How to check if byte array is valid UTF-8 String

Question

I'm decoding messages with javax.crypto.Cipher and as an output I get byte[]. What is the fastest way to check if my key is correct and byte[] is valid string?

Getting a vaid UTF-8 string doesn't guarantee that the key is valid. What are you trying to achieve? — JB Nizet
– JB Nizet, Commented Oct 20, 2017 at 20:12

Max08 · Accepted Answer · 2017-10-20 20:08:40Z

8

Try This :-

public boolean checkUTF8(byte[] barr){

        CharsetDecoder decoder = Charset.forName("UTF-8").newDecoder();
        ByteBuffer buf = ByteBuffer.wrap(barr);

        try {
            decoder.decode(buf);

        }
        catch(CharacterCodingException e){
            return false;
        }

        return true;
    }

answered Oct 20, 2017 at 20:08

Max08

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