/**
 * Cryptographic signature utilities
 * Uses ed25519 for signing and verification
 */
export declare class SignatureUtils {
    /**
     * Generate a new keypair
     */
    generateKeyPair(): {
        privateKey: string;
        publicKey: string;
    };
    /**
     * Sign a message
     */
    sign(message: string, privateKeyHex: string): Promise<string>;
    /**
     * Verify a signature
     */
    verify(message: string, signatureHex: string, publicKeyHex: string): Promise<boolean>;
    /**
     * Get public key from private key
     */
    getPublicKey(privateKeyHex: string): string;
}
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