Java 与 PHP 的MD5加密为什么不一样？

php代码:

echo md5(chr(142));

java代码:

import java.math.BigInteger;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;public class utils {	public static void main(String[] args) {				char ss=(char)142;//这里换成56后md5后和php版的 md5后的结果一样		System.out.println(md5(ss+""));			}		public static String md5(String plainText) {		byte[] secretBytes = null;		try {			secretBytes = MessageDigest.getInstance("md5").digest(					plainText.getBytes());		} catch (NoSuchAlgorithmException e) {			throw new RuntimeException("没有md5这个算法！");		}		String md5code = new BigInteger(1, secretBytes).toString(16);		for (int i = 0; i < 32 - md5code.length(); i++) {			md5code = "0" + md5code;		}		return md5code;	}}

经过测试 获取142的char类型的md5后数值不一样,获取56 的char 后md5的值 一样，这是怎么回事，如何解决(都是utf-8编码)

回复讨论(解决方案)

plainText.getBytes( "GBK");

plainText.getBytes( "GBK");

这个方法不行，试过了

不知道为什么要
for (int i = 0; i < 32 - md5code.length(); i++) {
md5code = "0" + md5code;
}
而且终值还始终在变

  public static String getMd5(byte[] buffer) throws NoSuchAlgorithmException{    String s  = null;    char hexDigist[] = {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};    MessageDigest md = MessageDigest.getInstance("MD5");    md.update(buffer);    byte[] datas = md.digest(); //16个字节的长整数    char[] str = new char[2*16];    int k = 0;    for(int i=0;i<16;i++){      byte b   = datas[i];      str[k++] = hexDigist[b>>>4 & 0xf];//高4位      str[k++] = hexDigist[b & 0xf];//低4位    }    s = new String(str);    return s;  }

java中的MD5返回的是一个128位的长整形数,即16个字节,一个字节映射成2个字符,所以就是32个字符,md5 不可能不一样的都是遵循md5协议实现的,只是PHP在底层用C语言实现了
这里测试下:
java：

 public static void main(String[] args) {    try {      System.out.println(getMd5("123".getBytes()));    } catch (NoSuchAlgorithmException e) {      // TODO Auto-generated catch block      e.printStackTrace();    }  }

输出:
202cb962ac59075b964b07152d234b70
PHP代码:

echo md5("123");

输出:
202cb962ac59075b964b07152d234b70

  public static String getMd5(byte[] buffer) throws NoSuchAlgorithmException{    String s  = null;    char hexDigist[] = {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};    MessageDigest md = MessageDigest.getInstance("MD5");    md.update(buffer);    byte[] datas = md.digest(); //16个字节的长整数    char[] str = new char[2*16];    int k = 0;    for(int i=0;i<16;i++){      byte b   = datas[i];      str[k++] = hexDigist[b>>>4 & 0xf];//高4位      str[k++] = hexDigist[b & 0xf];//低4位    }    s = new String(str);    return s;  }

java中的MD5返回的是一个128位的长整形数,即16个字节,一个字节映射成2个字符,所以就是32个字符,md5 不可能不一样的都是遵循md5协议实现的,只是PHP在底层用C语言实现了
这里测试下:
java：

 public static void main(String[] args) {    try {      System.out.println(getMd5("123".getBytes()));    } catch (NoSuchAlgorithmException e) {      // TODO Auto-generated catch block      e.printStackTrace();    }  }

输出:
202cb962ac59075b964b07152d234b70
PHP代码:

echo md5("123");

