Package hu.icellmobilsoft.coffee.tool.utils.crypto

Class AesGcmUtil

java.lang.Object

hu.icellmobilsoft.coffee.tool.utils.crypto.AesGcmUtil

public class AesGcmUtil
extends Object

Util class for AES/GCM/NoPadding encode/decode

Since:

1.1.0

Author:

mark.petrenyi

Field Summary

Fields

Modifier and Type	Field	Description
static byte[]	DEFAULT_IV	Default Initialization Vector (IV) buffer

Constructor Summary

Constructors

Constructor	Description
AesGcmUtil()	Default constructor, constructs a new object.

Method Summary

Modifier and Type	Method	Description
static byte[]	decryptWithAes256GcmNoPadding(byte[] oneTimeKey, byte[] encryptedBytes)	AES-256 decrypting (GCM, NoPadding) with one time key (Since the default IV is used, the key must NOT be reused!)
static byte[]	decryptWithAes256GcmNoPadding(byte[] key, byte[] encryptedBytes, byte[] iv)	AES-256 decrypting (GCM, NoPadding)
static byte[]	encryptWithAes256GcmNoPadding(byte[] oneTimeKey, byte[] plainText)	AES-256 encrypting (GCM, NoPadding) with one time key (Since the default IV is used, the key must NOT be reused!)
static byte[]	encryptWithAes256GcmNoPadding(byte[] key, byte[] plainText, byte[] iv)	AES-256 encrypting (GCM, NoPadding)
static byte[]	generateIv()	Generates a secure random 12 byte length iv
static byte[]	generateKey()	Generates a secure random 256 bit length key

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_IV

public static final byte[] DEFAULT_IV

Default Initialization Vector (IV) buffer

Constructor Detail

AesGcmUtil

public AesGcmUtil()

Default constructor, constructs a new object.

Method Detail

generateKey

public static byte[] generateKey()

Generates a secure random 256 bit length key

Returns:

random secure key as byte array

generateIv

public static byte[] generateIv()

Generates a secure random 12 byte length iv

Returns:

random secure key as byte array

encryptWithAes256GcmNoPadding

public static byte[] encryptWithAes256GcmNoPadding(byte[] oneTimeKey,
                                                   byte[] plainText)
                                            throws hu.icellmobilsoft.coffee.dto.exception.BaseException

AES-256 encrypting (GCM, NoPadding) with one time key (Since the default IV is used, the key must NOT be reused!)

Parameters:

oneTimeKey - - one time key used for encryption

plainText - - byte array to encrypt

Returns:

the encrypted data as byte array

Throws:

hu.icellmobilsoft.coffee.dto.exception.BaseException - exception

encryptWithAes256GcmNoPadding

public static byte[] encryptWithAes256GcmNoPadding(byte[] key,
                                                   byte[] plainText,
                                                   byte[] iv)
                                            throws hu.icellmobilsoft.coffee.dto.exception.BaseException

AES-256 encrypting (GCM, NoPadding)

Parameters:

key - - key used for encryption

plainText - - byte array to encrypt

iv - - initialization vector (NEVER use the same key-iv pair more than once)

Returns:

the encrypted data as byte array

Throws:

hu.icellmobilsoft.coffee.dto.exception.BaseException - exception

decryptWithAes256GcmNoPadding

public static byte[] decryptWithAes256GcmNoPadding(byte[] oneTimeKey,
                                                   byte[] encryptedBytes)
                                            throws hu.icellmobilsoft.coffee.dto.exception.BaseException

AES-256 decrypting (GCM, NoPadding) with one time key (Since the default IV is used, the key must NOT be reused!)

Parameters:

oneTimeKey - - one time key used for decrypting

encryptedBytes - - byte array to decrypt

Returns:

decrypted data as byte array

Throws:

hu.icellmobilsoft.coffee.dto.exception.BaseException - exception

decryptWithAes256GcmNoPadding

public static byte[] decryptWithAes256GcmNoPadding(byte[] key,
                                                   byte[] encryptedBytes,
                                                   byte[] iv)
                                            throws hu.icellmobilsoft.coffee.dto.exception.BaseException

AES-256 decrypting (GCM, NoPadding)

Parameters:

key - - key used for decrypting

encryptedBytes - - byte array to decrypt

iv - - initialization vector

Returns:

decrypted data as byte array

Throws:

hu.icellmobilsoft.coffee.dto.exception.BaseException - exception