I'm developing an ASP.NET application using SQL Server Stored Procedures. I need to hash my login password and resolve it in my sp_LoginCheck Stored Procedure.
I have already inserted data in the database.
I want to encrypt or hash whatsoever the password then decrypt it in the stored procedure and query the table so that I can acquire the data.
Best How To :
A very simple aproach is to use a MD5 hash.
public class MD5
public static string Hash(string message)
// step 1, calculate MD5 hash from input
System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create();
byte inputBytes = System.Text.Encoding.ASCII.GetBytes(message);
byte hash = md5.ComputeHash(inputBytes);
// step 2, convert byte array to hex string
StringBuilder sb = new StringBuilder();
for (int i = 0; i < hash.Length; i++)
Then in your application
var password = MD5.hash(passwordField);
And store that in the DB.
When validating the password you just say something like
db.Account.Where(w => w.email == emailField && w.password == MD5.hash(passwordField)
to see if you have a matching record.
As @zulq said there are better systems something that has a salt etc, however for basic password hashing as you requested, this will work.
However if you wish to do all this in a stored procedure. You can use the following HASHBYTES function in SQL
HASHBYTES('md5', 'your password')
So same again when calling the stored procedure, you pass it the plain text password it hashes and stores
When validating you pass a stored procedure the username / password it validates and returns true or false or a row.