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PHP - Hash Collision With Random Key
Hello, I created a system where emails get encrypted with a random key that gets stored in a database, what are the odds of the Hashes Colliding?
Part of the code: function genRandomString($num) { $length = $num; $characters = '0123456789abcdefghijklmnopqrstuvwxyz'; $string = ""; for ($p = 0; $p < $length; $p++) { $string .= $characters[mt_rand(0, strlen($characters))]; } return $string; } $Key=genRandomString(10); $email_s=hash_hmac('ripemd160', $email, $Key); Thankyou, GB. Similar TutorialsOkay, real simple issue, hopefully someone has a simple solution. I have a single web page that needs to connect to TWO different databases. I've written everything in OO, and I'm getting a crazy situation where vars seem to be bleeding into each other. The problem goes like follows: I declare two SEPARATE database instances like so: require_once '/blah/classes/db/class.DBCMS.php'; require_once '/blah/classes/db/class.DBC.php'; $db1 = new DBC(); $db2 = new DBCMS(); I then pass in the $db(n) variables to a separate class to be used to process data like so: $publisher = new htmlCreator1($db1); $publisher = new htmlCreator2($db2); My problem is thus: INSIDE the respective different classes, my references to the $db vars seem to be colliding between instances. So $this->db->connection from db2 is referencing db1. The objects are defined like so: class htmlCreator1 { var $db; function __construct($db) { $this->db = $db; } } Shouldn't the respective $this->db's maintain their own namespace without extra work? I'm getting errors saying that tables in db2 aren't in db1 because of this collision as per the internal db instance vars. I have experimented with renaming all respective vars to unique names and still get the error. I'm crazy aren't I? Any help would be greatly appreciated. thanks, Dr. Hello, my first post here. I created a Validation class that depends entirely on static methods. It appears to be working well, but perhaps I misunderstood exactly the purpose and the consequences of using static methods. My class essentially looks like this: class Validate { static public $errors = array(); static public $valid = array(); static public function Name($name) { if ($name != '') { self::$valid['name'] = $name; return true; } else { self::$errors['name'] = 'Name is empty'; return false; } } } Does this create any chance whatsoever for a collision of data from multiple users? I am beginning to think it does, simply because from what I have recently learned about static methods, theyr'e essentially global variables because they are not instantiated. If that's the case, then it would seem possible that during times of heavy use, any application depending on this class would confuse submitted data. Any thoughts? Thanks in advance. Guys, Having a major headache here. I need to send an enquiry using jquery and php. The user can only send an enquiry if they are logged in - so it's a one click process. On the click (which is an <a> tag) the user's data is retrieved from the database and sent to the company they are enquiring about. When the link is clicked, a jquery popup is shown to notify the user that the enquiry has been sent. This all works. However, currently the enquiry is sent when the page loads and this is what I'm having trouble with. Code: [Select] <a href="#e" onclick="openinfobox('Enquiry Sent', 1)" class="enq"></a>What I want to do is say if the URL contains #e, then send the enquiry, otherwise do nothing. I understand that the # portion of the url cannot be referenced by PHP. How on earth can I run php process to say only run this php process if there is a # in the url? Is a hash array the same thing as an associative array? My PHP books make no reference to this, yet I have seen the term referred to. Thanks. Are there any PHP hashes that are extremely secure and that CANNOT be reverse-engineered?
