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SAFE(4)                  BSD Kernel Interfaces Manual                  SAFE(4)

NAME
     safe -- SafeNet crypto accelerator

SYNOPSIS
     device safe

     sysctl hw.safe.debug
     sysctl hw.safe.dump
     sysctl hw.safe.rnginterval
     sysctl hw.safe.rngbufsize
     sysctl hw.safe.rngmaxalarm

DESCRIPTION
     The safe driver supports cards containing SafeNet crypto accelerator
     chips.

     The safe driver registers itself to accelerate DES, Triple-DES, AES,
     MD5-HMAC, SHA1-HMAC, and NULL operations for ipsec(4) and crypto(4).

     On all models, the driver registers itself to provide random data to the
     random(4) subsystem.  Periodically the driver will poll the hardware RNG
     and retrieve data for use by the system.  If the driver detects that the
     hardware RNG is resonating with any local signal, it will reset the
     oscillators that generate random data.  Three sysctl(8) settings control
     this procedure: hw.safe.rnginterval specifies the time, in seconds,
     between polling operations, hw.safe.rngbufsize specifies the number of
     32-bit words to retrieve on each poll, and hw.safe.rngmaxalarm specifies
     the threshold for resetting the oscillators.

     When the driver is compiled with SAFE_DEBUG defined, two sysctl(8) vari-
     ables are provided for debugging purposes: hw.safe.debug can be set to a
     non-zero value to enable debugging messages to be sent to the console for
     each cryptographic operation, hw.safe.dump is a write-only variable that
     can be used to force driver state to be sent to the console.  Set this
     variable to ``ring'' to dump the current state of the descriptor ring, to
     ``dma'' to dump the hardware DMA registers, or to ``int'' to dump the
     hardware interrupt registers.

HARDWARE
     The safe driver supports cards containing any of the following chips:

           SafeNet 1141  The original chipset.  Supports DES, Triple-DES, AES,
                         MD5, and SHA-1 symmetric crypto operations, RNG, pub-
                         lic key operations, and full IPsec packet processing.

           SafeNet 1741  A faster version of the 1141.

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

BUGS
     Public key support is not implemented.

BSD                           September 12, 2004                           BSD