How to understand PHP encryption function Javascript/Js decryption function

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"123456" in the following function code is an encrypted key, which you can change at will.

Php encryption, js decryption, seems to be meaningless, mainly key will be seen in js.

But it may be used in some places.

PHP encryption function

The copy code is as follows:

Js decryption function:

The copy code is as follows:

Function strencode (string) {

Key = calcMD5 ('123456')

String = Base64.decode (string)

Len = key.length

Code =''

For (I = 0; I < string.length; iTunes +) {

K = I% len

Code + = String.fromCharCode (string.charCodeAt (I) ^ key.charCodeAt (k))

}

Return Base64.decode (code)

}

Alert (strencode ('PGZ6Cz40Z1JCWCYNRVtSDwsvfVsIexpcEFN0DU0OSQkXQUIPCQxnV1NLDA9SSw8PF1JhWxAHZ18FAGIncUFiFS5yWxAuClxUf15fXA=='))

PHP encryption & JS decryption 2

The copy code is as follows: