| | |
| | | /**
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| | | * 对公众平台发送给公众账号的消息加解密示例代码.
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| | | * |
| | | * @copyright Copyright (c) 1998-2014 Tencent Inc.
|
| | | */
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| | |
|
| | | // ------------------------------------------------------------------------
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| | |
|
| | | package com.qq.weixin.mp.aes;
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| | |
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| | | import java.nio.charset.Charset;
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| | | import java.util.Arrays;
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| | |
|
| | | /**
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| | | * 提供基于PKCS7算法的加解密接口.
|
| | | */
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| | | class PKCS7Encoder {
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| | | static Charset CHARSET = Charset.forName("utf-8");
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| | | static int BLOCK_SIZE = 32;
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| | |
|
| | | /**
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| | | * 获得对明文进行补位填充的字节.
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| | | * |
| | | * @param count 需要进行填充补位操作的明文字节个数
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| | | * @return 补齐用的字节数组
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| | | */
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| | | static byte[] encode(int count) {
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| | | // 计算需要填充的位数
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| | | int amountToPad = BLOCK_SIZE - (count % BLOCK_SIZE);
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| | | if (amountToPad == 0) {
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| | | amountToPad = BLOCK_SIZE;
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| | | }
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| | | // 获得补位所用的字符
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| | | char padChr = chr(amountToPad);
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| | | String tmp = new String();
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| | | for (int index = 0; index < amountToPad; index++) {
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| | | tmp += padChr;
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| | | }
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| | | return tmp.getBytes(CHARSET);
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| | | }
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| | |
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| | | /**
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| | | * 删除解密后明文的补位字符
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| | | * |
| | | * @param decrypted 解密后的明文
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| | | * @return 删除补位字符后的明文
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| | | */
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| | | static byte[] decode(byte[] decrypted) {
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| | | int pad = (int) decrypted[decrypted.length - 1];
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| | | if (pad < 1 || pad > 32) {
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| | | pad = 0;
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| | | }
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| | | return Arrays.copyOfRange(decrypted, 0, decrypted.length - pad);
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| | | }
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| | |
|
| | | /**
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| | | * 将数字转化成ASCII码对应的字符,用于对明文进行补码
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| | | * |
| | | * @param a 需要转化的数字
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| | | * @return 转化得到的字符
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| | | */
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| | | static char chr(int a) {
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| | | byte target = (byte) (a & 0xFF);
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| | | return (char) target;
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| | | }
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| | |
|
| | | }
|
| | | /** |
| | | * 对公众平台发送给公众账号的消息加解密示例代码. |
| | | * |
| | | * @copyright Copyright (c) 1998-2014 Tencent Inc. |
| | | */ |
| | | |
| | | // ------------------------------------------------------------------------ |
| | | |
| | | package com.qq.weixin.mp.aes; |
| | | |
| | | import java.nio.charset.Charset; |
| | | import java.util.Arrays; |
| | | |
| | | /** |
| | | * 提供基于PKCS7算法的加解密接口. |
| | | */ |
| | | class PKCS7Encoder { |
| | | static Charset CHARSET = Charset.forName("utf-8"); |
| | | static 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 |
| | | */ |
| | | 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 |
| | | */ |
| | | static byte[] decode(byte[] decrypted) { |
| | | int pad = (int) 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 |
| | | */ |
| | | static char chr(int a) { |
| | | byte target = (byte) (a & 0xFF); |
| | | return (char) target; |
| | | } |
| | | |
| | | } |