MD5加密一般不可逆，只能暴力突破。所以这边记录一下一些关于字符串的加解密的两种方法，以便自己学习
AES
public class AESHelper { public static string AESEncrypt(string text) { return AESEnc(text, KeyStruct.strKey); } public static string AESDecrypt(string text) { return AESDes(text, KeyStruct.strKey); } //加密 private static string AESEnc(string text, string mkey) { using (RijndaelManaged rijndael = new RijndaelManaged()) { rijndael.Mode = CipherMode.ECB; rijndael.Padding = PaddingMode.PKCS7; rijndael.KeySize = 128; rijndael.BlockSize = 128; byte[] pwdBytes = Encoding.Default.GetBytes(mkey); byte[] keyBytes = new byte[16]; int len = pwdBytes.Length > keyBytes.Length ? keyBytes.Length : pwdBytes.Length; Array.Copy(pwdBytes, keyBytes, len); rijndael.Key = keyBytes; using (ICryptoTransform tranform = rijndael.CreateEncryptor()) { byte[] txtBytes = Encoding.Default.GetBytes(text); return Convert.ToBase64String(tranform.TransformFinalBlock(txtBytes, 0, txtBytes.Length)); } } } //解密 private static string AESDes(string text, string key) { using (RijndaelManaged rijndael = new RijndaelManaged()) { rijndael.Mode = CipherMode.ECB; rijndael.Padding = PaddingMode.PKCS7; rijndael.KeySize = 128; rijndael.BlockSize = 128; byte[] encryptedData = Convert.FromBase64String(text); byte[] pwdBytes = Encoding.Default.GetBytes(key); byte[] keyBytes = new byte[16]; int len = pwdBytes.Length > keyBytes.Length ? keyBytes.Length : pwdBytes.Length; Array.Copy(pwdBytes, keyBytes, len); rijndael.Key = keyBytes; using (ICryptoTransform tranform = rijndael.CreateDecryptor()) { var a = tranform.TransformFinalBlock(encryptedData, 0, encryptedData.Length); return Encoding.Default.GetString(a); } } } private struct KeyStruct { public static string strKey = "****"; } }
DES
public class DesHelper { private static string desKey = "****"; public static string DesEncrypt(string text) { return DesEnc(text, desKey); } public static string DesDescript(string text) { return DesDes(text, desKey); } private static string DesEnc(string text, string dkey) { using (DESCryptoServiceProvider descry = new DESCryptoServiceProvider()) { byte[] txtBytes = Encoding.Default.GetBytes(text); byte[] keyBytes =ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication. HashPasswordForStoringInConfigFile(dkey, "MD5").Substring(0, 8)); descry.Key = keyBytes; descry.IV = keyBytes; //获取或设置对称算法的初始化向量,这边默认向量为key using (MemoryStream ms = new MemoryStream()) { using (CryptoStream cs = new CryptoStream(ms, descry.CreateEncryptor(), CryptoStreamMode.Write)) { cs.Write(txtBytes, 0, txtBytes.Length); cs.FlushFinalBlock(); } //StringBuilder ret = new StringBuilder(); //foreach (byte b in ms.ToArray()) //{ // ret.AppendFormat("{0:X2}", b); //} return Convert.ToBase64String(ms.ToArray()); } } } private static string DesDes(string text, string dkey) { try { using (DESCryptoServiceProvider des = new DESCryptoServiceProvider()) { byte[] txtBytes = Convert.FromBase64String(text); des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication. HashPasswordForStoringInConfigFile(dkey, "MD5").Substring(0, 8)); des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication. HashPasswordForStoringInConfigFile(dkey, "MD5").Substring(0, 8)); using (MemoryStream ms = new MemoryStream()) { using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write)) { cs.Write(txtBytes, 0, txtBytes.Length); cs.FlushFinalBlock(); return Encoding.Default.GetString(ms.ToArray()); } } } } catch (Exception ex) { throw ex; } } }