CryptoUtil.java

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 */
package week04;

/**
 *
 * @author levan
 */
    public class CryptoUtil {
  
    public static String toHexString (byte[] bytes) {
    StringBuilder hexString = new StringBuilder();
    for (byte b :bytes) {
    String hex = Integer.toHexString(0xFF & b);
         if (hex.length() == 1) {
             hexString.append('0');
         }
        hexString.append (hex);
    }
        return hexString.toString();
    }

    public static final void byte2hex(byte b, StringBuffer buf) {
    char[] hexChars = {
    '0', '1', '2', '3',
    '4', '5', '6', '7',
    '8', '9', 'A', 'B',
    'C', 'D', 'E', 'F'};
    int high = ((b & 0xf0) >> 4);
    int low = (b & 0x0f);
    buf.append (hexChars [high]);
    buf.append (hexChars [low]);
}
    }