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235 lines
8.2 KiB
C#

12 months ago
using System.Net;
using System.Security.Cryptography;
using System.Text;
namespace Ds.Module.WeChat.Utilities
{
public class Cryptography
{
public static UInt32 HostToNetworkOrder(UInt32 inval)
{
UInt32 outval = 0;
for (int i = 0; i < 4; i++)
outval = (outval << 8) + ((inval >> (i * 8)) & 255);
return outval;
}
public static Int32 HostToNetworkOrder(Int32 inval)
{
Int32 outval = 0;
for (int i = 0; i < 4; i++)
outval = (outval << 8) + ((inval >> (i * 8)) & 255);
return outval;
}
/// <summary>
/// 解密方法
/// </summary>
/// <param name="Input">密文</param>
/// <param name="EncodingAESKey"></param>
/// <returns></returns>
///
public static string AES_decrypt(String Input, string EncodingAESKey, ref string appid)
{
byte[] Key;
Key = Convert.FromBase64String(EncodingAESKey + "=");
byte[] Iv = new byte[16];
Array.Copy(Key, Iv, 16);
byte[] btmpMsg = AES_decrypt(Input, Iv, Key);
int len = BitConverter.ToInt32(btmpMsg, 16);
len = IPAddress.NetworkToHostOrder(len);
byte[] bMsg = new byte[len];
byte[] bAppid = new byte[btmpMsg.Length - 20 - len];
Array.Copy(btmpMsg, 20, bMsg, 0, len);
Array.Copy(btmpMsg, 20 + len, bAppid, 0, btmpMsg.Length - 20 - len);
string oriMsg = Encoding.UTF8.GetString(bMsg);
appid = Encoding.UTF8.GetString(bAppid);
return oriMsg;
}
public static String AES_encrypt(String Input, string EncodingAESKey, string appid)
{
byte[] Key;
Key = Convert.FromBase64String(EncodingAESKey + "=");
byte[] Iv = new byte[16];
Array.Copy(Key, Iv, 16);
string Randcode = CreateRandCode(16);
byte[] bRand = Encoding.UTF8.GetBytes(Randcode);
byte[] bAppid = Encoding.UTF8.GetBytes(appid);
byte[] btmpMsg = Encoding.UTF8.GetBytes(Input);
byte[] bMsgLen = BitConverter.GetBytes(HostToNetworkOrder(btmpMsg.Length));
byte[] bMsg = new byte[bRand.Length + bMsgLen.Length + bAppid.Length + btmpMsg.Length];
Array.Copy(bRand, bMsg, bRand.Length);
Array.Copy(bMsgLen, 0, bMsg, bRand.Length, bMsgLen.Length);
Array.Copy(btmpMsg, 0, bMsg, bRand.Length + bMsgLen.Length, btmpMsg.Length);
Array.Copy(bAppid, 0, bMsg, bRand.Length + bMsgLen.Length + btmpMsg.Length, bAppid.Length);
return AES_encrypt(bMsg, Iv, Key);
}
private static string CreateRandCode(int codeLen)
{
string codeSerial = "2,3,4,5,6,7,a,c,d,e,f,h,i,j,k,m,n,p,r,s,t,A,C,D,E,F,G,H,J,K,M,N,P,Q,R,S,U,V,W,X,Y,Z";
if (codeLen == 0)
{
codeLen = 16;
}
string[] arr = codeSerial.Split(',');
string code = "";
int randValue = -1;
Random rand = new Random(unchecked((int)DateTime.Now.Ticks));
for (int i = 0; i < codeLen; i++)
{
randValue = rand.Next(0, arr.Length - 1);
code += arr[randValue];
}
return code;
}
private static String AES_encrypt(String Input, byte[] Iv, byte[] Key)
{
var aes = new RijndaelManaged();
//秘钥的大小,以位为单位
aes.KeySize = 256;
//支持的块大小
aes.BlockSize = 128;
//填充模式
aes.Padding = PaddingMode.PKCS7;
