init: v1.0.0

tpc/sm2/sm2a/gen_enc_key_server.go

@@ -0,0 +1,32 @@
+package sm2a
+
+import (
+	"fmt"
+	"io"
+	"math/big"
+
+	"xdx.jelly/xgcl/gmath"
+	"xdx.jelly/xgcl/sm/sm2"
+)
+
+// ServerEncKeyGen 服务端加密密钥生成
+func ServerEncKeyGen(in []byte, rand io.Reader) (*sm2.PrivateKey, *sm2.PublicKey, []byte, error) {
+
+	buf := make([]byte, sm2.ByteSize())
+	if n, err := rand.Read(buf); n != len(buf) || err != nil {
+		return nil, nil, nil, fmt.Errorf("Generate random number error")
+	}
+	ds, _ := sm2.GenPrivateKey(buf)
+	pk := sm2.GenPublicKey(ds)
+	out := make([]byte, 0, 2*sm2.ByteSize())
+	out = append(out, gmath.BigIntToNByte(pk.X, sm2.ByteSize())...)
+	out = append(out, gmath.BigIntToNByte(pk.Y, sm2.ByteSize())...)
+
+	x := new(big.Int)
+	y := new(big.Int)
+	x.SetBytes(in[:sm2.ByteSize()])
+	y.SetBytes(in[sm2.ByteSize() : 2*sm2.ByteSize()])
+	pk.X, pk.Y = sm2.Curve().Add(pk.X, pk.Y, x, y)
+
+	return ds, pk, out, nil
+}