Java ECDHBasicAgreement.init方法代码示例

import org.bouncycastle.crypto.agreement.ECDHBasicAgreement; //导入方法依赖的package包/类
/**
 * Generate a shared AES key using ECDH.
 */
public static byte[] generateSharedSecret(byte[] privateKey, byte[] publicKey) {
  try {
    ECNamedCurveParameterSpec spec = ECNamedCurveTable.getParameterSpec(SECP256K1);
    ECDomainParameters domain =
        new ECDomainParameters(spec.getCurve(), spec.getG(), spec.getN(), spec.getH());
    ECPublicKeyParameters pubKey =
        new ECPublicKeyParameters(spec.getCurve().decodePoint(publicKey), domain);
    ECPrivateKeyParameters prvkey =
        new ECPrivateKeyParameters(new BigInteger(1, privateKey), domain);

    ECDHBasicAgreement agreement = new ECDHBasicAgreement();
    agreement.init(prvkey);
    byte[] password = agreement.calculateAgreement(pubKey).toByteArray();

    return Aes.generateKey(ByteUtilities.toHexString(password), password);

  } catch (Exception e) {
    LOGGER.error(null, e);
    return new byte[0];
  }
}
 

import org.bouncycastle.crypto.agreement.ECDHBasicAgreement; //导入方法依赖的package包/类
@Test
public void curveTest() {
    final X9ECParameters curve = NISTNamedCurves.getByName("P-384");
    final ECDomainParameters domainParameters = new ECDomainParameters(
            curve.getCurve(), curve.getG(), curve.getN());
    final SecureRandom random = new SecureRandom();
    final ECKeyPairGenerator gen = new ECKeyPairGenerator();
    gen.init(new ECKeyGenerationParameters(domainParameters, random));
    final AsymmetricCipherKeyPair senderPair = gen.generateKeyPair();
    final AsymmetricCipherKeyPair receiverPair = gen.generateKeyPair();
    final ECDHBasicAgreement senderAgreement = new ECDHBasicAgreement();
    senderAgreement.init(senderPair.getPrivate());
    final BigInteger senderResult = senderAgreement.calculateAgreement(
            receiverPair.getPublic());
    final ECDHBasicAgreement receiverAgreement = new ECDHBasicAgreement();
    receiverAgreement.init(receiverPair.getPrivate());
    final BigInteger receiverResult = receiverAgreement.calculateAgreement(
            senderPair.getPublic());
    assertEquals(senderResult, receiverResult);
    //System.out.println(receiverResult);
}
 

import org.bouncycastle.crypto.agreement.ECDHBasicAgreement; //导入方法依赖的package包/类
public static byte[] calculateECDHBasicAgreement(ECPublicKeyParameters publicKey, ECPrivateKeyParameters privateKey)
{

    ECDHBasicAgreement basicAgreement = new ECDHBasicAgreement();
    basicAgreement.init(privateKey);
    BigInteger agreementValue = basicAgreement.calculateAgreement(publicKey);

    /*
     * RFC 4492 5.10. Note that this octet string (Z in IEEE 1363 terminology) as output by
     * FE2OSP, the Field Element to Octet String Conversion Primitive, has constant length for
     * any given field; leading zeros found in this octet string MUST NOT be truncated.
     */
    return BigIntegers.asUnsignedByteArray(basicAgreement.getFieldSize(), agreementValue);
}
 

import org.bouncycastle.crypto.agreement.ECDHBasicAgreement; //导入方法依赖的package包/类
public static byte[] calculateECDHBasicAgreement(ECPublicKeyParameters publicKey, ECPrivateKeyParameters privateKey)
{
    ECDHBasicAgreement basicAgreement = new ECDHBasicAgreement();
    basicAgreement.init(privateKey);
    BigInteger agreementValue = basicAgreement.calculateAgreement(publicKey);

    /*
     * RFC 4492 5.10. Note that this octet string (Z in IEEE 1363 terminology) as output by
     * FE2OSP, the Field Element to Octet String Conversion Primitive, has constant length for
     * any given field; leading zeros found in this octet string MUST NOT be truncated.
     */
    return BigIntegers.asUnsignedByteArray(basicAgreement.getFieldSize(), agreementValue);
}
 

import org.bouncycastle.crypto.agreement.ECDHBasicAgreement; //导入方法依赖的package包/类
public static void main( String[] args ) throws InvalidKeySpecException, InvalidKeyException, IOException {
    ECPublicKey clientKey = (ECPublicKey) ECDH_KEY_FACTORY.generatePublic( new X509EncodedKeySpec( Base64.getDecoder().decode( "MHYwEAYHKoZIzj0CAQYFK4EEACIDYgAEDEKneqEvcqUqqFMM1HM1A4zWjJC+I8Y+aKzG5dl+6wNOHHQ4NmG2PEXRJYhujyodFH+wO0dEr4GM1WoaWog8xsYQ6mQJAC0eVpBM96spUB1eMN56+BwlJ4H3Qx4TAvAs" ) ) );
    ECPrivateKey privateKey = (ECPrivateKey) ECDH_KEY_FACTORY.generatePrivate( new PKCS8EncodedKeySpec( Base64.getDecoder().decode( "MB8CAQAwEAYHKoZIzj0CAQYFK4EEACIECDAGAgEBBAEB" ) ) );

    ECDHBasicAgreement agreement = new ECDHBasicAgreement();
    agreement.init( PrivateKeyFactory.createKey( privateKey.getEncoded() ) );
    byte[] secret = agreement.calculateAgreement( PublicKeyFactory.createKey( clientKey.getEncoded() ) ).toByteArray();

    System.out.println( Util.toHexString( secret ) );
    System.out.println( Util.toHexString( Base64.getDecoder().decode( "DEKneqEvcqUqqFMM1HM1A4zWjJC+I8Y+aKzG5dl+6wNOHHQ4NmG2PEXRJYhujyod" ) ) );
}
 

import org.bouncycastle.crypto.agreement.ECDHBasicAgreement; //导入方法依赖的package包/类
public static AesKey sessionKey(
        final CipherParameters receiverKey,
        final CipherParameters senderKey,
        final CipherParameters privateKey,
        final ECPublicKeyParameters publicKey
) {
    final ECDHBasicAgreement senderAgreement = new ECDHBasicAgreement();
    senderAgreement.init(privateKey);
    final EcdhSharedSecret sharedSecret = new EcdhSharedSecret(
        ((ECPublicKeyParameters)receiverKey).getQ(),
        ((ECPublicKeyParameters)senderKey).getQ(),
        senderAgreement.calculateAgreement(publicKey));
    final DigestSha384 hash = DigestSha384.digest(sharedSecret);
    return new AesKey(Arrays.copyOf(hash.getBytes(), AesKey.AES_KEY_BYTES));
}