java crypto

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import java.security.Security;

public static void main(String[] args) throws Exception {
    Security.addProvider(new BouncyCastleProvider());
    KeyGenerator kg = KeyGenerator.getInstance("aes", BouncyCastleProvider.PROVIDER_NAME);
    kg.init(256);
    SecretKey secretKey=kg.generateKey();
    System.out.println(secretKey.getFormat());
    Cipher c = Cipher.getInstance("AES/CBC/PKCS5Padding", "BC");
    c.init(Cipher.ENCRYPT_MODE, secretKey);
    byte[]  t1 = c.update("ok2dfasjfhasjkdfhkawlehfkawefawef".getBytes());
    byte[] t2 = c.doFinal("ok".getBytes());
    System.out.println(Base64.toBase64String(t1));
}

public static int hashCode(byte[] value) {
    int h = 0;
    for (byte v : value) {
        h = 31 * h + (v & 0xff);
    }
    return h;
}

AlgorithmParameters.getInstance(algorithm); "EC"

ecAlgParams.init(initSpec);　　//new ECGenParameterSpec(curveName);

ECParameterSpec ecSpec = ecAlgParams.getParameterSpec(ECParameterSpec.class);

ASN1EncodableVector v = new ASN1EncodableVector();

v.add(new ASN1Integer(checkValue(n, x)));

return new DERSequence(v).getEncoded(ASN1Encoding.DER);