io.inbot.utils

Class AESUtils

java.lang.Object

io.inbot.utils.AESUtils

public class AESUtils
extends Object

Helper methods to assist with encryption/decryption using AES that implements https://tools.ietf.org/html/rfc2898 style encryption/decryption with some sane defaults. The plaintext is encrypted with a secure random salt so that every encrypted value is unique. You can choose between using your own 256 bit key or using a salt + password from which a 256 bit key is constructed using PBKDF2WithHmacSHA1. The encrypted value includes a md5 content hash that is used by the decrypt to verify the value is correct. This guarantees the decrypt fails with an IllegalArgumentException if the key/password is incorrect and prevents the algorithm from returning random garbage instead.

Constructor Summary

Constructors

Constructor and Description
AESUtils()

Method Summary

Modifier and Type	Method and Description
static String	byteArrayToHexString(byte[] bytes)
static String	decrypt(byte[] key256Bits, String encrypted) Decrypt text that was encrypted with the provided encrypt method in this class.
static String	decrypt(String keyBase64, String encrypted) Decrypt text that was encrypted with the provided encrypt method in this class.
static String	decrypt(String salt, String password, String input) Decrypt text that was encrypted with the provided encrypt method in this class.
static String	encrypt(byte[] key256Bits, String plainText) Encrypt the plain text.
static String	encrypt(String key, String plainText) Encrypt the plain text.
static String	encrypt(String salt, String password, String plainText) Encrypt the plain text.
static String	generateAesKey()
static byte[]	hexStringToByteArray(String s)

Methods inherited from class java.lang.Object

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

Constructor Detail

AESUtils

public AESUtils()

Method Detail

generateAesKey

public static String generateAesKey()

decrypt

public static String decrypt(String salt,
                             String password,
                             String input)

Decrypt text that was encrypted with the provided encrypt method in this class.

Parameters:

salt - salt is used together with the password to construct a 256 bit SecretKey

password - the password

input - the iv as a hex string followed by '$' followed by the encrypted text

Returns:

plain text.

decrypt

public static String decrypt(byte[] key256Bits,
                             String encrypted)

Decrypt text that was encrypted with the provided encrypt method in this class.

Parameters:

key256Bits - 256 bit key

encrypted - encrypted text

Returns:

plain text

decrypt

public static String decrypt(String keyBase64,
                             String encrypted)

Decrypt text that was encrypted with the provided encrypt method in this class.

Parameters:

keyBase64 - 256 bit key base64 encoded

encrypted - encrypted text

Returns:

plain text

encrypt

public static String encrypt(byte[] key256Bits,
                             String plainText)

Encrypt the plain text.

Parameters:

key256Bits - 256 bit key

plainText - text that needs to be encrypted

Returns:

the iv as a hex string followed by '$' followed by the encrypted text.

encrypt

public static String encrypt(String key,
                             String plainText)

Encrypt the plain text.

Parameters:

key - 256 bit key base64 encoded

plainText - text that needs to be encrypted

Returns:

the iv as a hex string followed by '$' followed by the encrypted text.

encrypt

public static String encrypt(String salt,
                             String password,
                             String plainText)

Encrypt the plain text.

Parameters:

salt - salt is used together with the password to construct a 256 bit SecretKey

password - the secret key

plainText - unencrypted text

Returns:

the iv as a hex string followed by '$' followed by the encrypted text.

hexStringToByteArray

public static byte[] hexStringToByteArray(String s)

byteArrayToHexString

public static String byteArrayToHexString(byte[] bytes)