com.google.crypto.tink.subtle

Class AesGcmJce

java.lang.Object

com.google.crypto.tink.subtle.AesGcmJce

All Implemented Interfaces:

Aead

@Immutable
public final class AesGcmJce
extends Object
implements Aead

This primitive implements AesGcm using JCE.

Since:

1.0.0

Field Summary

Fields

Modifier and Type	Field and Description
static TinkFipsUtil.AlgorithmFipsCompatibility	FIPS

Constructor Summary

Constructors

Constructor and Description
AesGcmJce(byte[] key)

Method Summary

Modifier and Type	Method and Description
static Aead	create(AesGcmKey key)
byte[]	decrypt(byte[] ciphertext, byte[] associatedData) Decrypts ciphertext with associatedData as associated authenticated data.
byte[]	encrypt(byte[] plaintext, byte[] associatedData) On Android KitKat (API level 19) this method does not support non null or non empty associatedData.

Methods inherited from class java.lang.Object

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

Field Detail

FIPS

public static final TinkFipsUtil.AlgorithmFipsCompatibility FIPS

Constructor Detail

AesGcmJce

public AesGcmJce(byte[] key)
          throws GeneralSecurityException

Throws:

GeneralSecurityException

Method Detail

create

public static Aead create(AesGcmKey key)
                   throws GeneralSecurityException

Throws:

GeneralSecurityException

encrypt

public byte[] encrypt(byte[] plaintext,
                      byte[] associatedData)
               throws GeneralSecurityException

On Android KitKat (API level 19) this method does not support non null or non empty associatedData. It might not work at all in older versions.

Specified by:

encrypt in interface Aead

Parameters:

plaintext - the plaintext to be encrypted. It must be non-null, but can also be an empty (zero-length) byte array

associatedData - associated data to be authenticated, but not encrypted. Associated data is optional, so this parameter can be null. In this case the null value is equivalent to an empty (zero-length) byte array. For successful decryption the same associatedData must be provided along with the ciphertext.

Returns:

resulting ciphertext

Throws:

GeneralSecurityException

decrypt

public byte[] decrypt(byte[] ciphertext,
                      byte[] associatedData)
               throws GeneralSecurityException

Description copied from interface: Aead

Decrypts ciphertext with associatedData as associated authenticated data. The decryption verifies the authenticity and integrity of the associated data, but there are no guarantees wrt. secrecy of that data.

Specified by:

decrypt in interface Aead

Parameters:

ciphertext - the plaintext to be decrypted. It must be non-null.

associatedData - associated data to be authenticated. For successful decryption it must be the same as associatedData used during encryption. Can be null, which is equivalent to an empty (zero-length) byte array.

Returns:

resulting plaintext

Throws:

GeneralSecurityException - if decryption fails. Decryption must fail if ciphertext is not correctly authenticated for the given associatedData.