Options for Initialization Vectors using fixed+random+counter structure.
IVs following this construction method have three parts:
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.
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