In Sway, the b512
type is commonly used to handle public keys and signatures. This guide will explain how the b512
type is defined in Sway, how to visualize a b512
value using the SDK, and how to interact with a contract function that accepts a b512
parameter.
The b512
type in Sway is a wrapper around two b256
types, allowing for the representation of 64-byte values. It is defined as a struct:
pub struct B512 {
bytes: [b256; 2],
}
b512
in the SDK In the SDK, you can visualize a b512
value by examining a wallet's public key:
// #import { Wallet };
const wallet = Wallet.generate({
provider,
});
console.log(walllet.publicKey);
// 0x97e3a666e4cd34b6b3cf778ef5ec617de4439b68f7a629245442a1fece7713094a1cb0aa7ad0ac253ca1ea47d4618f9090b2a881e829e091fb2c426763e94cca
b512
Value in a Contract Function Let's consider a contract function that accepts a b512
parameter and returns the same value:
fn echo_b512(input: B512) -> B512 {
input
}
To call this function and validate the returned value, follow these steps:
const b512 = wallet.publicKey;
const { value } = await contract.functions.echo_b512(b512).simulate();
expect(value).toEqual(b512);
In this example, we generate a wallet, use its public key as the b512
input, call the echo_b512
contract function, and expect the returned value to match the original input.