| Filename | /home/micha/Projekt/spreadsheet-parsexlsx/lib/Spreadsheet/ParseXLSX/Decryptor/Agile.pm |
| Statements | Executed 7 statements in 371µs |
| Calls | P | F | Exclusive Time |
Inclusive Time |
Subroutine |
|---|---|---|---|---|---|
| 1 | 1 | 1 | 11µs | 12µs | Spreadsheet::ParseXLSX::Decryptor::Agile::BEGIN@3 |
| 1 | 1 | 1 | 3µs | 48µs | Spreadsheet::ParseXLSX::Decryptor::Agile::BEGIN@10 |
| 1 | 1 | 1 | 3µs | 19µs | Spreadsheet::ParseXLSX::Decryptor::Agile::BEGIN@4 |
| 0 | 0 | 0 | 0s | 0s | Spreadsheet::ParseXLSX::Decryptor::Agile::_generateDecryptionKey |
| 0 | 0 | 0 | 0s | 0s | Spreadsheet::ParseXLSX::Decryptor::Agile::_generateInitializationVector |
| 0 | 0 | 0 | 0s | 0s | Spreadsheet::ParseXLSX::Decryptor::Agile::decrypt |
| 0 | 0 | 0 | 0s | 0s | Spreadsheet::ParseXLSX::Decryptor::Agile::decryptFile |
| 0 | 0 | 0 | 0s | 0s | Spreadsheet::ParseXLSX::Decryptor::Agile::verifyPassword |
| Line | State ments |
Time on line |
Calls | Time in subs |
Code |
|---|---|---|---|---|---|
| 1 | package Spreadsheet::ParseXLSX::Decryptor::Agile; | ||||
| 2 | |||||
| 3 | 2 | 17µs | 2 | 14µs | # spent 12µs (11+2) within Spreadsheet::ParseXLSX::Decryptor::Agile::BEGIN@3 which was called:
# once (11µs+2µs) by Spreadsheet::ParseXLSX::Decryptor::BEGIN@19 at line 3 # spent 12µs making 1 call to Spreadsheet::ParseXLSX::Decryptor::Agile::BEGIN@3
# spent 2µs making 1 call to strict::import |
| 4 | 2 | 21µs | 2 | 35µs | # spent 19µs (3+16) within Spreadsheet::ParseXLSX::Decryptor::Agile::BEGIN@4 which was called:
# once (3µs+16µs) by Spreadsheet::ParseXLSX::Decryptor::BEGIN@19 at line 4 # spent 19µs making 1 call to Spreadsheet::ParseXLSX::Decryptor::Agile::BEGIN@4
# spent 16µs making 1 call to warnings::import |
| 5 | |||||
| 6 | # VERSION | ||||
| 7 | |||||
| 8 | # ABSTRACT: decryptor for files of version 4.4 | ||||
| 9 | |||||
| 10 | 2 | 331µs | 2 | 93µs | # spent 48µs (3+45) within Spreadsheet::ParseXLSX::Decryptor::Agile::BEGIN@10 which was called:
# once (3µs+45µs) by Spreadsheet::ParseXLSX::Decryptor::BEGIN@19 at line 10 # spent 48µs making 1 call to Spreadsheet::ParseXLSX::Decryptor::Agile::BEGIN@10
# spent 45µs making 1 call to base::import |
| 11 | |||||
| 12 | sub decrypt { | ||||
| 13 | my $self = shift; | ||||
| 14 | my ($encryptedValue, $blockKey) = @_; | ||||
| 15 | |||||
| 16 | my $key = $self->_generateDecryptionKey($blockKey); | ||||
| 17 | my $iv = $self->_generateInitializationVector('', $self->{blockSize}); | ||||
| 18 | my $cbc = Crypt::Mode::CBC->new($self->{cipherAlgorithm}, 0); | ||||
| 19 | return $cbc->decrypt($encryptedValue, $key, $iv); | ||||
| 20 | } | ||||
| 21 | |||||
| 22 | sub _generateDecryptionKey { | ||||
| 23 | my $self = shift; | ||||
| 24 | my ($blockKey) = @_; | ||||
| 25 | |||||
| 26 | my $hash; | ||||
| 27 | |||||
| 28 | unless ($self->{pregeneratedKey}) { | ||||
| 29 | $hash = $self->{hashProc}->($self->{salt} . Encode::encode('UTF-16LE', $self->{password})); | ||||
| 30 | for (my $i = 0 ; $i < $self->{spinCount} ; $i++) { | ||||
| 31 | $hash = $self->{hashProc}->(pack('L<', $i) . $hash); | ||||
| 32 | } | ||||
