/*
* 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)
{
throw new DingTalkEncryptException(DingTalkEncryptException.COMPUTE_ENCRYPT_TEXT_ERROR);
}
}
/*
* 对密文进行解密.
* @param text 需要解密的密文
* @return 解密得到的明文
*/
private String decrypt(String text)
{
byte[] originalArr;
try
{
byte[] toEncryptArray = Convert.FromBase64String(text);
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.CreateDecryptor();
originalArr = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
//return System.Text.UTF8Encoding.UTF8.GetString(resultArray);
//// 设置解密模式为AES的CBC模式
//Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
//SecretKeySpec keySpec = new SecretKeySpec(aesKey, "AES");
//IvParameterSpec iv = new IvParameterSpec(Arrays.copyOfRange(aesKey, 0, 16));
//cipher.init(Cipher.DECRYPT_MODE, keySpec, iv);
//// 使用BASE64对密文进行解码
//byte[] encrypted = Base64.decodeBase64(text);
//// 解密
//originalArr = cipher.doFinal(encrypted);
}
catch (Exception e)
{
throw new DingTalkEncryptException(DingTalkEncryptException.COMPUTE_DECRYPT_TEXT_ERROR);
}
String plainText;
String fromCorpid;
try
{
// 去除补位字符
byte[] bytes = PKCS7Padding.removePaddingBytes(originalArr);
Console.Out.WriteLine("bytes size:" + bytes.Length);
// 分离16位随机字符串,网络字节序和corpId
byte[] networkOrder = bytes.Skip(16).Take(4).ToArray();// Arrays.copyOfRange(bytes, 16, 20);
for (int i = 0; i < 4; i++)
{
Console.Out.WriteLine("networkOrder size:" + (int)networkOrder[i]);
}
Console.Out.WriteLine("bytes plainText:" + networkOrder.Length + " " + JsonSerializer.Serialize(networkOrder));
int plainTextLegth = Utils.bytes2int(networkOrder);
Console.Out.WriteLine("bytes size:" + plainTextLegth);
plainText = System.Text.UTF8Encoding.UTF8.GetString(bytes.Skip(20).Take(plainTextLegth).ToArray()); // new String(Arrays.copyOfRange(bytes, 20, 20 + plainTextLegth), CHARSET);
fromCorpid = System.Text.UTF8Encoding.UTF8.GetString(bytes.Skip(20 + plainTextLegth).ToArray()); //new String(Arrays.copyOfRange(bytes, 20 + plainTextLegth, bytes.length), CHARSET);
Console.Out.WriteLine("bytes plainText:" + plainText);
}
catch (Exception e)
{
throw new DingTalkEncryptException(DingTalkEncryptException.COMPUTE_DECRYPT_TEXT_LENGTH_ERROR);
}
Console.Out.WriteLine(fromCorpid + "=====" + corpId);
// corpid不相同的情况
if (!fromCorpid.Equals(corpId))
{
throw new DingTalkEncryptException(DingTalkEncryptException.COMPUTE_DECRYPT_TEXT_CORPID_ERROR);
}
return(plainText);
}