输出:
202cb962ac59075b964b07152d234b70

还是不行，我把php和java代码全部贴出来吧,php结果是正确的，java代码如何改呢

<?php//php为正确的 结果：CA15B8C6D72A4442942045956DD371F8$password="123456";$pt='\x00\x00\x00\x00\x16\x9d\x56\x75';$vc='!PRY';$passwd = jspassword($password,$pt, $vc);echo "<br>结果：".$pt."<br>".$vc."<br>密码：".$passwd."<br><br>";function jspassword($p,$pt,$vc,$md5 = true){	echo $p.":".$pt.":".$vc;	if($md5)	{		$p = strtoupper(md5($p));	}	//echo "<br>".$p;exit;	$len = strlen($p);	$temp = null;	//echo "<br>md5Password:".$p."<br>";	for ($i=0; $i < $len ; $i = $i + 2)	{		//echo "<br>i:".$i;		$temp .= '\x'.substr($p, $i,2);	}	//echo "<br>".$temp."<br>";	//echo "<br><br><br>--->>>".md5(hex2asc($temp).hex2asc($pt));	//$str=hex2asc($temp).hex2asc($pt);	//echo "<br>内部:".$str."-->".md5(hex2asc($temp))."-->".md5(hex2asc($pt));	return strtoupper(md5(strtoupper(md5(hex2asc($temp).hex2asc($pt))).$vc));}/** * 十六进制转字符 *  * @access private * @param string $str * @return string */function hex2asc($str){	//echo "处理前：".$str."<br>";	//print_r( explode('\x', $str));	$str = join('', explode('\x', $str));	//echo "<br>处理后:".$str;	$len = strlen($str);	$data = null;	for ($i=0;$i<$len;$i+=2)	{		//echo "<br>::".substr($str,$i,2);		echo "<br>".hexdec(substr($str,$i,2)).":::".chr(hexdec(substr($str,$i,2)))."->".md5(chr(hexdec(substr($str,$i,2))));		$data.=chr(hexdec(substr($str,$i,2)));	}	echo "<br>".md5($data)."<br>";	return $data;}?>

import java.math.BigInteger;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;public class utils {	public static void main(String[] args) {				utils u=new utils();				String up=u.jspassword("123456", "\\x00\\x00\\x00\\x00\\x16\\x9d\\x56\\x75", "!PRY", true);		System.out.println("-----------------------------");		System.out.println(up);	}				public String jspassword(String password,String pt,String vc,boolean md5){				if(md5)		{			password = utils.md5(password).toUpperCase();		}		int len =password.length();		String temp="";				for (int i=0; i < len ; i = i + 2)		{									temp += "\\x"+password.substring(i, i+2);		}						return (utils.md5(utils.md5(utils.hex2asc(temp)+utils.hex2asc(pt)) .toUpperCase()+vc) ).toUpperCase();			}		public static String hex2asc(String str){		String [] s=str.trim().split("\\\\x");		//System.out.println(s.length);		StringBuffer sb=new StringBuffer();		for(String sItem:s){			//System.out.println(sItem);			sb.append(sItem);		}		int len = sb.toString().length();				//String data = null;		StringBuffer sb1=new StringBuffer();				for (int i=0;i<len;i+=2)		{			int x=Integer.parseInt(sb.toString().substring(i, i+2),16);			char ss=(char) x;						System.out.println(x+"::"+ss+"转换后->"+utils.md5(String.valueOf(ss)));						sb1.append(String.valueOf(ss));		}				return sb1.toString();	}		public static String md5(String plainText) {						byte[] secretBytes = null;		try {			secretBytes = MessageDigest.getInstance("md5").digest(					plainText.getBytes());		} catch (NoSuchAlgorithmException e) {			throw new RuntimeException("没有md5这个算法！");		}		String md5code = new BigInteger(1, secretBytes).toString(16);		for (int i = 0; i < 32 - md5code.length(); i++) {			md5code = "0" + md5code;		}		return md5code;	}			}

不知道为什么要
for (int i = 0; i < 32 - md5code.length(); i++) {
md5code = "0" + md5code;
}
而且终值还始终在变

  public static String getMd5(byte[] buffer) throws NoSuchAlgorithmException{    String s  = null;    char hexDigist[] = {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};    MessageDigest md = MessageDigest.getInstance("MD5");    md.update(buffer);    byte[] datas = md.digest(); //16个字节的长整数    char[] str = new char[2*16];    int k = 0;    for(int i=0;i<16;i++){      byte b   = datas[i];      str[k++] = hexDigist[b>>>4 & 0xf];//高4位      str[k++] = hexDigist[b & 0xf];//低4位    }    s = new String(str);    return s;  }

java中的MD5返回的是一个128位的长整形数,即16个字节,一个字节映射成2个字符,所以就是32个字符,md5 不可能不一样的都是遵循md5协议实现的,只是PHP在底层用C语言实现了
这里测试下:
java：

 public static void main(String[] args) {    try {      System.out.println(getMd5("123".getBytes()));    } catch (NoSuchAlgorithmException e) {      // TODO Auto-generated catch block      e.printStackTrace();    }  }

