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cbc_crypt (3)
  • >> cbc_crypt (3) ( FreeBSD man: Библиотечные вызовы )
  • cbc_crypt (3) ( Русские man: Библиотечные вызовы )
  • cbc_crypt (3) ( Linux man: Библиотечные вызовы )

  • BSD mandoc
     

    NAME

    
    
    des_crypt , ecb_crypt , cbc_crypt , des_setparity
    
     - fast DES encryption
    
     
    

    LIBRARY

    Lb libc
    
     
    

    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);
     

    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, Fa 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, Fa data , contains the data to be encrypted or decrypted. The third argument, Fa datalen , is the length in bytes of Fa data , which must be a multiple of 8. The fourth argument, Fa 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 Er DESERR_NOHWDEVICE . For cbc_crypt (,);
    the Fa ivec argument is the 8-byte initialization vector for the chaining. It is updated to the next initialization vector upon return.  

    ERRORS

    Bq Er DESERR_NONE
    No error.
    Bq Er DESERR_NOHWDEVICE
    Encryption succeeded, but done in software instead of the requested hardware.
    Bq Er DESERR_HWERR
    An error occurred in the hardware or driver.
    Bq Er 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.


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    ERRORS
    SEE ALSO
    RESTRICTIONS


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