CREATE PROC random_password ( @len int = 8, --Length of the password to be generated @password_type char(7) = 'simple' --Default is to generate a simple password with lowecase letters. --Pass anything other than 'simple' to generate a complex password. --The complex password includes numbers, special characters, upper case and lower case letters ) AS /************************************************************************************************* Copyright © 2001 Narayana Vyas Kondreddi. All rights reserved. Purpose: To generate a random password Written by: Narayana Vyas Kondreddi http://vyaskn.tripod.com Tested on: SQL Server 7.0 and SQL Server 2000 Date modified: March-29-2001 01:15 PM Email: vyaskn@hotmail.com Examples: To generate a simple password with a length of 8 characters: EXEC random_password To generate a simple password with 6 characters: EXEC random_password 6 To generate a complex password with 8 characters: EXEC random_password @Password_type = 'complex' To generate a comples password with 6 characters: EXEC random_password 6, 'complex' *************************************************************************************************/ BEGIN DECLARE @password varchar(25), @type tinyint, @bitmap char(6) SET @password='' SET @bitmap = 'uaeioy' --@bitmap contains all the vowels, which are a, e, i, o, u and y. These vowels are used to generate slightly readable/rememberable simple passwords WHILE @len > 0 BEGIN IF @password_type = 'simple' --Generating a simple password BEGIN IF (@len%2) = 0 --Appending a random vowel to @password SET @password = @password + SUBSTRING(@bitmap,CONVERT(int,ROUND(1 + (RAND() * (5)),0)),1) ELSE --Appending a random alphabet SET @password = @password + CHAR(ROUND(97 + (RAND() * (25)),0)) END ELSE --Generating a complex password BEGIN SET @type = ROUND(1 + (RAND() * (3)),0) IF @type = 1 --Appending a random lower case alphabet to @password SET @password = @password + CHAR(ROUND(97 + (RAND() * (25)),0)) ELSE IF @type = 2 --Appending a random upper case alphabet to @password SET @password = @password + CHAR(ROUND(65 + (RAND() * (25)),0)) ELSE IF @type = 3 --Appending a random number between 0 and 9 to @password SET @password = @password + CHAR(ROUND(48 + (RAND() * (9)),0)) ELSE IF @type = 4 --Appending a random special character to @password SET @password = @password + CHAR(ROUND(33 + (RAND() * (13)),0)) END SET @len = @len - 1 END SELECT @password --Here's the result END