I have a section on my website where the url points to www.example.com/some_page#some_element #some_element is used by javascript to load the element in question into the parent element. However i need pagination done on this loaded element. How should i go about it? would it work? obv i cant use www.example.com/some_page#some_element/page/2. Any tips or advice? As above, I have a lottery style site that picks a random number between 1-8 but my users complain for some reason that this is not enough. So i was told to look into using fopen and random.org to generate a random number. Anyone have experience of this and perhaps a code snippet for me to look at and possibly use? help will be appreciated. Hi SMF forum use semi-colom in url for example http://www.phpfreaks.com/forums/profile/?area=showposts;u=71740 after showposts there is semi-colon. Sometimes use hash(#) how can i do this with superglobal $_GET??? When a User changes his/her Email Address, should I generate a new Salt and Hash? (I am re-using the code I used for a Password Reset, and during that I generated a new Salt and Hash for security. I guess it can't hurt...) Thanks, Debbie HI, I have a registration script where a password is made with one hash, and a user password reset page that uses another hash. I don't know how to make them the same, as every time I change them, it messes up the code and I get errors. I will comment the parts that I think need changing. Because when I try to log in with the new password that was made by the reset password script, it says "wrong username or password" because either it wasn't updated in the database, or it was updated in a bad way. Any help greatly appreciated. The password email reset code: Code: [Select] <?php define('IN_SCRIPT', true); // Start a session session_start(); ini_set ("display_errors", "1"); error_reporting(E_ALL); $host = ""; $database = ""; $username = ""; $password = ""; $tbl_name = ""; $conn = mysql_connect($host, $username, $password) or die("Could not connect: " . mysql_error()); if($conn) { mysql_select_db($database); echo "connected to database!!"; } else { echo "failed to select database"; } //this function will display error messages in alert boxes, used for login forms so if a field is invalid it will still keep the info //use error('foobar'); function error($msg) { ?> <html> <head> <script language="JavaScript"> <!-- alert("<?=$msg?>"); history.back(); //--> </script> </head> <body> </body> </html> <? exit; } //This functions checks and makes sure the email address that is being added to database is valid in format. function check_email_address($email) { // First, we check that there's one @ symbol, and that the lengths are right if (!ereg("^[^@]{1,64}@[^@]{1,255}$", $email)) { // Email invalid because wrong number of characters in one section, or wrong number of @ symbols. return false; } // Split it into sections to make life easier $email_array = explode("@", $email); $local_array = explode(".", $email_array[0]); for ($i = 0; $i < sizeof($local_array); $i++) { if (!ereg("^(([A-Za-z0-9!#$%&'*+/=?^_`{|}~-][A-Za-z0-9!#$%&'*+/=?^_`{|}~\.-]{0,63})|(\"[^(\\|\")]{0,62}\"))$", $local_array[$i])) { return false; } } if (!ereg("^\[?[0-9\.]+\]?$", $email_array[1])) { // Check if domain is IP. If not, it should be valid domain name $domain_array = explode(".", $email_array[1]); if (sizeof($domain_array) < 2) { return false; // Not enough parts to domain } for ($i = 0; $i < sizeof($domain_array); $i++) { if (!ereg("^(([A-Za-z0-9][A-Za-z0-9-]{0,61}[A-Za-z0-9])|([A-Za-z0-9]+))$", $domain_array[$i])) { return false; } } } return true; } if (isset($_POST['submit'])) { if ($_POST['forgotpassword']=='') { error('Please Fill in Email.'); } if(get_magic_quotes_gpc()) { $forgotpassword = htmlspecialchars(stripslashes($_POST['forgotpassword'])); } else { $forgotpassword = htmlspecialchars($_POST['forgotpassword']); } //Make sure it's a valid email address, last thing we want is some sort of exploit! if (!check_email_address($_POST['forgotpassword'])) { error('Email Not Valid - Must be in format of name@domain.tld'); } // Lets see if the email exists $sql = "SELECT COUNT(*) FROM users WHERE email = '$forgotpassword'"; $result = mysql_query($sql)or die('Could not find member: ' . mysql_error()); if (!mysql_result($result,0,0)>0) { error('Email Not Found!'); } //Generate a RANDOM MD5 Hash for a password//THIS IS THE POSSIBLE PROBLEM $random_password=md5(uniqid(rand())); //Take the first 8 digits and use them as the password we intend to email the user $emailpassword=substr($random_password, 0, 8); //Encrypt $emailpassword in MD5 format for the database $newpassword = md5($emailpassword); // Make a safe query $newpassword = mysql_real_escape_string($newpassword); $query = sprintf("UPDATE 'users' SET 'password' = '$newpassword' WHERE 'email' = '$forgotpassword'"); //Email out the infromation $site_name = "mysite.COM"; $site_email = "noreply@mysite.COM"; $subject = "Your New Password"; $message = "Your new password is as follows: ---------------------------- Password: $emailpassword ---------------------------- Please make note this information has been encrypted into our database This email was automatically generated."; if(!mail($forgotpassword, $subject, $message, "FROM: $site_name <$site_email>")){ die ("Sending Email Failed, Please Contact Site Admin! ($site_email)"); }else{ error('New Password Sent!.'); } } else { ?