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Fix for invalid crypto lengths (given in bits rather than bytes) for compatibility

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This commit is contained in:
Gunnsteinn Hall 2016-12-02 22:32:13 +00:00
parent eb1edeb73e
commit a0a9fa6289
1 changed files with 6 additions and 1 deletions
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7
pdf/core/crypt.go
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@ -122,7 +122,12 @@ func (this *PdfCrypt) LoadCryptFilters(ed *PdfObjectDictionary) error {
// Standard security handler expresses the length in multiples of 8 (16 means 128)
// We only deal with standard so far. (Public key not supported yet).
if *length < 5 || *length > 16 {
return fmt.Errorf("Crypt filter length not in range 40 - 128 bit (%d)", *length)
if *length == 64 || *length == 128 {
common.Log.Debug("STANDARD VIOLATION: Crypt Length appears to be in bits rather than bytes - assuming bits (%d)", *length)
*length /= 8
} else {
return fmt.Errorf("Crypt filter length not in range 40 - 128 bit (%d)", *length)
}
}
cf.Length = int(*length)
}