export type EncryptionAlgorithm = 'aes-256-ctr' | 'aes-128-ctr' | 'chacha20';
export type ZKEngine = 'snarkjs' | 'gnark' | 'stwo';
export type UintArray = Uint32Array;
export type Proof = {
    algorithm: EncryptionAlgorithm;
    /** serialised proof */
    proofData: ZKProof;
    /**
     * the plaintext obtained as an output
     * of the ZK circuit
     * Will be `undefined` if proving with TOPRF
     */
    plaintext: Uint8Array | undefined;
};
export type FileFetch = {
    fetch(engine: ZKEngine, filename: string, logger?: Logger): Promise<Uint8Array>;
};
export type MakeZKOperatorOpts<T> = {
    algorithm: EncryptionAlgorithm;
    fetcher: FileFetch;
    options?: T;
};
export type MakeZKOperator<T> = (opts: MakeZKOperatorOpts<T>) => ZKOperator;
export type MakeOPRFOperator<T> = (opts: MakeZKOperatorOpts<T>) => OPRFOperator;
/**
 * provide Uint8array for file data loaded into memory
 * or string, that is the path to load said file
 * */
type ZKInput = Uint8Array | string;
export type VerificationKey = {
    /** binary data for .zkey file */
    data: ZKInput;
    json?: unknown;
};
export type CircuitWasm = Uint8Array | string;
export type GenerateWitnessOpts = {
    /**
     * the algorithm to use for the encryption
     * circuit. Used to correctly slice the
     * IV, counters etc.
     */
    algorithm: EncryptionAlgorithm;
    /**
     * private input to the circuit (i.e. key)
     */
    privateInput: PrivateInput;
    /**
     * public input to the circuit,
     * i.e. the ciphertext to decrypt
     */
    publicInput: PublicInput;
} & ({
    mask: ZKInputItem;
    toprf: ZKTOPRFPublicSignals;
} | {});
export type GenerateProofOpts = GenerateWitnessOpts & {
    /**
     * Operator to use for proving the circuit
     */
    operator: ZKOperator | OPRFOperator;
    logger?: Logger;
};
export type GetPublicSignalsOpts = {
    algorithm: EncryptionAlgorithm;
    publicInput: PublicInput;
} & ({
    plaintext: Uint8Array | undefined;
} | {
    key: Uint8Array;
});
export type VerifyProofOpts = {
    proof: Proof;
    publicInput: PublicInput;
} & ({
    operator: ZKOperator;
    logger?: Logger;
} | {
    operator: OPRFOperator;
    logger?: Logger;
    toprf: ZKTOPRFPublicSignals;
});
export type AlgorithmConfig = {
    index: number;
    /**
     * Chunk size in words (of the algorithm)
     * eg. chacha20 has 32-bit words, aes-256-ctr has 8-bit words
     */
    chunkSize: number;
    bitsPerWord: number;
    keySizeBytes: number;
    ivSizeBytes: number;
    startCounter: number;
    blocksPerChunk: number;
    isLittleEndian: boolean;
    uint8ArrayToBits: (arr: Uint8Array) => number[];
    bitsToUint8Array: (bits: number[]) => Uint8Array;
    /**
     * Encrypt some ciphertext with the given key and IV
     */
    encrypt(opts: {
        key: Uint8Array;
        iv: Uint8Array;
        in: Uint8Array;
    }): Promise<Uint8Array> | Uint8Array;
};
type ZKProof = string | Uint8Array;
type ZKProofOutput = {
    proof: ZKProof;
};
type ZKInputItem = Uint8Array;
export type ZKTOPRFResponsePublicSignals = {
    publicKeyShare: ZKInputItem;
    evaluated: ZKInputItem;
    c: ZKInputItem;
    r: ZKInputItem;
};
type TOPRFLocation = {
    pos: number;
    len: number;
};
export type ZKTOPRFPublicSignals = {
    locations: TOPRFLocation[];
    domainSeparator: string;
    output: ZKInputItem;
    responses: ZKTOPRFResponsePublicSignals[];
};
