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Side by Side Diff: openpgp/packet/literal.go

Issue 5564059: code review 5564059: go.crypto: initial code (Closed)
Patch Set: diff -r b50a7fb49394 https://code.google.com/p/go.crypto Created 12 years, 2 months ago
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1 // Copyright 2011 The Go Authors. 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.
4
5 package packet
6
7 import (
8 "encoding/binary"
9 "io"
10 )
11
12 // LiteralData represents an encrypted file. See RFC 4880, section 5.9.
13 type LiteralData struct {
14 IsBinary bool
15 FileName string
16 Time uint32 // Unix epoch time. Either creation time or modification time. 0 means undefined.
17 Body io.Reader
18 }
19
20 // ForEyesOnly returns whether the contents of the LiteralData have been marked
21 // as especially sensitive.
22 func (l *LiteralData) ForEyesOnly() bool {
23 return l.FileName == "_CONSOLE"
24 }
25
26 func (l *LiteralData) parse(r io.Reader) (err error) {
27 var buf [256]byte
28
29 _, err = readFull(r, buf[:2])
30 if err != nil {
31 return
32 }
33
34 l.IsBinary = buf[0] == 'b'
35 fileNameLen := int(buf[1])
36
37 _, err = readFull(r, buf[:fileNameLen])
38 if err != nil {
39 return
40 }
41
42 l.FileName = string(buf[:fileNameLen])
43
44 _, err = readFull(r, buf[:4])
45 if err != nil {
46 return
47 }
48
49 l.Time = binary.BigEndian.Uint32(buf[:4])
50 l.Body = r
51 return
52 }
53
54 // SerializeLiteral serializes a literal data packet to w and returns a
55 // WriteCloser to which the data itself can be written and which MUST be closed
56 // on completion. The fileName is truncated to 255 bytes.
57 func SerializeLiteral(w io.WriteCloser, isBinary bool, fileName string, time uin t32) (plaintext io.WriteCloser, err error) {
58 var buf [4]byte
59 buf[0] = 't'
60 if isBinary {
61 buf[0] = 'b'
62 }
63 if len(fileName) > 255 {
64 fileName = fileName[:255]
65 }
66 buf[1] = byte(len(fileName))
67
68 inner, err := serializeStreamHeader(w, packetTypeLiteralData)
69 if err != nil {
70 return
71 }
72
73 _, err = inner.Write(buf[:2])
74 if err != nil {
75 return
76 }
77 _, err = inner.Write([]byte(fileName))
78 if err != nil {
79 return
80 }
81 binary.BigEndian.PutUint32(buf[:], time)
82 _, err = inner.Write(buf[:])
83 if err != nil {
84 return
85 }
86
87 plaintext = inner
88 return
89 }
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