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Make it possible to change the signature reservation

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Přemysl Eric Janouch
2020-09-04 18:33:12 +02:00
parent 2d08100b58
commit 796a9640d3
4 changed files with 36 additions and 17 deletions
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8
pdf/pdf.go
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@@ -1115,12 +1115,14 @@ func FillInSignature(document []byte, signOff, signLen int,
// There must be at least one certificate, matching the private key.
// The certificates must form a chain.
//
// A good default for the reservation is around 4096 (the value is in bytes).
//
// The presumption here is that the document is valid and that it doesn't
// employ cross-reference streams from PDF 1.5, or at least constitutes
// a hybrid-reference file. The results with PDF 2.0 (2017) are currently
// unknown as the standard costs money.
func Sign(document []byte,
key crypto.PrivateKey, certs []*x509.Certificate) ([]byte, error) {
func Sign(document []byte, key crypto.PrivateKey, certs []*x509.Certificate,
reservation int) ([]byte, error) {
pdf, err := NewUpdater(document)
if err != nil {
return nil, err
@@ -1152,7 +1154,7 @@ func Sign(document []byte,
buf.WriteString("\n /Contents <")
signOff = buf.Len()
signLen = 8192 // cert, digest, encrypted digest, ...
signLen = reservation * 2 // cert, digest, encrypted digest, ...
buf.Write(bytes.Repeat([]byte{'0'}, signLen))
buf.WriteString("> >>")