输出:
202cb962ac59075b964b07152d234b70
PHP代码:

echo md5("123");

输出:
202cb962ac59075b964b07152d234b70

我把php和java代码全部贴出来吧

<?php//php为正确的 结果：CA15B8C6D72A4442942045956DD371F8$password="123456";$pt='\x00\x00\x00\x00\x16\x9d\x56\x75';$vc='!PRY';$passwd = jspassword($password,$pt, $vc);echo "<br>结果：".$pt."<br>".$vc."<br>密码：".$passwd."<br><br>";function jspassword($p,$pt,$vc,$md5 = true){	echo $p.":".$pt.":".$vc;	if($md5)	{		$p = strtoupper(md5($p));	}	//echo "<br>".$p;exit;	$len = strlen($p);	$temp = null;	//echo "<br>md5Password:".$p."<br>";	for ($i=0; $i < $len ; $i = $i + 2)	{		//echo "<br>i:".$i;		$temp .= '\x'.substr($p, $i,2);	}	//echo "<br>".$temp."<br>";	//echo "<br><br><br>--->>>".md5(hex2asc($temp).hex2asc($pt));	//$str=hex2asc($temp).hex2asc($pt);	//echo "<br>内部:".$str."-->".md5(hex2asc($temp))."-->".md5(hex2asc($pt));	return strtoupper(md5(strtoupper(md5(hex2asc($temp).hex2asc($pt))).$vc));}/** * 十六进制转字符 *  * @access private * @param string $str * @return string */function hex2asc($str){	//echo "处理前：".$str."<br>";	//print_r( explode('\x', $str));	$str = join('', explode('\x', $str));	//echo "<br>处理后:".$str;	$len = strlen($str);	$data = null;	for ($i=0;$i<$len;$i+=2)	{		//echo "<br>::".substr($str,$i,2);		echo "<br>".hexdec(substr($str,$i,2)).":::".chr(hexdec(substr($str,$i,2)))."->".md5(chr(hexdec(substr($str,$i,2))));		$data.=chr(hexdec(substr($str,$i,2)));	}	echo "<br>".md5($data)."<br>";	return $data;}?>

import java.math.BigInteger;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;public class utils {	public static void main(String[] args) {				utils u=new utils();				String up=u.jspassword("123456", "\\x00\\x00\\x00\\x00\\x16\\x9d\\x56\\x75", "!PRY", true);		System.out.println("-----------------------------");		System.out.println(up);	}				public String jspassword(String password,String pt,String vc,boolean md5){				if(md5)		{			password = utils.md5(password).toUpperCase();		}		int len =password.length();		String temp="";				for (int i=0; i < len ; i = i + 2)		{									temp += "\\x"+password.substring(i, i+2);		}						return (utils.md5(utils.md5(utils.hex2asc(temp)+utils.hex2asc(pt)) .toUpperCase()+vc) ).toUpperCase();			}		public static String hex2asc(String str){		String [] s=str.trim().split("\\\\x");		//System.out.println(s.length);		StringBuffer sb=new StringBuffer();		for(String sItem:s){			//System.out.println(sItem);			sb.append(sItem);		}		int len = sb.toString().length();				//String data = null;		StringBuffer sb1=new StringBuffer();				for (int i=0;i<len;i+=2)		{			int x=Integer.parseInt(sb.toString().substring(i, i+2),16);			char ss=(char) x;						System.out.println(x+"::"+ss+"转换后->"+utils.md5(String.valueOf(ss)));						sb1.append(String.valueOf(ss));		}				return sb1.toString();	}		public static String md5(String plainText) {						byte[] secretBytes = null;		try {			secretBytes = MessageDigest.getInstance("md5").digest(					plainText.getBytes());		} catch (NoSuchAlgorithmException e) {			throw new RuntimeException("没有md5这个算法！");		}		String md5code = new BigInteger(1, secretBytes).toString(16);		for (int i = 0; i < 32 - md5code.length(); i++) {			md5code = "0" + md5code;		}		return md5code;	}			}

function jspassword($p,$pt,$vc,$md5 = true)
{
echo $p.":".$pt.":".$vc;
if($md5)
{
$p = strtoupper(md5($p));
}
//echo "
".$p;exit;
$len = strlen($p);
$temp = null;
//echo "
md5Password:".$p."
";
for ($i=0; $i < $len ; $i = $i + 2)
{
//echo "
i:".$i;
$temp .= '\x'.substr($p, $i,2);
}
//echo "
".$temp."
";
//echo "


