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java 加密算法 MD5 實現代碼

package com.yill;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

/**

* MD5 encrypt class, returns a MD5-encrypted hex string.

*

* @author yill

* @version 2008-2-26

* @since 1.0

*/

public class YillMD5

{

/**

* The hex digits.

*/

private static final String[] hexDigits =

{

"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c",

"d", "e", "f"

};

/**

* Transform the byte array to hex string.

*

* @param b

* @return

*/

public static String byteArrayToHexString(byte[] b)

{

StringBuffer resultSb = new StringBuffer();

for (int i = 0; i < b.length; i++)

{

resultSb.append(byteToHexString(b[i]));

}

return resultSb.toString();

}

/**

* Transform a byte to hex string.

*

* @param b

* @return

*/

private static String byteToHexString(byte b)

{

int n = b;

if (n < 0)

n = 256 + n;

// get the first four bit

int d1 = n / 16;

// get the second four bit

int d2 = n % 16;

return hexDigits[d1] + hexDigits[d2];

}

/**

* Get the MD5 encrypt hex string of the origin string. <br/>The origin

* string won't validate here, so who use the API should validate by

* himself.

*

* @param origin

* @return

* @throws NoSuchAlgorithmException

*/

public static String MD5Encode(String origin)

throws NoSuchAlgorithmException

{

MessageDigest md = MessageDigest.getInstance("MD5");

return byteArrayToHexString(md.digest(origin.getBytes()));

}

public static void main(String[] args)

{

try

{

System.out

.println("The MD5 encrypt code of http://www.aygfsteel.com/yill/ is: "

+ YillMD5

.MD5Encode("http://www.aygfsteel.com/yill/"));

}

catch (NoSuchAlgorithmException e)

{

e.printStackTrace();

}

posted on 2008-03-18 23:42 yill 閱讀(448) 評論(0) 編輯收藏

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