iAPZyf7j

1import java.nio.charset.StandardCharsets;
2import java.security.InvalidKeyException;
3import java.security.MessageDigest;
4import java.security.NoSuchAlgorithmException;
5import java.security.NoSuchAlgorithmException;
6import java.util.Base64;
7
8import javax.crypto.Mac;
9import javax.crypto.spec.SecretKeySpec;
10
11class Main {
12  public static void main(String[] args) throws NoSuchAlgorithmException, InvalidKeyException {
13    String secret = "..."; // Your API Secret
14    String method = "GET";
15    String body = "";
16    String date = "2019-01-09T11:24:40+00:00"; // timestamp
17    String path = "/api/rates/BTCEUR";
18    String contentType = "application/json";
19
20    String bodyMD5 = body.isEmpty() ? "" : md5hex(body);
21
22    String stringToSign = String.join("\n", method, bodyMD5, contentType, date, path);
23
24    String signature = hmac(stringToSign, secret);
25
26    System.out.println(signature);
27  }
28
29  private static String md5hex(String str) throws NoSuchAlgorithmException {
30    MessageDigest md5 = MessageDigest.getInstance("MD5");
31    byte[] bytes = md5.digest(str.getBytes(StandardCharsets.UTF_8));
32
33    return hex(bytes);
34  }
35
36  private static String hmac(String str, String secret) throws InvalidKeyException, NoSuchAlgorithmException {
37    SecretKeySpec secretKey = new SecretKeySpec(secret.getBytes(StandardCharsets.UTF_8), "HmacSHA1");
38
39    Mac mac = Mac.getInstance("HmacSHA1");
40    mac.init(secretKey);
41    byte[] result = mac.doFinal(str.getBytes(StandardCharsets.UTF_8));
42
43    String base64 = Base64.getEncoder().encodeToString(result);
44
45    return base64;
46  }
47
48  private static String hex(byte[] bytes) {
49    StringBuilder sb = new StringBuilder();
50
51    for (byte b : bytes) {
52      sb.append(String.format("%02x", b));
53    }
54
55    return sb.toString();
56  }
57}