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CRYPTO(4) Device Drivers Manual CRYPTO(4)

crypto
hardware crypto access driver

pseudo-device crypto [
count
]

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:
 
 
Set up a new crypto session for a new type of operation.
 
 
Free a previously established session.
 
 
Perform a crypto operation against a previously set up session.

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
 

/dev/crypto
crypto access device

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

The crypto driver appeared in OpenBSD 3.0.
March 24, 2012 OpenBSD-5.4