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1import java.security.KeyStore;
2import java.io.*;
3import javax.crypto.*;
4import java.math.*;
5import java.security.*;
6import javax.xml.bind.DatatypeConverter;
7public class javaexample {
8  public static void main(String []args ) throws Exception {
9    String fileName = "CEP-DEV-santander.jceks";
10    char[] password = "S1santan".toCharArray();
11    String alias = "banxico";
12    KeyStore ks = KeyStore.getInstance("JCEKS");
13    try (FileInputStream fis = new FileInputStream(fileName)) {
14      //KeyStore ks = KeyStore.getInstance("JCEKS");
15      //FileInputStream fis = new FileInputStream(fileName);
16      ks.load(fis, password);
17      SecretKey secretKey = (SecretKey) ks.getKey(alias, password);
18      System.out.println(new BigInteger(1, secretKey.getEncoded()).toString(16));
19      //SecretKey secretKey =(SecretKey) ks.getKey(alias, password);
20      String stringKey;
21        try {
22          secretKey = KeyGenerator.getInstance("AES").generateKey();
23        }catch (NoSuchAlgorithmException e) {System.out.println(e);}
24        if (secretKey != null) {
25          //stringKey = Base64.encodeToString(secretKey.getEncoded(), Base64.DEFAULT);
26          System.out.println("Algoritmo de llave: "+secretKey.getAlgorithm());
27          System.out.println("Formato de la llave: "+secretKey.getFormat());
28          String encoded = DatatypeConverter.printBase64Binary(secretKey.getEncoded());
29          System.out.println("Llave encodeada en Base64: "+encoded);
30          System.out.println("Metodo getEncoded: "+secretKey.getEncoded());
31        }
32        // Base 64 decode En Java 8, primero construir el objetoByte deacuerdo al Base64 exportado en Java7
33        // byte[] keyBytes = Base64.decodeBase64(encodedKey.getBytes("UTF-8"));
34        // Crear un nuevo SecretKEy con el algoritmo y los Bytes construidos en Java8
35        //SecretKeySpec keySpec = new SecretKeySpec(keyBytes, "AES");
36    }catch (Exception e) {
37      System.out.println("Tuve broncas");
38      System.out.println(e);
39    }
40  }
41}