CRYPTO(4)

NAME
crypto - hardware crypto access driver

SYNOPSIS
pseudo-device crypto [count]

DESCRIPTION
The crypto driver provides userland applications access to hardware crypto support via the kernel. The /dev/crypto device node primarily operates 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 session.

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

CRYPTO_DES_CBC
CRYPTO_3DES_CBC
CRYPTO_BLF_CBC
CRYPTO_CAST_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), nofn(4), safe(4), ubsec(4), crypto(9)

HISTORY
The crypto driver appeared in OpenBSD 3.0.