first commit

utils/utils.go

@@ -0,0 +1,54 @@
+package utils
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"encoding/base64"
+	"net/http"
+
+	"github.com/julienschmidt/httprouter"
+)
+
+func AdaptHandler(h func(http.ResponseWriter, *http.Request)) httprouter.Handle {
+	return func(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
+		h(w, r)
+	}
+}
+
+func AesDecrypt(encryptedData, sessionKey, iv string) ([]byte, error) {
+	//Base64解码
+	keyBytes, err := base64.StdEncoding.DecodeString(sessionKey)
+	if err != nil {
+		return nil, err
+	}
+	ivBytes, err := base64.StdEncoding.DecodeString(iv)
+	if err != nil {
+		return nil, err
+	}
+	cryptData, err := base64.StdEncoding.DecodeString(encryptedData)
+	if err != nil {
+		return nil, err
+	}
+	origData := make([]byte, len(cryptData))
+	//AES
+	block, err := aes.NewCipher(keyBytes)
+	if err != nil {
+		return nil, err
+	}
+	//CBC
+	mode := cipher.NewCBCDecrypter(block, ivBytes)
+	//解密
+	mode.CryptBlocks(origData, cryptData)
+	//去除填充位
+	origData = PKCS7UnPadding(origData)
+	return origData, nil
+}
+
+func PKCS7UnPadding(plantText []byte) []byte {
+	length := len(plantText)
+	if length > 0 {
+		unPadding := int(plantText[length-1])
+		return plantText[:(length - unPadding)]
+	}
+	return plantText
+}