AesGcmDecryptor

java.lang.Object
- com.itextpdf.kernel.crypto.AesGcmDecryptor

All Implemented Interfaces:

IDecryptor
```
public class AesGcmDecryptor
extends java.lang.Object
implements IDecryptor
```
Class for decrypting aes-gcm encrypted bytes.

Field Summary

Fields
Modifier and Type Field Description

private AESGCMCipher cipher

private boolean initiated

private byte[] iv

private int ivptr

private byte[] key

Constructor Summary

Constructors
Constructor Description

AesGcmDecryptor(byte[] key, int off, int len)
Creates a new instance of AesGcmDecryptor.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`byte[]`	`finish()`	Finishes a multiple-part decryption operation.
`byte[]`	`update(byte[] b, int off, int len)`	Continues a multiple-part decryption operation, processing another data part and initializing aes-gcm cipher if this method called for the first time.

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

- Field Detail
  - cipher
```
private AESGCMCipher cipher
```
  - key
```
private final byte[] key
```
  - initiated
```
private boolean initiated
```
  - iv
```
private final byte[] iv
```
  - ivptr
```
private int ivptr
```
- Constructor Detail
  - AesGcmDecryptor
```
public AesGcmDecryptor(byte[] key,
                       int off,
                       int len)
```
    Creates a new instance of AesGcmDecryptor.
    
    Parameters:
    
    key - the byte array containing the key for decryption
    
    off - offset of the key in the byte array
    
    len - the length of the key in the byte array
- Method Detail
  - update
```
public byte[] update(byte[] b,
                     int off,
                     int len)
```
    Continues a multiple-part decryption operation, processing another data part and initializing aes-gcm cipher if this method called for the first time.
    
    Specified by:
    
    update in interface IDecryptor
    
    Parameters:
    
    b - the input buffer
    
    off - the offset in input where the input starts
    
    len - the input length
    
    Returns:
    
    decrypted bytes array
  - finish
```
public byte[] finish()
```
    Finishes a multiple-part decryption operation.
    
    Specified by:
    
    finish in interface IDecryptor
    
    Returns:
    
    input data that may have been buffered during a previous update operation