60 lines
2.2 KiB
Go
60 lines
2.2 KiB
Go
// 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 "github.com/deroproject/derohe/crypto/bn256"
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// BUG BUG BUG this needs to be updated and add more context
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// this function is used to encrypt/decrypt payment id
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// as the operation is symmetric XOR, is the same in both direction
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//
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func EncryptDecryptPaymentID(blinder *bn256.G1, input []byte) (output []byte) {
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// input must be exactly 8 bytes long
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if len(input) != 8 {
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panic("Encrypted payment ID must be exactly 8 bytes long")
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}
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output = make([]byte, 8, 8)
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blinder_compressed := blinder.EncodeCompressed()
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if len(blinder_compressed) != 33 {
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panic("point compression needs to be fixed")
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}
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// Todo we should take the hash
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blinder_compressed = blinder_compressed[25:] // we will use last 8 bytes
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for l := range input {
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output[l] = input[l] ^ blinder_compressed[l] // xor the bytes with the hash
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}
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/*
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var tmp_buf [33]byte
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copy(tmp_buf[:], derivation[:]) // copy derivation key to buffer
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tmp_buf[32] = ENCRYPTED_PAYMENT_ID_TAIL
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// take hash
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hash := crypto.Keccak256(tmp_buf[:]) // take hash of entire 33 bytes, 32 bytes derivation key, 1 byte tail
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output = make([]byte, 8, 8)
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for i := range input {
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output[i] = input[i] ^ hash[i] // xor the bytes with the hash
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}
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*/
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return
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}
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