• Key Generator
• Mozilla Firefox Setup
• Enable Key Generation Mozilla Firefox Download

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Secure context
This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Use the generateKey() method of the SubtleCrypto interface to generate a new key (for symmetric algorithms) or key pair (for public-key algorithms).

Syntax

Parameters

• algorithm is a dictionary object defining the type of key to generate and providing extra algorithm-specific parameters.
  • For RSASSA-PKCS1-v1_5, RSA-PSS, or RSA-OAEP: pass an RsaHashedKeyGenParams object.
  • For ECDSA or ECDH: pass an EcKeyGenParams object.
  • For HMAC: pass an HmacKeyGenParams object.
  • For AES-CTR, AES-CBC, AES-GCM, or AES-KW: pass an AesKeyGenParams object.
• extractable is a Boolean indicating whether it will be possible to export the key using SubtleCrypto.exportKey() or SubtleCrypto.wrapKey().
• keyUsages Â is an Array indicating what can be done with the newly generated key. Possible values for array elements are:
  • encrypt: The key may be used to encrypt messages.
  • decrypt: The key may be used to decrypt messages.
  • sign: The key may be used to sign messages.
  • verify: The key may be used to verify signatures.
  • deriveKey: The key may be used in deriving a new key.
  • deriveBits: The key may be used in deriving bits.
  • wrapKey: The key may be used to wrap a key.
  • unwrapKey: The key may be used to unwrap a key.

Key Generator

Return value

• result is a Promise that fulfills with a CryptoKey (for symmetric algorithms) or a CryptoKeyPair (for public-key algorithms).

Exceptions

The promise is rejected when the following exception is encountered:

SyntaxError

Raised when the result is a CryptoKey of type secret or private but keyUsages is empty.

SyntaxError

Raised when the result is a CryptoKeyPair and its privateKey.usages attribute is empty.

Examples

RSA key pair generation

This code generates an RSA-OAEP encryption key pair. See the complete code on GitHub.

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Elliptic curve key pair generation

This code generates an ECDSA signing key pair. See the complete code on GitHub.

HMAC key generation

This code generates an HMAC signing key. See the complete code on GitHub.

AES key generation

This code generates an AES-GCM encryption key. See the complete code on GitHub.

Specifications

Browser compatibility

See also

• Cryptographic key length recommendations.
• NIST cryptographic algorithm and key length recommendations.

The Crypto.getRandomValues() method lets you get cryptographically strong random values. The array given as the parameter is filled with random numbers (random in its cryptographic meaning).

To guarantee enough performance, implementations are not using a truly random number generator, but they are using a pseudo-random number generator seeded with a value with enough entropy. The PRNG used differs from one implementation to the other but is suitable for cryptographic usages. Implementations are also required to use a seed with enough entropy, like a system-level entropy source.

getRandomValues() is the only member of the Crypto interface which can be used from an insecure context.

Syntax

Parameters

typedArray

An integer-based TypedArray, that is an Int8Array, a Uint8Array, an Int16Array, a Uint16Array, an Int32Array, or a Uint32Array. All elements in the array are overwritten with random numbers.

Return value

The same array passed as typedArrayÂ but with its contents replaced with the newly generated random numbers. Note that typedArray is modified in-place, and no copy is made.

Exceptions

This method can throw an exception under error conditions.

QuotaExceededError

The requested length exceeds 65,536 bytes.

Usage notes

Don't use getRandomValues() to generate encryption keys. Instead, use the generateKey() method. There are a few reasons for this; for example, getRandomValues() is not guaranteed to be running in a secure context.

There is no minimum degree of entropy mandated by the Web Cryptography specification. User agents are instead urged to provide the best entropy they can when generating random numbers, using a well-defined, efficient pseudorandom number generator built into the user agent itself, but seeded with values taken from an external source of pseudorandom numbers, such as a platform-specific random number function, the Unix /dev/urandom device, or other source of random or pseudorandom data.

Examples

Specification

Browser compatibility

Mozilla Firefox Setup

See also

Enable Key Generation Mozilla Firefox Download

• Window.crypto to get a Crypto object.
• Math.random, a non-cryptographic source of random numbers.