Package io.keyko.common.helpers

Class CryptoHelper

java.lang.Object

io.keyko.common.helpers.CryptoHelper

public abstract class CryptoHelper
extends Object

Helper abstract class with crypto utility methods

Field Summary

Fields

Modifier and Type	Field	Description
static String	DEFAULT_ALGORITHM
static int	DEFAULT_KEY_SIZE
private static char[]	DIGITS	The Constant DIGITS.
private static BigInteger	MASK_256

Constructor Summary

Constructors

Constructor	Description
CryptoHelper()

Method Summary

Modifier and Type	Method	Description
static byte[]	decrypt(byte[] privateKey, byte[] inputData)	Given a private key and some encrypted data tries to decrypt the data using the private key
static byte[]	decrypt(byte[] privateKey, byte[] inputData, String algorithm)	Given a private key and some encrypted data tries to decrypt the data using the private key
static byte[]	encrypt(byte[] publicKey, byte[] inputData)	Given a public key and input data encrypts the input data using the public key.
static byte[]	encrypt(byte[] publicKey, byte[] inputData, String algorithm)	Given a public key and input data encrypts the input data using the public key.
static KeyPair	generateECSDAKeyPair()	Generates a KeyPair
static KeyPair	generateKeyPair()	Generates a KeyPair
static KeyPair	generateKeyPair(String algorithm, int keySize)	Generates a ECSDA KeyPair
static String	getHex(byte[] data)	Gets the hex.
static byte[]	keccak256(String input)	Given an input string generates the equivalent to keccak256(abi.encodePacked())
static String	sha3_256(String input)	Given an input string generates the digest SHA3 256 hash
static String	sha3256(String input)	Given an input string return the result of sha3256
static byte[]	soliditySha3(Object... data)	Given N objects, return the SHA3 of those objects
static byte[]	toBytes(Object obj)	Given an object (byte[], BigInteger, Address, Uint or Number) gets the byte[] with the proper length

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_ALGORITHM

public static final String DEFAULT_ALGORITHM

See Also:

Constant Field Values

DEFAULT_KEY_SIZE

public static final int DEFAULT_KEY_SIZE

See Also:

Constant Field Values

DIGITS

private static final char[] DIGITS

The Constant DIGITS.

MASK_256

private static final BigInteger MASK_256

Constructor Detail

CryptoHelper

public CryptoHelper()

Method Detail

encrypt

public static byte[] encrypt(byte[] publicKey,
                             byte[] inputData)
                      throws CryptoException

Given a public key and input data encrypts the input data using the public key. So only the holder of the private key can decrypt the data

Parameters:

publicKey - public key byte[]

inputData - data to encrypt []

Returns:

encrypted bytes

Throws:

CryptoException - Encryption error

encrypt

public static byte[] encrypt(byte[] publicKey,
                             byte[] inputData,
                             String algorithm)
                      throws CryptoException

Given a public key and input data encrypts the input data using the public key. So only the holder of the private key can decrypt the data

Parameters:

publicKey - public key byte[]

inputData - data to encrypt []

algorithm - algorithm to use

Returns:

encrypted bytes

Throws:

CryptoException - Encryption error

decrypt

public static byte[] decrypt(byte[] privateKey,
                             byte[] inputData)
                      throws CryptoException

Given a private key and some encrypted data tries to decrypt the data using the private key

Parameters:

privateKey - private key byte[]

inputData - encrypted input data

Returns:

decrypted data

Throws:

CryptoException - Decryption error

decrypt

public static byte[] decrypt(byte[] privateKey,
                             byte[] inputData,
                             String algorithm)
                      throws CryptoException

Given a private key and some encrypted data tries to decrypt the data using the private key

Parameters:

privateKey - private key byte[]

inputData - encrypted input data

algorithm - algorithm to use

Returns:

decrypted data

Throws:

CryptoException - Decryption error

generateKeyPair

public static KeyPair generateKeyPair()
                               throws CryptoException

Generates a KeyPair

Returns:

KeyPair

Throws:

CryptoException - error generating key pair

generateKeyPair

public static KeyPair generateKeyPair(String algorithm,
                                      int keySize)
                               throws CryptoException

Generates a ECSDA KeyPair

Parameters:

algorithm - Algorithm to use

keySize - key size

Returns:

KeyPair

Throws:

CryptoException - error generating key pair

generateECSDAKeyPair

public static KeyPair generateECSDAKeyPair()
                                    throws CryptoException

Generates a KeyPair

Returns:

KeyPair

Throws:

CryptoException - error generating key pair

sha3_256

public static String sha3_256(String input)

Given an input string generates the digest SHA3 256 hash

Parameters:

input -

Returns:

keccak256

public static byte[] keccak256(String input)

Given an input string generates the equivalent to keccak256(abi.encodePacked())

Parameters:

input -

Returns:

sha3256

public static String sha3256(String input)

Given an input string return the result of sha3256

Parameters:

input - string

Returns:

hashed message

soliditySha3

public static byte[] soliditySha3(Object... data)

Given N objects, return the SHA3 of those objects

Parameters:

data - objects

Returns:

sha3

getHex

public static String getHex(byte[] data)

Gets the hex.

Parameters:

data - the data

Returns:

the hex

toBytes

public static byte[] toBytes(Object obj)

Given an object (byte[], BigInteger, Address, Uint or Number) gets the byte[] with the proper length

Parameters:

obj - the object

Returns:

byte[]