Static ring::digest::SHA512

pub static SHA512: Algorithm = Algorithm{output_len: SHA512_OUTPUT_LEN,
          chaining_len: SHA512_OUTPUT_LEN,
          block_len: SHA512_BLOCK_LEN,
          len_len: SHA512_LEN_LEN,
          block_data_order: GFp_sha512_block_data_order,
          format_output: sha512_format_output,
          initial_state:
              [7640891576956012808, 13503953896175478587, 4354685564936845355,
               11912009170470909681, 5840696475078001361,
               11170449401992604703, 2270897969802886507,
               6620516959819538809],
          id: AlgorithmID::SHA512,}

SHA-512 as specified in FIPS 180-4.