最让人费解的就是这行代码了

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#1 Created at ... [Delete] [Delete and Lock User]

SecretKey key2 = new SecretKeySpec(bkey, "HmacMD5");

指定算法有什么用呢？

我用空串一样可以得到key！

#2 Created at ... [Delete] [Delete and Lock User]

不是用来解密的么？我没跟着敲了。。。。你输入空串也可以解密么？

#3 Created at ... [Delete] [Delete and Lock User]

验证个过了，不指定编码方式，保留 "" 一样可以正常加密

#4 Created at ... [Delete] [Delete and Lock User]

有种东西叫做源码，不明白的时候，可以点进去瞄一眼。