Public/New-EncryptedFile.ps1
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<# .SYNOPSIS This function can encrypt a String, Array of Strings, File, or Files in a Directory. Strings and Arrays of Strings passed to the -ContentToEncrypt parameter are written to their own separate encrypted files on the file system. Encrypting one or more Files creates a NEW encrypted version of the original File(s). It DOES NOT TOUCH the original unencrypted File(s). .DESCRIPTION See SYNOPSIS. .NOTES Please use this function responsibly. IMPORTANT NOTE #1: The Certificate used for RSA Encryption is written out (in .pfx format) to the same directory as the encrypted file outputs. If AES encryption is needed for larger Files, the RSA-encrypted AES Key is written to the same directory as the encrypted file outputs. You will ALWAYS need a private key from your Certificate's public/private pair in order to decrypt content encrypted via this function. You will be able to get this private key from the .pfx file that you provide to the -PathToPfxFile parameter, or from the Certificate in the Cert:\LocalMachine\My store that you provide to the -CNofCertInStore parameter of this function. You will SOMETIMES need the AES Key to decrypt larger files that were encrypted using AES encryption. IMPORTANT NOTE #2: It is up to you to store the public/private key pair and the RSA-encrypted AES Key appropriately. Note that the public/private key pair will be found EITHER in a .pfx file in the same directory as encrypted file outputs OR in Cert:\LocalMachine\My OR in BOTH locations. Note that the RSA-encrypted AES Key will be found in a file in the same directory as encrypted file outputs. .PARAMETER SourceType Optional, but HIGHLY recommended. This parameter takes a string with one of the following values: String ArrayOfStrings File Directory If -ContentToEncrypt is a string, -SourceType should be "String". If -ContentToEncrypt is an array of strings, -SourceType should be "ArrayOfStrings". If -ContentToEncrypt is a string that represents a full path to a file, -SourceType should be "File". If -ContentToEncrypt is a string that represents a full path to a directory, -SourceType should be "Directory". .PARAMETER ContentToEncrypt Mandatory. This parameter takes a string that is either: - A string - An array of strings - A string that represents a full path to a file - A string that represents a full path to a directory .PARAMETER Recurse Optional. This parameter is a switch. It should only be used if -SourceType is "Directory". The function will fail immediately if this parameter is used and -SourceType is NOT "Directory". If this switch is NOT used, only files immediately under the directory specified by -ContentToEncrypt are encrypted. If this switch IS used, all files immediately under the directory specified by -ContentToEncrypt AS WELL AS all files within subdirectories under the directory specified by -ContentToEncrypt are encrypted. .PARAMETER FileToOutput Optional. This parameter specifies a full path to a NEW file that will contain encrypted information. This parameter should ONLY be used if -SourceType is "String" or "ArrayOfStrings". If this parameter is used and -SourceType is NOT "String" or "ArrayOfStrings", the function will immediately fail. .PARAMETER PathToPfxFile Optional. This parameter takes a string that represents the full path to a .pfx file. The public certificate in the .pfx file will be used for RSA encryption. NOTE: RSA encryption is ALWAYS used by this function, either to encrypt the information directly or to encrypt the AES Key that was used to encrypt the information. .PARAMETER CNOfCertInStore Optional. This parameter takes a string that represents the Common Name (CN) of the public certificate used for RSA encryption. This certificate must already exist in the Local Machine Store (i.e. Cert:\LocalMachine\My). NOTE: RSA encryption is ALWAYS used by this function, either to encrypt the information directly or to encrypt the AES Key that was used to encrypt the information. .PARAMETER CNOfNewCert Optional. This parameter takes a string