### Question:
Crypto { public static boolean isCanonicalPublicKey(byte[] publicKey) { return Curve25519.isCanonicalPublicKey(publicKey); } private  Crypto(); static SecureRandom getSecureRandom(); static MessageDigest getMessageDigest(String algorithm); static MessageDigest sha256(); static MessageDigest sha512(); static MessageDigest ripemd160(); static MessageDigest sha3(); static byte[] getKeySeed(String secretPhrase, byte[]... nonces); static byte[] getKeySeed(byte[] secretBytes, byte[]... nonces); static byte[] getPublicKey(byte[] keySeed); static byte[] getPublicKey(String secretPhrase); static byte[] getPrivateKey(byte[] keySeed); static byte[] getPrivateKey(String secretPhrase); static void curve(byte[] Z, byte[] k, byte[] P); static byte[] sign(byte[] message, String secretPhrase); static byte[] sign(byte[] message, byte[] keySeed); static boolean verify(byte[] signature, byte[] message, byte[] publicKey); static byte[] getSharedKey(byte[] myPrivateKey, byte[] theirPublicKey); static byte[] getSharedKey(byte[] myPrivateKey, byte[] theirPublicKey, byte[] nonce); static byte[] aesEncrypt(byte[] plaintext, byte[] key); static byte[] aesGCMEncrypt(byte[] plaintext, byte[] key); static byte[] aesDecrypt(byte[] ivCiphertext, byte[] key); static byte[] aesGCMDecrypt(byte[] ivCiphertext, byte[] key); static String rsEncode(long id); static long rsDecode(String rsString); static boolean isCanonicalPublicKey(byte[] publicKey); static boolean isCanonicalSignature(byte[] signature); static FBElGamalKeyPair getElGamalKeyPair(); static String elGamalDecrypt(String cryptogramm, FBElGamalKeyPair keyPair); static String elGamalEncrypt(String plainText, FBElGamalKeyPair keyPair);  }### Answer:
@Test public void testIsCanonicalPublicKey() { byte[] publicKey = Crypto.getPublicKey(secretPhraseA); boolean expResult = true; boolean result = Crypto.isCanonicalPublicKey(publicKey); assertEquals(expResult, result); }