Sha1 hashes based on a given String : SHA « Security « Android

1. Android
2. Security
3. SHA

Sha1 hashes based on a given String

 
//package gr.aueb.cs.mscis.chordroid.util;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * This class produces Sha1 hashes based on a given String
 * @author lupin
 *
 */
class Sha1 {

  public static String getHash(String str) {
    MessageDigest digest = null;
    byte[] input = null;

    try {
      digest = MessageDigest.getInstance("SHA-1");
      digest.reset();
      input = digest.digest(str.getBytes("UTF-8"));

    } catch (NoSuchAlgorithmException e1) {
      e1.printStackTrace();
    } catch (UnsupportedEncodingException e) {
      e.printStackTrace();
    }
    return convertToHex(input);
  }
  
  public static String getHash(byte[] data) {
    MessageDigest digest = null;
    byte[] input = null;

    try {
      digest = MessageDigest.getInstance("SHA-1");
      digest.reset();
      input = digest.digest(data);

    } catch (NoSuchAlgorithmException e1) {
      e1.printStackTrace();
    }
    return convertToHex(input);
  }
  
    private static 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();
    } 


}

   
  

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