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.

The Web Crypto API is accessed through the global 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 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

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
Crypto	11	12	26	11	15	5	≤37	18	26	14	5	1.0
getRandomValues	11	12	26	11	15	5	≤37	18	26	14	5	1.0
randomUUID	92	92	No	No	78	No	92	92	No	No	No	16.0
subtle	37	12	34	11	24	11 7-11.1	37	37	34	24	11 7-11.3	3.0

See also

• Web security
• Secure contexts
• Features restricted to secure contexts
• Transport Layer Security
• Strict-Transport-Security