> <form name="forgotpasswordform" action="" method="post"> <table border="0" cellspacing="0" cellpadding="3" width="100%"> <caption> <div>Forgot Password</div> </caption> <tr> <td>Email Address:</td> <td><input name="forgotpassword" type="text" value="" id="forgotpassword" /></td> </tr> <tr> <td colspan="2" class="footer"><input type="submit" name="submit" value="Submit" class="mainoption" /></td> </tr> </table> </form> <? } ?> And now for the registration and password creation script Code: [Select] <?php $host = " "; $database = " "; $username = " "; $password = " "; mysql_connect($host, $username, $password) or die("Could not connect: " . mysql_error()); mysql_select_db($database); if ($_POST['form_submitted'] == '1') { ##User is registering, insert data until we can activate it $activationKey = mt_rand() . mt_rand() . mt_rand() . mt_rand() . mt_rand(); $username = mysql_real_escape_string($_POST[username]); $email = mysql_real_escape_string($_POST[email]); ////////////////////////////////////////////////////////////////////////// $username= $_POST['username']; $checkuser = mysql_query("SELECT username FROM users WHERE username='$username'"); $username_exist = mysql_num_rows($checkuser); if($username_exist > 0){ echo "I'm sorry but the username you specified has already been taken. Please pick another one."; unset($username); $sendemail='0'; } /////////////////////////////////////////////////////////////////////////////////// $email= $_POST['email']; $checkemail = mysql_query("SELECT email FROM users WHERE email='$email'"); $useremail_exist = mysql_num_rows($checkemail); if($useremail_exist > 0){ echo "I'm sorry but the email address you specified has already been taken. Please pick another one."; unset($email); $sendemail='0'; } ////////////////////////////////////////////////////////////////////////////// if ( $_POST['password'] == $_POST['password2'] && $username_exists <=0 && $useremail_exist <= 0) { $password = sha1($_POST['password']); $sql="INSERT INTO users (username, password, email, activationkey, status) VALUES ('$username', '$password', '$email', '$activationKey', 'verify')"; $sendemail = '1'; } else { echo "*Passwords do not match!"; $sendemail='0'; } if (!mysql_query($sql)) { die('Error: ' . mysql_error()); } $_POST['form_submitted'] = '0'; //make form disappear. if ($sendemail =='1') { echo "An email has been sent to $_POST[email] with an activation key. Please check your mail to complete registration."; } ##Send activation Email $to = $_POST[email]; $subject = " Registration"; $message = "Welcome to our website! verify_user.php?$activationKey\r\rIf this is an error, ignore this email and you will be removed from our mailing list.\r\rRegards,\ Team"; $headers = 'From: noreply@r.com' . "\r\n" . 'Reply-To: noreply@r.com' . "\r\n" . 'X-Mailer: PHP/' . phpversion(); mail($to, $subject, $message, $headers); } else { ##User isn't registering, check verify code and change activation code to null, status to activated on success $queryString = $_SERVER['QUERY_STRING']; $query = "SELECT * FROM users"; $result = mysql_query($query) or die(mysql_error()); /*if*/ while($row = mysql_fetch_array($result)){ if ($queryString == $row["activationkey"]){ $_POST['form_submitted'] = '2'; //make form disappear. echo "Congratulations!" . $row["username"] . " is now the proud new owner of an e.com account. Please sign in to the site at <a href='sign_in.php'>THIS LINK</a>. "; $sql=" UPDATE users SET status='activated' WHERE (id = $row[id])"; //UPDATE users SET activationkey = '', //$sql="UPDATE users SET activationkey = 'Done-$row[id]', status='activated' WHERE (id = $row[id])"; if (!mysql_query($sql)) { die('Error: ' . mysql_error()); } } } } ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Untitled Document</title> <style type="text/css"> <!-- .style1 { font-size: large; font-weight: bold; } .style3 {font-size: large} --> </style> </head> <body> <?php if (!isset ($_POST['form_submitted'])){ echo (' <div align="center"><span class="style3"> Please register. </span> <table border="0"> <form action="verify_user.php" method="post" name="register"> <tr><td>Username: <input type="text" name="username" maxlength="20"></td></tr> <tr><td>Password:<input type="password" name="password" /></td><td> <tr><td>Confirm password: <input type="password" name="password2" maxlength="20"></td><td> <tr><td> Email: <input type="text" name="email" /></td></tr> <input type="hidden" name="form_submitted" value="1"/> <tr><td><input type="submit" value="Submit" /></td></tr> </form> </table> </div>'); } if ( $_POST['form_submitted'] =='2'){ echo (" You may now enter the site!");//echo nothing no form. } ?> </body> </html> What is the difference between the hash algo "tiger192,3" and "tiger192,4"? I ran fsum/HashCalc to get a TIGER hash from a string and it is different with either "tiger192,3" or "tiger192,4". I also tried using the hash as hex string input to rehash 3 or 4 times, but still cannot get an equivalent to that of "tiger192,3" or "tiger192,4"... Hi,
I am trying to get this script to execute as an administrator of an online system. If a user has forgotten their password, I enter their username and enter a new password which they can update later. I am not sure why this is not updating the password for the username entered?
