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A Java SDK for communicating with the 6Estates Intelligent Document Processing(IDP) Platform

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package com.sixestates.utils;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.nio.charset.StandardCharsets;
import java.security.InvalidKeyException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * @author kechen, 19/08/24.
 */
public class EncryptUtil {
    public static String buildSHA256Str(String str)
            throws NoSuchAlgorithmException, UnsupportedEncodingException {
        MessageDigest messageDigest = MessageDigest.getInstance("SHA-256");
        byte[] hash = messageDigest.digest(str.getBytes("UTF-8"));
        return bytesToHex(hash);
    }

    public static String computeHmacSha256(String key, byte[] message)
            throws NoSuchAlgorithmException, InvalidKeyException {
        Mac hasher = Mac.getInstance("HmacSHA256");
        hasher.init(new SecretKeySpec(key.getBytes(StandardCharsets.UTF_8), "HmacSHA256"));
        byte[] hash = hasher.doFinal(message);
        return bytesToHex(hash);

    }

    private static String bytesToHex(byte[] bytes) {
        StringBuilder result = new StringBuilder();
        for (byte aByte : bytes) {
            result.append(String.format("%02x", aByte));
        }
        return result.toString();
    }
}