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password protected pdf decryption issue #5

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Merged
avinash-wakale merged 1 commit into from
Jan 29, 2026
Merged

password protected pdf decryption issue #5

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12 changes: 11 additions & 1 deletion pkg/pdfcpu/crypto.go
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Original file line number Diff line number Diff line change
Expand Up @@ -739,11 +739,21 @@ func validateOwnerPassword(ctx *model.Context) (ok bool, err error) {

func validateCFLength(len int, cfm *string) bool {
// See table 25 Length
// Note: Length can be expressed in bytes or bits depending on the security handler.
// AESV2 (AES-128) expects Length=16 (bytes) or Length=128 (bits)
// AESV3 (AES-256) expects Length=32 (bytes) or Length=256 (bits)

if cfm != nil {
if (*cfm == "AESV2" && len != 16) || (*cfm == "AESV3" && len != 32) {
if *cfm == "AESV2" && len != 16 && len != 128 {
return false
}
if *cfm == "AESV3" && len != 32 && len != 256 {
return false
}
// If we matched a valid AESV2 or AESV3 length, return early
if *cfm == "AESV2" || *cfm == "AESV3" {
return true
}
}

// Standard security handler expresses in bytes.
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