public class KeyUtil extends Object
Refer to the Java Cryptography Extension Reference Guide at to determine which parameters are best for key algorithm, key size and cipher; although "AES", 128 and "AES" should be good enough in most cases.
| Constructor and Description |
|---|
KeyUtil() |
| Modifier and Type | Method and Description |
|---|---|
static byte[] |
decrypt(SecretKey key,
String cipherParams,
byte[] message)
Decrypt a message using a symmetric key
|
static byte[] |
encrypt(SecretKey key,
String cipherParams,
byte[] message)
Encrypt a message using a symmetric key
|
static SecretKey |
generateKey(String algorithm,
int size)
Generates a secret symmetric key
|
static SecureRandom |
getSecureRandom() |
public static SecureRandom getSecureRandom()
public static SecretKey generateKey(String algorithm, int size) throws KeyException
algorithm - algorithm used for key generation, ie AESsize - size of the generated key, must be one of 128, 192, 256. Use 128 when unsure,
default configurations and providers should refuse to use longer keys.KeyException - key generation or saving failedpublic static byte[] encrypt(SecretKey key, String cipherParams, byte[] message) throws KeyException
key - secret key used for encryptioncipherParams - cipher parameters: transformations, ie AESmessage - the message to encryptKeyException - encryption failed, public key recovery failedpublic static byte[] decrypt(SecretKey key, String cipherParams, byte[] message) throws KeyException
key - secret key used for decryptioncipherParams - cipher parameters: transformations, ie AESmessage - the encrypted messageKeyException - private key recovery failed, decryption failed