Source/WebCore/crypto/parameters/HmacKeyParams.idl

/*
 * Copyright (C) 2016 Apple Inc. All rights reserved.
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typedef (object or DOMString) HashAlgorithmIdentifier;

// This is a unified dictionary for HmacImportParams and HmacKeyGenParams.
// https://www.w3.org/TR/WebCryptoAPI/#hmac-importparams, and
// https://www.w3.org/TR/WebCryptoAPI/#hmac-keygen-params
[
    Conditional=WEB_CRYPTO,
    ImplementedAs=CryptoAlgorithmHmacKeyParams
] dictionary HmacKeyParams : CryptoAlgorithmParameters {
    // The inner hash function to use.
    required HashAlgorithmIdentifier hash;
    // The length (in bits) of the key to generate. If unspecified, the
    // recommended length will be used, which is the size of the associated hash function's block
    // size.
    [EnforceRange] unsigned long length;
};