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     padlock — driver for the cryptographic functions and RNG in VIA C3, C7 and Eden processors


     To compile this driver into the kernel, place the following lines in your kernel
     configuration file:

           device crypto
           device padlock

     Alternatively, to load the driver as a module at boot time, place the following line in



     The C3 and Eden processor series from VIA include hardware acceleration for AES.  The C7
     series includes hardware acceleration for AES, SHA1, SHA256 and RSA.  All of the above
     processor series include a hardware random number generator.

     The padlock driver registers itself to accelerate AES operations and, if available,
     HMAC/SHA1 and HMAC/SHA256 for crypto(4).  It also registers itself to accelerate other HMAC
     algorithms, although there is no hardware acceleration for those algorithms.  This is only
     needed so padlock can work with ipsec(4).

     The hardware random number generator supplies data for the kernel random(4) subsystem.


     crypt(3), crypto(4), intro(4), ipsec(4), random(4), crypto(9)


     The padlock driver first appeared in OpenBSD.  The first FreeBSD release to include it was
     FreeBSD 6.0.


     The padlock driver with AES encryption support was written by Jason Wright
     <>.  It was ported to FreeBSD and then extended to support SHA1 and SHA256
     by Pawel Jakub Dawidek <>.  This manual page was written by Christian
     Brueffer <>.