nxt.crypto

Class Crypto

java.lang.Object

nxt.crypto.Crypto

public final class Crypto
extends java.lang.Object

Method Summary

Modifier and Type	Method and Description
static byte[]	aesDecrypt(byte[] ivCiphertext, byte[] key)
static byte[]	aesEncrypt(byte[] plaintext, byte[] key)
static byte[]	aesGCMDecrypt(byte[] ivCiphertext, byte[] key)
static byte[]	aesGCMEncrypt(byte[] plaintext, byte[] key)
static void	clamp(byte[] key) Clamping is used to protect a key against common attacks on Ed25519 and Curve25519.
static void	curve(byte[] Z, byte[] k, byte[] P)
static byte[]	getKeySeed(byte[] privateKey, byte[]... nonces)
static java.security.MessageDigest	getMessageDigest(java.lang.String algorithm)
static byte[]	getPrivateKey(byte[] keySeed)
static byte[]	getPrivateKey(java.lang.String secretPhrase)
static byte[]	getPublicKey(byte[] privateKey)
static java.security.SecureRandom	getSecureRandom()
static byte[]	getSharedKey(byte[] myPrivateKey, byte[] theirPublicKey)
static byte[]	getSharedKey(byte[] myPrivateKey, byte[] theirPublicKey, byte[] nonce)
static boolean	isCanonicalPublicKey(byte[] publicKey)
static boolean	isCanonicalSignature(byte[] signature)
static java.security.MessageDigest	ripemd160()
static java.security.MessageDigest	sha256()
static java.security.MessageDigest	sha3()
static byte[]	sign(byte[] message, byte[] privateKey)
static boolean	verify(byte[] signature, byte[] message, byte[] publicKey)

Methods inherited from class java.lang.Object

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

Method Detail

getSecureRandom

public static java.security.SecureRandom getSecureRandom()

getMessageDigest

public static java.security.MessageDigest getMessageDigest(java.lang.String algorithm)

sha256

public static java.security.MessageDigest sha256()

ripemd160

public static java.security.MessageDigest ripemd160()

sha3

public static java.security.MessageDigest sha3()

getKeySeed

public static byte[] getKeySeed(byte[] privateKey,
                                byte[]... nonces)

getPublicKey

public static byte[] getPublicKey(byte[] privateKey)

getPrivateKey

public static byte[] getPrivateKey(byte[] keySeed)

getPrivateKey

public static byte[] getPrivateKey(java.lang.String secretPhrase)

curve

public static void curve(byte[] Z,
                         byte[] k,
                         byte[] P)

sign

public static byte[] sign(byte[] message,
                          byte[] privateKey)

verify

public static boolean verify(byte[] signature,
                             byte[] message,
                             byte[] publicKey)

getSharedKey

public static byte[] getSharedKey(byte[] myPrivateKey,
                                  byte[] theirPublicKey)

getSharedKey

public static byte[] getSharedKey(byte[] myPrivateKey,
                                  byte[] theirPublicKey,
                                  byte[] nonce)

aesEncrypt

public static byte[] aesEncrypt(byte[] plaintext,
                                byte[] key)

aesGCMEncrypt

public static byte[] aesGCMEncrypt(byte[] plaintext,
                                   byte[] key)

aesDecrypt

public static byte[] aesDecrypt(byte[] ivCiphertext,
                                byte[] key)

aesGCMDecrypt

public static byte[] aesGCMDecrypt(byte[] ivCiphertext,
                                   byte[] key)

isCanonicalPublicKey

public static boolean isCanonicalPublicKey(byte[] publicKey)

isCanonicalSignature

public static boolean isCanonicalSignature(byte[] signature)

clamp

public static void clamp(byte[] key)

Clamping is used to protect a key against common attacks on Ed25519 and Curve25519. In our case the lowest 3 bits of the first byte of the key of are cleared, the highest bit of the last byte is cleared, and the second highest bit of the last byte is set.

Parameters:

key - the key to clamp