package cn.com.test;
 /* incoming parameter: an array of bytes
  * Outgoing parameter: MD5 result character set of the byte array
 */
public class MD5 {

	public static String getMD5 (byte[] source){
		String s = null;
 		// used to convert bytes to hexadecimal representation of characters
		char hexDigits[] = {'0' ,'1', '2', '3', '4' ,'5' ,'6', '7','8','9','a','b','c','d','e','f'};
		
		try {
			java.security.MessageDigest md = java.security.MessageDigest.getInstance("MD5");
			md.update(source);
 			The result of the //MD5 calculation is a 128-bit long integer, which in bytes is 16 bytes
			byte tmp[] = md.digest();
 			// Each byte is represented in hexadecimal using two characters, so 32 characters are needed to represent it in hexadecimal
			char str[] = new char[16*2];
 			// indicates the position of the corresponding character in the conversion result
			int k = 0;
			for (int i= 0;i< 16;i++){
 				// Convert each byte of the MD5 to hexadecimal characters, starting with the first byte
 				//fetch the i-th byte
				byte byte0 = tmp[i];
				// Take the high of the byte4 Bitwise digital conversion，>>>  is a logical right shift， Shift the sign bits together to the right
				str[k++] = hexDigits[byte0 >>> 4 & 0xf];
 				//de-byte the lower 4 bits of the digital conversion
				str[k++] = hexDigits[byte0 & 0xf];				
			}
			s = new String(str);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return s;
	}
	public static void main(String[] args) {
		byte byarr[] = {'1','2','3','!','@','#'};
		System.out.println(MD5.getMD5(byarr));
	}
}

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