The full codes:
package main
import (
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"encoding/hex"
"fmt"
"math/big"
)
func main() {
key2, _ :=
hex.DecodeString("646d22e7aee42d44bd15cdf58006359283e1da83c2670b25d44906d03e9ed4eb")
X2, _ :=
new(big.Int).SetString("3842ab25368451a004bb57f2008106aa18578a2887f5a34d17c92a0f6c22241f",
16)
Y2, _ :=
new(big.Int).SetString("72be1183f839f5a9e8841873cd074151da8dd5881fffc7668e2c189c142dad4c",
16)
priv2, _ := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
aeskey2, _ := priv2.Curve.ScalarMult(X2, Y2, key2)
fmt.Printf("to: %x\n", aeskey2)
}
在 2017年6月1日星期四 UTC+8下午12:01:49，张伟写道：
>
> I am using ECC ScalarMult to get a point. When I use the amd64 accelerated
> version, the result is wrong; by using the generic version, the result is
> normal.
> My code is here:
>
> k, _ :=
> hex.DecodeString("646d22e7aee42d44bd15cdf58006359283e1da83c2670b25d44906d03e9ed4eb")
> X, _ :=
> new(big.Int).SetString("3842ab25368451a004bb57f2008106aa18578a2887f5a34d17c92a0f6c22241f",
>
> 16)
> Y, _ :=
> new(big.Int).SetString("72be1183f839f5a9e8841873cd074151da8dd5881fffc7668e2c189c142dad4c",
>
> 16)
>
> priv, _ := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
> p, _ := priv.Curve.ScalarMult(X, Y, k)
> fmt.Printf("%x\n", p)
>
>
> I need
> "D68B74C852C7F4D271AB7ADC8B451943688DCDFA3F4CA37841CE325461AEEB1B169D519667ABB11651FEDDBCF1F4C52A4FF8A93ACE1C270E8523FDC842AFF005",
> but I get
> "240AD1096C1C7CBF180067AC3F214DE462881FF3FCFC77B7516762E2BD2AA931D7C99D8200DD54B4182D81C77E720151750FAF26FAB6CF89603C57B46B2BDD85"
>
>
> Thanks for your help!
>
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