Function: getSharedSecret()

getSharedSecret(privateKey, fullPublicKey): string

Defined in: src/utils/stark/index.ts:234

Calculate the shared secret using ECDH key agreement protocol with a given private key and a full public key.

Parameters

privateKey

BigNumberish

a Starknet 252 bits private key.

fullPublicKey

BigNumberish

a 520 bit number, representing the full public key related to privateKey, which can be obtained by getFullPublicKey function. This number needs to start with '0x04' to indicate that it's a full public key, and the remaining 128 bytes represent the x and y coordinates of the public key point on the elliptic curve (64 bytes for x and 64 bytes for y).

Returns

string

an hex string of a 256 bit number, representing the shared secret calculated by ECDH key agreement protocol using privateKey and fullPublicKey.

Example

const myPrivateKey = "0x67d0bd238e266b6defbb1ad4de4cf1dde2dc55b3518596e0bae29e439165596";
const bobFullPublicKey = "0x0402d6b3ff569186d67a2ff0b8548328798d3500c16191f6c021f929134d48a15405f9fc5a11467b96a59b8fce3c0c919c337f11337c815bb9d0dc42bac7ac42a9";
const result = stark.getSharedSecret(myPrivateKey, bobFullPublicKey);
// result = "0x020619d1a277a5bc51aac6ab0c22d97e414d4bee9711a2d0aa421997f5efd68bab"