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Compatibility between AesJS and C# System.Security.Cryptography

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0

I'm developing an application in NodeJS that consums a C# API. And I want to implement securized calls with AES. I'm using AesJS in NodeJS and System.Security.Cryptography in C#.

The C# part is used in other parts of the application and works correctly, so I'm guessing my error is in the NodeJS part.

The error is:

Invalid length for a Base-64 char array or string.

My code:

NodeJS

encryptData = function(data) 
 var key = pbkdf2.pbkdf2Sync(config.aes.pass, config.aes.salt, 1, 128 / 8, null);
 var dataBytes = aesjs.utils.utf8.toBytes(data);
 var ivBytes = aesjs.utils.utf8.toBytes(config.aes.iv);
 var aesOfb = new aesjs.ModeOfOperation.ofb(key, ivBytes);
 var encryptedBytes = aesOfb.encrypt(dataBytes);
 var encryptedHex = aesjs.utils.hex.fromBytes(encryptedBytes);

 return encryptedHex;

C#

public static string DecodeAndDecrypt(string encrypted)

 using (var csp = Aes.Create())
 
 var d = GetCryptoTransform(csp, false);
 byte[] output = Convert.FromBase64String(encrypted);
 byte[] decryptedOutput = d.TransformFinalBlock(output, 0, output.Length);
 string decypted = Encoding.UTF8.GetString(decryptedOutput);
 return decypted;
 

The error happens in this line:

byte[] output = Convert.FromBase64String(encrypted);

UPDATE

In order to test what's commented, I added parse to base64 in NodeJS:

return Buffer.from(encryptedHex).toString('base64');

Now I'm getting one step ahead into:

byte[] decryptedOutput = d.TransformFinalBlock(output, 0, output.Length);

And it returns error:

The input data is not a complete block.

c# node.js aes

share|improve this question

edited Mar 8 at 11:12

Andrés Marotta

asked Mar 8 at 9:41

Andrés MarottaAndrés Marotta

89212

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Can you add details about the exception you are getting ?
  
  – Manoj Choudhari
  Mar 8 at 9:43
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It really doesn't say much more. I can post the StackTrace if you want.
  
  – Andrés Marotta
  Mar 8 at 9:45
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I'm not sure aesjs.utils.hex.fromBytes() produces Base64 encoding - it just converts to hexadecimal which is not the same thing.
  
  – spodger
  Mar 8 at 10:23
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It's the way documentation says it's used: npmjs.com/package/aes-js#ofb---output-feedback
  
  – Andrés Marotta
  Mar 8 at 10:46
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That document makes no mention of Base64 encoding. In fact the example it gives shows the output"55e3af2638c560b4fdb9d26a630733ea60197ec23deb85b1f60f71f10409ce27" which is hex not Base64.
  
  – spodger
  Mar 8 at 10:50
  

  
  
  
  

 | 
show 3 more comments

0

I'm developing an application in NodeJS that consums a C# API. And I want to implement securized calls with AES. I'm using AesJS in NodeJS and System.Security.Cryptography in C#.

The C# part is used in other parts of the application and works correctly, so I'm guessing my error is in the NodeJS part.

The error is:

Invalid length for a Base-64 char array or string.

My code:

NodeJS

encryptData = function(data) 
 var key = pbkdf2.pbkdf2Sync(config.aes.pass, config.aes.salt, 1, 128 / 8, null);
 var dataBytes = aesjs.utils.utf8.toBytes(data);
 var ivBytes = aesjs.utils.utf8.toBytes(config.aes.iv);
 var aesOfb = new aesjs.ModeOfOperation.ofb(key, ivBytes);
 var encryptedBytes = aesOfb.encrypt(dataBytes);
 var encryptedHex = aesjs.utils.hex.fromBytes(encryptedBytes);

 return encryptedHex;

C#

public static string DecodeAndDecrypt(string encrypted)

 using (var csp = Aes.Create())
 
 var d = GetCryptoTransform(csp, false);
 byte[] output = Convert.FromBase64String(encrypted);
 byte[] decryptedOutput = d.TransformFinalBlock(output, 0, output.Length);
 string decypted = Encoding.UTF8.GetString(decryptedOutput);
 return decypted;
 

The error happens in this line:

byte[] output = Convert.FromBase64String(encrypted);

UPDATE

In order to test what's commented, I added parse to base64 in NodeJS:

return Buffer.from(encryptedHex).toString('base64');

Now I'm getting one step ahead into:

byte[] decryptedOutput = d.TransformFinalBlock(output, 0, output.Length);

And it returns error:

The input data is not a complete block.

c# node.js aes

share|improve this question

edited Mar 8 at 11:12

Andrés Marotta

asked Mar 8 at 9:41

Andrés MarottaAndrés Marotta

89212

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Can you add details about the exception you are getting ?
  
