com.itextpdf.kernel.crypto

Class AESGCMCipher

java.lang.Object

com.itextpdf.kernel.crypto.AESGCMCipher

public class AESGCMCipher
extends Object

Creates an Advanced Encryption Standard-Galois/Counter Mode (AES-GCM) Cipher.

Field Summary

Fields

Modifier and Type	Field and Description
static int	MAC_SIZE_BITS

Constructor Summary

Constructors

Constructor and Description
AESGCMCipher(boolean forEncryption, byte[] key, byte[] iv) Creates a new instance of AESGCMCipher.

Method Summary

Modifier and Type	Method and Description
byte[]	doFinal() Finishes a multiple-part encryption or decryption operation, depending on how this cipher was initialized and resets underlying cipher object to the state it was in when previously initialized via a call to init.
byte[]	update(byte[] b, int off, int len) Continues a multiple-part encryption or decryption operation (depending on how this cipher was initialized), processing another data part.

Methods inherited from class java.lang.Object

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

Field Detail

MAC_SIZE_BITS

public static final int MAC_SIZE_BITS

See Also:

Constant Field Values

Constructor Detail

AESGCMCipher

public AESGCMCipher(boolean forEncryption,
                    byte[] key,
                    byte[] iv)

Creates a new instance of AESGCMCipher.

Parameters:

forEncryption - if true the cipher is initialised for encryption, if false for decryption

key - the key to be used in the cipher

iv - initialization vector to be used in cipher

Method Detail

update

public byte[] update(byte[] b,
                     int off,
                     int len)

Continues a multiple-part encryption or decryption operation (depending on how this cipher was initialized), processing another data part.

The first len bytes in the b input buffer, starting at off offset inclusive, are processed, and the result is stored in a new buffer.

Parameters:

b - the input buffer

off - the offset in b where the input starts

len - the input length

Returns:

the new buffer with the result

doFinal

public byte[] doFinal()

Finishes a multiple-part encryption or decryption operation, depending on how this cipher was initialized and resets underlying cipher object to the state it was in when previously initialized via a call to init.

Returns:

final bytes array