first commit

clientsdk/android/random.go

@@ -0,0 +1,94 @@
+package android
+
+import (
+	"bytes"
+	"crypto/elliptic"
+	"crypto/md5"
+	"crypto/rand"
+	"encoding/binary"
+	"fmt"
+	"hash/adler32"
+	"io"
+	"time"
+)
+
+func RandBytes(size int) []byte {
+
+	r := make([]byte, size)
+	n, err := io.ReadFull(rand.Reader, r)
+	if err != nil || n != size {
+		fmt.Println("Gen rand faile")
+		return nil
+	}
+	return r
+}
+
+func Gen713Key() ([]byte, []byte) {
+
+	priv, x, y, _ := elliptic.GenerateKey(elliptic.P224(), rand.Reader)
+
+	pub := elliptic.Marshal(elliptic.P224(), x, y)
+
+	return pub, priv
+}
+
+func Do713Ecdh(pub, priv []byte) []byte {
+	curve := elliptic.P224()
+	x, y := elliptic.Unmarshal(curve, pub)
+	if x == nil {
+		return nil
+	}
+
+	xShared, _ := curve.ScalarMult(x, y, priv)
+	sharedKey := make([]byte, (curve.Params().BitSize+7)>>3)
+	xBytes := xShared.Bytes()
+	copy(sharedKey[len(sharedKey)-len(xBytes):], xBytes)
+
+	dh := md5.Sum(sharedKey)
+	return dh[:]
+}
+
+func GenSignature(uiCryptin uint32, salt, data []byte) uint32 {
+
+	var b1 bytes.Buffer
+	binary.Write(&b1, binary.BigEndian, uiCryptin)
+
+	h1 := md5.New()
+	h1.Write(b1.Bytes())
+	h1.Write(salt)
+	sum1 := h1.Sum(nil)
+
+	dataSize := len(data)
+	var b2 bytes.Buffer
+	binary.Write(&b2, binary.BigEndian, dataSize)
+
+	h2 := md5.New()
+	h2.Write(b2.Bytes())
+	h2.Write(salt)
+	h2.Write(sum1)
+	sum2 := h2.Sum(nil)
+
+	a := adler32.New()
+	a.Write(nil)
+	a.Write(sum2)
+	a.Write(data)
+
+	return a.Sum32()
+}
+
+func GenUUID() string {
+
+	randomData := make([]byte, 0x100)
+	io.ReadFull(rand.Reader, randomData)
+
+	h := md5.New()
+	h.Write(randomData)
+
+	nanoTime := time.Now().UnixNano()
+	secTime := time.Now().Unix()
+
+	h.Write([]byte(fmt.Sprintf("%v_%v", secTime, nanoTime)))
+	sum := h.Sum(nil)
+
+	return fmt.Sprintf("%x-%x-%x-%x-%x", sum[:4], sum[4:6], sum[6:8], sum[8:10], sum[10:])
+}