Module com.github.librepdf.openpdf
Package com.lowagie.text.pdf

Class PdfEncryption

  • public class PdfEncryption
extends Object
    Author:
    Paulo Soares (psoares@consiste.pt), Kazuya Ujihara

    • Constructor Detail

      • PdfEncryption

        public PdfEncryption()

    • Method Detail

      • createDocumentId

        public static byte[] createDocumentId()

      • createInfoId

        public static PdfObject createInfoId​(byte[] id)

      • createInfoId

        public static PdfObject createInfoId​(byte[] idPartOne,
                                     byte[] idPartTwo)

      • getFileIdChangingPart

        public static byte[] getFileIdChangingPart​(PdfObject fileId)
        This method returns a changing part of the fileId when can be identified. Returns a complete fileId of the changing part is not found.
        Parameters:
        fileId - PdfObject
        Returns:
        byte array representing the changing part of the document identifier

      • setCryptoMode

        public void setCryptoMode​(int mode,
                          int kl)

      • getCryptoMode

        public int getCryptoMode()

      • isMetadataEncrypted

        public boolean isMetadataEncrypted()

      • isEmbeddedFilesOnly

        public boolean isEmbeddedFilesOnly()
        Indicates if only the embedded files have to be encrypted.
        Returns:
        if true only the embedded files will be encrypted
        Since:
        2.1.3

      • setupAllKeys

        public void setupAllKeys​(byte[] userPassword,
                         byte[] ownerPassword,
                         int permissions)

      • setupByUserPassword

        public void setupByUserPassword​(byte[] documentID,
                                byte[] userPassword,
                                byte[] ownerKey,
                                int permissions)
        Parameters:
        documentID - byte array of document id
        userPassword - byte array of user password
        ownerKey - byte array of owner key
        permissions - permissions

      • setupByOwnerPassword

        public void setupByOwnerPassword​(byte[] documentID,
                                 byte[] ownerPassword,
                                 byte[] userKey,
                                 byte[] ownerKey,
                                 int permissions)
        Parameters:
        documentID - byte array of document id
        ownerPassword - byte array of owner password
        userKey - byte array of user key
        ownerKey - byte array of owner key
        permissions - permissions

      • setupByEncryptionKey

        public void setupByEncryptionKey​(byte[] key,
                                 int keylength)

      • setHashKey

        public void setHashKey​(int number,
                       int generation)

      • getEncryptionDictionary

        public PdfDictionary getEncryptionDictionary()

      • calculateStreamSize

        public int calculateStreamSize​(int n)

      • encryptByteArray

        public byte[] encryptByteArray​(byte[] b)

      • decryptByteArray

        public byte[] decryptByteArray​(byte[] b)

      • addRecipient

        public void addRecipient​(Certificate cert,
                         int permission)

      • computeUserPassword

        public byte[] computeUserPassword​(byte[] ownerPassword)

      • setupByOwnerPassword

        public void setupByOwnerPassword​(byte[] documentID,
                                 byte[] ownerPassword,
                                 byte[] uValue,
                                 byte[] ueValue,
                                 byte[] oValue,
                                 byte[] oeValue,
                                 int permissions)
                          throws GeneralSecurityException
        implements step d of Algorithm 2.A: Retrieving the file encryption key from an encrypted document in order to decrypt it (revision 6 and later) - ISO 32000-2 section 7.6.4.3.3
        Throws:
        GeneralSecurityException

      • setupByUserPassword

        public void setupByUserPassword​(byte[] documentID,
                                byte[] userPassword,
                                byte[] uValue,
                                byte[] ueValue,
                                byte[] oValue,
                                byte[] oeValue,
                                int permissions)
                         throws GeneralSecurityException
        implements step e of Algorithm 2.A: Retrieving the file encryption key from an encrypted document in order to decrypt it (revision 6 and later) - ISO 32000-2 section 7.6.4.3.3
        Throws:
        GeneralSecurityException

      • decryptAndCheckPerms

        public boolean decryptAndCheckPerms​(byte[] permsValue)
                             throws GeneralSecurityException
        implements step f of Algorithm 2.A: Retrieving the file encryption key from an encrypted document in order to decrypt it (revision 6 and later) - ISO 32000-2 section 7.6.4.3.3
        Throws:
        GeneralSecurityException