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Date: Sat, 10 Jan 2015 16:10:52 +0100
From: Tilman Hausherr <THausherr@t-online.de>
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To: users@pdfbox.apache.org
Subject: Re: Problem while decrypting a pdf file in Linux
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Hi,

Please try PDDocument.loadNonSeq instead of load. It should then work 
with 1.8.8.

If it still doesn't work, please open an issue in JIRA, but read this to 
create a good bug report:
https://pdfbox.apache.org/support.html

Tilman

Am 09.01.2015 um 09:55 schrieb Barry Zhao [Zhao]:
> Hi team,
>
> I use PDFBox V1.8.7.
> In Windows, it can work well.
> When I run my code in Linux, I got the exception below:
> java.io.IOException: javax.crypto.IllegalBlockSizeException: Input 
> length must be multiple of 16 when decrypting with padded cipher
> at javax.crypto.CipherInputStream.getMoreData(CipherInputStream.java:115)
> at javax.crypto.CipherInputStream.read(CipherInputStream.java:233)
> at javax.crypto.CipherInputStream.read(CipherInputStream.java:209)
> at 
> org.apache.pdfbox.pdmodel.encryption.SecurityHandler.encryptData(SecurityHandler.java:316)
> at 
> org.apache.pdfbox.pdmodel.encryption.SecurityHandler.decryptString(SecurityHandler.java:486)
> at 
> org.apache.pdfbox.pdmodel.encryption.SecurityHandler.decrypt(SecurityHandler.java:386)
> at 
> org.apache.pdfbox.pdmodel.encryption.SecurityHandler.decryptDictionary(SecurityHandler.java:466)
> at 
> org.apache.pdfbox.pdmodel.encryption.SecurityHandler.decrypt(SecurityHandler.java:394)
> at 
> org.apache.pdfbox.pdmodel.encryption.SecurityHandler.decryptObject(SecurityHandler.java:365)
> at 
> org.apache.pdfbox.pdmodel.encryption.SecurityHandler.proceedDecryption(SecurityHandler.java:196)
> at 
> org.apache.pdfbox.pdmodel.encryption.StandardSecurityHandler.decryptDocument(StandardSecurityHandler.java:158)
> at 
> org.apache.pdfbox.pdmodel.PDDocument.openProtection(PDDocument.java:1595)
> at org.apache.pdfbox.pdmodel.PDDocument.decrypt(PDDocument.java:942)
>  .....etc.
> 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:750)
> at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:676)
> at com.sun.crypto.provider.AESCipher.engineDoFinal(AESCipher.java:313)
> at javax.crypto.Cipher.doFinal(Cipher.java:1970)
> at javax.crypto.CipherInputStream.getMoreData(CipherInputStream.java:112)
>
> And my code is :
> PDDocument doc = PDDocument.load(originFile);
> if (doc.isEncrypted())
> {
> try
> {
> DecryptionMaterial dm = new StandardDecryptionMaterial("");
> doc.openProtection(dm);
> doc.setAllSecurityToBeRemoved(true);
> }
> catch (Exception cre) {
> cre.printStackTrace();
> }
> }
>
> And my jre version is 1.7.
> I use the attachment file to do the operation.
>
> Please help me to figure out the problem or do you guys have 
> workarounds for this?
> Many thanks.
>
> Best wishes,
> Barry


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