import { Sig, PubKey, ByteString } from '../types/index.js';
import { AbstractContract } from '../abstractContract.js';
/**
 * Verifies a signature against an explicit message and public key.
 * Unlike checkSig which uses the transaction preimage as the implicit message,
 * checkDataSig allows verifying signatures on arbitrary data.
 *
 * @ignore
 * @param self - The contract instance (unused, kept for consistency with other check methods)
 * @param signature - The signature to verify in hex format (pure DER encoded, NO sighash type)
 * @param message - The message that was signed (will be SHA256 hashed once)
 * @param publickey - The public key in hex format to verify the signature against
 * @returns true if the signature is valid for the given message and public key,
 *          false if invalid or if encoding checks fail
 *
 * @remarks
 * - Uses SHA256 single hash on the message (not hash256 double hash)
 * - Stack order for OP_CHECKSIGFROMSTACK: <sig> <msg> <pubKey> (bottom to top)
 * - Unlike OP_CHECKSIG, OP_CHECKSIGFROMSTACK does NOT require sighash type appended to signature
 */
export declare function checkDataSigImpl(self: AbstractContract, signature: Sig, message: ByteString, publickey: PubKey): boolean;
//# sourceMappingURL=checkDataSig.d.ts.map