using System.Security.Cryptography;
using System.Text;

namespace SBF.Common.Extensions
{
    public static class EncryptionExtension
    {

        public static string Md5Encrypt(this string originStr)
        {
            using (var md5 = MD5.Create())
            {
                return string.Join(string.Empty, md5.ComputeHash(Encoding.UTF8.GetBytes(originStr)).Select(x => x.ToString("x2")));
            }
        }

        //AES加密  传入,要加密的串和, 解密key
        public static string AESEncrypt(this string input)
        {
            var key = "dataplatform2019";
            var ivStr = "1012132405963708";

            var encryptKey = Encoding.UTF8.GetBytes(key);
            var iv = Encoding.UTF8.GetBytes(ivStr); //偏移量,最小为16
            using (var aesAlg = Aes.Create())
            {
                using (var encryptor = aesAlg.CreateEncryptor(encryptKey, iv))
                {
                    using (var msEncrypt = new MemoryStream())
                    {
                        using (var csEncrypt = new CryptoStream(msEncrypt, encryptor,
                            CryptoStreamMode.Write))

                        using (var swEncrypt = new StreamWriter(csEncrypt))
                        {
                            swEncrypt.Write(input);
                        }
                        var decryptedContent = msEncrypt.ToArray();

                        return Convert.ToBase64String(decryptedContent);
                    }
                }
            }
        }

        public static string AESDecrypt(this string cipherText)
        {
            var fullCipher = Convert.FromBase64String(cipherText);

            var ivStr = "1012132405963708";
            var key = "dataplatform2019";

            var iv = Encoding.UTF8.GetBytes(ivStr);
            var decryptKey = Encoding.UTF8.GetBytes(key);

            using (var aesAlg = Aes.Create())
            {
                using (var decryptor = aesAlg.CreateDecryptor(decryptKey, iv))
                {
                    string result;
                    using (var msDecrypt = new MemoryStream(fullCipher))
                    {
                        using (var csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
                        {
                            using (var srDecrypt = new StreamReader(csDecrypt))
                            {
                                result = srDecrypt.ReadToEnd();
                            }
                        }
                    }

                    return result;
                }
            }
        }

        public static string Base64Encrypt(this string originStr)
        {
            return Convert.ToBase64String(Encoding.UTF8.GetBytes(originStr));
        }
    }
}