skein256(hash, outsize_b, message, 32*8);
cli_putstr_P(PSTR("\r\nhash:"));
cli_hexdump_block(hash, (outsize_b+7)/8, 4, 16);
cli_putstr_P(PSTR("\r\nmessage:"));
skein256(hash, outsize_b, message, 32*8);
cli_putstr_P(PSTR("\r\nhash:"));
cli_hexdump_block(hash, (outsize_b+7)/8, 4, 16);
cli_putstr_P(PSTR("\r\nmessage:"));