<?php
// Initialize the session
session_start();
// Check if the user is logged in, if not then redirect to login page
if(!isset($_SESSION["loggedin"]) || $_SESSION["loggedin"] !== true){
header("location: login.php");
exit;
}
// Include config file
require_once "config.php";
// Define variables and initialize with empty values
$new_password = $confirm_password = "";
$new_password_err = $confirm_password_err = "";
// Processing form data when form is submitted
if($_SERVER["REQUEST_METHOD"] == "POST"){
// Validate new password
if(empty(trim($_POST["new_password"]))){
$new_password_err = "Please enter the new password.";
} elseif(strlen(trim($_POST["new_password"])) < 6){
$new_password_err = "Password must have atleast 6 characters.";
} else{
$new_password = trim($_POST["new_password"]);
}
// Validate confirm password
if(empty(trim($_POST["confirm_password"]))){
$confirm_password_err = "Please confirm the password.";
} else{
$confirm_password = trim($_POST["confirm_password"]);
if(empty($new_password_err) && ($new_password != $confirm_password)){
$confirm_password_err = "Password did not match.";
}
}
// Check input errors before updating the database
if(empty($new_password_err) && empty($confirm_password_err)){
// Prepare an update statement
$sql = "UPDATE User_Accounts_ SET password = ? WHERE username = ?";
if($stmt = mysqli_prepare($link, $sql)){
// Bind variables to the prepared statement as parameters
mysqli_stmt_bind_param($stmt, "ss", $param_password, $username);
// Set parameters
$param_password = password_hash($new_password, PASSWORD_DEFAULT);
$username = $_POST['username'];
// Attempt to execute the prepared statement
if(mysqli_stmt_execute($stmt)){
// Password updated successfully. Destroy the session, and redirect to login page
session_destroy();
header("location: login.php");
exit();
} else{
echo "Oops! Something went wrong. Please try again later.";
}
// Close statement
mysqli_stmt_close($stmt);
}
}
// Close connection
mysqli_close($link);
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Reset Password</title>
<style type="text/css">
body{ font: 14px sans-serif; }
.wrapper{ width: 350px; padding: 20px; }
</style>
</head>
<body>
<div class="wrapper">
<h2>Reset Password</h2>
<p>Please fill out this form to reset your password.</p>
<p><strong>Username</strong>
<input type="text" name="username" class="form-control">
</p>
<p> </p>
<form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>" method="post">
<div class="form-group <?php echo (!empty($new_password_err)) ? 'has-error' : ''; ?>">
<label>New Password</label>
<input type="password" name="new_password" class="form-control" value="<?php echo $new_password; ?>">
<span class="help-block"><?php echo $new_password_err; ?></span>
</div>
<div class="form-group <?php echo (!empty($confirm_password_err)) ? 'has-error' : ''; ?>">
<label>Confirm Password</label>
<input type="password" name="confirm_password" class="form-control">
<span class="help-block"><?php echo $confirm_password_err; ?></span>
</div>
<div class="form-group">
<input type="submit" class="btn btn-primary" value="Submit">
<a class="btn btn-link" href="welcome.php">Cancel</a>
</div>
</form>
</div>
</body>
</html>
Trying to echo a string that contains a hash symbol. Instead of getting a hash symbol, I get %29. The code I am using is pretty basic -->$idx="#" . $idxA;<--, but as stated, when I echo $idx, it comes out as %29. (All of this is part of a form, get, attempting to pass a bookmark to the receiving program. Thoughts? I have a login system Username and Password.
My password is encrypted with bcrypt, if it okay to store that bcrypt in a session as $_SESSION["hash"]
To verify that the user is who they say they are?
Or do i only need to do
$_SESSION["username"]
Hi,
Recently I've been trying writing a safe password hash and I wanted to know that if I use an MD5 hash at the end, just so it will be like some short of "packed",so instead of saving a 128 string, I'll use md5 to "pack" it into 32 characters and save up to 96 characters.
I know MD5 isn't safe and all, but the question is, does it lower the security ?
