aes encryption

  1. KMatle

    B4J Tutorial [B4x]Padding/depadding PKCS7/5 and other

    EDIT: If the message length is equal to the pad length, you have to pad to the next multiple. E.g. 16 bytes would be padded to 32 because one would not know how long the message was because the last byte defines the number of added (=padded) values. Here's another example to pad/depad data for...
  2. KMatle

    B4J Code Snippet [B4x] AES-256 encryption with salt and iv (works with all platforms like php, .net, etc.)

    This example is based on agrahams encryption library: Encryption Lib 1. Generate a 32 byte pw (just call the sub) and store it 2. Encrypt the data by calling AES_Encrypt. Return is a byte array or a base64 encoded string 3. Salt is a random value which is added at the beginning of the encrypted...
  3. N

    Android Question Read a big file an encrypt this using RandomAccessFile(RAF)

    Hi Guys i want to make a file encrypter ... normally for larg files i get OutOfMemory error ... how i can use RAF for this work ? Sub ReadFile(Dir As String, flname As String) As Byte() Dim out As OutputStream out.InitializeToBytesArray(100) 'size not really important...
  4. P

    B4J Question Encryption method to store sensitive information

    Hello all, Happy New year I am designing an application that has a need to store sensitive information ( CC with CVV ) for recurring payments. ( Yes, I know we should avoid this where possible ) I have looked at various methods of doing this. 1. Encrypt data in B4J and store it in the DB...
  5. ALBRECHT

    Android Question aes encryption with key and iv => decryption server side

    Hello, After looking for some days the right way to decrypt and check via my API (in ASP vbscript) from a remote server, a string sent by poststring from my APP and encrypted with AES 128bits with key and iv specific , I can share my result with you : App Side Sub : Sub...
  6. KMatle

    Android Tutorial [B4x] AES Encryption (lessons learned & best practice)

    Last weekend I migrated my XAMPP test environment (Apache/PHP/MySql). It came with PHP 7.x. Yesterday I wanted to test one of my Apps using AES and Mcrypt for it in PHP but it didn't work no more. I noticed that MCrypt was deprecated anyway and even was removed due to security and other issues...
  7. N

    iOS Question Error decoding data as string AES Decryption

    Please am getting this error when decrypting an encrypted string using IV and . "Error decoding data as string." When I Use Dim result As String= BytesToString(data,0,data.Length,"UTF-8") <B4IExceptionWrapper: Error Domain=caught_exception Code=0 " Error decoding data as string."...
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