Function ocrypto_hmac_sha256_init 

pub unsafe extern "C" fn ocrypto_hmac_sha256_init(
    ctx: *mut ocrypto_hmac_sha256_ctx,
    key: *const u8,
    key_len: usize,
)

HMAC-SHA-256 initialization.

The generator state * ctx - is initialized by this function.

• ctx - Generator state.
• key - HMAC key.
• key_len - Length of * key - .