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Showing content from http://cryptodev-linux.org/ below:

Cryptodev-linux module

Welcome to Cryptodev-linux project pages

• Overview

  Cryptodev-linux is a device that allows access to Linux kernel cryptographic drivers; thus allowing of userspace applications to take advantage of hardware accelerators. Cryptodev-linux is implemented as a standalone module that requires no dependencies other than a stock linux kernel. Its API is compatible with OpenBSD's cryptodev userspace API (/dev/crypto).

• Features
  • Self contained linux kernel module
  • Exact simulation of the /dev/crypto interface
  • Support for all major cipher and hash algorithms
  • Zero copy of data
  • Support for additional features to optimize TLS and SRTP protocols
  • Support for AEAD ciphers
  • Asynchronous and synchronous interfaces
• Why use /dev/crypto

  Several small systems include a hardware crypto device that optimizes cryptographic operations with a 100x factor or even more comparing to a plain software implementation. Those systems usually provide kernel space drivers for those accelerators but they are not accessible from typical usespace programs and libraries such as GnuTLS or OpenSSL. The /dev/crypto device is a middleware allowing access to the hardware cryptographic modules from user-space applications and thus providing cryptographic operations acceleration.

• Why use cryptodev-linux
  • It provides better performance than any of the alternatives including AF_ALG;
  • It has an API-compatible interface with FreeBSD and OpenBSD cryptodev;
  • It uses the native Linux kernel crypto drivers.
• Alternatives
  • NCR a Cryptographic Framework for Linux originally based on this one. Instead of simply providing cryptographic operations, it acts as a software security module.
  • OCF-linux is a port of the OpenBSD Cryptographic Framework to Linux that also includes the /dev/crypto interface. This unlike cryptodev-linux does not use the native Linux crypto interfaces.
  • Linux 2.6.38 AF_ALG. Linux 2.6.38 introduced a sockets-based protocol to perform cryptographic operations. It is very inefficient in modern hardware; we made a performance comparison with cryptodev-linux.

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