Category: Open C/C++

This page was last modified 13:29, 29 May 2008.

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Introduction

libcrypt is used for encrypting/decrypting of messages,passwords and blocks of data.

Functions

The main cryptographic functions in this lib are:

• setkey
  • An utility which adds, updates, dumps, or flushes Security Association Database (SAD) entries as well as Security Policy Database (SPD) entries in the kernel.

• encrypt
  • encrypt() function encrypts and decrypts64-bit messages. The algorithm used to perform encryption/decryption is Data Encryption Standard (DES).
  • The encrypt and setkey functions do not return any value.
  • setkey() is invoked to set the key for the DES machine.
  • If encrypt is called without priorly invoking setkey the implementation assumes a bit vector consisting of all zeroes as the key for the DES algorithm.

#include <unistd.h>  
  void encrypt (char datablock[64], int flag);
 
#include <stdlib.h>  
  void setkey (const char *key);

• crypt
  • The crypt function performs password hashing.
  • The crypt function returns a pointer to the encrypted value on success, and NULL on failure.
  • Currently the implementation supports Data Encryption Standard (DES) and MD5 hash algorithms

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

Links

• Open C library

• Open C Description

• libglib

• libpthread