在Java中是否有任何方法可以生成一个字符串的MD5哈希?
当前回答
import java.security.MessageDigest
val digest = MessageDigest.getInstance("MD5")
//Quick MD5 of text
val text = "MD5 this text!"
val md5hash1 = digest.digest(text.getBytes).map("%02x".format(_)).mkString
//MD5 of text with updates
digest.update("MD5 ".getBytes())
digest.update("this ".getBytes())
digest.update("text!".getBytes())
val md5hash2 = digest.digest().map(0xFF & _).map("%02x".format(_)).mkString
//Output
println(md5hash1 + " should be the same as " + md5hash2)
其他回答
使用java.security.MessageDigest库的简单函数
public String stringMD5Hash(String text) throws NoSuchAlgorithmException {
MessageDigest messageDigest = MessageDigest.getInstance("MD5");
byte[] bytes = messageDigest.digest(text.getBytes());
StringJoiner stringJoiner = new StringJoiner("");
for (byte b : bytes) {
stringJoiner.add(Integer.toHexString((b & 0xFF) | 0x100).substring(1, 3));
}
return stringJoiner.toString();
}
对于文件使用这个函数
public static String FileMD5Hash(File file) throws NoSuchAlgorithmException, IOException {
MessageDigest messageDigest = MessageDigest.getInstance("MD5");
byte[] bytes = messageDigest.digest(getFileBytes(file));
StringJoiner stringJoiner = new StringJoiner("");
for (byte b : bytes) {
stringJoiner.add(Integer.toHexString((b & 0xFF) | 0x100).substring(1, 3));
}
return stringJoiner.toString();
}
public static byte[] getFileBytes(File file) throws IOException{
InputStream inputStream = new FileInputStream(file);
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
byte[] bytes = new byte[1024];
int bytesRead;
while ((bytesRead = inputStream.read(bytes)) != -1) {
byteArrayOutputStream.write(bytes, 0, bytesRead);
}
return byteArrayOutputStream.toByteArray();
}
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* MD5 encryption
*
* @author Hongten
*
*/
public class MD5 {
public static void main(String[] args) {
System.out.println(MD5.getMD5("123456"));
}
/**
* Use md5 encoded code value
*
* @param sInput
* clearly
* @ return md5 encrypted password
*/
public static String getMD5(String sInput) {
String algorithm = "";
if (sInput == null) {
return "null";
}
try {
algorithm = System.getProperty("MD5.algorithm", "MD5");
} catch (SecurityException se) {
}
MessageDigest md = null;
try {
md = MessageDigest.getInstance(algorithm);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
byte buffer[] = sInput.getBytes();
for (int count = 0; count < sInput.length(); count++) {
md.update(buffer, 0, count);
}
byte bDigest[] = md.digest();
BigInteger bi = new BigInteger(bDigest);
return (bi.toString(16));
}
}
Codingkit上有一篇关于这个的文章。查看:http://codingkit.com/a/JAVA/2013/1020/2216.html
我已经使用php,如下所示
<?php
$goodtext = "Not found";
// If there is no parameter, this code is all skipped
if ( isset($_GET['md5']) ) {
$time_pre = microtime(true);
$md5 = $_GET['md5'];
// This is our alphabet
$txt = "0123456789";
$show = 15;
// Outer loop go go through the alphabet for the
// first position in our "possible" pre-hash
// text
for($i=0; $i<strlen($txt); $i++ ) {
$ch1 = $txt[$i]; // The first of two characters
// Our inner loop Note the use of new variables
// $j and $ch2
for($j=0; $j<strlen($txt); $j++ ) {
$ch2 = $txt[$j]; // Our second character
for($k=0; $k<strlen($txt); $k++ ) {
$ch3 = $txt[$k];
for($l=0; $l<strlen($txt); $l++){
$ch4 = $txt[$l];
// Concatenate the two characters together to
// form the "possible" pre-hash text
$try = $ch1.$ch2.$ch3.$ch4;
// Run the hash and then check to see if we match
$check = hash('md5', $try);
if ( $check == $md5 ) {
$goodtext = $try;
break; // Exit the inner loop
}
// Debug output until $show hits 0
if ( $show > 0 ) {
print "$check $try\n";
$show = $show - 1;
}
if($goodtext == $try){
break;
}
}
if($goodtext == $try){
break;
}
}
if($goodtext == $try) {
break;
}
}
if($goodtext == $try){
break;
}
}
// Compute ellapsed time
$time_post = microtime(true);
print "Ellapsed time: ";
print $time_post-$time_pre;
print "\n";
}
?>
你可以参考这个资料来源
你需要java.security. messagdigest。
调用MessageDigest. getinstance ("MD5")来获取您可以使用的MessageDigest的MD5实例。
计算哈希的方法是:
以字节[]的形式提供整个输入,并使用md.digest(字节)在一次操作中计算哈希。 通过调用md.update(bytes)每次向MessageDigest提供一个字节[]块。当您完成添加输入字节时,计算与的散列 md.digest()。
md.digest()返回的字节[]是MD5散列。
我有一个类(哈希)在哈希格式转换纯文本:md5或sha1,类似于php函数(md5, sha1):
public class Hash {
/**
*
* @param txt, text in plain format
* @param hashType MD5 OR SHA1
* @return hash in hashType
*/
public static String getHash(String txt, String hashType) {
try {
java.security.MessageDigest md = java.security.MessageDigest.getInstance(hashType);
byte[] array = md.digest(txt.getBytes());
StringBuffer sb = new StringBuffer();
for (int i = 0; i < array.length; ++i) {
sb.append(Integer.toHexString((array[i] & 0xFF) | 0x100).substring(1,3));
}
return sb.toString();
} catch (java.security.NoSuchAlgorithmException e) {
//error action
}
return null;
}
public static String md5(String txt) {
return Hash.getHash(txt, "MD5");
}
public static String sha1(String txt) {
return Hash.getHash(txt, "SHA1");
}
}
使用JUnit和PHP进行测试
PHP脚本:
<?php
echo 'MD5 :' . md5('Hello World') . "\n";
echo 'SHA1:' . sha1('Hello World') . "\n";
输出PHP脚本:
MD5 :b10a8db164e0754105b7a99be72e3fe5
SHA1:0a4d55a8d778e5022fab701977c5d840bbc486d0
使用JUnit进行示例和测试:
public class HashTest {
@Test
public void test() {
String txt = "Hello World";
assertEquals("b10a8db164e0754105b7a99be72e3fe5", Hash.md5(txt));
assertEquals("0a4d55a8d778e5022fab701977c5d840bbc486d0", Hash.sha1(txt));
}
}
GitHub中的代码
https://github.com/fitorec/java-hashes
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