init

common.go

@@ -0,0 +1,101 @@
+package main
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"fmt"
+	"net"
+)
+
+func getmac(ip string) string {
+	//get mac relative to the ip address which connected to the mq.
+	ifaces, err := net.Interfaces()
+	if err != nil {
+		return ""
+	}
+	firstMac := ""
+	for _, iface := range ifaces {
+		addrs, _ := iface.Addrs()
+		for _, addr := range addrs {
+			if firstMac == "" {
+				firstMac = iface.HardwareAddr.String()
+			}
+			if ipNet, ok := addr.(*net.IPNet); ok && ipNet.IP.String() == ip {
+				if iface.HardwareAddr.String() != "" {
+					return iface.HardwareAddr.String()
+				}
+				return firstMac
+			}
+		}
+	}
+	return firstMac
+}
+
+var cbcIVBlock = []byte("UHNJUSBACIJFYSQN")
+
+var paddingArray = [][]byte{
+	{0},
+	{1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1},
+	{2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2},
+	{3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3},
+	{4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4},
+	{5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5},
+	{6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6},
+	{7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7},
+	{8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8},
+	{9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9},
+	{10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10},
+	{11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11},
+	{12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12},
+	{13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13},
+	{14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14},
+	{15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15},
+	{16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16},
+}
+
+func pkcs7Padding(plainData []byte, dataLen, blockSize int) int {
+	padLen := blockSize - dataLen%blockSize
+	pPadding := plainData[dataLen : dataLen+padLen]
+
+	copy(pPadding, paddingArray[padLen][:padLen])
+	return padLen
+}
+
+func pkcs7UnPadding(origData []byte, dataLen int) ([]byte, error) {
+	unPadLen := int(origData[dataLen-1])
+	if unPadLen <= 0 || unPadLen > 16 {
+		return nil, fmt.Errorf("wrong pkcs7 padding head size:%d", unPadLen)
+	}
+	return origData[:(dataLen - unPadLen)], nil
+}
+
+func encryptBytes(key []byte, out, in []byte, plainLen int) ([]byte, error) {
+	if len(key) == 0 {
+		return in[:plainLen], nil
+	}
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+	//iv := out[:aes.BlockSize]
+	//if _, err := io.ReadFull(rand.Reader, iv); err != nil {
+	//	return nil, err
+	//}
+	mode := cipher.NewCBCEncrypter(block, cbcIVBlock)
+	total := pkcs7Padding(in, plainLen, aes.BlockSize) + plainLen
+	mode.CryptBlocks(out[:total], in[:total])
+	return out[:total], nil
+}
+
+func decryptBytes(key []byte, out, in []byte, dataLen int) ([]byte, error) {
+	if len(key) == 0 {
+		return in[:dataLen], nil
+	}
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+	mode := cipher.NewCBCDecrypter(block, cbcIVBlock)
+	mode.CryptBlocks(out[:dataLen], in[:dataLen])
+	return pkcs7UnPadding(out, dataLen)
+}