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Java 与 PHP 的MD5加密为什么不一样？

程序员文章站 2024-01-25 12:03:46
...
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    

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             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>>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>>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  

结果：".$pt."
".$vc."
密码：".$passwd."

";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; $i i:".$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;$i::".substr($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;}?>
  


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 "+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   
   
   不知道为什么要   
        for (int i = 0; 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>>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  

结果：".$pt."
".$vc."
密码：".$passwd."

";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; $i i:".$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;$i::".substr($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;}?>
  


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 "+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   
  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; $i  {  
 //echo "
i:".$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;$i {  
 //echo "
::".substr($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 "+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   

   
    
不知道为什么要    
        for (int i = 0; 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>>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   

结果：".$pt."
".$vc."
密码：".$passwd."

";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; $i i:".$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;$i::".substr($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;}?>
   


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 "+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     

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
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