This is a /dev/crypto device driver, equivalent to those in OpenBSD or FreeBSD. The main idea is to access existing ciphers in kernel space from userspace, thus enabling the re-use of a hardware implementation of a cipher.

For questions and suggestions, please use the homepage at https://github.com. Cryptodev-linux is hosted at https://github.com/cryptodev-linux/cryptodev-linux.

Older releases are also available at http://cryptodev-linux.org.

GnuTLS needs to be compiled with --enable-cryptodev in order to take advantage of /dev/crypto. GnuTLS 3.0.14 or later is recommended.

OpenSSL needs -DHAVE_CRYPTODEV and -DUSE_CRYPTODEV_DIGESTS flags during compilation. Note that the latter flag (digests) may induce a performance penalty in some systems.

The verbosity of the driver often needs to be adjusted for debugging. The sysctl tool can be used for that.

# sysctl ioctl.cryptodev_verbosity
ioctl.cryptodev_verbosity = 0

# sysctl ioctl.cryptodev_verbosity=3
ioctl.cryptodev_verbosity = 3