org.alfresco.encryption

Class DecryptingInputStream

java.lang.Object

java.io.InputStream

org.alfresco.encryption.DecryptingInputStream

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

public class DecryptingInputStream
extends java.io.InputStream

An input stream that encrypts data produced by a EncryptingOutputStream. A lightweight yet secure hybrid encryption scheme is used. A random symmetric key is decrypted using the receiver's private key. The supplied data is then decrypted using the symmetric key and read on a streaming basis. When the end of the stream is reached or the stream is closed, a HMAC checksum of the entire stream contents is validated.

Constructor Summary

Constructors

Constructor and Description
DecryptingInputStream(java.io.InputStream wrapped, java.security.PrivateKey privKey) Constructs a DecryptingInputStream using default symmetric encryption parameters.
DecryptingInputStream(java.io.InputStream wrapped, java.security.PrivateKey privKey, java.lang.String algorithm, java.lang.String mode, java.lang.String padding) Constructs a DecryptingInputStream.

Method Summary

Methods

Modifier and Type	Method and Description
int	available()
void	close()
int	read()
int	read(byte[] b)
int	read(byte[] b, int off, int len)

Methods inherited from class java.io.InputStream

mark, markSupported, reset, skip

Methods inherited from class java.lang.Object

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

Constructor Detail

DecryptingInputStream

public DecryptingInputStream(java.io.InputStream wrapped,
                     java.security.PrivateKey privKey)
                      throws java.io.IOException,
                             java.security.NoSuchAlgorithmException,
                             javax.crypto.NoSuchPaddingException,
                             java.security.InvalidKeyException,
                             javax.crypto.IllegalBlockSizeException,
                             javax.crypto.BadPaddingException,
                             java.security.InvalidAlgorithmParameterException,
                             java.security.NoSuchProviderException

Constructs a DecryptingInputStream using default symmetric encryption parameters.

Parameters:

wrapped - the input stream to decrypt

privKey - the receiver's private key for decrypting the symmetric key

Throws:

java.io.IOException - Signals that an I/O exception has occurred.

java.security.NoSuchAlgorithmException - the no such algorithm exception

javax.crypto.NoSuchPaddingException - the no such padding exception

java.security.InvalidKeyException - the invalid key exception

javax.crypto.IllegalBlockSizeException - the illegal block size exception

javax.crypto.BadPaddingException - the bad padding exception

java.security.InvalidAlgorithmParameterException - the invalid algorithm parameter exception

java.security.NoSuchProviderException - the no such provider exception

DecryptingInputStream

public DecryptingInputStream(java.io.InputStream wrapped,
                     java.security.PrivateKey privKey,
                     java.lang.String algorithm,
                     java.lang.String mode,
                     java.lang.String padding)
                      throws java.io.IOException,
                             java.security.NoSuchAlgorithmException,
                             javax.crypto.NoSuchPaddingException,
                             java.security.InvalidKeyException,
                             javax.crypto.IllegalBlockSizeException,
                             javax.crypto.BadPaddingException,
                             java.security.InvalidAlgorithmParameterException,
                             java.security.NoSuchProviderException

Constructs a DecryptingInputStream.

Parameters:

wrapped - the input stream to decrypt

privKey - the receiver's private key for decrypting the symmetric key

algorithm - encryption algorithm (e.g. "AES")

mode - encryption mode (e.g. "CBC")

padding - padding scheme (e.g. "PKCS5PADDING")

Throws:

java.io.IOException - Signals that an I/O exception has occurred.

java.security.NoSuchAlgorithmException - the no such algorithm exception

javax.crypto.NoSuchPaddingException - the no such padding exception

java.security.InvalidKeyException - the invalid key exception

javax.crypto.IllegalBlockSizeException - the illegal block size exception

javax.crypto.BadPaddingException - the bad padding exception

java.security.InvalidAlgorithmParameterException - the invalid algorithm parameter exception

java.security.NoSuchProviderException - the no such provider exception

Method Detail

read

public int read()
         throws java.io.IOException

Specified by:

read in class java.io.InputStream

Throws:

java.io.IOException

read

public int read(byte[] b)
         throws java.io.IOException

Overrides:

read in class java.io.InputStream

Throws:

java.io.IOException

read

public int read(byte[] b,
       int off,
       int len)
         throws java.io.IOException

Overrides:

read in class java.io.InputStream

Throws:

java.io.IOException

available

public int available()
              throws java.io.IOException

Overrides:

available in class java.io.InputStream

Throws:

java.io.IOException

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

Overrides:

close in class java.io.InputStream

Throws:

java.io.IOException