JS reverse | m3u8 data decryption of a spring and autumn network

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Preface

This is a group friendly demand , Back to m3u8 Data is encrypted , Based on the principle of mutual help , It's easy for him , Also write ( water ) An article .

The target site ：

Grab the bag

Old rules , First grab a bag and have a look .

You can see ,m3u8 In this bag data It's encrypted. , Next, let's do it .

Find the encrypted location

Response data like this is encrypted , You can search for .decrypt perhaps .decyrpt( This word is used to locate the location of encryption , This time is also relatively lucky , The search results are relatively few , It's easy to find the corresponding position .

This n.data.data It's the previous ciphertext .

Encryption logic analysis

Statement to restore data ：

r = xxtea.toString(xxtea.decrypt(n.data.data, xxtea.toBytes(i + sectionID)))

This i It's a bunch of hash value , Generated by the following code ：

e = new Rusha
t = sectionID + "icq"
i = e.digest(t).substr(0, 32)

hold Rusha Just button it out .

Then separate xxtea.decrypt and xxtea.toString Buckle it out , It's not hard , Deduct whatever you lack .

It is worth mentioning that , Need to use atob Method , It can be used Buffer.from replace ：

var atob = function(a){
    
    return Buffer.from(a, 'base64').toString('binary')
}

The operation effect is as follows ：

Finished writing , It seems a little short

Love & Peace, See you later .