C#加密解密類：DES、3DES、MD5
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using System;
using System.Security.Cryptography; using System.IO; using System.Data; using System.Web; using System.Text; using System.Security; namespace CMIS.Common { /// <summary> /// 加密解密 /// </summary> public class Encrypt { /// <summary> /// DES密鑰 /// </summary> public static byte[] DESKey = new byte[] {0x52, 0xBC, 0xA1, 0x6A, 0xD5, 0x87, 0x3B, 0xE6, 0x82, 0x7A, 0x2A, 0x64, 0x3A, 0x7F, 0x32, 0xBB, 0x1B, 0x67, 0xE2, 0x5E, 0x06, 0x19, 0xB9, 0x2D, 0x68, 0xB3, 0x4F, 0xFB, 0xBF, 0xDD, 0x55 ,0xB8 }; /// <summary> /// DES加密 /// </summary> /// <param name="strSource">待加密字串</param> /// <param name="key">32位Key值</param> /// <returns>加密后的字符串</returns> public static string DESEncrypt(string strSource) { return DESEncrypt(strSource, DESKey); } public static string DESEncrypt(string strSource,byte[] key) { SymmetricAlgorithm sa = Rijndael.Create(); sa.Key = key; sa.Mode= CipherMode.ECB; sa.Padding = PaddingMode.Zeros; MemoryStream 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()); } /// <summary> /// DES解密 /// </summary> /// <param name="strSource">待解密的字串</param> /// <param name="key">32位Key值</param> /// <returns>解密后的字符串</returns> public static string DESDecrypt(string strSource) { return DESDecrypt(strSource, DESKey); } public static string DESDecrypt(string strSource,byte[] key) { SymmetricAlgorithm sa = Rijndael.Create(); sa.Key = key; sa.Mode = CipherMode.ECB; sa.Padding = PaddingMode.Zeros; ICryptoTransform ct = sa.CreateDecryptor(); byte[] byt = Convert.FromBase64String(strSource); MemoryStream ms = new MemoryStream(byt); CryptoStream cs = new CryptoStream(ms, ct, CryptoStreamMode.Read); StreamReader sr = new StreamReader(cs, Encoding.Unicode); return sr.ReadToEnd(); } /// <summary> /// 加密 /// </summary> /// <param name="src"></param> /// <returns></returns> public static string EncryptStrByHash(string src) { if (src.Length==0) { return ""; } byte[] HaKey=System.Text.Encoding.ASCII.GetBytes((src+"Test").ToCharArray()); byte[] HaData=new byte[20]; 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.GetBytes(HaResult.ToCharArray()); byte[] RiDataBuf = System.Text.Encoding.ASCII.GetBytes(src.ToCharArray()); byte[] EncodedBytes = {}; MemoryStream ms = new MemoryStream(); RijndaelManaged rv = new RijndaelManaged(); cs = new CryptoStream(ms, rv.CreateEncryptor(RiKey, RiKey), CryptoStreamMode.Write); try { cs.Write(RiDataBuf, 0, RiDataBuf.Length); cs.FlushFinalBlock(); EncodedBytes = ms.ToArray(); } finally { ms.Close(); cs.Close(); } return HaResult+System.Convert.ToBase64String(EncodedBytes); } /// <summary> /// 解密 /// </summary> /// <param name="src"></param> /// <returns></returns> 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.GetBytes(src.Substring(0,16).ToCharArray()); byte[] InitialText = new byte[SrcBytes.Length]; RijndaelManaged rv = new RijndaelManaged(); MemoryStream ms = new MemoryStream(SrcBytes); CryptoStream cs = new CryptoStream(ms, rv.CreateDecryptor(RiKey, RiKey), CryptoStreamMode.Read); try { cs.Read(InitialText, 0, InitialText.Length); } finally { ms.Close(); cs.Close(); } System.Text.StringBuilder Result = new System.Text.StringBuilder(); for(int i=0; i < InitialText.Length; ++i) if (InitialText[i]>0) Result.Append((char) InitialText[i]); return Result.ToString(); } /// <summary> /// 對加密后的密文重新編碼,如果密文長>16,則去掉前16個字符,如果長度小于16,返回空字符串 /// </summary> /// <param name="s"></param> /// <returns></returns> public static string ReEncryptStrByHash(string s) { //string e= (new Encrypt()).EncryptStrByHash(s); string e= EncryptStrByHash(s); return ((e.Length>16)?e.Substring(16):""); } /// <summary> /// MD5 16位加密 /// </summary> /// <param name="str"></param> /// <returns></returns> public static string Md5To16(string str) { MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider(); string pwd = BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(str)), 4, 8); pwd = pwd.Replace("-", ""); return pwd; } /// <summary> /// MD5 32位加密 /// </summary> /// <param name="str"></param> /// <returns></returns> public static string Md5To32(string str) { string pwd = ""; MD5 md5 = MD5.Create(); byte[] s = md5.ComputeHash(Encoding.UTF8.GetBytes(str)); for (int i = 0; i < s.Length; i++){ pwd = pwd + s[i].ToString("X2"); } return pwd; } /// <summary> /// 3DES加密 /// </summary> /// <param name="str"></param> /// <returns></returns> public static string Encrypt3DES(string str) { //密鑰 string sKey = "wyw308"; // //矢量,可為空 