Class BinaryRC4Decryptor

  • All Implemented Interfaces:
    java.lang.Cloneable

    public class BinaryRC4Decryptor
    extends Decryptor
    implements java.lang.Cloneable
    • Method Detail

      • verifyPassword

        public boolean verifyPassword​(java.lang.String password)
        Specified by:
        verifyPassword in class Decryptor
      • initCipherForBlock

        public javax.crypto.Cipher initCipherForBlock​(javax.crypto.Cipher cipher,
                                                      int block)
                                               throws java.security.GeneralSecurityException
        Description copied from class: Decryptor
        Initializes a cipher object for a given block index for encryption
        Overrides:
        initCipherForBlock in class Decryptor
        Parameters:
        cipher - may be null, otherwise the given instance is reset to the new block index
        block - the block index, e.g. the persist/slide id (hslf)
        Returns:
        a new cipher object, if cipher was null, otherwise the reinitialized cipher
        Throws:
        java.security.GeneralSecurityException - if the cipher can't be initialized
      • getDataStream

        public ChunkedCipherInputStream getDataStream​(DirectoryNode dir)
                                               throws java.io.IOException,
                                                      java.security.GeneralSecurityException
        Description copied from class: Decryptor
        Return a stream with decrypted data.

        Use Decryptor.getLength() to get the size of that data that can be safely read from the stream. Just reading to the end of the input stream is not sufficient because there are normally padding bytes that must be discarded

        Specified by:
        getDataStream in class Decryptor
        Parameters:
        dir - the node to read from
        Returns:
        decrypted stream
        Throws:
        java.io.IOException
        java.security.GeneralSecurityException
      • getDataStream

        public java.io.InputStream getDataStream​(java.io.InputStream stream,
                                                 int size,
                                                 int initialPos)
                                          throws java.io.IOException,
                                                 java.security.GeneralSecurityException
        Description copied from class: Decryptor
        Wraps a stream for decryption

        As we are handling streams and don't know the total length beforehand, it's the callers duty to care for the length of the entries.

        Overrides:
        getDataStream in class Decryptor
        Parameters:
        stream - the stream to be wrapped
        initialPos - initial/current byte position within the stream
        Returns:
        decrypted stream
        Throws:
        java.io.IOException
        java.security.GeneralSecurityException
      • setChunkSize

        public void setChunkSize​(int chunkSize)
        Description copied from class: Decryptor
        Sets the chunk size of the data stream. Needs to be set before the data stream is requested. When not set, the implementation uses method specific default values
        Overrides:
        setChunkSize in class Decryptor
        Parameters:
        chunkSize - the chunk size, i.e. the block size with the same encryption key
      • clone

        public BinaryRC4Decryptor clone()
                                 throws java.lang.CloneNotSupportedException
        Overrides:
        clone in class Decryptor
        Throws:
        java.lang.CloneNotSupportedException