/** A single share from Shamir's Secret Sharing. */
export interface ShamirShare {
    /** Share index (1–255). Each share must have a unique index. */
    index: number;
    /** Share data — same length as the original secret. */
    data: Buffer;
}
/**
 * Split a secret into `totalShares` shares, requiring `threshold` to reconstruct.
 *
 * @param secret      The secret to split (arbitrary-length Buffer).
 * @param threshold   Minimum shares needed for reconstruction (2 ≤ t ≤ n).
 * @param totalShares Number of shares to produce (t ≤ n ≤ 255).
 * @returns Array of shares, each with a unique index and data.
 */
export declare function split(secret: Buffer, threshold: number, totalShares: number): ShamirShare[];
/**
 * Reconstruct a secret from shares using Lagrange interpolation at x = 0.
 *
 * @param shares  At least `threshold` shares with unique indices.
 * @returns The reconstructed secret.
 */
export declare function combine(shares: ShamirShare[]): Buffer;
/**
 * Encode a share as a human-readable string.
 * Format: `aegis_share_<index_hex>_<data_hex>`
 */
export declare function encodeShare(share: ShamirShare): string;
/**
 * Decode a share from its string representation.
 */
export declare function decodeShare(encoded: string): ShamirShare;
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