From 5d7b65670282a4fad015e37d567cfa171b162052 Mon Sep 17 00:00:00 2001
From: huliguo <2023611923@qq.com>
Date: 星期二, 20 五月 2025 12:25:19 +0800
Subject: [PATCH] 基础代码
---
pt-errand/src/main/java/com/ruoyi/errand/utils/WxPKCS7Encoder.java | 63 +++++++++++++++++++++++++++++++
1 files changed, 63 insertions(+), 0 deletions(-)
diff --git a/pt-errand/src/main/java/com/ruoyi/errand/utils/WxPKCS7Encoder.java b/pt-errand/src/main/java/com/ruoyi/errand/utils/WxPKCS7Encoder.java
new file mode 100644
index 0000000..14542b7
--- /dev/null
+++ b/pt-errand/src/main/java/com/ruoyi/errand/utils/WxPKCS7Encoder.java
@@ -0,0 +1,63 @@
+package com.ruoyi.errand.utils;
+
+import java.nio.charset.Charset;
+import java.util.Arrays;
+
+/**
+* 微信小程序加解密
+* @author pzb
+* @Date 2021/12/3 15:43
+*/
+public class WxPKCS7Encoder {
+ private static final Charset CHARSET = Charset.forName("utf-8");
+ private static final int BLOCK_SIZE = 32;
+
+ /**
+ * 获得对明文进行补位填充的字节.
+ *
+ * @param count
+ * 需要进行填充补位操作的明文字节个数
+ * @return 补齐用的字节数组
+ */
+ public static byte[] encode(int count) {
+ // 计算需要填充的位数
+ int amountToPad = BLOCK_SIZE - (count % BLOCK_SIZE);
+ if (amountToPad == 0) {
+ amountToPad = BLOCK_SIZE;
+ }
+ // 获得补位所用的字符
+ char padChr = chr(amountToPad);
+ String tmp = new String();
+ for (int index = 0; index < amountToPad; index++) {
+ tmp += padChr;
+ }
+ return tmp.getBytes(CHARSET);
+ }
+
+ /**
+ * 删除解密后明文的补位字符
+ *
+ * @param decrypted
+ * 解密后的明文
+ * @return 删除补位字符后的明文
+ */
+ public static byte[] decode(byte[] decrypted) {
+ int pad = decrypted[decrypted.length - 1];
+ if (pad < 1 || pad > 32) {
+ pad = 0;
+ }
+ return Arrays.copyOfRange(decrypted, 0, decrypted.length - pad);
+ }
+
+ /**
+ * 将数字转化成ASCII码对应的字符，用于对明文进行补码
+ *
+ * @param a
+ * 需要转化的数字
+ * @return 转化得到的字符
+ */
+ public static char chr(int a) {
+ byte target = (byte) (a & 0xFF);
+ return (char) target;
+ }
+}
--
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