ecb_crypt(3EXT) Extended Library Functions ecb_crypt(3EXT)NAME
ecb_crypt, cbc_crypt, des_setparity, DES_FAILED - fast DES encryption
SYNOPSIS
#include <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);
int DES_FAILED(int stat);
DESCRIPTIONecb_crypt() and cbc_crypt() implement the NBS DES (Data Encryption
Standard). These routines are faster and more general purpose than
crypt(3C). They also are able to utilize DES hardware if it is avail‐
able. ecb_crypt() encrypts in ECB (Electronic Code Book) mode, which
encrypts blocks of data independently. cbc_crypt() 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.
The first parameter, 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 parameter, data, contains the data to be
encrypted or decrypted. The third parameter, datalen, is the length in
bytes of data, which must be a multiple of 8. The fourth parameter,
mode, is formed by OR'ing together the DES_ENCRYPT or DES_DECRYPT to
specify the encryption direction and DES_HW or DES_SW to specify soft‐
ware or hardware encryption. 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 parameter ivec is the 8-byte initialization vector
for the chaining. It is updated to the next initialization vector upon
successful return.
RETURN VALUES
Given a result status stat, the macro DES_FAILED is false only for the
first two statuses.
DESERR_NONE No error.
DESERR_NOHWDEVICE Encryption succeeded, but done in software instead
of the requested hardware.
DESERR_HWERROR An error occurred in the hardware or driver.
DESERR_BADPARAM Bad parameter to routine.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│MT-Level │MT-Safe │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOcrypt(3C), attributes(5)NOTES
When compiling multi-thread applications, the _REENTRANT flag must be
defined on the compile line. This flag should only be used in multi-
thread applications.
SunOS 5.11 3 Mar 2008 ecb_crypt(3EXT)