Jasypt offers support for performing PBE (Password Based Encryption) operations on texts. This is offered through the org.jasypt.encryption.pbe.PBEStringEncryptor interface and its default implementation, org.jasypt.encryption.pbe.StandardPBEStringEncryptor.
Jasypt uses the byte (binary) encryption mechanisms as a basis for text encryption, with the following specificity:
Assuming that you will be using the default implementation, once the StandardPBEStringEncryptor instance has been created, this is how it will work:
The algorithm, password and key-obtention iterations can take values in any of these ways:
And the actual values to be used for initialization will be established by applying the following priorities:
Before it is ready to encrypt, an object of this class has to be initialised. Initialisation happens:
An encryptor may be used for:
When using a random salt generator, two encryption results for the same message will always be different (except in the case of random salt coincidence). This enforces security by difficulting brute force attacks on sets of data at a time and forcing attackers to perform a brute force attack on each separate piece of encrypted data.
To learn more about the mechanisms involved in encryption, read PKCS #5: Password-Based Cryptography Standard.
Easiest use: the BasicTextEncryptor util class:
... BasicTextEncryptor textEncryptor = new BasicTextEncryptor(); textEncryptor.setPassword(myEncryptionPassword); ... String myEncryptedText = textEncryptor.encrypt(myText); ... String plainText = textEncryptor.decrypt(myEncryptedText); ...
More security: the StrongTextEncryptor util class with a much more secure (but slower!) algorithm (you may need to download and install the Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files to use it):
... StrongTextEncryptor textEncryptor = new StrongTextEncryptor(); textEncryptor.setPassword(myEncryptionPassword); ... String myEncryptedText = textEncryptor.encrypt(myText); ... String plainText = textEncryptor.decrypt(myEncryptedText); ...
All these util classes are in fact pre-configured, easy-to-use versions of StandardPBEStringEncryptor, so let's use the original class for total control:
... StandardPBEStringEncryptor encryptor = new StandardPBEStringEncryptor(); encryptor.setPassword("jasypt"); // we HAVE TO set a password encryptor.setAlgorithm("PBEWithMD5AndTripleDES"); // optionally set the algorithm ... String encryptedText = encryptor.encrypt(myText); ... String plainText = encryptor.decrypt(encryptedText); // myText.equals(plainText) ...
And we can even use a pooled version for higher performance in multi-processor/multi-core systems:
... PooledPBEStringEncryptor encryptor = new PooledPBEStringEncryptor(); encryptor.setPoolSize(4); // This would be a good value for a 4-core system encryptor.setPassword("jasypt"); encryptor.setAlgorithm("PBEWithMD5AndTripleDES"); ... String encryptedText = encryptor.encrypt(myText); ...