did-jwt/lib.esm/encryption/ECDH.js

Library for Signing and Verifying JWTs that use DIDs as issuers and JWEs that use DIDs as recipients

import { x25519 } from '@noble/curves/ed25519.js';
/**
 * Wraps an X25519 secret key into an ECDH method that can be used to compute a shared secret with a public key.
 * @param mySecretKey A `Uint8Array` of length 32 representing the bytes of my secret key
 * @returns an `ECDH` method with the signature `(theirPublicKey: Uint8Array) => Promise<Uint8Array>`
 *
 * @throws 'invalid_argument:...' if the secret key size is wrong
 */
export function createX25519ECDH(mySecretKey) {
    if (mySecretKey.length !== 32) {
        throw new Error('invalid_argument: incorrect secret key length for X25519');
    }
    return async (theirPublicKey) => {
        if (theirPublicKey.length !== 32) {
            throw new Error('invalid_argument: incorrect publicKey key length for X25519');
        }
        return x25519.getSharedSecret(mySecretKey, theirPublicKey);
    };
}
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