/**
* 密文解密
* @param msgSignature 签名串
* @param timeStamp 时间戳
* @param nonce 随机串
* @param encryptMsg 密文
* @return 解密后的原文
* @throws DingTalkEncryptException
*/
public String getDecryptMsg(String msgSignature, String timeStamp, String nonce, String encryptMsg)
{
//校验签名
String signature = getSignature(token, timeStamp, nonce, encryptMsg);
LogHelper.AddLog2(51, signature + "/" + msgSignature, null);
if (!signature.Equals(msgSignature))
{
throw new DingTalkEncryptException(DingTalkEncryptException.COMPUTE_SIGNATURE_ERROR);
}
// 解密
String result = decrypt(encryptMsg);
return(result);
}
/*
* 对明文加密.
* @param text 需要加密的明文
* @return 加密后base64编码的字符串
*/
private String encrypt(String random, String plaintext)
{
try
{
byte[] randomBytes = System.Text.Encoding.UTF8.GetBytes(random); // random.getBytes(CHARSET);
byte[] plainTextBytes = System.Text.Encoding.UTF8.GetBytes(plaintext); // plaintext.getBytes(CHARSET);
byte[] lengthByte = Utils.int2Bytes(plainTextBytes.Length);
byte[] corpidBytes = System.Text.Encoding.UTF8.GetBytes(corpId); // corpId.getBytes(CHARSET);
//MemoryStream byteStream = new MemoryStream();
var bytestmp = new List <byte>();
bytestmp.AddRange(randomBytes);
bytestmp.AddRange(lengthByte);
bytestmp.AddRange(plainTextBytes);
bytestmp.AddRange(corpidBytes);
byte[] padBytes = PKCS7Padding.getPaddingBytes(bytestmp.Count);
bytestmp.AddRange(padBytes);
byte[] unencrypted = bytestmp.ToArray();
RijndaelManaged rDel = new RijndaelManaged();
rDel.Mode = CipherMode.CBC;
rDel.Padding = PaddingMode.Zeros;
rDel.Key = aesKey;
rDel.IV = aesKey.ToList().Take(16).ToArray();
ICryptoTransform cTransform = rDel.CreateEncryptor();
byte[] resultArray = cTransform.TransformFinalBlock(unencrypted, 0, unencrypted.Length);
return(Convert.ToBase64String(resultArray, 0, resultArray.Length));
//Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
//SecretKeySpec keySpec = new SecretKeySpec(aesKey, "AES");
//IvParameterSpec iv = new IvParameterSpec(aesKey, 0, 16);
//cipher.init(Cipher.ENCRYPT_MODE, keySpec, iv);
//byte[] encrypted = cipher.doFinal(unencrypted);
//String result = base64.encodeToString(encrypted);
//return result;
}
catch (Exception e)
{
LogHelper.AddLog2(200, e.ToString(), null);
throw new DingTalkEncryptException(DingTalkEncryptException.COMPUTE_ENCRYPT_TEXT_ERROR);
}
}
/**
* 数字签名
* @param token isv token
* @param timestamp 时间戳
* @param nonce 随机串
* @param encrypt 加密文本
* @return
* @throws DingTalkEncryptException
*/
public String getSignature(String token, String timestamp, String nonce, String encrypt)
{
try
{
String[] array = new String[] { token, timestamp, nonce, encrypt };
LogHelper.AddLog2(551, string.Join(";", array), null);
//Arrays.sort(array);
var tmparray = array.ToList();
tmparray.Sort(new JavaStringComper());
array = tmparray.ToArray();
LogHelper.AddLog2(552, string.Join(";", array), null);
StringBuilder sb = new StringBuilder();
for (int i = 0; i < 4; i++)
{
sb.Append(array[i]);
}
String str = sb.ToString();
LogHelper.AddLog2(444, sb.ToString(), null);
//MessageDigest md = MessageDigest.getInstance("SHA-1");
//md.update(str.getBytes());
//byte[] digest = md.digest();
System.Security.Cryptography.SHA1 hash = System.Security.Cryptography.SHA1.Create();
System.Text.Encoding encoder = System.Text.Encoding.ASCII;
byte[] combined = encoder.GetBytes(str);
////byte 转换
//sbyte[] myByte = new sbyte[]
//byte[] mySByte = new byte[myByte.Length];
//for (int i = 0; i < myByte.Length; i++)
//{
// if (myByte[i] > 127)
// mySByte[i] = (sbyte)(myByte[i] - 256);
// else
// mySByte[i] = (sbyte)myByte[i];
//}
byte[] digest = hash.ComputeHash(combined);
LogHelper.AddLog2(553, string.Join(";", digest), null);
StringBuilder hexstr = new StringBuilder();
String shaHex = "";
for (int i = 0; i < digest.Length; i++)
{
shaHex = ((int)digest[i]).ToString("x");// Integer.toHexString(digest[i] & 0xFF);
if (shaHex.Length < 2)
{
hexstr.Append(0);
}
hexstr.Append(shaHex);
}
LogHelper.AddLog2(554, hexstr.ToString(), null);
return(hexstr.ToString());
}
catch (Exception e)
{
throw new DingTalkEncryptException(DingTalkEncryptException.COMPUTE_SIGNATURE_ERROR);
}
}
