export declare function sha256Hex(input: string | Buffer): string;
export declare function hmacSha256(key: Buffer | string, data: string): Buffer;
/** 按 RFC 3986 encode, 比 encodeURIComponent 更严格 */
export declare function rfc3986Encode(s: string): string;
/** Canonical query string: 字典序 sort + RFC 3986 encode */
export declare function canonicalizeQuery(params: Record<string, string | number | boolean | undefined>): string;
/** Canonical headers (lowercase + trim + sort) */
export declare function canonicalizeHeaders(headers: Record<string, string>): {
    canonical: string;
    signed: string;
};
export interface CanonicalRequestInput {
    method: string;
    uri: string;
    query: Record<string, string | number | boolean | undefined>;
    headers: Record<string, string>;
    payload: string;
}
export interface CanonicalRequest {
    request: string;
    signed_headers: string;
    payload_hash: string;
}
export declare function buildCanonicalRequest(input: CanonicalRequestInput): CanonicalRequest;
/** ISO 8601 时间, 阿里云/火山要的格式 (e.g. "20260501T120000Z") */
export declare function basicIso8601(date?: Date): string;
/** YYYYMMDD (用于 credential scope) */
export declare function dateYYYYMMDD(date?: Date): string;
//# sourceMappingURL=canonical.d.ts.map