// Copyright 2017-2021 DERO Project. All rights reserved. // Use of this source code in any form is governed by RESEARCH license. // license can be found in the LICENSE file. // GPG: 0F39 E425 8C65 3947 702A 8234 08B2 0360 A03A 9DE8 // // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL // THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, // STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. package crypto import "fmt" const POINT_SIZE = 33 // this can be optimized to 33 bytes const FIELDELEMENT_SIZE = 32 // why not have bigger curves // protocol supports amounts upto this amounts const MAX_AMOUNT = 18446744073709551616 // 2^64 - 1, const PROTOCOL_CONSTANT = "DERO" // checks a number is power of 2 func IsPowerOf2(num int) bool { for num >= 2 { if num%2 != 0 { return false } num = num / 2 } return num == 1 } // tell what power a number is func GetPowerof2(num int) int { if num <= 0 { panic("number cannot be less than 0") } if !IsPowerOf2(num) { panic(fmt.Sprintf("number(%d) must be power of 2", num)) } power := 0 calculated := 1 for ; calculated != num; power++ { calculated *= 2 } return power }