Package convex.core.crypto

Class Symmetric

java.lang.Object

convex.core.crypto.Symmetric

public class Symmetric
extends Object

Class providing symmetric encryption functionality using AES

Constructor Summary

Constructors

Constructor	Description
Symmetric()

Method Summary

Modifier and Type	Method	Description
static SecretKey	createSecretKey()	Creates an AES secret key
static byte[]	decrypt(SecretKey key, byte[] encryptedData)	Decrypts AES ciphertext with a given secret key.
static byte[]	decrypt(SecretKey key, InputStream bis)	Decrypts AES ciphertext with a given secret key.
static String	decryptString(SecretKey key, byte[] encryptedData)	Decrypts a string from ciphertext, assuming UTF-8 format data
static byte[]	encrypt(SecretKey key, byte[] data)	Encrypt bytes with a given AES SecretKey Prepends the IV to the ciphertext.
static byte[]	encrypt(SecretKey key, String data)	Encrypts a String with a given AES secret key, using standard UTF-8 encoding

Methods inherited from class java.lang.Object

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

Constructor Details

Symmetric

public Symmetric()

Method Details

encrypt

public static byte[] encrypt(SecretKey key,
 String data)

Encrypts a String with a given AES secret key, using standard UTF-8 encoding

Parameters:

key - AES secret key

data - String to encrypt

Returns:

Encrypted representation of the given string

encrypt

public static byte[] encrypt(SecretKey key,
 byte[] data)

Encrypt bytes with a given AES SecretKey Prepends the IV to the ciphertext.

Parameters:

key - Secret encryption key

data - Data to encrypt

Returns:

Encrypted representation of the given byte array data

decryptString

public static String decryptString(SecretKey key,
 byte[] encryptedData)

Decrypts a string from ciphertext, assuming UTF-8 format data

Parameters:

key - AES Secret Key

encryptedData - encrypted byte[] data to decrypt (ciphertext)

Returns:

The decrypted String

decrypt

public static byte[] decrypt(SecretKey key,
 byte[] encryptedData)

Decrypts AES ciphertext with a given secret key. IV is assumed to be prepended to the cipherText

Parameters:

key - Secret encryption key

encryptedData - Encrypted data to decrypt

Returns:

A new byte array containing the decrypted data

decrypt

public static byte[] decrypt(SecretKey key,
 InputStream bis)
                      throws IOException

Decrypts AES ciphertext with a given secret key. IV is assumed to be prepended to the cipherText

Parameters:

key - Secret encryption key

bis - InputStream of data to decrypt

Returns:

A new byte array containing the decrypted data

Throws:

IOException - If an IO error occurs

createSecretKey

public static SecretKey createSecretKey()

Creates an AES secret key

Returns:

The generated SecretKey