| 33 | $self->{pregeneratedKey} = $hash; | ||||
| 34 | } | ||||
| 35 | |||||
| 36 | $hash = $self->{hashProc}->($self->{pregeneratedKey} . $blockKey); | ||||
| 37 | |||||
| 38 | if (length($hash) > $self->{keyLength}) { | ||||
| 39 | $hash = substr($hash, 0, $self->{keyLength}); | ||||
| 40 | } elsif (length($hash) < $self->{keyLength}) { | ||||
| 41 | $hash .= "\x36" x ($self->{keyLength} - length($hash)); | ||||
| 42 | } | ||||
| 43 | return $hash; | ||||
| 44 | } | ||||
| 45 | |||||
| 46 | sub _generateInitializationVector { | ||||
| 47 | my $self = shift; | ||||
| 48 | my ($blockKey, $blockSize) = @_; | ||||
| 49 | |||||
| 50 | my $iv; | ||||
| 51 | if ($blockKey) { | ||||
| 52 | $iv = $self->{hashProc}->($self->{salt} . $blockKey); | ||||
| 53 | } else { | ||||
| 54 | $iv = $self->{salt}; | ||||
| 55 | } | ||||
| 56 | |||||
| 57 | if (length($iv) > $blockSize) { | ||||
| 58 | $iv = substr($iv, 0, $blockSize); | ||||
| 59 | } elsif (length($iv) < $blockSize) { | ||||
| 60 | $iv = $iv . ("\x36" x ($blockSize - length($iv))); | ||||
| 61 | } | ||||
| 62 | |||||
| 63 | return $iv; | ||||
| 64 | } | ||||
| 65 | |||||
| 66 | sub decryptFile { | ||||
| 67 | my $self = shift; | ||||
| 68 | my ($inFile, $outFile, $bufferLength, $key, $fileSize) = @_; | ||||
| 69 | |||||
| 70 | my $cbc = Crypt::Mode::CBC->new($self->{cipherAlgorithm}, 0); | ||||
| 71 | |||||
| 72 | my $inbuf; | ||||
| 73 | my $i = 0; | ||||
| 74 | |||||
| 75 | while (($fileSize > 0) && (my $inlen = $inFile->read($inbuf, $bufferLength))) { | ||||
| 76 | my $blockId = pack('L<', $i); | ||||
| 77 | |||||
| 78 | my $iv = $self->_generateInitializationVector($blockId, $self->{blockSize}); | ||||
| 79 | |||||
| 80 | if ($inlen < $bufferLength) { | ||||
| 81 | $inbuf .= "\x00" x ($bufferLength - $inlen); | ||||
| 82 | } | ||||
| 83 | |||||
| 84 | my $outbuf = $cbc->decrypt($inbuf, $key, $iv); | ||||
| 85 | if ($fileSize < $inlen) { | ||||
| 86 | $inlen = $fileSize; | ||||
| 87 | } | ||||
| 88 | |||||
| 89 | $outFile->write($outbuf, $inlen); | ||||
| 90 | $i++; | ||||
| 91 | $fileSize -= $inlen; | ||||
| 92 | } | ||||
| 93 | } | ||||
| 94 | |||||
| 95 | sub verifyPassword { | ||||
| 96 | my $self = shift; | ||||
| 97 | my ($encryptedVerifier, $encryptedVerifierHash, $hashSize) = @_; | ||||
| 98 | |||||
| 99 | my $encryptedVerifierHash0 = $self->{hashProc}->($self->decrypt($encryptedVerifier, "\xfe\xa7\xd2\x76\x3b\x4b\x9e\x79")); | ||||
| 100 | $encryptedVerifierHash = $self->decrypt($encryptedVerifierHash, "\xd7\xaa\x0f\x6d\x30\x61\x34\x4e"); | ||||
| 101 | $encryptedVerifierHash0 = substr($encryptedVerifierHash0, 0, $hashSize); | ||||
| 102 | $encryptedVerifierHash = substr($encryptedVerifierHash, 0, $hashSize); | ||||
| 103 | |||||
| 104 | die "Wrong password: $self" unless ($encryptedVerifierHash0 eq $encryptedVerifierHash); | ||||
| 105 | } | ||||
| 106 | |||||
| 107 | =begin Pod::Coverage | ||||
| 108 | |||||
| 109 | decrypt | ||||
| 110 | decryptFile | ||||
| 111 | verifyPassword | ||||
| 112 | |||||
| 113 | =end Pod::Coverage | ||||
| 114 | |||||
| 115 | =cut | ||||
| 116 | |||||
| 117 | 1 | 2µs | 1; |