init: v1.0.0

2026-05-27 23:03:00 +08:00
commit 8d97f750eb
466 changed files with 80067 additions and 0 deletions
@@ -0,0 +1,38 @@
+package sm2m
+
+import (
+	"math/big"
+
+	"xdx.jelly/xgcl/gmath"
+	"xdx.jelly/xgcl/sm/sm2"
+)
+
+/*
+导入加密密钥de，由sm2签名密钥来解密sm2加密密钥保护结构。
+解密de后拆分也同签名密钥拆分
+(1+de)^{-1} = de_c*de_s
+为了加解密函数一致
+*/
+
+// ServerDec 服务端计算(serverKey)^(-1)*C1，使用签名密钥解密加密密钥保护结构
+func ServerImportKey(serverKey *sm2.PrivateKey, in []byte) ([]byte, error) {
+	if len(in) < 2*sm2.ByteSize() {
+		return []byte{}, ErrIndataError
+	}
+
+	x := new(big.Int)
+	x.SetBytes(in[:sm2.ByteSize()])
+	y := new(big.Int)
+	y.SetBytes(in[sm2.ByteSize() : 2*sm2.ByteSize()])
+
+	sInv := new(big.Int)
+	sInv.Set(serverKey.D)
+	sInv.ModInverse(sInv, sm2.OrderN())
+
+	x, y = sm2.Curve256.ScalarMult(x, y, sInv.Bytes())
+	out := make([]byte, 0, 2*sm2.ByteSize())
+	out = append(out, gmath.BigIntToNByte(x, sm2.ByteSize())...)
+	out = append(out, gmath.BigIntToNByte(y, sm2.ByteSize())...)
+
+	return out, nil
+}