import { Buffer } from 'buffer';
/**
 * Converts to utf-8 encoding and removes null characters.
 *
 * @param buf - the buffer, byte array, or string to convert to utf-8 encoding
 *
 * @returns utf-8 encoded string
 */
export declare const buf2String: (buf: Uint8Array | Buffer | number[]) => string;
/**
 * Converts to utf-8 encoding and removes null characters.
 *
 * @param buf - the buffer, byte array, or string to convert to utf-8 encoding
 *
 * @returns utf-8 encoded string
 */
export declare const toUtf8: (buf: Uint8Array | Buffer | number[]) => string;
/**
 * Determine whether a given string contains only base58 characters
 * @param value - the string to verify
 * @returns boolean indicating if a value is base58 encoded
 */
export declare const isBase58: (value: string) => boolean;
/**
 * Determine whether a given string contains a secretKey Uint8Array
 * @param value - the string to verify
 * @param length - the minimum number of bytes enclosed in square brackets
 * @returns boolean indicating if a value contains a secretKey in byte array format
 */
export declare const isBytes: (value: string, length?: number) => boolean;
/**
 * Determine whether a given string contains a secretKey Uint8Array
 * @param value - the string to verify
 * @param length - the minimum number of bytes enclosed in square brackets
 * @returns boolean indicating if a value contains a secretKey in byte array format
 */
export declare const isKeypairString: (value: string, length?: number) => boolean;
/**
 * Determine whether a given string is hex encoded
 * @param value - the string to verify
 * @param length - the minimum number of characters following the 0x prefix
 * @returns boolean indicating if a value is a hex encoded string
 */
export declare const isHex: (value: string, length?: number) => boolean;
/**
 * Converts a string to a hex string with 0x prefix.
 *
 * Supported input formats:
 * - Byte array string: "[1, 2, 3, ...]"
 * - Hex string: "0xabc123..." or "abc123..."
 * - Base64 string: "VGhpcyBpcyBhIHRlc3Qgc3RyaW5nLg=="
 * - Base58 string: "12DsSDs23..."
 *
 * @param value - The string to convert to hex
 * @returns A hex string with 0x prefix
 * @throws Error if the input cannot be decoded into a valid format
 *
 * @example
 * toHex("[1, 2, 3]") // returns "0x010203"
 * toHex("0xabc123") // returns "0xabc123"
 */
export declare const toHex: (value: string) => string;
/**
 * Determine whether a given string is base64 encoded
 * @param value - the string to verify
 * @returns boolean indicating if a value is a base64 encoded string
 */
export declare const isBase64: (value: string, length?: number) => boolean;
/**
 * Attempt to parse a string into a valid a buffer format.
 *
 * Accepted formats:
 *  - byte array "[1, 2, 3, ...]"
 *  - hex string "0xabc123..."
 *  - base64 string "VGhpcyBpcyBhIHRlc3Qgc3RyaW5nLg=="
 *  - base58 string "12DsSDs23..."
 *
 * @returns the parsed string in Buffer format or undefined if no regex matches found
 */
export declare const decodeString: (data: string) => Buffer | undefined;
export type RawBuffer = string | Buffer | Uint8Array | number[];
export declare function parseMrEnclave(hexString: string): Uint8Array;
export declare function parseRawMrEnclave(rawBuffer: RawBuffer, addMissingBytes?: boolean): Uint8Array;
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