com.google.crypto.tink.subtle

Class AesCtrJceCipher

java.lang.Object

com.google.crypto.tink.subtle.AesCtrJceCipher

All Implemented Interfaces:

IndCpaCipher

public final class AesCtrJceCipher
extends Object
implements IndCpaCipher

The primitive implements AES counter mode with random IVs, using JCE.

Warning

It is safe against chosen-plaintext attacks, but does not provide ciphertext integrity, thus is unsafe against chosen-ciphertext attacks.

Since:

1.0.0

Field Summary

Fields

Modifier and Type	Field and Description
static TinkFipsUtil.AlgorithmFipsCompatibility	FIPS

Constructor Summary

Constructors

Constructor and Description
AesCtrJceCipher(byte[] key, int ivSize)

Method Summary

Modifier and Type	Method and Description
byte[]	decrypt(byte[] ciphertext) Decrypts the ciphertext with counter mode decryption.
byte[]	encrypt(byte[] plaintext) Encrypts the plaintext with counter mode encryption using randomly generated iv.

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

AesCtrJceCipher

public AesCtrJceCipher(byte[] key,
                       int ivSize)
                throws GeneralSecurityException

Throws:

GeneralSecurityException

Method Detail

encrypt

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

Encrypts the plaintext with counter mode encryption using randomly generated iv. The output format is iv || raw ciphertext.

Specified by:

encrypt in interface IndCpaCipher

Parameters:

plaintext - the plaintext to be encrypted.

Returns:

the encryption of plaintext.

Throws:

GeneralSecurityException

decrypt

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

Decrypts the ciphertext with counter mode decryption. The ciphertext format is iv || raw ciphertext.

Specified by:

decrypt in interface IndCpaCipher

Parameters:

ciphertext - the ciphertext to be decrypted.

Returns:

the decrypted plaintext.

Throws:

GeneralSecurityException