/**
 * Generate a new API key with the format: arc_{32 hex chars}
 * Returns both the plaintext key and its SHA-256 hash.
 */
export declare function generateApiKey(): {
    plaintext: string;
    hash: string;
    prefix: string;
};
/**
 * SHA-256 hash of an API key (for storage and lookup).
 */
export declare function hashApiKey(key: string): string;
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