string sIV = "scf521"; // //構造對稱算法 SymmetricAlgorithm mCSP = new TripleDESCryptoServiceProvider(); ICryptoTransform ct; MemoryStream ms; CryptoStream cs; byte[] byt; mCSP.Key = Convert.FromBase64String(sKey); mCSP.IV = Convert.FromBase64String(sIV); mCSP.Mode = System.Security.Cryptography.CipherMode.ECB; mCSP.Padding = System.Security.Cryptography.PaddingMode.PKCS7; ct = mCSP.CreateEncryptor(mCSP.Key, mCSP.IV); byt = Encoding.UTF8.GetBytes(str); ms = new MemoryStream(); cs = new CryptoStream(ms, ct, CryptoStreamMode.Write); cs.Write(byt, 0, byt.Length); cs.FlushFinalBlock(); cs.Close(); return Convert.ToBase64String(ms.ToArray()); } /// <summary> /// 帶指定密鑰和矢量的3DES加密 /// </summary> /// <param name="str"></param> /// <param name="sKey"></param> /// <param name="sIV"></param> /// <returns></returns> public static string Encrypt3DES(string str,string sKey,string sIV) { SymmetricAlgorithm mCSP = new TripleDESCryptoServiceProvider(); ICryptoTransform ct; MemoryStream ms; CryptoStream cs; byte[] byt; mCSP.Key = Convert.FromBase64String(sKey); mCSP.IV = Convert.FromBase64String(sIV); mCSP.Mode = System.Security.Cryptography.CipherMode.ECB; mCSP.Padding = System.Security.Cryptography.PaddingMode.PKCS7; ct = mCSP.CreateEncryptor(mCSP.Key, mCSP.IV); byt = Encoding.UTF8.GetBytes(str); ms = new MemoryStream(); cs = new CryptoStream(ms, ct, CryptoStreamMode.Write); cs.Write(byt, 0, byt.Length); cs.FlushFinalBlock(); cs.Close(); return Convert.ToBase64String(ms.ToArray()); } /// <summary> /// 3DES解密 /// </summary> /// <param name="Value"></param> /// <returns></returns> public static string Decrypt3DES(string Value) { string sKey = "wyw308"; string sIV = "scf521"; SymmetricAlgorithm mCSP = new TripleDESCryptoServiceProvider(); ICryptoTransform ct; MemoryStream ms; CryptoStream cs; byte[] byt; mCSP.Key = Convert.FromBase64String(sKey); mCSP.IV = Convert.FromBase64String(sIV); mCSP.Mode = System.Security.Cryptography.CipherMode.ECB; mCSP.Padding = System.Security.Cryptography.PaddingMode.PKCS7; ct = mCSP.CreateDecryptor(mCSP.Key, mCSP.IV); byt = Convert.FromBase64String(Value); ms = new MemoryStream(); cs = new CryptoStream(ms, ct, CryptoStreamMode.Write); cs.Write(byt, 0, byt.Length); cs.FlushFinalBlock(); cs.Close(); return Encoding.UTF8.GetString(ms.ToArray()); } /// <summary> /// 帶指定密鑰和矢量的3DES解密 /// </summary> /// <param name="Value"></param> /// <param name="sKey"></param> /// <param name="sIV"></param> /// <returns></returns> public static string Decrypt3DES(string str,string sKey,string sIV) { SymmetricAlgorithm mCSP = new TripleDESCryptoServiceProvider(); ICryptoTransform ct; MemoryStream ms; CryptoStream cs; byte[] byt; mCSP.Key = Convert.FromBase64String(sKey); mCSP.IV = Convert.FromBase64String(sIV); mCSP.Mode = System.Security.Cryptography.CipherMode.ECB; mCSP.Padding = System.Security.Cryptography.PaddingMode.PKCS7; ct = mCSP.CreateDecryptor(mCSP.Key, mCSP.IV); byt = Convert.FromBase64String(str); ms = new MemoryStream(); cs = new CryptoStream(ms, ct, CryptoStreamMode.Write); cs.Write(byt, 0, byt.Length); cs.FlushFinalBlock(); cs.Close(); return Encoding.UTF8.GetString(ms.ToArray()); } public static string EnCryptEnStr( string str ) //倒序加1加密 { byte[] by=new byte[str.Length]; for( int i=0; i<=str.Length-1; i++ ) { by[i]=( byte )( ( byte )str[i]+1 ); } str=""; for( int i=by.Length-1; i>=0; i-- ) { str+=( ( char )by[i] ).ToString( ); } return str; } public static string DeCryptEnStr( string str ) //順序減1解碼 { byte[] by=new byte[str.Length]; for( int i=0; i<=str.Length-1; i++ ) { by[i]=( byte )( ( byte )str[i]-1 ); } str=""; for( int i=by.Length-1; i>=0; i-- ) { str+=( ( char )by[i] ).ToString( ); } return str; } public static string EnCryptCnStr(string str) { string htext = ""; // blank text for ( int i = 0; i < str.Length; i++) { htext = htext + (char) (str[i] + 10 - 1 * 2); } return htext; } public static string DeCryptCnStr(string str) { string dtext = ""; for ( int i=0; i < str.Length; i++) { dtext = dtext + (char) (str[i] - 10 + 1*2); } return dtext; } /// <summary> /// Discuz論壇Md5加密 /// </summary> /// <param name="str"></param> /// <returns></returns> public static string Md5(string str) { MD5 md5Hasher = MD5.Create(); string re=""; byte[] data = md5Hasher.ComputeHash(Encoding.UTF8.GetBytes(str+"%$#@!"));//yc for (int i = 0; i < data.Length; i++){ re += data[i].ToString("x2"); } return re; } } } 該文章在 2021/1/30 11:57:45 編輯過 |
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