HmacImportParams

HmacImportParams: object

The HmacImportParams dictionary of the Web Crypto API represents the object that should be passed as the algorithm parameter into SubtleCrypto.importKey or SubtleCrypto.unwrapKey, when generating a key for the HMAC algorithm.

Type declaration

hash

hash: string | { name: string; }

A string or an object containing a single property called name with a string value. It is an identifier for the digest algorithm to use. This should be one of the following:

• SHA-256: selects the SHA-256 algorithm.
• SHA-384: selects the SHA-384 algorithm.
• SHA-512: selects the SHA-512 algorithm.

length?

optional length: number

A Number representing the length in bits of the key. If this is omitted the length of the key is equal to the length of the digest generated by the digest function you have chosen. Unless you have a good reason to use a different length, omit this property and use the default.

name

name: string

A string. This should be set to HMAC.

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Last updated: Oct 02, 2025