Tryanks/pdfsign
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Check if signature actually fits in file

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This commit is contained in:
Jeroen Bobbeldijk
2017-07-13 21:59:39 +02:00
parent 3928b7d813
commit e51daf9a81
1 changed files with 4 additions and 0 deletions
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4
sign/pdfsignature.go
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@@ -241,6 +241,10 @@ func (context *SignContext) replaceSignature() error {
dst := make([]byte, hex.EncodedLen(len(signature))) dst := make([]byte, hex.EncodedLen(len(signature)))
hex.Encode(dst, signature) hex.Encode(dst, signature)
if uint32(len(dst)) > signatureMaxLength {
return errors.New("Signature is too big to fit in reserved space.")
}
context.OutputFile.WriteAt(dst, context.ByteRangeValues[0]+context.ByteRangeValues[1]+1) context.OutputFile.WriteAt(dst, context.ByteRangeValues[0]+context.ByteRangeValues[1]+1)
return nil return nil