Also, would be happy for feedbacks about my password hash
function hash_($input,$key) {
$op=hash("whirlpool",hash("sha512",$key) . "$" . $input . "$" . hash("sha512",$key));Im using SMF forum im trying to connect (my software C#) and grand access from forum DB this is a hash from SMF sha1(strtolower($membername) . $password); Code: [Select] <?php include("config.php"); $user = "-1"; if (isset($_GET['user'])) { $user = $_GET['user']; } $pass = "-1"; if (isset($_GET['pass'])) { $pass = $_GET['pass']; } $ip = $_SERVER['REMOTE_ADDR']; $sql = "select id_member,count from smf_members where real_name='$user' and passwd=MD5('$pass')"; $results = mysql_query($sql, $con); $values = mysql_fetch_assoc($results); $user_id = $values['id_member']; $login=$values['count']; ?> MD5 working fine but how to use SMF hash to login? what would be the correct way to add an MD5 has to the following POST code? $_POST['pass'] = mysql_real_escape_string($_POST ['pass']); '".$_POST ['pass']."', thanks in advance! Im trying to access a page that uses a session hash in the url. How do I accomplish this. The url looks like: http://www.somesite.com/findagent/MapController.aspx?action=getAgentsByRadius&distance=5&filter=PL&sessionhash=%3F%01j%23%3Eo%0AH%05h%0B%3FU%0B%3F%3F%3F%7B%3F%3C&zip=91111 I guess getting the session id and urlencoding on my end wouldnt work? I would have to grab their session id and encode somehow? Hi Guys, I wonder If I can call on this forums help once again. I am trying to add salt to my md5 password hash. However I think I am getting the syntax slightly wrong as it is not working properly. It works in the fact that when someone logs in and they have a 1 next to the member type it will direct them to the teachers page . However if no values are entered into the log in form and someone clicks log in it will still direct them to the students page when I thought it would direct them to log in failed. The code for the log in form is: Code: [Select] //Sanitize the POST values $login = clean($_POST['login']); $password = clean($_POST['password']); $salt = "salt"; $EncryptedPassword=md5($password, $salt); //Create query $qry="SELECT * FROM users WHERE username='$login' AND password='$EncryptedPassword'"; $result=mysql_query($qry); //Check whether the query was successful or not if($result) { if(mysql_num_rows($result) == 1) { //Login Successful session_regenerate_id(); $member = mysql_fetch_assoc($result); $_SESSION['SESS_MEMBER_ID'] = $member['id']; $_SESSION['SESS_FIRST_NAME'] = $member['FirstName']; $_SESSION['SESS_LAST_NAME'] = $member['LastName']; $_SESSION['SESS_LAST_NAME'] = $member['Member_Type']; session_write_close(); } //if the member has an id equal to 0 send them to the member page if($member['Member_Type'] == 0){ header("Location: Student-Page.php"); //if the member has an id equal to 1 send them to the admin page } elseif($member['Member_Type'] == 1){ header("Location: Teachers-Page.php"); } // regardless of the outcome, we need to exit, so it can be done once after both checks exit(); } else { //Login failed header("location: login-failed.php"); exit(); } In case you need it the code for the registration form where the password is originally salted upon creation is: Code: [Select] <?php //Start session session_start(); //Include database connection details require_once('config.php'); //Connect to mysql server $link = mysql_connect(DB_HOST, DB_USER ,DB_PASSWORD); if(!$link) { die('Failed to connect to server: ' . mysql_error()); } //Select database $db = mysql_select_db(DB_DATABASE); if(!$db) { die("Unable to select database"); } //Function to sanitize values received from the form. Prevents SQL injection function clean($str) { $str = @trim($str); if(get_magic_quotes_gpc()) { $str = stripslashes($str); } return mysql_real_escape_string($str); } //Sanitize the POST values $username = clean($_POST['username']); $FirstName = clean($_POST['FirstName']); $LastName = clean($_POST['LastName']); $Member_Type = clean($_POST['Member_Type']); $password = clean($_POST['password']); $Cpassword = clean($_POST['Cpassword']); $salt = "salt"; $EncryptedPassword = md5($password,$salt); //Check for duplicate login ID if($username != '') { $qry = "SELECT * FROM users WHERE username='$username'"; $result = mysql_query($qry); if($result) { if(mysql_num_rows($result) > 0) { } @mysql_free_result($result); } else { //die("query failed"); } } //Create INSERT query $qry = "INSERT INTO users(username, password, FirstName, LastName, Member_Type) VALUES('$username','$EncryptedPassword','$FirstName','$LastName','$Member_Type')"; $result = @mysql_query($qry); //Check whether the query was successful or not if($result) { header("location: register-success.php"); exit(); }else { die("Query Failed"); } ?> If someone could take a look and point me in the right direction. Also if there are any other mistakes let me know I would be very grateful. Thanks in advance. Edd Specifically for hashing a password to be stored in a database. I know SHA1 and MD5 are essentially considered broken. I've been using MD5 with a salt value on all my projects but I'm starting a new project and wondering if there's a stronger algorithm I should be using? |
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