Web/API/Crypto

The Crypto interface represents basic cryptography features available in the current context. It allows access to a cryptographically strong random number generator and to cryptographic primitives.

Note: This feature is available in Web Workers.

The Web Crypto API is accessed through the Window.crypto property, which is a Crypto object.

Properties

This interface implements properties defined on RandomSource.

Crypto.subtle Read only Secure context: Returns a SubtleCrypto object providing access to common cryptographic primitives, like hashing, signing, encryption, or decryption.

Methods

This interface implements methods defined on RandomSource.

Crypto.getRandomValues(): Fills the passed TypedArray with cryptographically sound random values.

Usage notes

You should avoid using the Web Crypto API on insecure contexts, even though the Crypto interface is present on insecure contexts, as is the Window.crypto property. In addition, the Crypto method getRandomValues() is available on insecure contexts, but the subtle property is not.

In general, you probably should just treat Crypto as available only on secure contexts.

Specifications

Specification	Status	Comment
Web Cryptography APIThe definition of 'Crypto' in that specification.	Recommendation	Initial definition

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`Crypto`	Chrome Full support 11	Edge Full support 12	Firefox Full support 26	IE Full support 11	Opera Full support 15	Safari Full support 6.1	WebView Android Full support Yes	Chrome Android Full support 18	Firefox Android Full support 26	Opera Android Full support 14	Safari iOS Full support 6.1	Samsung Internet Android Full support 1.0
`getRandomValues()`	Chrome Full support 11	Edge Full support 12	Firefox Full support 26	IE Full support 11	Opera Full support 15	Safari Full support 6.1	WebView Android Full support ≤37	Chrome Android Full support 18	Firefox Android Full support 26	Opera Android Full support 14	Safari iOS Full support 6.1	Samsung Internet Android Full support 1.0
`subtle` Experimental'	Chrome Full support 37	Edge Full support 12	Firefox Full support 34 Full support 34 No support 32 — 34 Disabled' Disabled' From version 32 until version 34 (exclusive): this feature is behind the `dom.webcrypto.enabled` preference (needs to be set to `true`). To change preferences in Firefox, visit about:config.	IE Partial support 11	Opera Full support 24	Safari Full support 10.1 Full support 10.1 Full support 7 Prefixed' Prefixed' Implemented with the vendor prefix: webkit	WebView Android Full support 37	Chrome Android Full support 37	Firefox Android Full support 34 Full support 34 No support 32 — 34 Disabled' Disabled' From version 32 until version 34 (exclusive): this feature is behind the `dom.webcrypto.enabled` preference (needs to be set to `true`). To change preferences in Firefox, visit about:config.	Opera Android Full support 24	Safari iOS Full support 10.3 Full support 10.3 Full support 7 Prefixed' Prefixed' Implemented with the vendor prefix: webkit	Samsung Internet Android Full support 3.0

Legend

Full support: Full support
Partial support: Partial support
Experimental. Expect behavior to change in the future.': Experimental. Expect behavior to change in the future.
User must explicitly enable this feature.': User must explicitly enable this feature.
Requires a vendor prefix or different name for use.': Requires a vendor prefix or different name for use.