Package in.dragonbra.javasteam.util.crypto

Class CryptoHelper

java.lang.Object

in.dragonbra.javasteam.util.crypto.CryptoHelper

public class CryptoHelper
extends java.lang.Object

Since:

2018-02-24

Field Summary

Fields

Modifier and Type	Field	Description
static java.lang.String	SEC_PROV

Constructor Summary

Constructors

Constructor	Description
CryptoHelper()

Method Summary

Modifier and Type	Method	Description
static byte[]	crcHash(byte[] input)	Performs CRC32 on an input byte array using the CrcStandard.Crc32Bit parameters
static byte[]	generateRandomBlock(int size)	Generate an array of random bytes given the input length
static byte[]	symmetricDecrypt(byte[] input, byte[] key)	Decrypts using AES/CBC/PKCS7 with an input byte array and key, using the random IV prepended using AES/ECB/None
static byte[]	symmetricDecrypt(byte[] input, byte[] key, Passable<byte[]> iv)	Decrypts using AES/CBC/PKCS7 with an input byte array and key, using the random IV prepended using AES/ECB/None
static byte[]	symmetricDecryptHMACIV(byte[] input, byte[] key, byte[] hmacSecret)	Decrypts using AES/CBC/PKCS7 with an input byte array and key, using the IV (comprised of random bytes and the HMAC-SHA1 of the random bytes and plaintext) prepended using AES/ECB/None
static byte[]	symmetricEncrypt(byte[] input, byte[] key)	Performs an encryption using AES/CBC/PKCS7 with an input byte array and key, with a random IV prepended using AES/ECB/None
static byte[]	symmetricEncryptWithHMACIV(byte[] input, byte[] key, byte[] hmacSecret)	Performs an encryption using AES/CBC/PKCS7 with an input byte array and key, with a IV (comprised of random bytes and the HMAC-SHA1 of the random bytes and plaintext) prepended using AES/ECB/None
static byte[]	symmetricEncryptWithIV(byte[] input, byte[] key, byte[] iv)	Performs an encryption using AES/CBC/PKCS7 with an input byte array and key, with a random IV prepended using AES/ECB/None

Methods inherited from class java.lang.Object

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

Field Detail

SEC_PROV

public static final java.lang.String SEC_PROV

Constructor Detail

CryptoHelper

public CryptoHelper()

Method Detail

generateRandomBlock

public static byte[] generateRandomBlock(int size)

Generate an array of random bytes given the input length

Parameters:

size - the size of the block to generate

Returns:

the generated block

crcHash

public static byte[] crcHash(byte[] input)

Performs CRC32 on an input byte array using the CrcStandard.Crc32Bit parameters

Parameters:

input - array to hash

Returns:

the hashed result

symmetricDecrypt

public static byte[] symmetricDecrypt(byte[] input,
                                      byte[] key)
                               throws CryptoException

Decrypts using AES/CBC/PKCS7 with an input byte array and key, using the random IV prepended using AES/ECB/None

Parameters:

input - array to decrypt

key - encryption key

Returns:

decrypted message

Throws:

CryptoException - deception while encrypting

symmetricDecrypt

public static byte[] symmetricDecrypt(byte[] input,
                                      byte[] key,
                                      Passable<byte[]> iv)
                               throws CryptoException

Decrypts using AES/CBC/PKCS7 with an input byte array and key, using the random IV prepended using AES/ECB/None

Parameters:

input - array to decrypt

key - encryption key

iv - the random IV

Returns:

decrypted message

Throws:

CryptoException - deception while encrypting

symmetricEncryptWithIV

public static byte[] symmetricEncryptWithIV(byte[] input,
                                            byte[] key,
                                            byte[] iv)
                                     throws CryptoException

Performs an encryption using AES/CBC/PKCS7 with an input byte array and key, with a random IV prepended using AES/ECB/None

Parameters:

input - array to encrypt

key - encryption key

iv - the random IV

Returns:

encrypted message

Throws:

CryptoException - exception while encrypting

symmetricEncrypt

public static byte[] symmetricEncrypt(byte[] input,
                                      byte[] key)
                               throws CryptoException

Performs an encryption using AES/CBC/PKCS7 with an input byte array and key, with a random IV prepended using AES/ECB/None

Parameters:

input - array to encrypt

key - encryption key

Returns:

encrypted message

Throws:

CryptoException - exception while encrypting

symmetricDecryptHMACIV

public static byte[] symmetricDecryptHMACIV(byte[] input,
                                            byte[] key,
                                            byte[] hmacSecret)
                                     throws CryptoException

Decrypts using AES/CBC/PKCS7 with an input byte array and key, using the IV (comprised of random bytes and the HMAC-SHA1 of the random bytes and plaintext) prepended using AES/ECB/None

Parameters:

input - array to decrypt

key - encryption key

hmacSecret - the IV

Returns:

decrypted message

Throws:

CryptoException - exception while decrypting

symmetricEncryptWithHMACIV

public static byte[] symmetricEncryptWithHMACIV(byte[] input,
                                                byte[] key,
                                                byte[] hmacSecret)
                                         throws CryptoException

Performs an encryption using AES/CBC/PKCS7 with an input byte array and key, with a IV (comprised of random bytes and the HMAC-SHA1 of the random bytes and plaintext) prepended using AES/ECB/None

Parameters:

input - array to encrypt

key - encryption key

hmacSecret - the IV

Returns:

encrypted message

Throws:

CryptoException - exception while encrypting