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Name	Size	Permission
.github	[ DIR ]	dr-xr-xr-x
CHANGELOG.md	1010 B	-r--r--r--
CONTRIBUTING.md	956 B	-r--r--r--
CONTRIBUTORS	105 B	-r--r--r--
LICENSE	1.45 KB	-r--r--r--
README.md	839 B	-r--r--r--
dce.go	2.02 KB	-r--r--r--
doc.go	407 B	-r--r--r--
go.mod	30 B	-r--r--r--
hash.go	1.71 KB	-r--r--r--
json_test.go	2.43 KB	-r--r--r--
marshal.go	907 B	-r--r--r--
node.go	2.27 KB	-r--r--r--
node_js.go	498 B	-r--r--r--
node_net.go	949 B	-r--r--r--
null.go	2.4 KB	-r--r--r--
null_test.go	4.92 KB	-r--r--r--
seq_test.go	1.41 KB	-r--r--r--
sql.go	1.42 KB	-r--r--r--
sql_test.go	2.32 KB	-r--r--r--
time.go	3.71 KB	-r--r--r--
util.go	1.88 KB	-r--r--r--
uuid.go	9.41 KB	-r--r--r--
uuid_test.go	22.11 KB	-r--r--r--
version1.go	1.23 KB	-r--r--r--
version4.go	2.01 KB	-r--r--r--
version6.go	2.16 KB	-r--r--r--
version7.go	2.54 KB	-r--r--r--

Code Editor : hash.go

// Copyright 2016 Google Inc.  All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package uuid

import (
	"crypto/md5"
	"crypto/sha1"
	"hash"
)

// Well known namespace IDs and UUIDs
var (
	NameSpaceDNS  = Must(Parse("6ba7b810-9dad-11d1-80b4-00c04fd430c8"))
	NameSpaceURL  = Must(Parse("6ba7b811-9dad-11d1-80b4-00c04fd430c8"))
	NameSpaceOID  = Must(Parse("6ba7b812-9dad-11d1-80b4-00c04fd430c8"))
	NameSpaceX500 = Must(Parse("6ba7b814-9dad-11d1-80b4-00c04fd430c8"))
	Nil           UUID // empty UUID, all zeros
)

// NewHash returns a new UUID derived from the hash of space concatenated with
// data generated by h.  The hash should be at least 16 byte in length.  The
// first 16 bytes of the hash are used to form the UUID.  The version of the
// UUID will be the lower 4 bits of version.  NewHash is used to implement
// NewMD5 and NewSHA1.
func NewHash(h hash.Hash, space UUID, data []byte, version int) UUID {
	h.Reset()
	h.Write(space[:]) //nolint:errcheck
	h.Write(data)     //nolint:errcheck
	s := h.Sum(nil)
	var uuid UUID
	copy(uuid[:], s)
	uuid[6] = (uuid[6] & 0x0f) | uint8((version&0xf)<<4)
	uuid[8] = (uuid[8] & 0x3f) | 0x80 // RFC 4122 variant
	return uuid
}

// NewMD5 returns a new MD5 (Version 3) UUID based on the
// supplied name space and data.  It is the same as calling:
//
//  NewHash(md5.New(), space, data, 3)
func NewMD5(space UUID, data []byte) UUID {
	return NewHash(md5.New(), space, data, 3)
}

// NewSHA1 returns a new SHA1 (Version 5) UUID based on the
// supplied name space and data.  It is the same as calling:
//
//  NewHash(sha1.New(), space, data, 5)
func NewSHA1(space UUID, data []byte) UUID {
	return NewHash(sha1.New(), space, data, 5)
}

${this.title}

Code Editor : hash.go