subtle.deriveBits(algorithm, baseKey[, length])

• algorithm:<AlgorithmIdentifier> | <EcdhKeyDeriveParams> | <HkdfParams> | <Pbkdf2Params>

• baseKey:<CryptoKey>

• length:<number> | <null> 默认值:null

  \length: <number> | <null> Default: null

• 返回:<Promise> 满足 <ArrayBuffer>

  \Returns: <Promise> Fulfills with an <ArrayBuffer>

使用 algorithm 中指定的方法和参数以及 baseKey 提供的密钥材料,subtle.deriveBits() 尝试生成 length 位。

\Using the method and parameters specified in algorithm and the keying material provided by baseKey, subtle.deriveBits() attempts to generate length bits.

当未提供 length 或 null 时,将生成给定算法的最大位数。这适用于 'ECDH'、'X25519' 和 'X448' 算法,对于其他算法,length 必须为数字。

\When length is not provided or null the maximum number of bits for a given algorithm is generated. This is allowed for the 'ECDH', 'X25519', and 'X448' algorithms, for other algorithms length is required to be a number.

如果成功,返回的 promise 将使用包含生成数据的 <ArrayBuffer> 进行解析。

\If successful, the returned promise will be resolved with an <ArrayBuffer> containing the generated data.

目前支持的算法包括:

\The algorithms currently supported include:

• 'ECDH'

• 'X25519'

• 'X448' ¹

• 'HKDF'

• 'PBKDF2'