/**
 * Fingerprint Reference Conversion Functions (v0.11.3+)
 *
 * Pure string manipulation functions for converting between Wire 0.1
 * string form ("alg:hex64") and Wire 0.2 object form ({ alg, value, key_id? }).
 *
 * These are opaque references. The schema validates format only.
 * Issuers compute values externally; verifiers MUST NOT assume
 * they can recompute the reference.
 *
 * Lives in Layer 1 (@peac/schema) because it is pure string manipulation,
 * not cryptographic computation. Zero dependencies, zero I/O.
 */
/**
 * Wire 0.2 object form of a fingerprint reference
 */
export interface FingerprintRefObject {
    /** Hash algorithm: 'sha256' or 'hmac-sha256' */
    alg: string;
    /** Base64url-encoded value */
    value: string;
    /** Optional key identifier (for hmac-sha256 references) */
    key_id?: string;
}
/**
 * Maximum length for fingerprint reference string form.
 * "hmac-sha256:" (12) + 64 hex chars = 76 chars max.
 */
export declare const MAX_FINGERPRINT_REF_LENGTH = 76;
/**
 * Parse a Wire 0.1 string form fingerprint reference ("alg:hex64")
 * into a Wire 0.2 object form ({ alg, value }).
 *
 * The hex value is converted to base64url for the object form.
 *
 * @param s - String form: "sha256:<64 hex chars>" or "hmac-sha256:<64 hex chars>"
 * @returns Object form with base64url value, or null if invalid
 */
export declare function stringToFingerprintRef(s: string): FingerprintRefObject | null;
/**
 * Convert a Wire 0.2 object form fingerprint reference back to
 * the Wire 0.1 string form ("alg:hex64").
 *
 * The base64url value is converted back to hex for the string form.
 *
 * @param obj - Object form with alg and base64url value
 * @returns String form "alg:<64 hex chars>", or null if invalid
 */
export declare function fingerprintRefToString(obj: FingerprintRefObject): string | null;
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