  – Manoj Choudhari
  Mar 8 at 9:43
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It really doesn't say much more. I can post the StackTrace if you want.
  
  – Andrés Marotta
  Mar 8 at 9:45
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I'm not sure aesjs.utils.hex.fromBytes() produces Base64 encoding - it just converts to hexadecimal which is not the same thing.
  
  – spodger
  Mar 8 at 10:23
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It's the way documentation says it's used: npmjs.com/package/aes-js#ofb---output-feedback
  
  – Andrés Marotta
  Mar 8 at 10:46
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That document makes no mention of Base64 encoding. In fact the example it gives shows the output"55e3af2638c560b4fdb9d26a630733ea60197ec23deb85b1f60f71f10409ce27" which is hex not Base64.
  
  – spodger
  Mar 8 at 10:50
  

  
  
  
  

 | 
show 3 more comments

I'm developing an application in NodeJS that consums a C# API. And I want to implement securized calls with AES. I'm using AesJS in NodeJS and System.Security.Cryptography in C#.

The C# part is used in other parts of the application and works correctly, so I'm guessing my error is in the NodeJS part.

The error is:

Invalid length for a Base-64 char array or string.

My code:

NodeJS

encryptData = function(data) 
 var key = pbkdf2.pbkdf2Sync(config.aes.pass, config.aes.salt, 1, 128 / 8, null);
 var dataBytes = aesjs.utils.utf8.toBytes(data);
 var ivBytes = aesjs.utils.utf8.toBytes(config.aes.iv);
 var aesOfb = new aesjs.ModeOfOperation.ofb(key, ivBytes);
 var encryptedBytes = aesOfb.encrypt(dataBytes);
 var encryptedHex = aesjs.utils.hex.fromBytes(encryptedBytes);

 return encryptedHex;

C#

public static string DecodeAndDecrypt(string encrypted)

 using (var csp = Aes.Create())
 
 var d = GetCryptoTransform(csp, false);
 byte[] output = Convert.FromBase64String(encrypted);
 byte[] decryptedOutput = d.TransformFinalBlock(output, 0, output.Length);
 string decypted = Encoding.UTF8.GetString(decryptedOutput);
 return decypted;
 

The error happens in this line:

byte[] output = Convert.FromBase64String(encrypted);

UPDATE

In order to test what's commented, I added parse to base64 in NodeJS:

return Buffer.from(encryptedHex).toString('base64');

Now I'm getting one step ahead into:

byte[] decryptedOutput = d.TransformFinalBlock(output, 0, output.Length);

And it returns error:

The input data is not a complete block.

c# node.js aes

share|improve this question

edited Mar 8 at 11:12

Andrés Marotta

asked Mar 8 at 9:41

Andrés MarottaAndrés Marotta

89212

encryptData = function(data) 
 var key = pbkdf2.pbkdf2Sync(config.aes.pass, config.aes.salt, 1, 128 / 8, null);
 var dataBytes = aesjs.utils.utf8.toBytes(data);
 var ivBytes = aesjs.utils.utf8.toBytes(config.aes.iv);
 var aesOfb = new aesjs.ModeOfOperation.ofb(key, ivBytes);
 var encryptedBytes = aesOfb.encrypt(dataBytes);
 var encryptedHex = aesjs.utils.hex.fromBytes(encryptedBytes);

 return encryptedHex;

public static string DecodeAndDecrypt(string encrypted)

 using (var csp = Aes.Create())
 
 var d = GetCryptoTransform(csp, false);
 byte[] output = Convert.FromBase64String(encrypted);
 byte[] decryptedOutput = d.TransformFinalBlock(output, 0, output.Length);
 string decypted = Encoding.UTF8.GetString(decryptedOutput);
 return decypted;
 

return Buffer.from(encryptedHex).toString('base64');

share|improve this question

edited Mar 8 at 11:12

Andrés Marotta

asked Mar 8 at 9:41

Andrés MarottaAndrés Marotta

89212

share|improve this question

edited Mar 8 at 11:12

Andrés Marotta

asked Mar 8 at 9:41

Andrés MarottaAndrés Marotta

89212

asked Mar 8 at 9:41

Andrés MarottaAndrés Marotta

89212

asked Mar 8 at 9:41

Andrés MarottaAndrés Marotta

89212