What does crypt() do in C?

c crypt
CloudMeta picture CloudMeta · Jul 19, 2009 · Viewed 19.3k times · Source 
crypt(text,"k7")

I looked it up and apparently 'k7' is the salt, but I have no idea what that means nor what type of output will come from that, anyone know?

Answer

Adam Matan picture Adam Matan · Jul 19, 2009

From the crypt Man page.

Description

crypt() is the password encryption function. It is based on the Data Encryption Standard algorithm with variations intended (among other things) to discourage use of hardware implementations of a key search.

key is a user's typed password.

salt is a two-character string chosen from the set [a-zA-Z0-9./]. This string is used to perturb the algorithm in one of 4096 different ways.

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