Crypto algorithm block size in octets. If plaintext and ciphertext have different lengths, the longer length is considered.
Number of counter bits.
Fixed portion. Required if fixedBits is positive. This may be specified as a bigint or a Uint8Array. If it's a Uint8Array, it must have fixedBits bits. The least significant bits are taken.
Number of fixed bits.
IV length in octets.
If true, all IVs must have the same bits in the random portion.
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Options for Initialization Vectors using fixed+random+counter structure.
IVs following this construction method have three parts:
fixed bits, specified in options.
random bits, different for each key and in each session.
counter bits, monotonically increasing for each plaintext/ciphertext block.