---
name: "ossl"
section: "4"
platform: "freebsd"
package: "base"
version: "16.0-CURRENT-20261027-61c70dc16a79"
release: "FreeBSD 16.0-CURRENT (2026-10-27)"
platforms: ["freebsd"]
url: "https://new.carta.tech/ossl"
---

# ossl(4)

driver using OpenSSL assembly routines

## NAME

**ossl** – driver using OpenSSL assembly routines

## SYNOPSIS

**device** **crypto** **device** **cryptodev** **device** **ossl**

In [loader.conf(5)](/loader.conf/5.md): **ossl\_load="YES"**

## DESCRIPTION

The OpenSSL distribution includes architecture-specific implementations for some commonly used cryptographic algorithms. This driver adds a wrapper around these routines permitting them to be used by in-kernel cryptography consumers such as kernel TLS and IPsec.

The **ossl** driver includes support for the following algorithms:

- AES-CBC

- AES-GCM (amd64 only)

- ChaCha20

- ChaCha20-Poly1305 (RFC 8439)

- Poly1305

- SHA1

- SHA1-HMAC

- SHA2-224

- SHA2-224-HMAC

- SHA2-256

- SHA2-256-HMAC

- SHA2-384

- SHA2-384-HMAC

- SHA2-512

- SHA2-512-HMAC

## HARDWARE

The **ossl** driver supports cryptographic acceleration via OpenSSL on the following architectures:

- amd64

- arm64

- i386

- powerpc64

## SEE ALSO

[crypto(4)](/crypto/4.md), [intro(4)](/intro/4.md), [ipsec(4)](/ipsec/4.md), [crypto(7)](/crypto/7.md), [crypto(9)](/crypto/9.md)

## HISTORY

The **ossl** driver first appeared in FreeBSD 13.0.