4029 error while decrypt
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Play videoPlease edit your post.
For large amounts of code, attach it. - You don't show your array declaration, nor indicate which line has the error. There are no mind readers here.
Dear friends,
I am trying to decode the encrypted data that is stored in a file. While doing so, I am getting 4029 ERR_ARRAY_INVALID. I tried to solve it, but not able to do so. Can any one find the problem in this code.
if(FileIsExist("Mytext.txt",0)){res=CryptDecode(CRYPT_DES,dst,key,src);
}
}
uchar src[],dst[],key[]; if(FileIsExist("Mytext.txt",0)){ ResetLastError(); int filehandle=FileOpen("Mytext",FILE_READ|FILE_TXT); if(filehandle!=INVALID_HANDLE){ str=FileReadString(filehandle); //--- print the string Print(" String from file : ",str," || StringLen(str) : ",StringLen(str)); //--- prepare key StringToCharArray(keystr,key); StringToCharArray(str,dst); res=CryptDecode(CRYPT_DES,dst,key,src); Print("res : ",res); if(res>0){ //--- print decoded data string source=CharArrayToString(src); PrintFormat("Decoded data: size=%d, string='%s' ",ArraySize(src),CharArrayToString(src)); }else Print("Error code=",GetLastError()); FileClose(filehandle); } }
Sorry friend, I have updated it. Thanks
It may not be the only problem - you have not shown us the encryption code - but using FILE_TXT with the encrypted data is going to be unreliable. For example, if the encrypted data contains a 0x0D character (\r), then FileReadString will only return the data up to that point; the reading of the file will be truncated.
You should write and read the encrypted file using FILE_BIN, not FILE_TXT.
For example:
void OnStart() { // Name of file to write and read; raw data to be encrypted, plus encryption cipher // and key of appropriate length (with the key converted from a string to a byte array) string strDataFileName = "test.dat"; // Name of file to write string strOriginalData = "This is a test"; // Data to encrypt ENUM_CRYPT_METHOD cipher = CRYPT_AES256; // Encryption method string strKey = "01234567890123456789012345678901"; // Key for encryption uchar arrKey[]; StringToCharArray(strKey, arrKey); // Encrypt the data to a file; read the data back again and decrypt it; // and check that the decrypted result matches the original if (EncryptToFile(cipher, arrKey, strOriginalData, strDataFileName)) { string strDecryptedResult; if (DecryptFromFile(cipher, arrKey, strDataFileName, strDecryptedResult)) { if (strDecryptedResult == strOriginalData) { Print("Succeeded; decrypted data matches original!"); } else { Print("FAILED: Decrypted data does not match original!"); } } else { // Error in decryption; already logged } } else { // Error in encryption; already logged } } // Encrypts the data to the specified filename, returning true/false bool EncryptToFile(ENUM_CRYPT_METHOD cipher, uchar & Key[], string strUnencryptedData, string strDataFileName) { // Convert the unencrypted string to a byte array uchar arrUnencryptedData[]; StringToCharArray(strUnencryptedData, arrUnencryptedData); // Encrypt the raw data uchar arrEncryptedData[]; int szEnc = CryptEncode(cipher, arrUnencryptedData, Key, arrEncryptedData); if (szEnc <= 0) {Print("CryptEncode failed");return false;} // Write the encrypted data to a file int fWrite = FileOpen(strDataFileName, FILE_WRITE | FILE_BIN); if (fWrite == INVALID_HANDLE) {Print("Unable to open file for writing");return false;} FileWriteArray(fWrite, arrEncryptedData); FileClose(fWrite); return true; } // Decrypts the data from the specified filename, returning true/false. // If successful (i.e. true), the decrypted data is passed back by reference in strResult bool DecryptFromFile(ENUM_CRYPT_METHOD cipher, uchar & Key[], string strDataFileName, string & strResult) { strResult = ""; // Read the encrypted data back from the file uchar arrFileData[]; int fRead = FileOpen(strDataFileName, FILE_READ | FILE_BIN); if (fRead == INVALID_HANDLE) {Print("Unable to open file for reading");return false;} FileReadArray(fRead, arrFileData); FileClose(fRead); // Decrypt the data uchar arrDecryptedData[]; int szDec = CryptDecode(cipher, arrFileData, Key, arrDecryptedData); if (szDec <= 0) {Print("CryptDecode failed");return false;} // Convert the decrypted data back from an array to a string, and pass back by reference strResult = CharArrayToString(arrDecryptedData); return true; }
It may not be the only problem - you have not shown us the encryption code - but using FILE_TXT with the encrypted data is going to be unreliable. For example, if the encrypted data contains a 0x0D character (\r), then FileReadString will only return the data up to that point; the reading of the file will be truncated.
You should write and read the encrypted file using FILE_BIN, not FILE_TXT.
For example:
Thank you jjc for identifying the mistake.
I made 2 mistake
- I used FILE_TXT
- While writing to file I used FileWriteArray(), but while retrieving data from file I have used FileReadString(). Thus I got error 4029.
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Dear friends,
I am trying to decode the encrypted data that is stored in a file. While doing so, I am getting 4029 ERR_ARRAY_INVALID. I tried to solve it, but not able to do so. Can any one find the problem in this code.
if(FileIsExist("Mytext.txt",0)){res=CryptDecode(CRYPT_DES,dst,key,src);
}
}