/**
 * Asserts a condition and throws when it fails.
 * @param condition Condition to evaluate.
 * @param message Error message when condition fails.
 */
export declare function assert(condition: boolean, message: string): void;
/**
 * Checks whether input is a 32-byte scalar.
 * @param x Input bytes.
 * @returns True when input is a scalar.
 */
export declare function isScalar(x: Uint8Array): boolean;
/**
 * Validates a secp256k1 private key range.
 * @param privateKey Private key bytes.
 * @returns True when key is valid.
 */
export declare function isValidPrivateKey(privateKey: Uint8Array): boolean;
/**
 * Compares two byte arrays lexicographically.
 * @param a First byte array.
 * @param b Second byte array.
 * @returns -1, 0, or 1 depending on comparison result.
 */
export declare function compareBuffers(a: Uint8Array, b: Uint8Array): number;
/**
 * Compares two byte arrays in constant time.
 * @param b1 First byte array.
 * @param b2 Second byte array.
 * @returns True when arrays are equal.
 */
export declare function equalConstTime(b1: Uint8Array, b2: Uint8Array): boolean;
/**
 * Validates random key length constraints.
 * @param length Requested length.
 * @returns True when length is valid.
 */
export declare function isValidKeyLength(length: number): boolean;
/**
 * Validates a private key and throws when invalid.
 * @param privateKey Private key bytes.
 */
export declare function checkPrivateKey(privateKey: Uint8Array): void;
/**
 * Validates a public key and throws when invalid.
 * @param publicKey Public key bytes.
 */
export declare function checkPublicKey(publicKey: Uint8Array): void;
/**
 * Validates message bytes and throws when invalid.
 * @param msg Message bytes.
 */
export declare function checkMessage(msg: Uint8Array): void;
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