![]() Then the final DES key is used to perform count cumulative encryptions ofĪ 64-bit constant. For each additional group, the XOR of the group bitsĪnd the encryption of the DES key with itself becomes the next DES key. To form the DES key as follows: the first group of 56 bits becomes the The key isĭivided into groups of 8 characters (a short final group is null-padded)Īnd the low-order 7 bits of each character (56 bits per group) are used The salt is used to induce disorder in to the DES algorithm in one ofġ6777216 possible ways (specifically, if bit i of the salt is set thenīits i and i+24 are swapped in the DES ``E'' box output). The values 0 to 63 areĮncoded by the characters ``./0-9A-Za-z'', respectively. Both the iteration count and the salt are encoded with 6īits per character, least significant bits first. Of an underscore (``_'') followed by 4 bytes of iteration count and 4īytes of salt. In the DES case, the secondĪrgument to crypt() is a character array, 9 bytes in length, consisting Additional code has been added to deter key search attemptsĪnd to use stronger hashing algorithms. The DES encryption scheme is derived from the NBS Data Encryption With a fixed number of perturbations is selected. If setting begins with any other character, DES encryption If setting begins with the ``_''Ĭharacter, DES encryption with a user specified number of perturbations Moment a `$1' chooses MD5 hashing and a `$2' chooses Blowfish hashing Then a different algorithm is used depending on the number. If it begins with a string character (`$') and a number Used by crypt() is dependent upon the contents of the NUL-terminated The crypt() function performs password encryption. Int des_cipher( const char *in, char *out, long salt, int count) ![]() ![]() SYNOPSIS #include char * crypt( const char *key, const char *setting) NAME crypt, setkey, encrypt, des_setkey, des_cipher - password encryption It's for your privacy.ĬRYPT(3) Library Functions Manual CRYPT(3)
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