75 lines
1.4 KiB
Java
Executable File
75 lines
1.4 KiB
Java
Executable File
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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public class HexUtil
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{
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/**
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* Print out a byte array in hexadecimal
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*
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* @param bytes array
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*/
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public static void printHex(byte[] bytes)
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{
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for (byte b : bytes) System.out.print(byteToHexString(b));
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}
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/**
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* convert a byte to a hex string
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*
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* @param data array
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* @return String representation in hex
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*/
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public static String byteToHexString(byte data)
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{
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StringBuffer buf = new StringBuffer();
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buf.append(toHexChar((data >>> 4) & 0x0F));
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buf.append(toHexChar(data & 0x0F));
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return buf.toString();
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}
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/**
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* convert a integer into a hexadecimal character
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*
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* @param i integer
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* @return hex char
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*/
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public static char toHexChar(int i)
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{
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if ((0 <= i) && (i <= 9))
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{
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return (char) ('0'+i);
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} else
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{
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return (char) ('a'+(i-10));
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}
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}
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/**
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* Generate the md5 digest of the byte array data in hexadecimal
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*
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* @param data array
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* @return byte array of the md5 digest in hex
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*/
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public static byte[] generateMD5(byte[] data)
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{
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try
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{
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byte[] md5 = MessageDigest.getInstance("MD5").digest(data);
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String m = "";
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for (int i = 0; i < md5.length; i++)
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{
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m = m+byteToHexString(md5[i]).toUpperCase();
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}
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return m.getBytes();
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} catch (NoSuchAlgorithmException e)
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{
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// TODO Auto-generated catch block
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e.printStackTrace();
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return null;
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}
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}
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}
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