CRYPTO(4)                 OpenBSD Programmer's Manual                CRYPTO(4)

NAME
     crypto - hardware crypto access driver

SYNOPSIS
     pseudo-device crypto [count]

DESCRIPTION
     The crypto driver provides userland applications access to hardware cryp-
     to support via the kernel.  The /dev/crypto device node primarily oper-
     ates in an ioctl(2) based model, permitting a variety of applications to
     query device capabilities, submit transactions, and get results.

     If count is given in the specification, and is greater than 0, a maximum
     of one crypto device is created.

     The following ioctl(2) calls apply only to the crypto devices:

     CIOCGSESSION  Set up a new crypto session for a new type of operation.

     CIOCFSESSION  Free a previously established session.

     CIOCCRYPT     Perform a crypto operation against a previously set up ses-
                   sion.

FEATURES
     Depending on hardware being present, the following symmetric and asymmet-
     ric cryptographic features are potentially available from /dev/crypto:

           CRYPTO_DES_CBC
           CRYPTO_3DES_CBC
           CRYPTO_BLF_CBC
           CRYPTO_CAST_CBC
           CRYPTO_SKIPJACK_CBC
           CRYPTO_MD5_HMAC
           CRYPTO_SHA1_HMAC
           CRYPTO_RIPEMD160_HMAC
           CRYPTO_MD5_KPDK
           CRYPTO_SHA1_KPDK
           CRYPTO_AES_CBC
           CRYPTO_AES_CTR
           CRYPTO_AES_XTS
           CRYPTO_ARC4
           CRYPTO_MD5
           CRYPTO_SHA1
           CRK_MOD_EXP
           CRK_MOD_EXP_CRT
           CRK_DSA_SIGN
           CRK_DSA_VERIFY
           CRK_DH_COMPUTE_KEY

FILES
     /dev/crypto  crypto access device

SEE ALSO
     hifn(4), lofn(4), noct(4), nofn(4), safe(4), ubsec(4), crypto(9)

HISTORY
     The crypto driver appeared in OpenBSD 3.0.

OpenBSD 4.7                      June 9, 2008                                1
