export declare function hashSha256(data: Uint8Array): Uint8Array;
export declare function hashMessage(data: string): string;
export declare function hashPlaintext(plaintext: string, clientTimestamp: number, guardAddress?: string, passportAddress?: string, lastReceivedLeafIndex?: number): string;
export declare function generateNonce(): string;
export declare function bytesToBase64(bytes: Uint8Array): string;
export declare function base64ToBytes(base64: string): Uint8Array;
export declare function bytesToHex(bytes: Uint8Array): string;
export declare function hexToBytes(hex: string): Uint8Array;
export declare function arrayBufferToUint8Array(buf: ArrayBuffer): Uint8Array;
export declare function uint8ArrayToArrayBuffer(arr: Uint8Array): ArrayBuffer;
export declare function bufferEqual(a: ArrayBufferLike, b: ArrayBufferLike): boolean;
export declare function calculateMerkleLeafHash(plaintextHash: string, serverTimestamp: number): string;
export declare function merkleHash(left: string, right: string): string;
export declare function computeNewRoot(prevRoot: string, leafHash: string, leafIndex: number): string;
export declare function verifyMerkleProof(leafHash: string, proof: {
    root: string;
    siblings: string[];
    indices: number[];
}): boolean;
export interface MerkleChainValidationResult {
    valid: boolean;
    error?: string;
    expectedRoot?: string;
    actualRoot?: string;
}
export declare function verifyMerkleChain(messages: Array<{
    leafIndex: number;
    prevRoot: string;
    newRoot: string;
    plaintextHash: string;
    serverTimestamp: number;
}>, initialRoot?: string): MerkleChainValidationResult;
export declare function verifySingleMerkleRoot(prevRoot: string, newRoot: string, plaintextHash: string, serverTimestamp: number, leafIndex: number): MerkleChainValidationResult;
export interface MessageVerificationResult {
    valid: boolean;
    error?: string;
    failedCheck?: "merkle" | "plaintext";
}
export interface MessageVerificationParams {
    messageId: string;
    plaintext: string;
    plaintextHash: string;
    createdAt: number;
    guardAddress?: string;
    passportAddress?: string;
    lastReceivedLeafIndex?: number;
    serverSignature?: string;
    serverPublicKey?: string;
    merkleMetadata?: {
        prevRoot?: string;
        newRoot: string;
        timestamp?: number;
        serverTimestamp?: number;
        leafIndex: number;
        proofSiblings?: string[];
        proofIndices?: number[];
    };
}
export declare function verifyMessage(params: MessageVerificationParams): MessageVerificationResult;
export declare function verifyFalcon512Signature(publicKeyHex: string, message: string, signatureHex: string): boolean;
export interface WtsMessageVerificationParams {
    id: string;
    from: string;
    to: string;
    plaintextHash: string;
    clientTimestamp: number;
    timestamp: number;
    leafIndex: number;
    merkleRoot: string;
    prevRoot?: string;
    serverSignature?: string;
    serverPublicKey?: string;
    guardAddress?: string;
    passportAddress?: string;
    lastReceivedLeafIndex?: number;
    plaintext?: string;
    merkleProof?: {
        siblings: string[];
        indices: number[];
    };
}
export interface WtsVerificationResult {
    valid: boolean;
    error?: string;
    failedMessageIndex?: number;
    failedCheck?: "plaintext" | "merkle" | "chain";
}
export declare function verifyWtsMessages(messages: WtsMessageVerificationParams[]): WtsVerificationResult;