Package at.letto.basespringboot.security

Class BaseCrypto

java.lang.Object

at.letto.basespringboot.security.BaseCrypto

public class BaseCrypto
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
private static final String	ENCRYPTION_ALGO
private static final int	ITERATIONS
private static final int	IV_LENGTH
private static final String	KEY_DERIVATION_FUNCTION
private static final int	KEY_LENGTH
private static final int	SALT_LENGTH

Constructor Summary

Constructors

Constructor	Description
BaseCrypto()

Method Summary

Modifier and Type	Method	Description
static String	decrypt(String encryptedBase64, String password)	Decrypts a Base64-encoded encrypted string using AES decryption with a password.
private static SecretKey	deriveKey(String password, byte[] salt)	Derives a secret key from the given password and salt using PBKDF2.
static String	encrypt(String plainText, String password)	Encrypts a plain text string using AES encryption with a password.
private static byte[]	generateRandomBytes(int length)	Generates a random byte array of the specified length.

Methods inherited from class java.lang.Object

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

Field Details

ENCRYPTION_ALGO

private static final String ENCRYPTION_ALGO

See Also:

• Constant Field Values

KEY_DERIVATION_FUNCTION

private static final String KEY_DERIVATION_FUNCTION

See Also:

• Constant Field Values

KEY_LENGTH

private static final int KEY_LENGTH

See Also:

• Constant Field Values

ITERATIONS

private static final int ITERATIONS

See Also:

• Constant Field Values

SALT_LENGTH

private static final int SALT_LENGTH

See Also:

• Constant Field Values

IV_LENGTH

private static final int IV_LENGTH

See Also:

• Constant Field Values

Constructor Details

BaseCrypto

public BaseCrypto()

Method Details

encrypt

public static String encrypt(String plainText,
 String password)
                      throws Exception

Encrypts a plain text string using AES encryption with a password. The method generates a random salt and IV, derives a key from the password, and returns the encrypted data as a Base64-encoded string.

Parameters:

plainText - the text to encrypt

password - the password used for encryption

Returns:

Base64-encoded encrypted string

Throws:

Exception - if encryption fails

decrypt

public static String decrypt(String encryptedBase64,
 String password)
                      throws Exception

Decrypts a Base64-encoded encrypted string using AES decryption with a password. The method extracts the salt and IV from the encrypted data, derives the key, and returns the decrypted plain text.

Parameters:

encryptedBase64 - the Base64-encoded encrypted string

password - the password used for decryption

Returns:

decrypted plain text string

Throws:

Exception - if decryption fails

deriveKey

private static SecretKey deriveKey(String password,
 byte[] salt)
                            throws Exception

Derives a secret key from the given password and salt using PBKDF2.

Parameters:

password - the password to derive the key from

salt - the salt used in key derivation

Returns:

the derived SecretKey

Throws:

Exception - if key derivation fails

generateRandomBytes

private static byte[] generateRandomBytes(int length)

Generates a random byte array of the specified length.

Parameters:

length - the length of the byte array to generate

Returns:

a byte array filled with random bytes