--->>>".md5(hex2asc($temp).hex2asc($pt));
//$str=hex2asc($temp).hex2asc($pt);
//echo "
内部:".$str."-->".md5(hex2asc($temp))."-->".md5(hex2asc($pt));
return strtoupper(md5(strtoupper(md5(hex2asc($temp).hex2asc($pt))).$vc));
}

/**
* 十六进制转字符
*
* @access private
* @param string $str
* @return string
*/
function hex2asc($str)
{
//echo "处理前：".$str."
";
//print_r( explode('\x', $str));
$str = join('', explode('\x', $str));
//echo "
处理后:".$str;
$len = strlen($str);
$data = null;
for ($i=0;$i<$len;$i+=2)
{
//echo "
::".substr($str,$i,2);
echo "
".hexdec(substr($str,$i,2)).":::".chr(hexdec(substr($str,$i,2)))."->".md5(chr(hexdec(substr($str,$i,2))));
$data.=chr(hexdec(substr($str,$i,2)));
}
echo "
".md5($data)."
";
return $data;
}
?>


[/code]

import java.math.BigInteger;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;public class utils {	public static void main(String[] args) {				utils u=new utils();				String up=u.jspassword("123456", "\\x00\\x00\\x00\\x00\\x16\\x9d\\x56\\x75", "!PRY", true);		System.out.println("-----------------------------");		System.out.println(up);	}				public String jspassword(String password,String pt,String vc,boolean md5){				if(md5)		{			password = utils.md5(password).toUpperCase();		}		int len =password.length();		String temp="";				for (int i=0; i < len ; i = i + 2)		{									temp += "\\x"+password.substring(i, i+2);		}						return (utils.md5(utils.md5(utils.hex2asc(temp)+utils.hex2asc(pt)) .toUpperCase()+vc) ).toUpperCase();			}		public static String hex2asc(String str){		String [] s=str.trim().split("\\\\x");		//System.out.println(s.length);		StringBuffer sb=new StringBuffer();		for(String sItem:s){			//System.out.println(sItem);			sb.append(sItem);		}		int len = sb.toString().length();				//String data = null;		StringBuffer sb1=new StringBuffer();				for (int i=0;i<len;i+=2)		{			int x=Integer.parseInt(sb.toString().substring(i, i+2),16);			char ss=(char) x;						System.out.println(x+"::"+ss+"转换后->"+utils.md5(String.valueOf(ss)));						sb1.append(String.valueOf(ss));		}				return sb1.toString();	}		public static String md5(String plainText) {						byte[] secretBytes = null;		try {			secretBytes = MessageDigest.getInstance("md5").digest(					plainText.getBytes());		} catch (NoSuchAlgorithmException e) {			throw new RuntimeException("没有md5这个算法！");		}		String md5code = new BigInteger(1, secretBytes).toString(16);		for (int i = 0; i < 32 - md5code.length(); i++) {			md5code = "0" + md5code;		}		return md5code;	}			}

不知道为什么要
for (int i = 0; i < 32 - md5code.length(); i++) {
md5code = "0" + md5code;
}
而且终值还始终在变

  public static String getMd5(byte[] buffer) throws NoSuchAlgorithmException{    String s  = null;    char hexDigist[] = {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};    MessageDigest md = MessageDigest.getInstance("MD5");    md.update(buffer);    byte[] datas = md.digest(); //16个字节的长整数    char[] str = new char[2*16];    int k = 0;    for(int i=0;i<16;i++){      byte b   = datas[i];      str[k++] = hexDigist[b>>>4 & 0xf];//高4位      str[k++] = hexDigist[b & 0xf];//低4位    }    s = new String(str);    return s;  }

java中的MD5返回的是一个128位的长整形数,即16个字节,一个字节映射成2个字符,所以就是32个字符,md5 不可能不一样的都是遵循md5协议实现的,只是PHP在底层用C语言实现了
这里测试下:
java：

 public static void main(String[] args) {    try {      System.out.println(getMd5("123".getBytes()));    } catch (NoSuchAlgorithmException e) {      // TODO Auto-generated catch block      e.printStackTrace();    }  }

