GSP
Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Support
Contact Us
Online Help
Handbooks
Domain Status
Man Pages

FAQ
Virtual Servers
Pricing
Billing
Technical

Network
Facilities
Connectivity
Topology Map

Miscellaneous
Server Agreement
Year 2038
Credits
 

USA Flag

 

 

Man Pages


Manual Reference Pages  -  CBC_CRYPT (3)

NAME

des_crypt, ecb_crypt, cbc_crypt, des_setparity - fast DES encryption

CONTENTS

Library
Synopsis
Description
Errors
See Also
Restrictions

LIBRARY


.Lb libc

SYNOPSIS


.In rpc/des_crypt.h int ecb_crypt char *key char *data unsigned datalen unsigned mode int cbc_crypt char *key char *data unsigned datalen unsigned mode char *ivec void des_setparity char *key

DESCRIPTION

The ecb_crypt and cbc_crypt functions implement the NBS DES (Data Encryption Standard). These routines are faster and more general purpose than crypt(3). They also are able to utilize DES hardware if it is available. The ecb_crypt function encrypts in ECB (Electronic Code Book) mode, which encrypts blocks of data independently. The cbc_crypt function encrypts in CBC (Cipher Block Chaining) mode, which chains together successive blocks. CBC mode protects against insertions, deletions and substitutions of blocks. Also, regularities in the clear text will not appear in the cipher text.

Here is how to use these routines. The first argument, key, is the 8-byte encryption key with parity. To set the key’s parity, which for DES is in the low bit of each byte, use des_setparity. The second argument, data, contains the data to be encrypted or decrypted. The third argument, datalen, is the length in bytes of data, which must be a multiple of 8. The fourth argument, mode, is formed by OR ’ing together some things. For the encryption direction OR in either DES_ENCRYPT or DES_DECRYPT. For software versus hardware encryption, OR in either DES_HW or DES_SW. If DES_HW is specified, and there is no hardware, then the encryption is performed in software and the routine returns DESERR_NOHWDEVICE. For cbc_crypt, the ivec argument is the 8-byte initialization vector for the chaining. It is updated to the next initialization vector upon return.

ERRORS

[DESERR_NONE] No error.
[DESERR_NOHWDEVICE] Encryption succeeded, but done in software instead of the requested hardware.
[DESERR_HWERR] An error occurred in the hardware or driver.
[DESERR_BADPARAM] Bad argument to routine.

Given a result status stat, the macro DES_FAILED stat is false only for the first two statuses.

SEE ALSO

crypt(3)

RESTRICTIONS

These routines are not available in RPCSRC 4.0. This information is provided to describe the DES interface expected by Secure RPC.
Search for    or go to Top of page |  Section 3 |  Main Index


Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with manServer 1.07.