Module: CyberplatPKI::DocumentIORoutines

Defined in:
lib/cyberplat_pki/document_io_routines.rb

Instance Method Summary collapse

Instance Method Details

#read_block(header, trailer, data_size) ⇒ Object 



23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
 
# File 'lib/cyberplat_pki/document_io_routines.rb', line 23

def read_block(header, trailer, data_size)
  line = readline_crlf
  raise "CyberplatPKI: CRYPT_ERR_INVALID_FORMAT (unexpected header '#{line}', expecting '#{header}')" if line != header

  data_start = pos
  seek data_size, IO::SEEK_CUR

  line = readline_crlf
  raise "CyberplatPKI: CRYPT_ERR_INVALID_FORMAT (unexpected trailer '#{line}', expecting '')" if line != ''

  line = readline_crlf
  raise "CyberplatPKI: CRYPT_ERR_INVALID_FORMAT (unexpected trailer '#{line}', expecting '#{trailer}')" if line != trailer

  block_end = tell

  seek data_start
  data = read data_size
  seek block_end

  data
end

#read_document ⇒ Object 



49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
 
# File 'lib/cyberplat_pki/document_io_routines.rb', line 49

def read_document
  document_start = pos

  header = readline_crlf

  raise "CyberplatPKI: CRYPT_ERR_INVALID_FORMAT (invalid document header: '#{header}'. Expecting 36 characters, got #{header.length})" unless header.length == 36

  doc = Document.new

  length            = cut_int header, 0...8      # Length of following data (e.g. document length - 8)
  doc.engine        = cut_int header, 8...10     # Engine ID
  doc.type          = header[10...12].to_sym     # Document type
  body_block        = cut_int header, 12...20    # Body block size
  doc.data_length   = cut_int header, 20...28    # Length of body in signatures
  signature_block   = cut_int header, 28...36    # Signature block size

  doc.subject       = read_key_id
  doc.ca            = read_key_id

  doc.body           = read_block 'BEGIN', 'END', body_block
  doc.signature      = read_block 'BEGIN SIGNATURE', 'END SIGNATURE', signature_block

  seek document_start + 8 + length + 2

  doc
end

#read_key_id ⇒ Object 



11
12
13
14
15
16
17
 
# File 'lib/cyberplat_pki/document_io_routines.rb', line 11

def read_key_id
  line = readline_crlf

  raise "CyberplatPKI: CRYPT_ERR_INVALID_FORMAT (invalid key ID line: '#{line}'. Expecting 28 characters, got #{line.length})" unless line.length == 28

  KeyId.new line[0...20].rstrip!, cut_int(line, 20...28)
end

#readline_crlf ⇒ Object 



3
4
5
6
7
8
9
 
# File 'lib/cyberplat_pki/document_io_routines.rb', line 3

def readline_crlf
  line = readline "\r\n"

  line.sub! /\r\n$/, ''

  line
end

#write_block(header, trailer, data) ⇒ Object 



45
46
47
 
# File 'lib/cyberplat_pki/document_io_routines.rb', line 45

def write_block(header, trailer, data)
  write "#{header}\r\n#{data}\r\n#{trailer}\r\n"
end

#write_document(doc) ⇒ Object 



76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
 
# File 'lib/cyberplat_pki/document_io_routines.rb', line 76

def write_document(doc)
  start_pos = pos

  printf "XXXXXXXX%02d%s%08d%08d%08d\r\n", doc.engine, doc.type.to_s, doc.body.length, doc.data_length, doc.signature.length
  write_key_id doc.subject
  write_key_id doc.ca

  write_block 'BEGIN', 'END', doc.body
  write_block 'BEGIN SIGNATURE', 'END SIGNATURE', doc.signature

  end_pos = pos
  seek start_pos
  printf "%08d", end_pos - start_pos - 10
  seek end_pos
end

#write_key_id(key_id) ⇒ Object 



19
20
21
 
# File 'lib/cyberplat_pki/document_io_routines.rb', line 19

def write_key_id(key_id)
  printf "%-20s%08d\r\n", key_id.key_name, key_id.key_serial
end