Examples with CryptoEngine io.nem.symbol.core.crypto.CryptoEngine used on opensource projects

Example 1 with CryptoEngine

use of io.nem.symbol.core.crypto.CryptoEngine in project nem2-sdk-java by nemtech.

the class EncryptedMessage method create.

/**
 * Helper constructor that allow users to easily encrypt a message using the SDK provided {@link
 * CryptoEngine} and {@link BlockCipher}.
 *
 * <p>Note, the strategy to encrypt and decrypt should be shared between the different SDKs. A
 * client may send a transaction using a sdk and the recipient may be using a different one.
 *
 * <p>The strategy is:
 *
 * <p>"plain text" string - utf8 byte array - encrypted byte array - hex string (the encrypted
 * message string)
 *
 * @param plainTextMessage Plain message to be encrypted
 * @param senderPrivateKey Sender private key
 * @param recipientPublicKey Recipient public key
 * @return EncryptedMessage
 */
public static EncryptedMessage create(String plainTextMessage, PrivateKey senderPrivateKey, PublicKey recipientPublicKey) {
    CryptoEngine engine = CryptoEngines.defaultEngine();
    KeyPair sender = KeyPair.fromPrivate(senderPrivateKey);
    KeyPair recipient = KeyPair.onlyPublic(recipientPublicKey, engine);
    BlockCipher blockCipher = engine.createBlockCipher(sender, recipient);
    return new EncryptedMessage(ConvertUtils.toHex(blockCipher.encrypt(StringEncoder.getBytes(plainTextMessage))));
}

Example 2 with CryptoEngine

use of io.nem.symbol.core.crypto.CryptoEngine in project nem2-sdk-java by nemtech.

the class Ed25519DsaSignerTest method signReturnsExpectedSignature.

@Test
public void signReturnsExpectedSignature() {
    // Arrange:
    final CryptoEngine engine = this.getCryptoEngine();
    final KeyPair keyPair = KeyPair.random(engine);
    for (int i = 0; i < 20; i++) {
        final DsaSigner dsaSigner = this.getDsaSigner(keyPair);
        final byte[] input = RandomUtils.generateRandomBytes();
        // Act:
        final Signature signature1 = dsaSigner.sign(input);
        final Signature signature2 = MathUtils.sign(keyPair, input);
        // Assert:
        Assertions.assertEquals(signature1, signature2);
    }
}

Example 3 with CryptoEngine

use of io.nem.symbol.core.crypto.CryptoEngine in project nem2-sdk-java by nemtech.

the class Ed25519DsaSignerTest method makeCanonicalMakesNonCanonicalSignatureCanonical.

@Test
public void makeCanonicalMakesNonCanonicalSignatureCanonical() {
    // Arrange:
    final CryptoEngine engine = this.getCryptoEngine();
    final KeyPair kp = KeyPair.random(engine);
    final DsaSigner dsaSigner = this.getDsaSigner(kp);
    final byte[] input = RandomUtils.generateRandomBytes();
    // Act:
    final Signature signature = dsaSigner.sign(input);
    final BigInteger nonCanonicalS = engine.getCurve().getGroupOrder().add(signature.getS());
    final Signature nonCanonicalSignature = new Signature(signature.getR(), nonCanonicalS);
    Assertions.assertFalse(dsaSigner.isCanonicalSignature(nonCanonicalSignature));
    final Signature canonicalSignature = dsaSigner.makeSignatureCanonical(nonCanonicalSignature);
    // Assert:
    Assertions.assertTrue(dsaSigner.isCanonicalSignature(canonicalSignature));
}

Example 4 with CryptoEngine

use of io.nem.symbol.core.crypto.CryptoEngine in project nem2-sdk-java by nemtech.

the class Ed25519DsaSignerTest method replacingRWithGroupOrderPlusRInSignatureRuinsSignature.

@Test
public void replacingRWithGroupOrderPlusRInSignatureRuinsSignature() {
    // Arrange:
    final CryptoEngine engine = this.getCryptoEngine();
    final BigInteger groupOrder = engine.getCurve().getGroupOrder();
    final KeyPair kp = KeyPair.random(engine);
    final DsaSigner dsaSigner = this.getDsaSigner(kp);
    Signature signature;
    byte[] input;
    while (true) {
        input = RandomUtils.generateRandomBytes();
        signature = dsaSigner.sign(input);
        if (signature.getR().add(groupOrder).compareTo(BigInteger.ONE.shiftLeft(256)) < 0) {
            break;
        }
    }
    // Act:
    final Signature signature2 = new Signature(groupOrder.add(signature.getR()), signature.getS());
    // Assert:
    Assertions.assertFalse(dsaSigner.verify(input, signature2));
}

Example 5 with CryptoEngine

use of io.nem.symbol.core.crypto.CryptoEngine in project nem2-sdk-java by nemtech.

the class Ed25519DsaSignerTest method verifyReturnsFalseIfPublicKeyIsZeroArray.

@Test
public void verifyReturnsFalseIfPublicKeyIsZeroArray() {
    // Arrange:
    final CryptoEngine engine = this.getCryptoEngine();
    final KeyPair kp = KeyPair.random(engine);
    final DsaSigner dsaSigner = this.getDsaSigner(kp);
    final byte[] input = RandomUtils.generateRandomBytes();
    final Signature signature = dsaSigner.sign(input);
    final Ed25519DsaSigner dsaSignerWithZeroArrayPublicKey = Mockito.mock(Ed25519DsaSigner.class);
    final KeyPair keyPairWithZeroArrayPublicKey = Mockito.mock(KeyPair.class);
    Mockito.when(dsaSignerWithZeroArrayPublicKey.getKeyPair()).thenReturn(keyPairWithZeroArrayPublicKey);
    Mockito.when(keyPairWithZeroArrayPublicKey.getPublicKey()).thenReturn(new PublicKey(new byte[32]));
    Mockito.when(dsaSignerWithZeroArrayPublicKey.verify(input, signature)).thenCallRealMethod();
    Mockito.when(dsaSignerWithZeroArrayPublicKey.isCanonicalSignature(signature)).thenReturn(true);
    // Act:
    final boolean result = dsaSignerWithZeroArrayPublicKey.verify(input, signature);
    // Assert (getKeyPair() would be called more than once if it got beyond the
    // second check):
    Assertions.assertFalse(result);
    Mockito.verify(dsaSignerWithZeroArrayPublicKey, Mockito.times(1)).isCanonicalSignature(signature);
    Mockito.verify(dsaSignerWithZeroArrayPublicKey, Mockito.times(1)).getKeyPair();
}