/**
 * Derives a shared secret using ECDH over secp256k1.
 * @param privateKeyA Local private key (32 bytes).
 * @param publicKeyB Remote public key (compressed or uncompressed SEC1 format).
 * @returns 32-byte x coordinate of the shared point.
 */
export declare function derive(privateKeyA: Uint8Array, publicKeyB: Uint8Array): Uint8Array;
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