Implementation of java encryption MD5 and an example of password Verification Code

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MD5 algorithm has the following characteristics:

Compressibility: Any length of data, the calculated MD5 value length is fixed.

Easy to calculate: MD5 values are easy to calculate from raw data.

Anti-modification: Any change to the original data, even if only 1 byte is modified, the MD5 value obtained is very different.

Strong anti-collision: Given the original data and its MD5 value, it is very difficult to find a data with the same MD5 value (i.e. fake data).

MD5 allows large volumes of information to be "compressed" into a secure format (i.e., a string of bytes of arbitrary length is converted into a string of hexadecimal digits of a certain length) before being signed with a private key by digital signature software. In addition to MD5, some of the more famous ones are sha-1, RIPEMD and Haval.

package test; import java.io.UnsupportedEncodingException;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;import org.junit.Test;public class Teste { @Test public void testMd5() { System.out.println (encrypt("1234567")); } @Test public void testlogin() { String password = encrypt ("123456adfaf"); if (encrypt("123456adfaf").equals (password)) { System.out.println("Password correct"); } else { System.out.println("Password incorrect"); } } private String encrypt (String password) { String passwordMd5 = null; try { MessageDigest md5 = MessageDigest.getInstance("MD5"); byte[] bytes = md5.digest(password.getBytes("utf-8")); passwordMd5 = toHex(bytes); } catch (NoSuchAlgorithmException| UnsupportedEncodingException e) { e.printStackTrace(); } return passwordMd5; } private static String toHex (byte[] bytes) { final char[] HEX_DIGITS = "0123456789ABCDEF".toCharArray(); StringBuilder ret = new StringBuilder (bytes.length * 2); for (int i=0; i> 4) & 0x0f]); ret.append(HEX_DIGITS[bytes[i] & 0x0f]); } return ret.toString(); }}

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