加密解密常用函数Word下载.docx

1、/summaryparam name=strSource待加密字串key32位Key值加密后的字符串public string DESEncrypt（string strSource）return DESEncrypt（strSource, DESKey）;public string DESEncrypt（string strSource, byte key）SymmetricAlgorithm sa = Rijndael.Create（）;sa.Key = key;sa.Mode = CipherMode.ECB;sa.Padding = PaddingMode.Zeros;MemorySt

2、ream ms = new MemoryStream（）;CryptoStream cs = new CryptoStream（ms, sa.CreateEncryptor（）, CryptoStreamMode.Write）;byte byt = Encoding.Unicode.GetBytes（strSource）;cs.Write（byt, 0, byt.Length）;cs.FlushFinalBlock（）;cs.Close（）;return Convert.ToBase64String（ms.ToArray（）;/ DES解密待解密的字串解密后的字符串public string

3、DESDecrypt（string strSource）return DESDecrypt（strSource, DESKey）;public string DESDecrypt（string strSource, byte key）ICryptoTransform ct = sa.CreateDecryptor（）;byte byt = Convert.FromBase64String（strSource）;MemoryStream ms = new MemoryStream（byt）;CryptoStream cs = new CryptoStream（ms, ct, CryptoStre

4、amMode.Read）;StreamReader sr = new StreamReader（cs, Encoding.Unicode）;return sr.ReadToEnd（）;#endregion#region 一个用hash实现的加密解密方法/ 加密srcpublic static string EncryptStrByHash（string src）if （src.Length = 0） return ;byte HaKey = System.Text.Encoding.ASCII.GetBytes（src + Test）.ToCharArray（）;byte HaData = n

5、ew byte20;HMACSHA1 Hmac = new HMACSHA1（HaKey）;CryptoStream cs = new CryptoStream（Stream.Null, Hmac, CryptoStreamMode.Write）;try cs.Write（HaData, 0, HaData.Length）;finally cs.Close（）;string HaResult = System.Convert.ToBase64String（Hmac.Hash）.Substring（0, 16）;byte RiKey = System.Text.Encoding.ASCII.Ge

6、tBytes（HaResult.ToCharArray（）;byte RiDataBuf = System.Text.Encoding.ASCII.GetBytes（src.ToCharArray（）;byte EncodedBytes = ;RijndaelManaged rv = new RijndaelManaged（）;cs = new CryptoStream（ms, rv.CreateEncryptor（RiKey, RiKey）, CryptoStreamMode.Write）; cs.Write（RiDataBuf, 0, RiDataBuf.Length）; cs.Flush

7、FinalBlock（）; EncodedBytes = ms.ToArray（）; ms.Close（）;return HaResult + System.Convert.ToBase64String（EncodedBytes）;/ 解密public static string DecrypStrByHash（string src）if （src.Length 40） return byte SrcBytes = System.Convert.FromBase64String（src.Substring（16）;byte RiKey = System.Text.Encoding.ASCII.

8、GetBytes（src.Substring（0, 16）.ToCharArray（）;byte InitialText = new byteSrcBytes.Length;MemoryStream ms = new MemoryStream（SrcBytes）;CryptoStream cs = new CryptoStream（ms, rv.CreateDecryptor（RiKey, RiKey）, CryptoStreamMode.Read）; cs.Read（InitialText, 0, InitialText.Length）;System.Text.StringBuilder Result = new System.Text.StringBuilder（）;for （int i = 0; i 16,则去掉前16个字符,如果长度小于16,返回空字符串para