org.apache.hadoop.crypto

Class OpensslCtrCryptoCodec.OpensslCtrCipher

java.lang.Object

org.apache.hadoop.crypto.OpensslCtrCryptoCodec.OpensslCtrCipher

All Implemented Interfaces:

org.apache.hadoop.crypto.Decryptor, org.apache.hadoop.crypto.Encryptor

Enclosing class:

org.apache.hadoop.crypto.OpensslCtrCryptoCodec

protected static class OpensslCtrCryptoCodec.OpensslCtrCipher
extends Object
implements org.apache.hadoop.crypto.Encryptor, org.apache.hadoop.crypto.Decryptor

Constructor Summary

Constructors

Constructor and Description
OpensslCtrCipher(int mode, org.apache.hadoop.crypto.CipherSuite suite)
OpensslCtrCipher(int mode, org.apache.hadoop.crypto.CipherSuite suite, String engineId)

Method Summary

Modifier and Type	Method and Description
void	decrypt(ByteBuffer inBuffer, ByteBuffer outBuffer) AES-CTR will consume all of the input data.
void	encrypt(ByteBuffer inBuffer, ByteBuffer outBuffer) AES-CTR will consume all of the input data.
void	init(byte[] key, byte[] iv) Initialize the encryptor and the internal encryption context.
boolean	isContextReset() Indicate whether the encryption context is reset.

Methods inherited from class java.lang.Object

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

Constructor Detail

OpensslCtrCipher

public OpensslCtrCipher(int mode,
                        org.apache.hadoop.crypto.CipherSuite suite,
                        String engineId)
                 throws GeneralSecurityException

Throws:

GeneralSecurityException

OpensslCtrCipher

public OpensslCtrCipher(int mode,
                        org.apache.hadoop.crypto.CipherSuite suite)
                 throws GeneralSecurityException

Throws:

GeneralSecurityException

Method Detail

init

public void init(byte[] key,
                 byte[] iv)
          throws IOException

Description copied from interface: org.apache.hadoop.crypto.Encryptor

Initialize the encryptor and the internal encryption context.

Specified by:

init in interface org.apache.hadoop.crypto.Decryptor

Specified by:

init in interface org.apache.hadoop.crypto.Encryptor

Parameters:

key - encryption key.

iv - encryption initialization vector

Throws:

IOException - if initialization fails

encrypt

public void encrypt(ByteBuffer inBuffer,
                    ByteBuffer outBuffer)
             throws IOException

AES-CTR will consume all of the input data. It requires enough space in the destination buffer to encrypt entire input buffer.

Specified by:

encrypt in interface org.apache.hadoop.crypto.Encryptor

Parameters:

inBuffer - a direct ByteBuffer to read from. inBuffer may not be null and inBuffer.remaining() must be > 0

outBuffer - a direct ByteBuffer to write to. outBuffer may not be null and outBuffer.remaining() must be > 0

Throws:

IOException - if encryption fails

decrypt

public void decrypt(ByteBuffer inBuffer,
                    ByteBuffer outBuffer)
             throws IOException

AES-CTR will consume all of the input data. It requires enough space in the destination buffer to decrypt entire input buffer.

Specified by:

decrypt in interface org.apache.hadoop.crypto.Decryptor

Parameters:

inBuffer - a direct ByteBuffer to read from. inBuffer may not be null and inBuffer.remaining() must be > 0

outBuffer - a direct ByteBuffer to write to. outBuffer may not be null and outBuffer.remaining() must be > 0

Throws:

IOException - if decryption fails

isContextReset

public boolean isContextReset()

Description copied from interface: org.apache.hadoop.crypto.Encryptor

Indicate whether the encryption context is reset.

Certain modes, like CTR, require a different IV depending on the position in the stream. Generally, the encryptor maintains any necessary context for calculating the IV and counter so that no reinit is necessary during the encryption. Reinit before each operation is inefficient.

Specified by:

isContextReset in interface org.apache.hadoop.crypto.Decryptor

Specified by:

isContextReset in interface org.apache.hadoop.crypto.Encryptor

Returns:

boolean whether context is reset.