javascript - Crypto-js returns different values every time it's run when using AES -


i'm trying encrypt using crypto-js , using aes type of encryption.

the problem i'm having encrypted value different every time encrypt it.

with simple example, run same encryption 5 different times , 5 different results. wtf going on here?

task.js

var aes = require('crypto-js/aes'); var key = "abc123"; var secret = "encryptthisword";  console.log(aes.encrypt(secret, key).tostring()); console.log(aes.encrypt(secret, key).tostring()); console.log(aes.encrypt(secret, key).tostring()); console.log(aes.encrypt(secret, key).tostring()); console.log(aes.encrypt(secret, key).tostring());

enter image description here

check contents of aes.encrypt(secret, key) - object number of fields, iv , salt of particular interest (jsfiddle).

each time run aes.encrypt crypto-js chooses new iv , new salt (you can supply own values, way). random iv means output different same key, , random salt means actual encryption key different too, because derived the passphrase , salt.

you may (actually, should) ask why first ten base64 output characters same when both encryption key , iv different? because calling tostring() on ecnryption result converts "openssl-compatible string", base64("salted__" + salt + ciphertext), "salted__" constant prefix which, of course, leads same prefix in base64 output.


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