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docs/src/v2/jt-808/guide/customization/msg-encryption.md
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| --- | ||
| icon: lock | ||
| --- | ||
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| # 消息加密(v2.1.4) | ||
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| ## 相关资料 | ||
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| - [#issues-82](https://github.com/hylexus/jt-framework/issues/82) | ||
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| ## 加密方式的判断 | ||
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| 收到消息，解析之后，消息体**可能**是密文。具体通过消息头中的消息体属性字段判断。 | ||
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| 消息体属性格式如下： | ||
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| - v2011/v2013 | ||
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| ``` | ||
| 消息体属性 word(16) | ||
| bit[0-10) 消息体长度 | ||
| bit[10-13) 数据加密方式 | ||
| 此三位都为 0,表示消息体不加密 | ||
| 第 10 位为 1,表示消息体经过 RSA 算法加密 | ||
| 其它保留 | ||
| bit[13] 分包 | ||
| 1: 消息体卫长消息,进行分包发送处理,具体分包信息由消息包封装项决定 | ||
| 0: 则消息头中无消息包封装项字段 | ||
| bit[14-15] 保留 | ||
| ``` | ||
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| - v2019 | ||
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| ``` | ||
| 消息体属性 word(16) | ||
| bit[0-10) 消息体长度 | ||
| bit[10-13) 数据加密方式 | ||
| 此三位都为 0,表示消息体不加密 | ||
| 第 10 位为 1,表示消息体经过 RSA 算法加密 | ||
| 其它保留 | ||
| bit[13] 分包 | ||
| 1: 消息体卫长消息,进行分包发送处理,具体分包信息由消息包封装项决定 | ||
| 0: 则消息头中无消息包封装项字段 | ||
| bit[14] 版本标识 | ||
| bit[15] 保留 | ||
| ``` | ||
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| 尽管消息体属性有所不同，但是其中的 `数据加密方式位` 都是相同的：消息体属性中的 `bit10`, `bit11` 和 `bit12` 三个位。 | ||
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| 这三个二进制位具体含义，应该和具体的硬件实现相关。 | ||
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| ## 加密/解密报文 | ||
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| 可以通过自定义 `Jt808MsgEncryptionHandler` 实现报文的加密/解密。也就是给 **spring** 容器中加入一个 `Jt808MsgEncryptionHandler` 实现类即可。 | ||
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| ```java | ||
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| @Component | ||
| public class Jt808MsgEncryptionHandlerDemo01 implements Jt808MsgEncryptionHandler { | ||
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| @Override | ||
| public ByteBuf decryptRequestBody(Jt808RequestHeader header, ByteBuf body) { | ||
| final int encryptionType = header.msgBodyProps().encryptionType(); | ||
| if (encryptionType == 0) { | ||
| return body; | ||
| } | ||
| // @see https://github.com/hylexus/jt-framework/issues/82 | ||
| // 消息属性中的 第10位，11位，12位 为 010 时，表示消息体经过SM4算法加密 | ||
| if (encryptionType == 0b010) { | ||
| try { | ||
| return JtCryptoUtil.SM4.ecbDecrypt(getSecretKey(), body); | ||
| } finally { | ||
| JtProtocolUtils.release(body); | ||
| } | ||
| } | ||
| throw new NotImplementedException("不支持的加密类型: 0b" + FormatUtils.toBinaryString(encryptionType, 3)); | ||
| } | ||
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| @Override | ||
| public ByteBuf encryptResponseBody(Jt808Response response, ByteBuf plaintextBody) { | ||
| // response.encryptionType(010); | ||
| final int encryptionType = response.encryptionType(); | ||
| if (encryptionType == 0) { | ||
| return plaintextBody; | ||
| } | ||
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| // @see https://github.com/hylexus/jt-framework/issues/82 | ||
| // 消息属性中的 第10位，11位，12位 为 010 时，表示消息体经过SM4算法加密 | ||
| if (encryptionType == 0b010) { | ||
| try { | ||
| return JtCryptoUtil.SM4.ecbEncrypt(getSecretKey(), plaintextBody); | ||
| } finally { | ||
| JtProtocolUtils.release(plaintextBody); | ||
| } | ||
| } | ||
| throw new NotImplementedException("不支持的加密类型: 0b" + FormatUtils.toBinaryString(encryptionType, 3)); | ||
| } | ||
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| private byte[] getSecretKey() { | ||
| // 从其他配置中获取密钥 | ||
| return HexStringUtils.hexString2Bytes("8e47374be6b8d114cb47be6a9a128a37"); | ||
| } | ||
| } | ||
| ``` |
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