Hi,
I am trying to decrypt a pdf from a customer using pdfbox and loadNonSeq:
In Acrobat the pfd (I could send a private link to the file) is reported as
“Password Security”:
Security Method: Password Security
Document Open Password: No
Permissions Password: Yes
Printing: High Resolution
Changing the Document: Not Allowed
Commenting: Not Allowed
Form Field Fill-in or Signing: Not Allowed
Document Assembly: Not Allowed
Content Copying: Allowed
Content Accessibility Enabled: Allowed
Page Extraction: Not Allowed
Encryption Level: High (128-bit AES)
but when using the code:
File scratchFile = File.createTempFile("m3_", null);
FileInputStream fis = null;
PDDocument doc = null;
try {
RandomAccessFile scratch = new RandomAccessFile(scratchFile, "rw");
fis = new FileInputStream("build/test/file02.pdf");
doc = PDDocument.loadNonSeq(fis, scratch);
if (doc.isEncrypted()) {
System.out.println("Pdf is encrypted!!!");
StandardDecryptionMaterial sdm = new
StandardDecryptionMaterial(THEPASSWORD);
doc.openProtection(sdm);
doc.save("build/test/file02_decrypted.pdf");
}
} catch (Exception e) {
e.printStackTrace(System.err);
} finally {
if (doc!=null) doc.close();
if (fis!=null) fis.close();
scratchFile.delete();
}
using pdfbox 1.8.10 on osx running java 1.8.0_31 I got:
org.apache.pdfbox.exceptions.WrappedIOException
at
org.apache.pdfbox.pdmodel.encryption.SecurityHandler.encryptData(SecurityHandler.java:372)
at
org.apache.pdfbox.pdmodel.encryption.SecurityHandler.decryptStream(SecurityHandler.java:476)
at
org.apache.pdfbox.pdmodel.encryption.SecurityHandler.decrypt(SecurityHandler.java:434)
at
org.apache.pdfbox.pdmodel.encryption.SecurityHandler.decryptObject(SecurityHandler.java:404)
at
org.apache.pdfbox.pdmodel.encryption.SecurityHandler.proceedDecryption(SecurityHandler.java:222)
at
org.apache.pdfbox.pdmodel.encryption.StandardSecurityHandler.decryptDocument(StandardSecurityHandler.java:158)
at
org.apache.pdfbox.pdmodel.PDDocument.openProtection(PDDocument.java:1609)
...
Caused by: javax.crypto.IllegalBlockSizeException: Input length must be
multiple of 16 when decrypting with padded cipher
at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:913)
at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:824)
at com.sun.crypto.provider.AESCipher.engineDoFinal(AESCipher.java:436)
at javax.crypto.Cipher.doFinal(Cipher.java:2004)
at
org.apache.pdfbox.pdmodel.encryption.SecurityHandler.encryptData(SecurityHandler.java:352)
... 32 more
If I change to doc = PDDocument.load(fis);
similar to the code found in Decrypt.java then it is working fine.
/Toël
