Function av_hmac_final

pub unsafe extern "C" fn av_hmac_final(
    ctx: *mut AVHMAC,
    out: *mut u8,
    outlen: u32,
) -> i32

Finish hashing and output the HMAC digest. @param ctx The HMAC context @param out The output buffer to write the digest into @param outlen The length of the out buffer, in bytes @return The number of bytes written to out, or a negative error code.