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CryptoJS AES Example
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset='utf-8'> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.2/components/core-min.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.2/components/sha256.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.2/components/enc-base64.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.2/rollups/aes.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.2/rollups/pbkdf2.js"></script> | |
| <script> | |
| // Code goes here | |
| var keySize = 256; | |
| var ivSize = 128; | |
| var iterations = 100; | |
| var message = "Hello World"; | |
| var password = "Secret Password"; | |
| function encrypt (msg, pass) { | |
| var salt = CryptoJS.lib.WordArray.random(128/8); | |
| var key = CryptoJS.PBKDF2(pass, salt, { | |
| keySize: keySize/32, | |
| iterations: iterations | |
| }); | |
| var iv = CryptoJS.lib.WordArray.random(ivSize/8); | |
| var encrypted = CryptoJS.AES.encrypt(msg, key, { | |
| iv: iv, | |
| padding: CryptoJS.pad.Pkcs7, | |
| mode: CryptoJS.mode.CBC, | |
| hasher: CryptoJS.algo.SHA256 | |
| }); | |
| // salt, iv will be hex 32 in length | |
| // append them to the ciphertext for use in decryption | |
| var transitmessage = salt.toString()+ iv.toString() + encrypted.toString(); | |
| return transitmessage; | |
| } | |
| function decrypt (transitmessage, pass) { | |
| var salt = CryptoJS.enc.Hex.parse(transitmessage.substr(0, 32)); | |
| var iv = CryptoJS.enc.Hex.parse(transitmessage.substr(32, 32)) | |
| var encrypted = transitmessage.substring(64); | |
| var key = CryptoJS.PBKDF2(pass, salt, { | |
| keySize: keySize/32, | |
| iterations: iterations | |
| }); | |
| var decrypted = CryptoJS.AES.decrypt(encrypted, key, { | |
| iv: iv, | |
| padding: CryptoJS.pad.Pkcs7, | |
| mode: CryptoJS.mode.CBC, | |
| hasher: CryptoJS.algo.SHA256 | |
| }) | |
| return decrypted; | |
| } | |
| var encrypted = encrypt(message, password); | |
| var decrypted = decrypt(encrypted, password); | |
| console.log("Encrypted: "+ encrypted) | |
| console.log("Decrypted: "+ decrypted.toString(CryptoJS.enc.Utf8)) | |
| </script> | |
| </head> | |
| <body> | |
| </body> | |
| </html> |
Way shorter version:
<!DOCTYPE html> <html> <head> <meta charset='utf-8'> <script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.2/rollups/aes.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.2/rollups/pbkdf2.js"></script> <script> </script> var encrypted=CryptoJS.AES.encrypt("Hello Encrypted World!", "my secret key").toString() var decrypted=CryptoJS.AES.decrypt(encrypted, "my secret key").toString(CryptoJS.enc.Utf8) console.log("Encrypted: "+ encrypted) console.log("Decrypted: "+ decrypted) </head> <body> </body> </html>Thank you. This one helped me a lot :)
I guessed that, that's why I posted it. I like "linear" things like that too.
There is a mistake in the code!
The hasher is part of the key derivation function not part of the encrypted function
var key = CryptoJS.PBKDF2(pass, salt, {
keySize: keySize/32,
iterations: iterations,
hasher: CryptoJS.algo.SHA256
});
var iv = CryptoJS.lib.WordArray.random(ivSize/8);
var encrypted = CryptoJS.AES.encrypt(msg, key, {
iv: iv,
padding: CryptoJS.pad.Pkcs7,
mode: CryptoJS.mode.CBC
});
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Thank you. This one helped me a lot :)