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81 lines
2.4 KiB
Go
81 lines
2.4 KiB
Go
// This code is forked from https://github.com/wsddn/go-ecdh/blob/master/curve25519.go
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/*
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Copyright (c) 2014, tang0th
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of tang0th nor the names of its contributors may be
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used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package ecdh
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import (
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"crypto"
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"io"
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"golang.org/x/crypto/curve25519"
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)
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func GenerateKey(rand io.Reader) (crypto.PrivateKey, crypto.PublicKey, error) {
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var pub, priv [32]byte
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var err error
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_, err = io.ReadFull(rand, priv[:])
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if err != nil {
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return nil, nil, err
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}
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priv[0] &= 248
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priv[31] &= 127
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priv[31] |= 64
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curve25519.ScalarBaseMult(&pub, &priv)
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return &priv, &pub, nil
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}
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func Marshal(p crypto.PublicKey) []byte {
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pub := p.(*[32]byte)
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return pub[:]
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}
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func Unmarshal(data []byte) (crypto.PublicKey, bool) {
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var pub [32]byte
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if len(data) != 32 {
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return nil, false
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}
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copy(pub[:], data)
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return &pub, true
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}
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func GenerateSharedSecret(privKey crypto.PrivateKey, pubKey crypto.PublicKey) []byte {
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var priv, pub, secret *[32]byte
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priv = privKey.(*[32]byte)
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pub = pubKey.(*[32]byte)
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secret = new([32]byte)
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curve25519.ScalarMult(secret, priv, pub)
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return secret[:]
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}
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