aesCbc.decrypt not suport emoji

[easychen]

I found aes-js's aesCbc.decrypt can't decrypt string with emoji , such as 🍩 🙃 .

details :

first , I use php encrypt a string ，and then decrypt it

$key = "b0baee9d279d34fa";
$iv = "e11170b8cbd2d741" ;

$out = openssl_encrypt( "emoji 🙃 " , 'AES-128-CBC' ,  $key , 0 , $iv  );
echo $out ."\r\n";
echo openssl_decrypt( $out , 'AES-128-CBC' ,  $key , 0 , $iv  );

output:

CUTfIyfmlek9G9lfYwAe8g==
emoji 🙃 

It works fine which means the encrypted stirng is right.

then , when I decrypt it with aes-js , 🙃 destoried .

const key = aesjs.utils.utf8.toBytes( "b0baee9d279d34fa" );
const iv = aesjs.utils.utf8.toBytes( "e11170b8cbd2d741");

var buf = Buffer.from( "CUTfIyfmlek9G9lfYwAe8g==" , 'base64');
var aesCbc = new aesjs.ModeOfOperation.cbc(key, iv);

let decryptedBytes = aesCbc.decrypt(buf);                
let decryptedText = aesjs.utils.utf8.fromBytes(decryptedBytes);
console.log( decryptedText );

output:

emoji ߙ㠅����

[hdwang123]

I also have the same problem whith decript the emoji string. how can I fix it.

[easychen]

I also have the same problem whith decript the emoji string. how can I fix it.

use base64 to wrap it for now…

[hdwang123]

I had solve the problem. relace the method 【convertUtf8】 in the index.js

  /**

• utf8 byte to unicode string

• @param utf8Bytes

• @returns {string}
  */
  function utf8ByteToUnicodeStr(utf8Bytes){
  var unicodeStr ="";
  for (var pos = 0; pos < utf8Bytes.length;){
  var flag= utf8Bytes[pos];
  var unicode = 0 ;
  if ((flag >>>7) === 0 ) {
  unicodeStr+= String.fromCharCode(utf8Bytes[pos]);
  pos += 1;

   } else if ((flag &0xFC) === 0xFC ){
       unicode = (utf8Bytes[pos] & 0x3) << 30;
       unicode |= (utf8Bytes[pos+1] & 0x3F) << 24;
       unicode |= (utf8Bytes[pos+2] & 0x3F) << 18;
       unicode |= (utf8Bytes[pos+3] & 0x3F) << 12;
       unicode |= (utf8Bytes[pos+4] & 0x3F) << 6;
       unicode |= (utf8Bytes[pos+5] & 0x3F);
       unicodeStr+= String.fromCodePoint(unicode) ;
       pos += 6;
  
   }else if ((flag &0xF8) === 0xF8 ){
       unicode = (utf8Bytes[pos] & 0x7) << 24;
       unicode |= (utf8Bytes[pos+1] & 0x3F) << 18;
       unicode |= (utf8Bytes[pos+2] & 0x3F) << 12;
       unicode |= (utf8Bytes[pos+3] & 0x3F) << 6;
       unicode |= (utf8Bytes[pos+4] & 0x3F);
       unicodeStr+= String.fromCodePoint(unicode) ;
       pos += 5;
  
   } else if ((flag &0xF0) === 0xF0 ){
       unicode = (utf8Bytes[pos] & 0xF) << 18;
       unicode |= (utf8Bytes[pos+1] & 0x3F) << 12;
       unicode |= (utf8Bytes[pos+2] & 0x3F) << 6;
       unicode |= (utf8Bytes[pos+3] & 0x3F);
       unicodeStr+= String.fromCodePoint(unicode) ;
       pos += 4;
  
   } else if ((flag &0xE0) === 0xE0 ){
       unicode = (utf8Bytes[pos] & 0x1F) << 12;;
       unicode |= (utf8Bytes[pos+1] & 0x3F) << 6;
       unicode |= (utf8Bytes[pos+2] & 0x3F);
       unicodeStr+= String.fromCharCode(unicode) ;
       pos += 3;
  
   } else if ((flag &0xC0) === 0xC0 ){ //110
       unicode = (utf8Bytes[pos] & 0x3F) << 6;
       unicode |= (utf8Bytes[pos+1] & 0x3F);
       unicodeStr+= String.fromCharCode(unicode) ;
       pos += 2;
  
   } else{
       unicodeStr+= String.fromCharCode(utf8Bytes[pos]);
       pos += 1;
   }
  

  }
  return unicodeStr;
  }

   return {
       toBytes: toBytes,
       fromBytes: utf8ByteToUnicodeStr,
   }
  

[Ruffio]

Should this fix be implemented?

[ricmoo]

I plan to remove the UTF-8 libraries entirely from aes-js in the next version as there are many, much more complete implementations, and it has been a source of confusion for many people using UTF-8 strings not realizing they are viable as a binary encoding.

For a more complete implementation, please see my ethers.js library:

• toUtf8Bytes
• toUtf8String

There are a lot of additional edge cases these libraries handle, which are essential for security focused applications. The UTF-8 coding by themselves is as large as the entire AES cipher. :)

[vadhack]

I also have the same problem whith decript the emoji string. how can I fix it.

use base64 to wrap it for now…

How can i do that? can you explain?

[vadhack]

i can't find any solution, the emojis destroy my json string

[jimmylee]

I used @hdwang123's solution above and it worked for me as a replacement for AES.utils.utf8.fromBytes

[SashaSirotkin]

You can also just use the built-in TextEncoder API.

new TextEncoder('utf-8').encode(text);
new TextDecoder('utf-8').decode(bytes);