Package com.itextpdf.kernel.crypto

Class OutputStreamAesGcmEncryption

  • All Implemented Interfaces:
    java.io.Closeable, java.io.Flushable, java.lang.AutoCloseable
    public class OutputStreamAesGcmEncryption
extends OutputStreamEncryption
    An output stream accepts output bytes and sends them to underlying OutputStreamEncryption instance.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void finish()
      Finishes and dispose all resources used for writing in encrypted stream.
      void write​(byte[] b, int off, int len)
      Writes len bytes from the specified byte array starting at offset off to this output stream.

      • Methods inherited from class java.io.OutputStream

        nullOutputStream

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Field Detail

      • finished

        private boolean finished

      • rng

        private static final java.security.SecureRandom rng

    • Constructor Detail

      • OutputStreamAesGcmEncryption

        public OutputStreamAesGcmEncryption​(java.io.OutputStream out,
                                    byte[] key,
                                    byte[] noncePart)
        Creates a new instance of OutputStreamAesGcmEncryption.
        Parameters:
        out - the OutputStream instance to be used as the destination for the encrypted content
        key - the byte array containing the key for encryption
        noncePart - a 7 byte nonce

    • Method Detail

      • write

        public void write​(byte[] b,
                  int off,
                  int len)
           throws java.io.IOException
        Writes len bytes from the specified byte array starting at offset off to this output stream. The general contract for write(b, off, len) is that some bytes in the array b are written to the output stream in order; element b[off] is the first byte written and b[off+len-1] is the last byte written by this operation.

        The write method of OutputStream calls the write method of one argument on each of the bytes to be written out. Subclasses are encouraged to override this method and provide a more efficient implementation.

        If off is negative, or len is negative, or off+len is greater than the length of the array b, then an IndexOutOfBoundsException is thrown.

        Specified by:
        write in class OutputStreamEncryption
        Parameters:
        b - the data
        off - the start offset in the data
        len - the number of bytes to write
        Throws:
        java.io.IOException - if an I/O error occurs. In particular, an IOException is thrown if the output stream is closed

      • finish

        public void finish()
        Finishes and dispose all resources used for writing in encrypted stream. Input data that may have been buffered during a previous update operation is processed, with padding (if requested) being applied and authentication tag is appended.
        Specified by:
        finish in class OutputStreamEncryption