通用API接口签名算法（参考淘宝）

java接口签名算法

java接口签名算法

import javax.crypto.Mac;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.io.IOException;
import java.security.GeneralSecurityException;
import java.security.MessageDigest;
import java.util.Arrays;
import java.util.Map;

public class SignUtil {


    public static final String SIGN_METHOD_MD5 = "md5";
    public static final String SIGN_METHOD_HMAC = "hmac";
    private static final String CHARSET_UTF8 = "utf-8";


    /**
     * 对TOP请求进行签名。
     */
    public static String signTopRequest(Map<String, String> params, String secret, String signMethod) throws IOException {
        // 第一步：检查参数是否已经排序
        String[] keys = params.keySet().toArray(new String[0]);
        Arrays.sort(keys);

        // 第二步：把所有参数名和参数值串在一起
        StringBuilder query = new StringBuilder();
        if (SIGN_METHOD_MD5.equals(signMethod)) {
            query.append(secret);
        }
        for (String key : keys) {
            String value = params.get(key);
            if (isNotEmpty(key) && isNotEmpty(value)) {
                query.append(key).append(value);
            }
        }

        // 第三步：使用MD5/HMAC加密
        byte[] bytes;
        if (SIGN_METHOD_HMAC.equals(signMethod)) {
            bytes = encryptHMAC(query.toString(), secret);
        } else {
            query.append(secret);
            bytes = encryptMD5(query.toString());
        }

        // 第四步：把二进制转化为大写的十六进制
        return byte2hex(bytes);
    }

    /**
     * 对字节流进行HMAC_MD5摘要。
     */
    private static byte[] encryptHMAC(String data, String secret) throws IOException {
        byte[] bytes = null;
        try {
            SecretKey secretKey = new SecretKeySpec(secret.getBytes(CHARSET_UTF8), "HmacMD5");
            Mac mac = Mac.getInstance(secretKey.getAlgorithm());
            mac.init(secretKey);
            bytes = mac.doFinal(data.getBytes(CHARSET_UTF8));
        } catch (GeneralSecurityException gse) {
            throw new IOException(gse.toString());
        }
        return bytes;
    }

    /**
     * 对字符串采用UTF-8编码后，用MD5进行摘要。
     */
    private static byte[] encryptMD5(String data) throws IOException {
        return encryptMD5(data.getBytes(CHARSET_UTF8));
    }

    /**
     * 对字节流进行MD5摘要。
     */
    private static byte[] encryptMD5(byte[] data) throws IOException {
        byte[] bytes = null;
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            bytes = md.digest(data);
        } catch (GeneralSecurityException gse) {
            throw new IOException(gse.toString());
        }
        return bytes;
    }

    /**
     * 把字节流转换为十六进制表示方式。
     */
    private static String byte2hex(byte[] bytes) {
        StringBuilder sign = new StringBuilder();
        for (int i = 0; i < bytes.length; i++) {
            String hex = Integer.toHexString(bytes[i] & 0xFF);
            if (hex.length() == 1) {
                sign.append("0");
            }
            sign.append(hex.toUpperCase());
        }
        return sign.toString();
    }

    private static boolean isNotEmpty(String value) {
        int strLen;
        if (value == null || (strLen = value.length()) == 0) {
            return false;
        }
        for (int i = 0; i < strLen; i++) {
            if ((Character.isWhitespace(value.charAt(i)) == false)) {
                return true;
            }
        }
        return false;
    }
    public static void main(String[] args) throws Exception {
		Map<String, String> params = new HashMap<String, String>();
		// 公共参数
		params.put("method", "taobao.item.seller.get");
		params.put("app_key", appKey);
		params.put("session", sessionKey);
		DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		params.put("timestamp", df.format(new Date()));
		params.put("format", "json");
		params.put("v", "2.0");
		params.put("sign_method", "hmac");
		// 业务参数
		params.put("fields", "num_iid,title,nick,price,num");
		params.put("num_iid", "123456789");
		// 签名参数
		params.put("sign", signTopRequest(params, appSecret, SIGN_METHOD_HMAC));
	}
}

JavaScript接口签名算法

内容转自 ：https://blog.kfzsy.com/api-sign.html