## org.apache.poi.poifs.crypt
Class EcmaDecryptor

    java.lang.Object
      org.apache.poi.poifs.crypt.Decryptor
          org.apache.poi.poifs.crypt.EcmaDecryptor

    public class EcmaDecryptor

extends Decryptor

Author:
  Maxim Valyanskiy, Gary King

Field Summary

Fields inherited from class org.apache.poi.poifs.crypt.Decryptor
`DEFAULT_PASSWORD`

Constructor Summary
`EcmaDecryptor(EncryptionInfo info)`

Method Summary
`java.io.InputStream` `getDataStream(DirectoryNode dir)` Return a stream with decrypted data.
`long` `getLength()` Returns the length of the encytpted data that can be safely read with `Decryptor.getDataStream(org.apache.poi.poifs.filesystem.DirectoryNode)`.
`boolean` `verifyPassword(java.lang.String password)`

Methods inherited from class org.apache.poi.poifs.crypt.Decryptor
`getBlockSize, getDataStream, getDataStream, getInstance, hashPassword`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### EcmaDecryptor

    public EcmaDecryptor(EncryptionInfo info)

Method Detail

### verifyPassword

    public boolean verifyPassword(java.lang.String password)
                           throws java.security.GeneralSecurityException

  Specified by:
    `verifyPassword` in class `Decryptor`
  Throws:
    `java.security.GeneralSecurityException`

### getDataStream

    public java.io.InputStream 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`

### getLength

    public long getLength()

  Description copied from class: `Decryptor`
  Returns the length of the encytpted data that can be safely read with `Decryptor.getDataStream(org.apache.poi.poifs.filesystem.DirectoryNode)`. Just reading to the end of the input stream is not sufficient because there are normally padding bytes that must be discarded

  The length variable is initialized in `Decryptor.getDataStream(org.apache.poi.poifs.filesystem.DirectoryNode)`, an attempt to call getLength() prior to getDataStream() will result in IllegalStateException.

  Specified by:
    `getLength` in class `Decryptor`
  Returns:
    length of the encrypted data

Copyright 2012 The Apache Software Foundation or its licensors, as applicable.