export declare const PEPPER_SEPARATOR = "__";
/**
 * Standardized prefixes for ODIS identifiers.
 *
 * @remarks These prefixes prevent collisions between off-chain identifiers.
 * i.e. if a user's instagram and twitter handles are the same,
 * these prefixes prevent the ODIS identifers from being the same.
 *
 * If you would like to use a prefix that isn't included, please put up a PR
 * adding it to @celo/base (in celo-monorepo/packages/sdk/base/src/identifier.ts)
 * to ensure interoperability with other projects. When adding new prefixes,
 * please use either the full platform name in all lowercase (e.g. 'facebook')
 * or DID methods https://w3c.github.io/did-spec-registries/#did-methods.
 * Make sure to add the expected value for the unit test case in
 * `celo-monorepo/packages/sdk/base/src/identifier.test.ts`,
 * otherwise the test will fail.
 *
 * The NULL prefix is included to allow projects to use the sdk without selecting
 * a predefined prefix or adding their own. Production use of the NULL prefix is
 * discouraged since identifiers will not be interoperable with other projects.
 * Please think carefully before using the NULL prefix.
 */
export declare enum IdentifierPrefix {
    NULL = "",
    PHONE_NUMBER = "tel",
    EMAIL = "mailto",
    TWITTER = "twit",
    FACEBOOK = "facebook",
    INSTAGRAM = "instagram",
    DISCORD = "discord",
    TELEGRAM = "telegram",
    SIGNAL = "signal"
}
/**
 * Concatenates the identifierPrefix and plaintextIdentifier with the separator '://'
 *
 * @param plaintextIdentifier Off-chain identifier, ex: phone number, twitter handle, email, etc.
 * @param identifierPrefix Standardized prefix used to prevent collisions between identifiers
 */
export declare const getPrefixedIdentifier: (plaintextIdentifier: string, identifierPrefix: IdentifierPrefix) => string;
/**
 * Helper function for getIdentifierHash in @celo/identity, so that this can
 * be used in protocol tests without dependency issues.
 *
 * @remarks
 * Concatenates the plaintext prefixed identifier with the pepper derived by hashing the unblinded
 * signature returned by ODIS.
 *
 * @param sha3 Hash function (i.e. soliditySha3) to use to generate the identifier
 * @param plaintextIdentifier Off-chain identifier, ex: phone number, twitter handle, email, etc.
 * @param identifierPrefix Standardized prefix used to prevent collisions between identifiers
 * @param pepper Hash of the unblinded signature returned by ODIS
 */
export declare const getIdentifierHash: (sha3: (a: string) => string | null, plaintextIdentifier: string, identifierPrefix: IdentifierPrefix, pepper: string) => string;