Unable to get access token in Java

vaishakh

Hi,
In Java, we are trying to get the access token, but getting an error: {"status": "error", "message": "Invalid checksum", "error_type": "TokenException"}

Below is the code snippet we are using:

public void getAccessToken(String requestToken,String apiKey, String secretKey) {
        PostMethod postMethod = null;
        try {
            postMethod = new PostMethod("https://api.kite.trade/session/token");
        postMethod.addParameter("api_key", apiKey);
        postMethod.addParameter("request_token", requestToken);
        postMethod.addParameter("checksum", getSHA256Hash(apiKey+requestToken+secretKey));
            HttpClient client = new HttpClient();
            int httpStatusCode = client.executeMethod(postMethod);
            System.out.println("HTTPStatusCode [" + httpStatusCode + "] [" + postMethod.getResponseBodyAsString() + "]");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (postMethod != null) {
                postMethod.releaseConnection();
            }
        }
    }

private String getSHA256Hash(String data) {
        String result = null;
        try {
            MessageDigest digest = MessageDigest.getInstance("SHA-256");
            byte[] hash = digest.digest(data.getBytes(StandardCharsets.UTF_8));
//            return String.valueOf(hash);
            return DatatypeConverter.printHexBinary(hash); // make it printable
        }catch(Exception ex) {
            ex.printStackTrace();
        }
        return result;
    }

Validated the checksum value on http://www.xorbin.com/tools/sha256-hash-calculator and it's matching with the checksum value generated by getSHA256Hash() method. Please can you help us to resolve this issue?

Regards,
Vaishakh

vaishakh

It's working once the checksum is converted to lower case.