Package com.ribs.pdf

Class PDFSecurityHandler

  • Direct Known Subclasses:
    PDFEncryptor
    public class PDFSecurityHandler
extends java.lang.Object

    • Field Detail

      • EXTRACT_TEXT_AND_IMAGES_ALLOWED

        public static final int EXTRACT_TEXT_AND_IMAGES_ALLOWED
        See Also:
        Constant Field Values

      • ADD_ANNOTATIONS_ALLOWED

        public static final int ADD_ANNOTATIONS_ALLOWED
        See Also:
        Constant Field Values

      • ACCESSABILITY_EXTRACTS_ALLOWED

        public static final int ACCESSABILITY_EXTRACTS_ALLOWED
        See Also:
        Constant Field Values

      • ASSEMBLE_DOCUMENT_ALLOWED

        public static final int ASSEMBLE_DOCUMENT_ALLOWED
        See Also:
        Constant Field Values

      • MAXIMUM_RESOLUTION_PRINTING_ALLOWED

        public static final int MAXIMUM_RESOLUTION_PRINTING_ALLOWED
        See Also:
        Constant Field Values

    • Constructor Detail

      • PDFSecurityHandler

        public PDFSecurityHandler()

    • Method Detail

      • registerHandler

        public static java.lang.Class registerHandler​(java.lang.Class hclass,
                                              java.lang.String key)
        like a test&set. pass null for class to look up, otherwise it sets

      • getHandler

        public static java.lang.Class getHandler​(java.lang.String name)
        Convenience method for above

      • getInstance

        public static PDFSecurityHandler getInstance​(java.util.Map encryptionDict,
                                             java.util.List fileID,
                                             java.lang.String pdfversion)
        Returns an instance of the appropriate PDFSecurityHandler subclass. Since any number of different security handlers can be used in pdf, callers should use this method rather than instantiating a handler directly. This also does authentication with the handler, possibly raising a panel to ask for passwords, keys, etc.

      • init

        public void init​(java.util.Map encryptionDict,
                 java.util.List fileID,
                 java.lang.String pdfversion,
                 java.lang.String apass)
          throws com.ribs.pdf.PDFBadPasswordException
        Main security handler initialization. Calculates everything necessary to decrypt the pdf objects and performs authorization if necessary.
        Throws:
        com.ribs.pdf.PDFBadPasswordException

      • setEncryptionParameters

        public void setEncryptionParameters​(byte[] fileID,
                                    java.lang.String ownerP,
                                    java.lang.String userP,
                                    int permissionFlags)
        Initialization for encryption. Sets parameters to revision=3, 128 bit keys

      • getEncryptionKey

        public byte[] getEncryptionKey​(java.util.Map encrypt,
                               java.util.List fileID,
                               java.lang.String pass)
        Gets the key length and algorithm from the dictionary and creats the key

      • pad

        public byte[] pad​(java.lang.String password)
        returns a 32 byte array with the characters of the input string, potentially padded with the password padding.

      • generateEncryptionKey

        public byte[] generateEncryptionKey​(byte[] oEntry,
                                    java.lang.String password,
                                    int keyLength)
        Uses algorithm 3.2 from pdf spec to generate a key from the file

      • authenticateUserPassword

        public void authenticateUserPassword​(byte[] uEntry)
                              throws com.ribs.pdf.PDFBadPasswordException
        Throws:
        com.ribs.pdf.PDFBadPasswordException

      • getUserPasswordEntryBytes

        public byte[] getUserPasswordEntryBytes()

      • getBytesForEncryptionEntry

        public static byte[] getBytesForEncryptionEntry​(java.util.Map encDict,
                                                java.lang.String key)

      • getEncryptionEntryStringForBytes

        public static java.lang.String getEncryptionEntryStringForBytes​(byte[] buffer)
        Inverse of above

      • startDecrypt

        public void startDecrypt​(int objNum,
                         int generationNum)

      • decryptObject

        public java.lang.Object decryptObject​(java.lang.Object o,
                                      int objNum,
                                      int generationNum)

      • decryptDeep

        public java.lang.Object decryptDeep​(java.lang.Object o)

      • getOwnerPasswordEntryBytes

        public byte[] getOwnerPasswordEntryBytes​(java.lang.String ownerP,
                                         java.lang.String userP)
        For encryption - generate a /O encryption entry for an encryption dictionary (from Algorithm 3.3 of the spec) This routine uses Revision 3 of the algorithm and 128 bit keys.

      • getOwnerPasswordEntry

        public java.lang.String getOwnerPasswordEntry​(java.lang.String ownerP,
                                              java.lang.String userP)
        Returns the string corresponding to the /O entry.

      • getUserPasswordEntry

        public java.lang.String getUserPasswordEntry()
        Returns the string corresponding to the /U entry. The encryption key is assumed to be calculated already.

      • main

        public static void main​(java.lang.String[] args)

      • arcfour_decrypt

        public void arcfour_decrypt​(byte[] inout)
        decrypt using the cached encryption key