aes.Mode = CipherMode.CBC;
aes.Key = Key;
aes.IV = Iv;
var encrypt = aes.CreateEncryptor(aes.Key, aes.IV);
byte[] xBuff = null;
using (var ms = new MemoryStream())
{
using (var cs = new CryptoStream(ms, encrypt, CryptoStreamMode.Write))
{
byte[] xXml = Encoding.UTF8.GetBytes(Input);
cs.Write(xXml, 0, xXml.Length);
}
xBuff = ms.ToArray();
}
String Output = Convert.ToBase64String(xBuff);
return Output;
}
private static String AES_encrypt(byte[] Input, byte[] Iv, byte[] Key)
{
var aes = new RijndaelManaged();
//秘钥的大小,以位为单位
aes.KeySize = 256;
//支持的块大小
aes.BlockSize = 128;
//填充模式
//aes.Padding = PaddingMode.PKCS7;
aes.Padding = PaddingMode.None;
aes.Mode = CipherMode.CBC;
aes.Key = Key;
aes.IV = Iv;
var encrypt = aes.CreateEncryptor(aes.Key, aes.IV);
byte[] xBuff = null;
#region 自己进行PKCS7补位用系统自己带的不行
byte[] msg = new byte[Input.Length + 32 - Input.Length % 32];
Array.Copy(Input, msg, Input.Length);
byte[] pad = KCS7Encoder(Input.Length);
Array.Copy(pad, 0, msg, Input.Length, pad.Length);
#endregion 自己进行PKCS7补位用系统自己带的不行
#region 注释的也是一种方法,效果一样
//ICryptoTransform transform = aes.CreateEncryptor();
//byte[] xBuff = transform.TransformFinalBlock(msg, 0, msg.Length);
#endregion 注释的也是一种方法,效果一样
using (var ms = new MemoryStream())
{
using (var cs = new CryptoStream(ms, encrypt, CryptoStreamMode.Write))
{
cs.Write(msg, 0, msg.Length);
}
xBuff = ms.ToArray();
}
String Output = Convert.ToBase64String(xBuff);
return Output;
}
private static byte[] KCS7Encoder(int text_length)
{
int block_size = 32;
// 计算需要填充的位数
int amount_to_pad = block_size - (text_length % block_size);
if (amount_to_pad == 0)
{
amount_to_pad = block_size;
}
// 获得补位所用的字符
char pad_chr = chr(amount_to_pad);
string tmp = "";
for (int index = 0; index < amount_to_pad; index++)
{
tmp += pad_chr;
}
return Encoding.UTF8.GetBytes(tmp);
}
/**
* ASCII
*
* @param a
* @return
*/
private static char chr(int a)
{
byte target = (byte)(a & 0xFF);
return (char)target;
}
private static byte[] AES_decrypt(String Input, byte[] Iv, byte[] Key)
{
RijndaelManaged aes = new RijndaelManaged();
aes.KeySize = 256;
aes.BlockSize = 128;
aes.Mode = CipherMode.CBC;
aes.Padding = PaddingMode.None;
aes.Key = Key;
aes.IV = Iv;
var decrypt = aes.CreateDecryptor(aes.Key, aes.IV);
byte[] xBuff = null;
using (var ms = new MemoryStream())
{
using (var cs = new CryptoStream(ms, decrypt, CryptoStreamMode.Write))
{
byte[] xXml = Convert.FromBase64String(Input);
byte[] msg = new byte[xXml.Length + 32 - xXml.Length % 32];
Array.Copy(xXml, msg, xXml.Length);
cs.Write(xXml, 0, xXml.Length);
}
xBuff = decode2(ms.ToArray());
}
return xBuff;
}
private static byte[] decode2(byte[] decrypted)
{
int pad = (int)decrypted[decrypted.Length - 1];
if (pad < 1 || pad > 32)
{
pad = 0;
}
byte[] res = new byte[decrypted.Length - pad];
Array.Copy(decrypted, 0, res, 0, decrypted.Length - pad);
return res;
}
}
}