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SHA function – compare password doesn’t work
Hello everyone:
I am doing a exercise to compare user entry (password) with existing password saved in the database.
a)I used SHA() function to encrypt the password in insert command.
b) I also used SHA() in select clause to encrypt user entry password
I alwasy got an error message saying that wrong user password entered.
Please check my code and give me some suggestion on how to resolve this problem. Thanks!
table holds user_id and user_password two entry
[code]create table tbl_auth_user(
user_id varchar(10) NOT NULL,
user_password char(32) NOT NULL,
primary key (user_id)
);
insert into tbl_auth_user (user_id, user_password) VALUES (‘theadmin’, SHA(‘1234’));
PHP code:
[code=php]<?php
$errorMessage = ”;
$db_name = ‘pc_inventory’;
if(isset($_POST[‘userid’]) && isset($_POST[‘txt_password’]) )
{
//connect to database
$db_connect = mysql_connect(”, ‘root’, ”);
if($db_connect)
echo “you connected to the dabase<br />”;
else
die (‘connection to db failed’ . mysql_error());
//select database
$db_selection = mysql_select_db($db_name);
if($db_selection)
echo “$db_name being selected.<br />”;
else
die(“$db_name not selected” . mysql_error());
$userId = $_POST[‘userid’];
$password = $_POST[‘txt_password’];
echo “$userId / $password.<br />”;
// check if the user id and password combination exist in database
$sql = “SELECT user_id
FROM tbl_auth_user
WHERE user_id = ‘$userId’ AND user_password = SHA(‘$password’)”;
$result = mysql_query($sql) or die(‘Query failed. ‘ . mysql_error());
if(mysql_num_rows($result) == 1)
{
echo “user name and password exist in the database<br />”;
}
else
{
$errorMessage = ‘Sorry, wrong user id / password’;
}
}
?>
<html>
<title>
Password Funtion
</title>
<body>
<?php
if ($errorMessage != ”) {
?>
<p align=”center”><b><font color=”#990000″><?php echo $errorMessage; ?></font></b></p>
<?php
}
?>
<form name=”” id=”” action=”” method=”post”>
User ID:<input type=”text” name=”userid” id=”userid” value=”” /><br /><br />
Password:<input type=”password” name=”txt_password” id=”txt_password”><br /><br />
<input type=”submit” name=”submit” value=”Submit” />
</form>
</body>
</html>
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