CODEWITHSUNDEEP
android
droid
droid

Reputation: 414

converting a string to binary using UTF-8 encoding

I have to convert a string into binary using UTF-8, but i am unable to do that. I have tried 

String encodedName=URLEncoder.encode(name, "UTF-8");

but it doesn't gave me the binary format, it just returned me the same string with slight changes, please help.

EDIT:

what i have to do: I have a string suppose "HelloWorld" I have to convert it to binary using "UTF-8" and then use SHA1 hashing algorithm and from this i will get the hashkey and this is what i need "a hashkey".

I found this one for SHA1 hashing.

   public class AeSimpleSHA1 { 

    private  String convertToHex(byte[] data) { 
        StringBuffer buf = new StringBuffer();
        for (int i = 0; i < data.length; i++) { 
            int halfbyte = (data[i] >>> 4) & 0x0F;
            int two_halfs = 0;
            do { 
                if ((0 <= halfbyte) && (halfbyte <= 9)) 
                    buf.append((char) ('0' + halfbyte));
                else 
                    buf.append((char) ('a' + (halfbyte - 10)));
                halfbyte = data[i] & 0x0F;
            } while(two_halfs++ < 1);
        } 
        return buf.toString();
    } 

    public  String SHA1(String text) 
    throws NoSuchAlgorithmException, UnsupportedEncodingException  { 
    MessageDigest md;
    md = MessageDigest.getInstance("SHA-1");
    byte[] sha1hash = new byte[40];
    md.update(text.getBytes("iso-8859-1"), 0, text.length());
    sha1hash = md.digest();
    return convertToHex(sha1hash);

    } 

}

Upvotes: 2

Views: 11602

Answers (2)

Jon Skeet
Jon Skeet

Reputation: 1504092

It's not really clear what you mean, but you'd usually use:

byte[] data = name.getBytes("UTF-8");

I'm not sure why you've used URLEncoder in your attempt - or what your "desired result" is.

EDIT: Converting the binary data back to text so you can then call getBytes() on it in your SHA1 method makes no sense. Just change your hashing method do:

public String hashSha1(byte[] data) throws NoSuchAlgorithmException, 
    UnsupportedEncodingException { 
  MessageDigest md = MessageDigest.getInstance("SHA-1");
  md.update(data, 0, data.length);
  return convertToHex(md.digest());
}

Upvotes: 2

waqaslam
waqaslam

Reputation: 68187

why dont you simply use string's getBytes() method to convert into UTF-8 bytes array? see below:

String s = "this is my string";
byte[] bytes = s.getBytes();   // default:  UTF-8

the default encoding is UTF-8 in android, though you may further define your own encoding in the same method

Upvotes: 0

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