EncryptionShell.psm1
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function New-ESKey { Process { $random = -join ((65..90) + (97..122) | Get-Random -Count 32 | % {[char]$_}) $encoding = New-Object System.Text.ASCIIEncoding $bytes = $encoding.GetBytes($random) return $bytes } } function Get-ESHash { <# .SYNOPSIS Gets the MD5 hash of a string. .DESCRIPTION Gets the MD5 hash of a string. .PARAMETER Data Data to be MD5 hashed. #> [cmdletbinding()] Param ( [Parameter(mandatory=$true)][string]$Data ) Process { try { $md5 = New-Object -TypeName System.Security.Cryptography.MD5CryptoServiceProvider $utf8 = New-Object -TypeName System.Text.UTF8Encoding $hash = [System.BitConverter]::ToString($md5.ComputeHash($utf8.GetBytes($data))) return $hash } catch { throw $_.exception.message } } } function Write-ESData { <# .SYNOPSIS Encrypts data using a passphrase. .DESCRIPTION Encrypts data using a passphrase. The longer and more complex you make the passphrase the better the encryption. .PARAMETER Data Data to be encrypted. .PARAMETER Key Passphrase used to encrypt the data. .EXAMPLE Write-ESData -Data "Encrypt me" -Key "Passphrase" This will provide a result like this - 76492d1116743f0423413b16050a5345MgB8AGIAawBxADIAVQBOADUAegBTAGwANgByAGwAQQBrAHAATwBKAFgAMwAvAFEAPQA9AHwAZAAzAGIANwA0ADEAYgAxAGYANQA2ADcANQA5AGIAMwAwADQAYgA5ADQAYgA3ADAAZgBkADUANAA1AGMAMgBlADQAZABmAGMAZQBlADMANwAzADEAMQAzADUAOABhAGMANAA5AGEAOQA5ADUAZQBmAGIAOQAwADIAZQBmADUAMQA= .EXAMPLE Write-ESData -Data (get-content .\test.txt -raw) -Key $Passphrase This will encrypt the text file content of test.txt. Please note that the -raw parameter was required in order to maintain the format of "string". Get-Content will automatically split the contents of a file into an array. #> [cmdletbinding()] Param ( [Parameter(mandatory=$true)][string]$Data, [Parameter(mandatory=$true)][string]$Key ) Process { try { $keydata = $null; $keydata = [Byte[]]($Key.PadRight(24).Substring(0,24).ToCharArray()) $encrypted = $null; $encrypted = $data | ConvertTo-SecureString -AsPlainText -Force | ConvertFrom-SecureString -Key $keydata return $encrypted } catch { throw $_.exception.message } } } function Read-ESData { <# .SYNOPSIS Decrypts data encrypted using the Write-ESData cmdlet. .DESCRIPTION Decrypts data encrypted using the Write-ESData cmdlet. .PARAMETER Data Data to be decrypted. .PARAMETER Key Passphrase used to decrypt the data. .EXAMPLE Read-ESData -Data $EncryptedData -Key $Passphrase #> [cmdletbinding()] Param ( [Parameter(mandatory=$true,valuefrompipelinebypropertyname=$true)][string]$Data, [Parameter(mandatory=$true,valuefrompipelinebypropertyname=$true)][string]$Key ) Process { try { $keydata = $null; $keydata = [Byte[]]($Key.PadRight(24).Substring(0,24).ToCharArray()) $decrypted = $null; $decrypted = ConvertTo-SecureString -string $Data -Key $keydata -erroraction stop $decrypted = [Runtime.InteropServices.Marshal]::PtrToStringAuto([Runtime.InteropServices.Marshal]::SecureStringToBSTR($decrypted)) return $decrypted } catch { throw $_.exception.message } } } |