import { Hex } from 'viem';
/**
 * Compute the SHA-256 hashlock from a secret preimage.
 *
 * Matches the on-chain validation: `sha256(abi.encodePacked(s))` where `s` is a `bytes32`.
 * `abi.encodePacked(bytes32)` is just the raw 32 bytes — no ABI padding.
 *
 * @param secret - 0x-prefixed bytes32 secret (66 hex chars)
 * @returns 0x-prefixed bytes32 SHA-256 hash
 * @throws if secret is not exactly 32 bytes
 */
export declare function computeHashlock(secret: Hex): Hex;
/**
 * Validate that a secret's SHA-256 hash matches the expected hashlock.
 *
 * Use this for client-side pre-validation before sending the activation
 * transaction to avoid wasting gas on a contract revert.
 *
 * @param secret - 0x-prefixed bytes32 secret (66 hex chars)
 * @param hashlock - 0x-prefixed bytes32 expected hashlock from the vault
 * @returns true if SHA-256(secret) matches the hashlock
 * @throws if secret or hashlock is not exactly 32 bytes
 */
export declare function validateSecretAgainstHashlock(secret: Hex, hashlock: Hex): boolean;
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