---
layout: docs
page_title: HSM Integration - Vault Enterprise
description: >-
  Vault Enterprise has HSM support, allowing for external root key storage and
  automatic unsealing.
---

# Vault Enterprise HSM Support

-> **Note**: This feature requires [Vault Enterprise Plus](https://www.hashicorp.com/products/vault/).

- Root key Wrapping: Vault protects its root key by transiting it through
  the HSM for encryption rather than splitting into key shares
- Automatic Unsealing: Vault stores its HSM-wrapped root key in storage,
  allowing for automatic unsealing
- [Seal Wrapping](/docs/enterprise/sealwrap) to provide FIPS
  KeyStorage-conforming functionality for Critical Security Parameters
- [Entropy Augmentation](/docs/enterprise/entropy-augmentation) to
  allow Vault to sample entropy from an external cryptographic module.

HSM support is available for devices that support PKCS#11 version 2.20+
interfaces and provide integration libraries, and is currently available for
linux/amd64 platforms only. It has successfully been tested against many
different vendor HSMs; HSMs that provide only subsets of the full PKCS#11
specification can usually be supported but it depends on available
cryptographic mechanisms.

Please note however that configuration details, flags, and supported features
within PKCS#11 vary depending on HSM model and configuration. Consult your
HSM's documentation for more details.

Some parts of Vault work differently when using an HSM. Please see the
[Behavioral Changes](/docs/enterprise/hsm/behavior) page for
important information on these differences.

The [Configuration](/docs/configuration/seal/pkcs11) page contains
configuration information.

Finally, the [Security](/docs/enterprise/hsm/security) page contains
information about deploying Vault's HSM support in a secure fashion.
