HmacSHA256加密算法

HmacSHA256是一种基于SHA-256哈希函数的消息认证码（MAC）算法。它结合了哈希函数和密钥，用于验证数据的完整性和真实性。“Hmac"代表"Hash-based Message Authentication Code”，即基于哈希的消息认证码。

private static final String ALGORITHM = "HmacSHA256";

    public static boolean valid(String message, String secret, String signature) {
        return signature != null && signature.equals(sign(message, secret));
    }

    public static String sign(String message, String secret) {
        try {
            Mac hmac = Mac.getInstance(ALGORITHM);
            SecretKeySpec secret_key = new SecretKeySpec(secret.getBytes(StandardCharsets.UTF_8), ALGORITHM);
            hmac.init(secret_key);
            byte[] bytes = hmac.doFinal(message.getBytes());
            return byteArrayToHexString(bytes);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return null;
    }

    private static String byteArrayToHexString(byte[] bytes) {
        return Base64.getEncoder().encodeToString(bytes);
    }
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22

测试代码

public static void main(String[] args) {
        String secret = "secret";
        String msg = "test123";
        String sign = sign(msg, secret);
        boolean flag = valid(msg, secret, sign);
        System.out.println(flag);
    }
1
2
3
4
5
6
7