/**
 * @license
 * Copyright 2020 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
/**
 * Supported elliptic curves.
 */
export declare enum CurveType {
    P256 = 1,
    P384 = 2,
    P521 = 3
}
/**
 * Supported point format.
 */
export declare enum PointFormatType {
    UNCOMPRESSED = 1,
    COMPRESSED = 2,
    DO_NOT_USE_CRUNCHY_UNCOMPRESSED = 3
}
/**
 * Supported ECDSA signature encoding.
 */
export declare enum EcdsaSignatureEncodingType {
    DER = 1,
    IEEE_P1363 = 2
}
/**
 * Transform an ECDSA signature in DER encoding to IEEE P1363 encoding.
 *
 * @param der the ECDSA signature in DER encoding
 * @param ieeeLength the length of the ECDSA signature in IEEE
 *     encoding. This is usually 2 * size of the elliptic curve field.
 * @return ECDSA signature in IEEE encoding
 */
export declare function ecdsaDer2Ieee(der: Uint8Array, ieeeLength: number): Uint8Array;
/**
 * Transform an ECDSA signature in IEEE 1363 encoding to DER encoding.
 *
 * @param ieee the ECDSA signature in IEEE encoding
 * @return ECDSA signature in DER encoding
 */
export declare function ecdsaIeee2Der(ieee: Uint8Array): Uint8Array;
/**
 * Validate that the ECDSA signature is in DER encoding, based on
 * https://github.com/bitcoin/bips/blob/master/bip-0066.mediawiki.
 *
 * @param sig an ECDSA siganture
 */
export declare function isValidDerEcdsaSignature(sig: Uint8Array): boolean;
export declare function curveToString(curve: CurveType): string;
export declare function curveFromString(curve: string): CurveType;
/** Helper method for unit tests. */
export declare function formatFromString(format: string): PointFormatType;
export declare function pointEncode(curve: string, format: PointFormatType, point: JsonWebKey): Uint8Array;
/** Converts byte array to bigint. */
export declare function byteArrayToInteger(bytes: Uint8Array): bigint;
/** Converts bigint to byte array. */
export declare function integerToByteArray(i: bigint): Uint8Array;
export declare function pointDecode(curve: string, format: PointFormatType, point: Uint8Array): JsonWebKey;
export declare function getJsonWebKey(curve: CurveType, x: Uint8Array, y: Uint8Array, d?: Uint8Array | null): JsonWebKey;
export declare function fieldSizeInBytes(curve: CurveType): number;
export declare function encodingSizeInBytes(curve: CurveType, pointFormat: PointFormatType): number;
export declare function computeEcdhSharedSecret(privateKey: CryptoKey, publicKey: CryptoKey): Promise<Uint8Array>;
export declare function generateKeyPair(algorithm: 'ECDH' | 'ECDSA', curve: string): Promise<CryptoKeyPair>;
export declare function exportCryptoKey(cryptoKey: CryptoKey): Promise<JsonWebKey>;
export declare function importPublicKey(algorithm: string, jwk: JsonWebKey): Promise<CryptoKey>;
export declare function importPrivateKey(algorithm: string, jwk: JsonWebKey): Promise<CryptoKey>;