输出:
202cb962ac59075b964b07152d234b70
PHP代码:

echo md5("123");

输出:
202cb962ac59075b964b07152d234b70

我把php和java代码全部贴出来吧

<?php//php为正确的 结果：CA15B8C6D72A4442942045956DD371F8$password="123456";$pt='\x00\x00\x00\x00\x16\x9d\x56\x75';$vc='!PRY';$passwd = jspassword($password,$pt, $vc);echo "<br>结果：".$pt."<br>".$vc."<br>密码：".$passwd."<br><br>";function jspassword($p,$pt,$vc,$md5 = true){	echo $p.":".$pt.":".$vc;	if($md5)	{		$p = strtoupper(md5($p));	}	//echo "<br>".$p;exit;	$len = strlen($p);	$temp = null;	//echo "<br>md5Password:".$p."<br>";	for ($i=0; $i < $len ; $i = $i + 2)	{		//echo "<br>i:".$i;		$temp .= '\x'.substr($p, $i,2);	}	//echo "<br>".$temp."<br>";	//echo "<br><br><br>--->>>".md5(hex2asc($temp).hex2asc($pt));	//$str=hex2asc($temp).hex2asc($pt);	//echo "<br>内部:".$str."-->".md5(hex2asc($temp))."-->".md5(hex2asc($pt));	return strtoupper(md5(strtoupper(md5(hex2asc($temp).hex2asc($pt))).$vc));}/** * 十六进制转字符 *  * @access private * @param string $str * @return string */function hex2asc($str){	//echo "处理前：".$str."<br>";	//print_r( explode('\x', $str));	$str = join('', explode('\x', $str));	//echo "<br>处理后:".$str;	$len = strlen($str);	$data = null;	for ($i=0;$i<$len;$i+=2)	{		//echo "<br>::".substr($str,$i,2);		echo "<br>".hexdec(substr($str,$i,2)).":::".chr(hexdec(substr($str,$i,2)))."->".md5(chr(hexdec(substr($str,$i,2))));		$data.=chr(hexdec(substr($str,$i,2)));	}	echo "<br>".md5($data)."<br>";	return $data;}?>

import java.math.BigInteger;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;public class utils {	public static void main(String[] args) {				utils u=new utils();				String up=u.jspassword("123456", "\\x00\\x00\\x00\\x00\\x16\\x9d\\x56\\x75", "!PRY", true);		System.out.println("-----------------------------");		System.out.println(up);	}				public String jspassword(String password,String pt,String vc,boolean md5){				if(md5)		{			password = utils.md5(password).toUpperCase();		}		int len =password.length();		String temp="";				for (int i=0; i < len ; i = i + 2)		{									temp += "\\x"+password.substring(i, i+2);		}						return (utils.md5(utils.md5(utils.hex2asc(temp)+utils.hex2asc(pt)) .toUpperCase()+vc) ).toUpperCase();			}		public static String hex2asc(String str){		String [] s=str.trim().split("\\\\x");		//System.out.println(s.length);		StringBuffer sb=new StringBuffer();		for(String sItem:s){			//System.out.println(sItem);			sb.append(sItem);		}		int len = sb.toString().length();				//String data = null;		StringBuffer sb1=new StringBuffer();				for (int i=0;i<len;i+=2)		{			int x=Integer.parseInt(sb.toString().substring(i, i+2),16);			char ss=(char) x;						System.out.println(x+"::"+ss+"转换后->"+utils.md5(String.valueOf(ss)));						sb1.append(String.valueOf(ss));		}				return sb1.toString();	}		public static String md5(String plainText) {						byte[] secretBytes = null;		try {			secretBytes = MessageDigest.getInstance("md5").digest(					plainText.getBytes());		} catch (NoSuchAlgorithmException e) {			throw new RuntimeException("没有md5这个算法！");		}		String md5code = new BigInteger(1, secretBytes).toString(16);		for (int i = 0; i < 32 - md5code.length(); i++) {			md5code = "0" + md5code;		}		return md5code;	}			}

java在测试的时候传入的byte数组哦,要调用string.getBytes()方法 ，这个我测试是可以通过的  我也是这两天才开始学习java的 如果是编码的问题我就不知道怎么解决了

编码不对 换下试试