org.springframework.security.crypto.encrypt

Class Encryptors

java.lang.Object

org.springframework.security.crypto.encrypt.Encryptors

public class Encryptors
extends Object

Factory for commonly used encryptors. Defines the public API for constructing BytesEncryptor and TextEncryptor implementations.

Method Summary

Methods

Modifier and Type	Method and Description
static TextEncryptor	noOpText() Creates a text encryptor that performs no encryption.
static TextEncryptor	queryableText(CharSequence password, CharSequence salt) Creates an encryptor for queryable text strings that uses standard password-based encryption.
static BytesEncryptor	standard(CharSequence password, CharSequence salt) Creates a standard password-based bytes encryptor using 256 bit AES encryption.
static TextEncryptor	text(CharSequence password, CharSequence salt) Creates a text encryptor that uses standard password-based encryption.

Methods inherited from class java.lang.Object

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

Method Detail

standard

public static BytesEncryptor standard(CharSequence password,
                      CharSequence salt)

Creates a standard password-based bytes encryptor using 256 bit AES encryption. Derives the secret key using PKCS #5's PBKDF2 (Password-Based Key Derivation Function #2). Salts the password to prevent dictionary attacks against the key. The provided salt is expected to be hex-encoded; it should be random and at least 8 bytes in length. Also applies a random 16 byte initialization vector to ensure each encrypted message will be unique. Requires Java 6.

Parameters:

password - the password used to generate the encryptor's secret key; should not be shared

salt - a hex-encoded, random, site-global salt value to use to generate the key

text

public static TextEncryptor text(CharSequence password,
                 CharSequence salt)

Creates a text encryptor that uses standard password-based encryption. Encrypted text is hex-encoded.

Parameters:

password - the password used to generate the encryptor's secret key; should not be shared

queryableText

public static TextEncryptor queryableText(CharSequence password,
                          CharSequence salt)

Creates an encryptor for queryable text strings that uses standard password-based encryption. Uses a 16-byte all-zero initialization vector so encrypting the same data results in the same encryption result. This is done to allow encrypted data to be queried against. Encrypted text is hex-encoded.

Parameters:

password - the password used to generate the encryptor's secret key; should not be shared

salt - a hex-encoded, random, site-global salt value to use to generate the secret key

noOpText

public static TextEncryptor noOpText()

Creates a text encryptor that performs no encryption. Useful for developer testing environments where working with plain text strings is desired for simplicity.