Pwgen syntax software#
Pwgen syntax code#
Pwgen syntax password#

arg: cmp al, ' ' Space? je doarg Then get next character cmp al, '/' Option? je opt dec byte Otherwise, it's an argument jnz rdnum Read a number if we still need one jmp usage Otherwise, incorrect arguments rdnum: xor bp, bp Place to keep number. arg If not, there are arguments left jmp check If so, we're done.

text org 100 h mov ah, gettim Seed the RNG using the system time int 21 h (in case of no argument) mov, cx mov, dx mov si, arg See if we have any arguments lodsb test al, al jnz hasarg jmp usage If not, print usage string Parse the command line arguments hasarg: xor bx, bx We do, zero-terminate the string xchg al, bl mov, al mov di, count Place to start reading arguments doarg: lodsb Get argument byte.

Pwgen syntax code#

The X register is loaded with the password's length (in this case, 20 characters, not counting the null terminator.)Ĭpu 8086 bits 16 MS-DOS syscalls gettim: equ 2 Ch Get system time write: equ 40 h Write to file exit: equ 4 Ch Exit with return code MS-DOS process data arg: equ 80 h Command line argument (length + string) ěIOS calls conout: equ 0 Eh Write character to console vstate: equ 0 Fh Get current video state section. The screen can only display colored pixels, and the top 4 bytes are masked off, so this is just a visual aid to show the process in action.

Pwgen syntax password#

Unfortunately, easy6502 cannot display text, but it does have a random number generator, so this example merely contains the logic for generating the password itself.

capital eye, lowercase ell, the digit one.

You may also allow the user to specify a seed value, and give the option of excluding visually similar characters.įor example: Il1 O0 5S 2Z where the characters are: The program should implement a help option or button which should describe the program and options when invoked. The randomness should be from a system source or library. The passwords should be displayed or written to a file, one per line. The user must be able to specify the password length and the number of passwords to generate. The generated password(s) must include at least one (of each of the four groups): Other printable characters: above character list excludes white-space, backslash and grave)

Pwgen syntax software#

These are named after the software that generates passwords matching these patterns.You are encouraged to solve this task according to the task description, using any language you may know.Ĭreate a password generation program which will generate passwords containing random ASCII characters from the following groups: If this syntax is too complicated for you, the passgen binary also comes with some pattern presets, that you can use with the -p flag. This is a language that is often used for filtering or searching text-based content. I'm also a very happy used of regular expressions. I wanted it to be very flexible, so that you can easily create passwords with different shapes (like, 16 alphanumeric characters, or 4 english words). Popular computer comic XKCD #936 notes that long word-based passwords have more strength and memorability than special-character-based passwords:īased on this, I wanted to set out to build a tool that could help with generating random, strong passwords with different shapes.

While previously, the advice was to use password policies (such as enforcing the use of special characters), current best practice is to avoid that 2, and instead to encourage long passwords. Ideally, passwords should be as long as possible 1. Choosing simpler passwords or reusing them across accounts makes dealing with them easier, but compromises their security. On the other hand, losing them means losing data or access to accounts. On the one hand, they are necessary for authenticating with services, and for decrypting drives. I have a bit of a love-hate relationship with passwords.