import { AuthBigInteger } from './BigInteger';
/**
 * Returns an unambiguous, even-length hex string of the two's complement encoding of an integer.
 *
 * It is compatible with the hex encoding of Java's BigInteger's toByteArray(), wich returns a
 * byte array containing the two's-complement representation of a BigInteger. The array contains
 * the minimum number of bytes required to represent the BigInteger, including at least one sign bit.
 *
 * Examples showing how ambiguity is avoided by left padding with:
 * 	"00" (for positive values where the most-significant-bit is set)
 *  "FF" (for negative values where the most-significant-bit is set)
 *
 * padHex(bigInteger.fromInt(-236))  === "FF14"
 * padHex(bigInteger.fromInt(20))    === "14"
 *
 * padHex(bigInteger.fromInt(-200))  === "FF38"
 * padHex(bigInteger.fromInt(56))    === "38"
 *
 * padHex(bigInteger.fromInt(-20))   === "EC"
 * padHex(bigInteger.fromInt(236))   === "00EC"
 *
 * padHex(bigInteger.fromInt(-56))   === "C8"
 * padHex(bigInteger.fromInt(200))   === "00C8"
 *
 * @param {AuthBigInteger} bigInt Number to encode.
 * @returns {String} even-length hex string of the two's complement encoding.
 */
export declare const getPaddedHex: (bigInt: AuthBigInteger) => string;