/**
 * Convert a 64-byte raw r || s signature to DER per RFC 3279 §2.2.3.
 * Output length is variable: 8 bytes minimum (r = s = 1 byte each, no
 * sign-pad), 72 bytes maximum (both components 32 bytes with high bit
 * set, each picking up a 0x00 sign-pad).
 *
 * @throws TypeError if `sig` is not a Uint8Array
 * @throws RangeError if `sig.length !== 64`
 */
export declare function ecdsaSignatureToDer(sig: Uint8Array): Uint8Array;
/**
 * Convert a DER ECDSA-P256 signature to 64-byte raw r || s. Rejects
 * any DER syntax violation via SigningError('sig-malformed-input'):
 * see the file-level header for the rejection rules.
 *
 * Semantic value rejections (r = 0, s = 0, high-s, off-range) are
 * deferred to the WASM verify path; this function only enforces DER
 * structure.
 *
 * @throws TypeError if `der` is not a Uint8Array
 * @throws SigningError('sig-malformed-input') on any DER syntax error
 */
export declare function ecdsaSignatureFromDer(der: Uint8Array): Uint8Array;