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Asp.Net 加密解密
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原文链接：http://www.cnblogs.com/toddzhang/p/3376117.html
#region DES加密解密
///<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>
publicstring DESEncrypt(string strSource)
{
return DESEncrypt(strSource, DESKey);
}
publicstring 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>
publicstring DESDecrypt(string strSource)
{
return DESDecrypt(strSource, DESKey);
}
publicstring 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();
}
#endregion
#region 一个用hash实现的加密解密方法
///<summary>
/// 加密
///</summary>
///<param name="src"></param>
///<returns></returns>
publicstaticstring EncryptStrByHash(string src)
{
if (src.Length ==0)
{
return"";
}
byte[] HaKey = System.Text.Encoding.ASCII.GetBytes((src +"Test").ToCharArray());
byte[] HaData =newbyte[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>
publicstaticstring 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 =newbyte[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>
/// 对加密后的密文重新编码,如果密文长>16,则去掉前16个字符,如果长度小于16,返回空字符串
///</summary>
///<param name="s"></param>
///<returns></returns>
publicstring ReEncryptStrByHash(string s)
{
string e = Encrypt.EncryptStrByHash(s);
return ((e.Length >16) ? e.Substring(16) : "");
}
#endregion
#region Md5加密,生成16位或32位,生成的密文都是大写
publicstaticstring Md5To16(string str)
{
MD5CryptoServiceProvider md5 =new MD5CryptoServiceProvider();
string t2 = BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(str)), 4, 8);
t2 = t2.Replace("-", "");
return t2;
}
//// <summary>
/// MD5 32位加密
///</summary>
///<param name="str"></param>
///<returns></returns>
publicstaticstring 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("X");
}
return pwd;
}
#endregion
#region 3DES加密解密
publicstring Encrypt3DES(string str)
{
//密钥
string sKey ="wyw308";
// //矢量,可为空
string sIV ="scf521";
// //构造对称算法
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>
/// 带指定密钥和矢量的3DES加密
///</summary>
///<param name="str"></param>
///<param name="sKey"></param>
///<param name="sIV"></param>
///<returns></returns>
publicstring 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());
}
//解密
publicstring 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>
/// 带指定密钥和矢量的3DES解密
///</summary>
///<param name="Value"></param>
///<param name="sKey"></param>
///<param name="sIV"></param>
///<returns></returns>
publicstring 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());
}
#endregion
#region 一个简单的加密解密方法,只支持英文
publicstaticstring EnCryptEnStr(string str) //倒序加1加密
{
byte[] by =newbyte[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;
}
publicstaticstring DeCryptEnStr(string str) //顺序减1解码
{
byte[] by =newbyte[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;
}
#endregion
#region 一个简单的加密解密方法,在上一个的基础上支持中文
publicstaticstring 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;
}
publicstaticstring DeCryptCnStr(string str)
{
string dtext ="";
for (int i =0; i < str.Length; i++)
{
dtext = dtext + (char)(str[i] -10+1*2);
}
return dtext;
}
#endregion
#region Url地址编码解码
///<summary>
/// 编码Url地址
///</summary>
///<param name="url"></param>
///<returns></returns>
publicstaticstring UrlEncode(string url)
{
byte[] mByte =null;
mByte = System.Text.Encoding.GetEncoding("GB2312").GetBytes(url);
return System.Web.HttpUtility.UrlEncode(mByte);
}
///<summary>
/// 解码Url地址
///</summary>
///<param name="url"></param>
///<returns></returns>
publicstaticstring UrlDecode(string url)
{
return HttpUtility.UrlDecode(url, System.Text.Encoding.GetEncoding("GB2312"));
}
#endregion
转载于:https://www.cnblogs.com/toddzhang/p/3376117.html
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