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import java.io.UnsupportedEncodingException; |
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import java.security.MessageDigest; |
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import java.security.NoSuchAlgorithmException; |
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import java.util.Map; |
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import java.util.TreeMap; |
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/** |
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* @description: 生成签名 |
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* @author: dimengzhe |
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* @date: 2024/11/28 |
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**/ |
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public class SignatureUtil { |
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/** |
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* 生成请求签名 |
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* |
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* @param parameters 请求参数 |
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* @param appKey 应用的 AppKey |
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* @param secret 密钥 |
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* @return 签名 |
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*/ |
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public static String generateSignature(Map<String, String> parameters, String appKey, String secret) throws UnsupportedEncodingException, NoSuchAlgorithmException { |
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// 1. 使用 TreeMap 按照字典顺序对参数进行排序
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Map<String, String> sortedParams = new TreeMap<>(parameters); |
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sortedParams.put("_app", appKey); // 添加应用的 AppKey
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sortedParams.put("_t", String.valueOf(System.currentTimeMillis())); // 添加时间戳
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// 2. 拼接参数字符串
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String content = joinParameters(sortedParams); |
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// 3. 将密钥加在参数字符串的前后
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content = secret + content + secret; |
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// 4. 计算签名 (MD5)
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return md5(content); |
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} |
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/** |
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* 拼接参数字符串 |
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* |
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* @param parameters 排序后的参数 |
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* @return 拼接后的参数字符串 |
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*/ |
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private static String joinParameters(Map<String, String> parameters) throws UnsupportedEncodingException { |
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StringBuilder builder = new StringBuilder(); |
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for (Map.Entry<String, String> entry : parameters.entrySet()) { |
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if (builder.length() > 0) { |
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builder.append("&"); |
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} |
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builder.append(entry.getKey()).append("=").append(entry.getValue()); |
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} |
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return builder.toString(); |
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} |
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/** |
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* 计算 MD5 |
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* |
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* @param content 要计算 MD5 的字符串 |
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* @return MD5 值 |
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*/ |
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private static String md5(String content) throws NoSuchAlgorithmException { |
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MessageDigest md = MessageDigest.getInstance("MD5"); |
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byte[] bytes = md.digest(content.getBytes()); |
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StringBuilder sb = new StringBuilder(); |
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for (byte b : bytes) { |
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sb.append(String.format("%02x", b)); |
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} |
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return sb.toString(); |
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} |
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} |
@ -0,0 +1,28 @@ |
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import java.io.UnsupportedEncodingException; |
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import java.security.NoSuchAlgorithmException; |
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import java.util.Map; |
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/** |
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* @description: 验证签名方法 |
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* @author: dimengzhe |
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* @date: 2024/11/28 |
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**/ |
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public class SignatureValidator { |
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/** |
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* 验证签名是否正确 |
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* |
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* @param parameters 请求参数 |
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* @param appKey 应用的 AppKey |
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* @param secret 密钥 |
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* @param receivedSignature 请求中的签名 |
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* @return 是否验证通过 |
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*/ |
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public static boolean validateSignature(Map<String, String> parameters, String appKey, String secret, String receivedSignature) throws UnsupportedEncodingException, NoSuchAlgorithmException { |
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// 1. 重新生成签名
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String calculatedSignature = SignatureUtil.generateSignature(parameters, appKey, secret); |
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// 2. 比较计算出来的签名和请求中的签名
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return calculatedSignature.equals(receivedSignature); |
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} |
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} |
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