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Add safety check for invalid font obfuscation key #129

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Merged
merged 1 commit into from
Oct 9, 2024
Merged

Add safety check for invalid font obfuscation key #129

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6 changes: 6 additions & 0 deletions pkg/parser/epub/deobfuscator.go
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Original file line number Diff line number Diff line change
Expand Up @@ -119,6 +119,12 @@ func (d DeobfuscatingResource) Stream(w io.Writer, start int64, end int64) (int6
shasum := sha1.Sum([]byte(d.identifier))
obfuscationKey = shasum[:]
}

// If getHashKeyAdobe() is blank, meaning the hex decoding of the UUID failed
if len(obfuscationKey) == 0 {
return 0, fetcher.Other(errors.New("error deriving font deobfuscation key"))
}

deobfuscateFont(obfuscatedPortion, start, obfuscationKey, v)

defer pr.Close()
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