|DES_CRYPT(3)||Library Functions Manual||DES_CRYPT(3)|
*key, char *data,
*key, char *data,
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
DES_DECRYPT. For software versus hardware
encryption, OR in either
specified, and there is no hardware, then the encryption is performed in
software and the routine returns
cbc_crypt(), the ivec
argument is the 8-byte initialization vector for the chaining. It is updated
to the next initialization vector upon return.
- No error.
- Encryption succeeded, but done in software instead of the requested hardware.
- An error occurred in the hardware or driver.
- Bad argument to routine.
Given a result status stat, the macro
DES_FAILED(stat) is false only
for the first two statuses.
des_setparity() functions are part of libtirpc.
RESTRICTIONS¶These routines are not available in RPCSRC 4.0. This information is provided to describe the DES interface expected by Secure RPC.
|October 6, 1987||Linux 4.19.0-6-amd64|