Class IdentityDecrypter

  • All Implemented Interfaces:
    PDFDecrypter

    public class IdentityDecrypter
    extends java.lang.Object
    implements PDFDecrypter
    Performs identity decryption; that is, inputs aren't encrypted and are returned right back.
    • Constructor Detail

      • IdentityDecrypter

        public IdentityDecrypter()
    • Method Detail

      • decryptBuffer

        public java.nio.ByteBuffer decryptBuffer​(java.lang.String cryptFilterName,
                                                 PDFObject streamObj,
                                                 java.nio.ByteBuffer streamBuf)
                                          throws PDFParseException
        Description copied from interface: PDFDecrypter
        Decrypt a buffer of data
        Specified by:
        decryptBuffer in interface PDFDecrypter
        Parameters:
        cryptFilterName - the name of the crypt filter, if V4 encryption is being used, where individual crypt filters may be specified for individual streams. If encryption is not using V4 encryption (indicated by V=4 in the Encrypt dictionary) then this must be null. Null may also be specified with V4 encryption to indicate that the default filter should be used.
        streamObj - the object whose stream is being decrypted. The containing object's number and generation contribute to the key used for stream encrypted with the document's default encryption, so this is typically required. Should be null only if a cryptFilterName is specified, as objects with specific stream filters use the general document key, rather than a stream-specific key.
        streamBuf - the buffer to decrypt
        Returns:
        a buffer containing the decrypted stream, positioned at its beginning; will only be the same buffer as streamBuf if the identity decrypter is being used
        Throws:
        PDFParseException - if the named crypt filter does not exist, or if a crypt filter is named when named crypt filters are not supported. Problems due to incorrect passwords are revealed prior to this point.
      • decryptString

        public java.lang.String decryptString​(int objNum,
                                              int objGen,
                                              java.lang.String inputBasicString)
        Description copied from interface: PDFDecrypter
        Decrypt a basic string.
        Specified by:
        decryptString in interface PDFDecrypter
        Parameters:
        objNum - the object number of the containing object
        objGen - the generation number of the containing object
        inputBasicString - the string to be decrypted
        Returns:
        the decrypted string
      • isEncryptionPresent

        public boolean isEncryptionPresent()
        Description copied from interface: PDFDecrypter
        Determine whether this actually applies a decryption other than identity decryption.
        Specified by:
        isEncryptionPresent in interface PDFDecrypter
        Returns:
        whether encryption is present
      • isOwnerAuthorised

        public boolean isOwnerAuthorised()
        Description copied from interface: PDFDecrypter
        Determine whether the password known by the decrypter indicates that the user is the owner of the document. Can be used, in conjunction with PDFDecrypter.isEncryptionPresent() to determine whether any permissions apply.
        Specified by:
        isOwnerAuthorised in interface PDFDecrypter
        Returns:
        whether owner authentication is being used to decrypt the document