import { type Address } from 'viem';
/**
 * Parse a DER-encoded ECDSA signature into r and s components.
 *
 * DER format: 0x30 <total-len> 0x02 <r-len> <r-bytes> 0x02 <s-len> <s-bytes>
 */
export declare function parseDerSignature(der: Uint8Array): {
    r: Uint8Array;
    s: Uint8Array;
};
/**
 * Parse a DER-encoded SPKI public key to extract the uncompressed secp256k1 point (65 bytes).
 *
 * SPKI structure for secp256k1:
 *   SEQUENCE {
 *     SEQUENCE { OID ecPublicKey, OID secp256k1 }
 *     BIT STRING { 0x00 (unused bits) 0x04 <x 32 bytes> <y 32 bytes> }
 *   }
 */
export declare function parseDerPublicKey(der: Uint8Array): Uint8Array;
/**
 * Apply EIP-2 low-s normalization.
 * If s > secp256k1n/2, replace s with secp256k1n - s.
 */
export declare function normalizeSignature(r: Uint8Array, s: Uint8Array): {
    r: Uint8Array;
    s: Uint8Array;
};
/**
 * Resolve the recovery parameter (yParity) by trying 0 and 1,
 * then comparing the recovered address against the expected address.
 * Uses viem's recoverAddress internally.
 */
export declare function resolveRecoveryParam(digest: Uint8Array, r: Uint8Array, s: Uint8Array, address: Address): Promise<number>;
/**
 * Derive Ethereum address from an uncompressed secp256k1 public key (65 bytes).
 * address = keccak256(pubkey[1:])[12:]
 */
export declare function publicToAddress(pubkey: Uint8Array): Address;
/** Convert a Uint8Array to a BigInt */
export declare function bytesToBigInt(bytes: Uint8Array): bigint;
/** Convert a BigInt to a 32-byte Uint8Array */
export declare function bigIntTo32Bytes(value: bigint): Uint8Array;