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