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---
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layout: "docs"
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page_title: "HSM Integration - Vault Enterprise"
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sidebar_current: "docs-vault-enterprise-hsm"
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description: |-
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Vault Enterprise has HSM support, allowing for external master key storage and automatic unsealing.
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---
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# Vault Enterprise HSM Support
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HSM support is a feature of [Vault
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Enterprise](https://www.hashicorp.com/vault.html) that takes advantage of HSMs
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to provide three pieces of special functionality:
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* Master Key Wrapping: Vault protects its master key by transiting it through
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the HSM for encryption rather than splitting into key shares
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* Automatic Unsealing: Vault stores its HSM-wrapped master key in storage,
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allowing for automatic unsealing
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* [Seal Wrapping](/docs/enterprise/sealwrap/index.html) to provide FIPS
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KeyStorage-conforming functionality for Critical Security Parameters
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HSM support is available for devices that support PKCS#11 version 2.20+
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interfaces and provide integration libraries, and is currently available for
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linux/amd64 platforms only. It has successfully been tested against many
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different vendor HSMs; HSMs that provide only subsets of the full PKCS#11
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specification can usually be supported but it depends on available
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cryptographic mechanisms.
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Please note however that configuration details, flags, and supported features
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within PKCS#11 vary depending on HSM model and configuration. Consult your
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HSM's documentation for more details.
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Some parts of Vault work differently when using an HSM. Please see the
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[Behavioral Changes](/docs/enterprise/hsm/behavior.html) page for
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important information on these differences.
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The [Configuration](/docs/configuration/seal/pkcs11.html) page contains
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configuration information.
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Finally, the [Security](/docs/enterprise/hsm/security.html) page contains
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information about deploying Vault's HSM support in a secure fashion.
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