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 +1,84 @@
+package sm2
+
+import (
+	"hash"
+	"math/big"
+
+	"xdx.jelly/xgcl/gmath"
+	"xdx.jelly/xgcl/sm/sm3"
+)
+
+var (
+	// abg曲线相关参数，若曲线参数改变了，应该改变这里的数值。
+	// 在init中从sm2Curve.Params()生成。
+	abg []byte
+)
+
+func initPrecompute() {
+	abg = make([]byte, 0, 4*byteSize)
+	abg = append(abg, gmath.BigIntToNByte(new(big.Int).Sub(sm2Curve.Params().P, gmath.BigInt3), byteSize)...)
+	abg = append(abg, gmath.BigIntToNByte(sm2Curve.Params().B, byteSize)...)
+	abg = append(abg, gmath.BigIntToNByte(sm2Curve.Params().Gx, byteSize)...)
+	abg = append(abg, gmath.BigIntToNByte(sm2Curve.Params().Gy, byteSize)...)
+
+	// abg = []byte{
+	// 	0xFF, 0xFF, 0xFF, 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, /* a */
+	// 	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+	// 	0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+	// 	0xFF, 0xFC,
+	// 	0x28, 0xE9, 0xFA, 0x9E, 0x9D, 0x9F, 0x5E, 0x34, 0x4D, 0x5A, /* b */
+	// 	0x9E, 0x4B, 0xCF, 0x65, 0x09, 0xA7, 0xF3, 0x97, 0x89, 0xF5,
+	// 	0x15, 0xAB, 0x8F, 0x92, 0xDD, 0xBC, 0xBD, 0x41, 0x4D, 0x94,
+	// 	0x0E, 0x93,
+	// 	0x32, 0xC4, 0xAE, 0x2C, 0x1F, 0x19, 0x81, 0x19, 0x5F, 0x99, /* Gx */
+	// 	0x04, 0x46, 0x6A, 0x39, 0xC9, 0x94, 0x8F, 0xE3, 0x0B, 0xBF,
+	// 	0xF2, 0x66, 0x0B, 0xE1, 0x71, 0x5A, 0x45, 0x89, 0x33, 0x4C,
+	// 	0x74, 0xC7,
+	// 	0xBC, 0x37, 0x36, 0xA2, 0xF4, 0xF6, 0x77, 0x9C, 0x59, 0xBD, /* Gy */
+	// 	0xCE, 0xE3, 0x6B, 0x69, 0x21, 0x53, 0xD0, 0xA9, 0x87, 0x7C,
+	// 	0xC6, 0x2A, 0x47, 0x40, 0x02, 0xDF, 0x32, 0xE5, 0x21, 0x39,
+	// 	0xF0, 0xA0,
+	// }
+}
+
+// GetDefaultID rt
+func GetDefaultID() []byte {
+
+	return []byte{
+		0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38,
+		0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38,
+	}
+}
+
+// PreComputeWithIdAndPubkey 预计算Z
+// id = nil使用默认id, len(id)==0则使用空， 如[]byte("")
+// 注：基本上所有情况下，都是用默认id。所以id仅可传入默认id或nil.
+func PreComputeWithIdAndPubkey(id []byte, pubkey *PublicKey) []byte {
+	var entl [2]byte
+	var d hash.Hash
+
+	if id == nil {
+		d = sm3.NewSm2Precomputed()
+	} else {
+		d = sm3.New()
+		entl[0] = byte((len(id) >> 5) & 0xff)
+		entl[1] = byte((len(id) << 3) & 0xff)
+		d.Write(entl[:])
+		d.Write(id)
+		d.Write(abg)
+	}
+
+	d.Write(gmath.BigIntToNByte(pubkey.X, byteSize))
+	d.Write(gmath.BigIntToNByte(pubkey.Y, byteSize))
+	return d.Sum(nil)
+}
+
+// PreComputeWithIdAndPubkeyAndMessage 计算 e=hash(z||m)
+// z由PreComputeWithIdAndPubkey计算
+func PreComputeWithIdAndPubkeyAndMessage(id, msg []byte, pubkey *PublicKey) []byte {
+	e := PreComputeWithIdAndPubkey(id, pubkey)
+	d := sm3.New()
+	d.Write(e)
+	d.Write(msg)
+	return d.Sum(e[:0])
+}