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/*
* Copyright (c) 2000-2018, 达梦数据库有限公司.
* All rights reserved.
*/
package security
import (
"crypto/rand"
"errors"
"io"
"math/big"
)
type dhGroup struct {
p *big.Int
g *big.Int
}
func newDhGroup(prime, generator *big.Int) *dhGroup {
return &dhGroup{
p: prime,
g: generator,
}
}
func (dg *dhGroup) P() *big.Int {
p := new(big.Int)
p.Set(dg.p)
return p
}
func (dg *dhGroup) G() *big.Int {
g := new(big.Int)
g.Set(dg.g)
return g
}
// 生成本地公私钥
func (dg *dhGroup) GeneratePrivateKey(randReader io.Reader) (key *DhKey, err error) {
if randReader == nil {
randReader = rand.Reader
}
// 0 < x < p
x, err := rand.Int(randReader, dg.p)
if err != nil {
return
}
zero := big.NewInt(0)
for x.Cmp(zero) == 0 {
x, err = rand.Int(randReader, dg.p)
if err != nil {
return
}
}
key = new(DhKey)
key.x = x
// y = g ^ x mod p
key.y = new(big.Int).Exp(dg.g, x, dg.p)
key.group = dg
return
}
func (dg *dhGroup) ComputeKey(pubkey *DhKey, privkey *DhKey) (kye *DhKey, err error) {
if dg.p == nil {
err = errors.New("DH: invalid group")
return
}
if pubkey.y == nil {
err = errors.New("DH: invalid public key")
return
}
if pubkey.y.Sign() <= 0 || pubkey.y.Cmp(dg.p) >= 0 {
err = errors.New("DH parameter out of bounds")
return
}
if privkey.x == nil {
err = errors.New("DH: invalid private key")
return
}
k := new(big.Int).Exp(pubkey.y, privkey.x, dg.p)
key := new(DhKey)
key.y = k
key.group = dg
return
}
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