/**
 * Parse an ECDSA P-256 private key from DER bytes (SEC1 or PKCS#8) and
 * return the private scalar `d` as a bigint.
 *
 * @throws {ToolError} with code `EC_KEY_PARSE_FAILED` for any decode error.
 * @throws {ToolError} with code `EC_CURVE_UNSUPPORTED` when the embedded
 *         curve is not P-256.
 */
export declare function parseEcPrivateKeyDer(der: Uint8Array): bigint;
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