/**
 * Identity Module
 *
 * Ed25519 key pair generation, DID derivation, and local identity storage.
 * DESIGN.md §6.1 — Every actor is an Identity entity with a cryptographic key pair.
 *
 * Private keys are stored locally in `.trellis/identity.json` (never synced).
 * Public keys and DIDs are graph entities that get replicated to peers.
 */
export interface IdentityConfig {
    displayName: string;
    email?: string;
    /** Ed25519 public key, base64-encoded. */
    publicKey: string;
    /** Ed25519 private key, base64-encoded (local only, never synced). */
    privateKey: string;
    /** did:key identifier derived from public key. */
    did: string;
    /** Entity ID for use in the EAV store. */
    entityId: string;
    /** ISO timestamp of creation. */
    createdAt: string;
}
export interface PublicIdentity {
    displayName: string;
    email?: string;
    publicKey: string;
    did: string;
    entityId: string;
    createdAt: string;
}
/**
 * Generate a new Ed25519 identity.
 */
export declare function createIdentity(opts: {
    displayName: string;
    email?: string;
}): IdentityConfig;
/**
 * Sign a message (typically an op hash) with a private key.
 */
export declare function signMessage(message: string, privateKeyBase64: string): string;
/**
 * Verify a signature against a message and public key.
 */
export declare function verifySignature(message: string, signatureBase64: string, publicKeyBase64: string): boolean;
/**
 * Save an identity to the local .trellis directory.
 */
export declare function saveIdentity(trellisDir: string, identity: IdentityConfig): void;
/**
 * Load the local identity from .trellis/identity.json.
 */
export declare function loadIdentity(trellisDir: string): IdentityConfig | null;
/**
 * Check if a local identity exists.
 */
export declare function hasIdentity(trellisDir: string): boolean;
/**
 * Extract the public (safe-to-share) portion of an identity.
 */
export declare function toPublicIdentity(identity: IdentityConfig): PublicIdentity;
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