/** * 用于加密,解密,(包含MD5加密和base64加密/解密)以及GUID的生成 * 时间: * zhifieya */package safeimport (    "crypto/md5"    "crypto/rand"    "crypto/sha1"    "encoding/base64"    "encoding/hex"    "io"    "strings")const (    //BASE64字符表,不要有重复    base64Table        = "<>:;‘,./?~!@#$CDVWX%^&*ABYZabcghijklmnopqrstuvwxyz01EFGHIJKLMNOPQRSTU2345678(def)_+|{}[]9/"    hashFunctionHeader = "zh.ife.iya"    hashFunctionFooter = "09.O25.O20.78")/** * 对一个字符串进行MD5加密,不可解密 */func GetMd5String(s string) string {    h := md5.New()    h.Write([]byte(s)) //使用zhifeiya名字做散列值，设定后不要变    return hex.EncodeToString(h.Sum(nil))}/*获取 SHA1 字符串*/func GetSHA1String(s string) string {    t := sha1.New()    t.Write([]byte(s))    return hex.EncodeToString(t.Sum(nil))}/** * 获取一个Guid值 */func GetGuid() string {    b := make([]byte, 48)    if _, err := io.ReadFull(rand.Reader, b); err != nil {        return ""    }    return GetMd5String(base64.URLEncoding.EncodeToString(b))}var coder = base64.NewEncoding(base64Table)/** * base64加密 */func Base64Encode(str string) string {    var src []byte = []byte(hashFunctionHeader + str + hashFunctionFooter)    return string([]byte(coder.EncodeToString(src)))}/** * base64解密 */func Base64Decode(str string) (string, error) {    var src []byte = []byte(str)    by, err := coder.DecodeString(string(src))    return strings.Replace(strings.Replace(string(by), hashFunctionHeader, "", -1), hashFunctionFooter, "", -1), err}