Functions/Private/Protect-Rijndael256ECB.ps1
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function Protect-Rijndael256ECB { [cmdletbinding()] param( [string]$Key, [string]$Plaintext ) $RijndaelProvider = New-Object -TypeName System.Security.Cryptography.RijndaelManaged # Set block size to 256 to imitate MCRYPT_RIJNDAEL_256 $RijndaelProvider.BlockSize = 256 # Make sure we use ECB mode, or the generated IV will fuck up the first block upon decryption $RijndaelProvider.Mode = [System.Security.Cryptography.CipherMode]::ECB $RijndaelProvider.Padding = [system.security.cryptography.PaddingMode]::Zeros; $RijndaelProvider.IV = [byte[]]@(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ) $RijndaelProvider.Key = [system.Text.Encoding]::Default.GetBytes($key) # This object will take care of the actual cryptographic transformation $Encryptor = $RijndaelProvider.CreateEncryptor($RijndaelProvider.Key, $RijndaelProvider.IV) # Set up a memorystream that we can write encrypted data back to $EncMemoryStream = New-Object System.IO.MemoryStream $EncCryptoStream = New-Object System.Security.Cryptography.CryptoStream -ArgumentList $EncMemoryStream, $Encryptor, "Write" $EncStreamWriter = New-Object System.IO.StreamWriter -ArgumentList $EncCryptoStream # When we write data back to the CryptoStream, it'll get encrypted and written back to the MemoryStream $EncStreamWriter.Write($Plaintext) # Close the writer $EncStreamWriter.Close() # Close the CryptoStream (pads and flushes any data still left in the buffer) $EncCryptoStream.Close() $EncMemoryStream.Close() # Read the encrypted message from the memory stream $Cipher = $EncMemoryStream.ToArray() -as [byte[]] $CipherText = [convert]::ToBase64String($Cipher) # return base64 encoded encrypted string return $CipherText } |