@0 | 28 h.Reset() |
| paddy@0 | 29 h.Write(space) |
| paddy@0 | 30 h.Write([]byte(data)) |
| paddy@0 | 31 s := h.Sum(nil) |
| paddy@0 | 32 uuid := make([]byte, 16) |
| paddy@0 | 33 copy(uuid, s) |
| paddy@0 | 34 uuid[6] = (uuid[6] & 0x0f) | uint8((version&0xf)<<4) |
| paddy@0 | 35 uuid[8] = (uuid[8] & 0x3f) | 0x80 // RFC 4122 variant |
| paddy@0 | 36 return uuid |
| paddy@0 | 37 } |
| paddy@0 | 38 |
| paddy@0 | 39 // NewMD5 returns a new MD5 (Version 3) UUID based on the |
| paddy@0 | 40 // supplied name space and data. |
| paddy@0 | 41 // |
| paddy@0 | 42 // NewHash(md5.New(), space, data, 3) |
| paddy@0 | 43 func NewMD5(space UUID, data []byte) UUID { |
| paddy@0 | 44 return NewHash(md5.New(), space, data, 3) |
| paddy@0 | 45 } |
| paddy@0 | 46 |
| paddy@0 | 47 // NewSHA1 returns a new SHA1 (Version 5) UUID based on the |
| paddy@0 | 48 // supplied name space and data. |
| paddy@0 | 49 // |
| paddy@0 | 50 // NewHash(sha1.New(), space, data, 5) |
| paddy@0 | 51 func NewSHA1(space UUID, data []byte) UUID { |
| paddy@0 | 52 return NewHash(sha1.New(), space, data, 5) |
| paddy@0 | 53 } |