import { PaymentDetails } from "./types";
/** Compute SHA-256 hash, return hex string */
export declare function sha256hex(data: string | Buffer): string;
/**
 * Convert the fetch BodyInit into the exact bytes the server will see, so the
 * client-signed `body_sha256` matches what the middleware hashes from the raw
 * request body. Supports the BodyInit types we can deterministically serialize
 * synchronously; anything else (Blob, FormData, URLSearchParams, ReadableStream)
 * is rejected so the caller gets a clear error instead of a silent hash
 * mismatch downstream at /v1/verify.
 */
export declare function bodyToBytes(body: unknown): Buffer;
/** Compute SHA-256 hash of canonical JSON payment details */
export declare function computePaymentDetailsHash(details: PaymentDetails): string;
/**
 * Compute requestHash per SUBLY402-SVM-V1 spec:
 * SHA-256("SUBLY402-SVM-V1-REQ\n" || METHOD || "\n" || ORIGIN || "\n" ||
 *         PATH_AND_QUERY || "\n" || BODY_SHA256_HEX || "\n" ||
 *         PAYMENT_DETAILS_HASH_HEX || "\n")
 */
export declare function computeRequestHash(method: string, origin: string, pathAndQuery: string, bodySha256: string, paymentDetailsHash: string): string;
/**
 * Build client signature message per spec:
 * "SUBLY402-SVM-V1-AUTH\n" followed by each field + "\n"
 */
export declare function buildSignatureMessage(fields: {
    version: number;
    scheme: string;
    paymentId: string;
    client: string;
    vault: string;
    providerId: string;
    payTo: string;
    network: string;
    assetMint: string;
    amount: string;
    requestHash: string;
    paymentDetailsHash: string;
    expiresAt: string;
    nonce: string;
}): Uint8Array;
/** Sign a message with Ed25519 */
export declare function ed25519Sign(message: Uint8Array, secretKey: Uint8Array): Uint8Array;
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