export type BlockInfo = {
    nonce: ZKInputItem;
    counter: number;
    boundary: number | undefined;
};
export type ZKProofPublicSignals = {
    noncesAndCounters: BlockInfo[];
    in: ZKInputItem;
    out: ZKInputItem;
};
export type ZKProofPublicSignalsOPRF = ZKProofPublicSignals & {
    toprf: ZKTOPRFPublicSignals;
};
export type ZKProofInput = {
    key: ZKInputItem;
} & ZKProofPublicSignals;
export type ZKProofInputOPRF = {
    key: ZKInputItem;
    mask: ZKInputItem;
} & ZKProofPublicSignalsOPRF;
export type OPRFRequestData = {
    mask: Uint8Array;
    maskedData: Uint8Array;
    secretElements: Uint8Array[];
};
type OPRFResponse = {
    evaluated: Uint8Array;
    c: Uint8Array;
    r: Uint8Array;
};
export type OPRFResponseData = OPRFResponse & {
    publicKeyShare: Uint8Array;
};
export type KeyShare = {
    index: number;
    publicKey: Uint8Array;
    privateKey: Uint8Array;
};
export type KeygenResult = {
    publicKey: Uint8Array;
    privateKey: Uint8Array;
    shares: KeyShare[];
};
/**
 * the operator to use for proving and verifying the groth16
 * proof of the ChaCha20 circuit
 *
 * this generic interface is allow
 * for different implementations
 */
export type ZKOperator = {
    generateWitness(input: ZKProofInput, logger?: Logger): Promise<Uint8Array> | Uint8Array;
    groth16Prove(witness: Uint8Array, logger?: Logger): Promise<ZKProofOutput>;
    groth16Verify(publicSignals: ZKProofPublicSignals, proof: ZKProof, logger?: Logger): Promise<boolean>;
    /**
     * Release any used resources. The operator
     * should still be usable after this call.
     *
     * This is useful for releasing any resources
     * in case ZK operations are not going to be
     * used for a while.
     */
    release?(): void;
};
export type OPRFOperator = {
    generateWitness(input: ZKProofInputOPRF, logger?: Logger): Promise<Uint8Array>;
    groth16Prove(witness: Uint8Array, logger?: Logger): Promise<ZKProofOutput>;
    groth16Verify(publicSignals: ZKProofPublicSignalsOPRF, proof: ZKProof, logger?: Logger): Promise<boolean>;
    generateThresholdKeys(total: number, threshold: number, logger?: Logger): Promise<KeygenResult>;
    generateOPRFRequestData(data: Uint8Array, domainSeparator: string, logger?: Logger): Promise<OPRFRequestData>;
    finaliseOPRF(serverPublicKey: Uint8Array, request: OPRFRequestData, responses: OPRFResponseData[], logger?: Logger): Promise<Uint8Array>;
    evaluateOPRF(serverPrivateKey: Uint8Array, request: Uint8Array, logger?: Logger): Promise<OPRFResponse>;
    /**
     * Release any used resources. The operator
     * should still be usable after this call.
     *
     * This is useful for releasing any resources
     * in case ZK operations are not going to be
     * used for a while.
     */
    release?(): void;
};
export type PrivateInput = {
    /** 256 bit ChaCha20 key to decrypt ciphertext */
    key: Uint8Array;
};
export type RawPublicInput = {
    /** the ciphertext to decrypt */
    ciphertext: Uint8Array;
    /** 192 bit IV for the ciphertext decryption */
    iv: Uint8Array;
    /**
     * If the passed ciphertext is a slice of the original ciphertext,
     * what offset (in bytes) does this slice start from?
     * */
    offsetBytes?: number;
};
export type PublicInput = RawPublicInput | RawPublicInput[];
export type Logger = Pick<typeof console, 'info' | 'trace' | 'debug' | 'error' | 'warn'>;
export {};