open-vault/website/source/docs/enterprise/hsm/index.html.md
2018-05-13 16:39:22 -04:00

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---
layout: "docs"
page_title: "HSM Integration - Vault Enterprise"
sidebar_current: "docs-vault-enterprise-hsm"
description: |-
Vault Enterprise has HSM support, allowing for external master key storage and automatic unsealing.
---
# Vault Enterprise HSM Support
HSM support is a feature of [Vault
Enterprise](https://www.hashicorp.com/vault.html) that takes advantage of HSMs
to provide three pieces of special functionality:
* Master Key Wrapping: Vault protects its master key by transiting it through
the HSM for encryption rather than splitting into key shares
* Automatic Unsealing: Vault stores its HSM-wrapped master key in storage,
allowing for automatic unsealing
* [Seal Wrapping](/docs/enterprise/sealwrap/index.html) to provide FIPS
KeyStorage-conforming functionality for Critical Security Parameters
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.html) page for
important information on these differences.
The [Configuration](/docs/configuration/seal/pkcs11.html) page contains
configuration information.
Finally, the [Security](/docs/enterprise/hsm/security.html) page contains
information about deploying Vault's HSM support in a secure fashion.