Package net.lingala.zip4j.crypto

Class AesCipherUtil

java.lang.Object

net.lingala.zip4j.crypto.AesCipherUtil

public class AesCipherUtil
extends java.lang.Object

Field Summary

Fields

Modifier and Type	Field	Description
private static int	START_INDEX

Constructor Summary

Constructors

Constructor	Description
AesCipherUtil()

Method Summary

Modifier and Type	Method	Description
static byte[]	derivePasswordBasedKey(byte[] salt, char[] password, AesKeyStrength aesKeyStrength, boolean useUtf8ForPassword)	Derive Password-Based Key for AES according to AE-1 and AE-2 Specifications
static byte[]	derivePasswordVerifier(byte[] derivedKey, AesKeyStrength aesKeyStrength)	Derive Password Verifier using Derived Key and requested AES Key Strength
static AESEngine	getAESEngine(byte[] derivedKey, AesKeyStrength aesKeyStrength)	Get AES Engine using derived key and requested AES Key Strength
static MacBasedPRF	getMacBasedPRF(byte[] derivedKey, AesKeyStrength aesKeyStrength)	Get MAC-Based PRF using default HMAC Algorithm defined in AE-1 and AE-2 Specification
static void	prepareBuffAESIVBytes(byte[] buff, int nonce)

Methods inherited from class java.lang.Object

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

Field Detail

START_INDEX

private static final int START_INDEX

See Also:

Constant Field Values

Constructor Detail

AesCipherUtil

public AesCipherUtil()

Method Detail

derivePasswordBasedKey

public static byte[] derivePasswordBasedKey(byte[] salt,
                                            char[] password,
                                            AesKeyStrength aesKeyStrength,
                                            boolean useUtf8ForPassword)
                                     throws ZipException

Derive Password-Based Key for AES according to AE-1 and AE-2 Specifications

Parameters:

salt - Salt used for PBKDF2

password - Password used for PBKDF2 containing characters matching ISO-8859-1 character set

aesKeyStrength - Requested AES Key and MAC Strength

Returns:

Derived Password-Based Key

Throws:

ZipException - Thrown when Derived Key is not valid

derivePasswordVerifier

public static byte[] derivePasswordVerifier(byte[] derivedKey,
                                            AesKeyStrength aesKeyStrength)

Derive Password Verifier using Derived Key and requested AES Key Strength

Parameters:

derivedKey - Derived Key

aesKeyStrength - AES Key Strength

Returns:

Derived Password Verifier

getMacBasedPRF

public static MacBasedPRF getMacBasedPRF(byte[] derivedKey,
                                         AesKeyStrength aesKeyStrength)

Get MAC-Based PRF using default HMAC Algorithm defined in AE-1 and AE-2 Specification

Parameters:

derivedKey - Derived Key

aesKeyStrength - AES Key Strength

Returns:

Initialized MAC-Based PRF

getAESEngine

public static AESEngine getAESEngine(byte[] derivedKey,
                                     AesKeyStrength aesKeyStrength)
                              throws ZipException

Get AES Engine using derived key and requested AES Key Strength

Parameters:

derivedKey - Derived Key

aesKeyStrength - AES Key Strength

Returns:

AES Engine configured with AES Key

Throws:

ZipException - Thrown on AESEngine initialization failures

prepareBuffAESIVBytes

public static void prepareBuffAESIVBytes(byte[] buff,
                                         int nonce)