crypt - encode strings using algorithms

Syntax

#include <unistd.h> char *crypt(const char *key, const char *salt);

Description crypt() is a string encoding function. It is based on a one-way encoding algorithm with

	variations intended to prevent the use of hardware implementations for a key search. key is the input string to be encoded, typically a user's password. salt is a two-character string chosen from the set of characters (a-z, A-Z, 0-9, . , /). This string is used to vary the encoding algorithm in one of 4096 different ways, after which the input string is used as the key to repeatedly encode a constant string. The returned value points to the encoded input string.
Return val.	Pointer to the encoded string.
		The first two characters of the returned value are those of the salt argument.
	Null pointer	if an error occurs; errno is set to indicate the error.
Notes See also	The return value of crypt() points to static data that is overwritten at each call. encrypt(), setkey(), unistd.h.