that represents the desired Common Name (CN) for the new Self-Signed Certificate. NOTE: RSA encryption is ALWAYS used by this function, either to encrypt the information directly or to encrypt the AES Key that was used to encrypt the information. .PARAMETER CertPwd Optional. (However, this parameter is mandatory if the certificate is password protected). This parameter takes a System.Security.SecureString that represents the password for the certificate. Use this parameter if the certificate is password protected. .PARAMETER RemoveOriginalFile Optional. This parameter is a switch. By default, original unencrypted files are not touched. Use this switch to remove the original unencrypted files. .EXAMPLE # String Encryption Example # NOTE: If neither -PathToPfxFile nor -CNOfCertInStore parameters are used, a NEW Self-Signed Certificate is # created and added to Cert:\LocalMachine\My PS C:\Users\zeroadmin> New-EncryptedFile -SourceType String -ContentToEncrypt "MyPLaInTeXTPwd321!" -FileToOutput $HOME\MyPwd.txt FileEncryptedViaRSA : C:\Users\zeroadmin\MyPwd.txt.rsaencrypted FileEncryptedViaAES : OriginalFile : CertficateUsedForRSAEncryption : [Subject] CN=MyPwd [Issuer] CN=MyPwd [Serial Number] 6BD1BF9FACE6F0BB4EFFC31597E9B970 [Not Before] 6/2/2017 10:39:31 AM [Not After] 6/2/2018 10:59:31 AM [Thumbprint] 34F3526E85C04CEDC79F26C2B086E52CF75F91C3 LocationOfCertUsedForRSAEncryption : Cert:\LocalMachine\My\34F3526E85C04CEDC79F26C2B086E52CF75F91C3 UnprotectedAESKey : RSAEncryptedAESKey : RSAEncryptedAESKeyLocation : AllFileOutputs : C:\Users\zeroadmin\MyPwd.txt.rsaencrypted .EXAMPLE # ArrayOfStrings Encryption Example PS C:\Users\zeroadmin> $foodarray = @("fruit","vegetables","meat") PS C:\Users\zeroadmin> New-EncryptedFile -SourceType ArrayOfStrings -ContentToEncrypt $foodarray -PathToPfxFile C:\Users\zeroadmin\other\ArrayOfStrings.pfx -FileToOutput $HOME\Food.txt FilesEncryptedViaRSA : {C:\Users\zeroadmin\Food.txt0.rsaencrypted, C:\Users\zeroadmin\Food.txt1.rsaencrypted, C:\Users\zeroadmin\Food.txt2.rsaencrypted} FilesEncryptedViaAES : OriginalFiles : CertficateUsedForRSAEncryption : [Subject] CN=ArrayOfStrings [Issuer] CN=ArrayOfStrings [Serial Number] 32E38D18591854874EC467B73332EA76 [Not Before] 6/1/2017 4:13:36 PM [Not After] 6/1/2018 4:33:36 PM [Thumbprint] C8CC2B8B03E33821A69B35F10B04D74E40A557B2 LocationOfCertUsedForRSAEncryption : C:\Users\zeroadmin\other\ArrayOfStrings.pfx UnprotectedAESKey : RSAEncryptedAESKey : RSAEncryptedAESKeyLocation : AllFileOutputs : {C:\Users\zeroadmin\Food.txt0.rsaencrypted, C:\Users\zeroadmin\Food.txt1.rsaencrypted, C:\Users\zeroadmin\Food.txt2.rsaencrypted} .EXAMPLE # File Encryption Example PS C:\Users\zeroadmin> $ZeroTestPwd = Read-Host -Prompt "Enter password for ZeroTest Cert" -AsSecureString Enter password for ZeroTest Cert: *********************** PS C:\Users\zeroadmin> New-EncryptedFile -SourceType File -ContentToEncrypt C:\Users\zeroadmin\tempdir\lorumipsum.txt -CNofCertInStore "ZeroTest" -CertPwd $ZeroTestPwd FileEncryptedViaRSA : FileEncryptedViaAES : C:\Users\zeroadmin\tempdir\lorumipsum.txt.aesencrypted OriginalFile : C:\Users\zeroadmin\tempdir\lorumipsum.txt.original CertficateUsedForRSAEncryption : [Subject] CN=ZeroTesting.zero.lab [Issuer] <redacted> [Serial Number] <redacted> [Not Before] <redacted> [Not After] <redacted> [Thumbprint] 34F3526E85C04CEDC79F26C2B086E52CF75F91C3 LocationOfCertUsedForRSAEncryption : Cert:\LocalMachine\My\34F3526E85C04CEDC79F26C2B086E52CF75F91C3 UnprotectedAESKey : E0588dE3siWEOAyM7A5+6LKqC5tG1egxXTfsUUE5sNM= RSAEncryptedAESKey : NkKjOwd8T45u1Hpn0CL9m5zD/97PG9GNnJCShh0vOUTn+m+E2nLFxuW7ChKiHCVtP1vD2z+ckW3kk1va3PAfjw3/hfm9zi2qn4Xu7kPdWL1owDdQyvBuUPTc35 FSqaIJxxdsqWLnUHo1PINY+2usIPT5tf57TbTKbAg5q/RXOzCeUS+QQ+nOKMgQGnadlUVyyIYo2JRdzzKaTSHRwK4QFdDk/PUy39ei2FVOIlwitiAkWTyjFAb6 x+kMCgOVDuALGOyVVBdNe+BDrrWgqnfRSCHSZoQKfnkA0dj0tuE2coYNwGQ6SVUmiDrdklBrnKl69cIFf8lkTSsUqGdq9bbaag== RSAEncryptedAESKeyLocation : C:\Users\zeroadmin\tempdir\lorumipsum.aeskey.rsaencrypted AllFileOutputs : {C:\Users\zeroadmin\tempdir\lorumipsum.txt.aesencrypted, C:\Users\zeroadmin\tempdir\lorumipsum.txt.original, C:\Users\zeroadmin\tempdir\lorumipsum.aeskey.rsaencrypted} .EXAMPLE # Directory Encryption Example # NOTE: If neither -PathToPfxFile nor -CNOfCertInStore parameters are used, a NEW Self-Signed Certificate is # created and added to Cert:\LocalMachine\My PS C:\Users\zeroadmin> New-EncryptedFile -SourceType Directory -ContentToEncrypt C:\Users\zeroadmin\tempdir Please enter the desired CN for the new Self-Signed Certificate: TempDirEncryption FilesEncryptedViaRSA : FilesEncryptedViaAES : {C:\Users\zeroadmin\tempdir\agricola.txt.aesencrypted, C:\Users\zeroadmin\tempdir\dolor.txt.aesencrypted, C:\Users\zeroadmin\tempdir\lorumipsum.txt.aesencrypted} OriginalFiles : {C:\Users\zeroadmin\tempdir\agricola.txt.original, C:\Users\zeroadmin\tempdir\dolor.txt.original, C:\Users\zeroadmin\tempdir\lorumipsum.txt.original} CertficateUsedForRSAEncryption : [Subject] CN=TempDirEncryption [Issuer] CN=TempDirEncryption [Serial Number] 52711274E381F592437E8C18C7A3241C [Not Before] 6/2/2017 10:57:26 AM [Not After] 6/2/2018 11:17:26 AM [Thumbprint] F2EFEBB37C37844A230961447C7C91C1DE13F1A5 LocationOfCertUsedForRSAEncryption : Cert:\LocalMachine\My\F2EFEBB37C37844A230961447C7C91C1DE13F1A5 UnprotectedAESKey : BKcLSwqZjSq/D1RuqBGBxZ0dng+B3JwrWJVlhqgxrmo= RSAEncryptedAESKey : sUshzhMfrbO5FgOGw1Nsx9g5hrnsdUHsJdx8SltK8UeNcCWq8Rsk6dxC12NjrxUSHTSrPYdn5UycBqXB+PNltMebAj80I3Zsh5xRsSbVRSS+fzgGJTUw7ya98J 7vKISUaurBTK4C4Czh1D2bgT7LNADO7qAUgbnv+xdqxgIexlOeNsEkzG10Tl+DxkUVgcpJYbznoTXPUVnj9AZkcczRd2EWPcV/WZnTZwmtH+Ill7wbXSG3R95d dbQLZfO0eOoBB/DAYWcPkifxJf+20s25xA8MKl7pNpDUbVhGhp61VCaaEqr6QlgihtluqWZeRgHEY3xSzz/UVHhzjCc6Rs9aPw== RSAEncryptedAESKeyLocation : C:\Users\zeroadmin\tempdir\tempdir.aeskey.rsaencrypted AllFileOutputs : {C:\Users\zeroadmin\tempdir\agricola.txt.aesencrypted, C:\Users\zeroadmin\tempdir\dolor.txt.aesencrypted, C:\Users\zeroadmin\tempdir\lorumipsum.txt.aesencrypted, C:\Users\zeroadmin\tempdir\agricola.txt.original...} #> function New-EncryptedFile { [CmdletBinding()] Param( [Parameter(Mandatory=$True)] [ValidateSet("String","ArrayOfStrings","File","Directory")] [string]$SourceType, [Parameter(Mandatory=$True)] [string[]]$ContentToEncrypt, [Parameter(Mandatory=$False)] [switch]$Recurse, [Parameter(Mandatory=$False)] [string]$FileToOutput, [Parameter(Mandatory=$False)] [ValidatePattern("\.pfx$")] [string]$PathToPfxFile, [Parameter(Mandatory=$False)] [string]$CNofCertInStore, [Parameter(Mandatory=$False)] [string]$CNOfNewCert, [Parameter(Mandatory=$False)] [securestring]$CertPwd, [Parameter(Mandatory=$False)] [switch]$RemoveOriginalFile ) ##### BEGIN Parameter Validation ##### if ($SourceType -match "String|ArrayOfStrings" -and !$FileToOutput) { $FileToOutput = Read-Host -Prompt "Please enter the full path to the new Encrypted File you would like to generate." } if ($SourceType -eq "File" -or $SourceType -eq "Directory" -and $FileToOutput) { $ErrMsg = "The -FileToOutput should NOT be used when -SourceType is 'File' or 'Directory'. " + "Simply use '-SourceType File' or '-SourceType Directory' and output naming convention will be " + "handled automatically by the New-EncryptedFile function. Halting!" Write-Error $ErrMsg $global:FunctionResult = "1" return } if ($Recurse -and $SourceType -ne "Directory") { Write-Verbose "The -Recurse switch should only be used when -SourceType is 'Directory'! Halting!" Write-Error "The -Recurse switch should only be used when -SourceType is 'Directory'! Halting!" $global:FunctionResult = "1" return } if ($RemoveOriginalFile -and $SourceType -notmatch "File|Directory") { Write-Error "The -RemoveOriginalFile parameter should only be used when -SourceType is 'File' or 'Directory'! Halting!" $global:FunctionResult = "1" return } $RegexDirectoryPath = '^(([a-zA-Z]:\\)|(\\\\))((?![.<>:"\/\\|?*]).)+((?![.<>:"\/|?*]).)+$' $RegexFilePath = '^(([a-zA-Z]:\\)|(\\\\))((?![.<>:"\/\\|?*]).)+((?![<>:"\/|?*]).)+((.*?\.)|(.*?\.[\w]+))+$' # NOTE: The below Linux Regex representations are simply commonly used naming conventions - they are not # strict definitions of Linux File or Directory Path formats $LinuxRegexFilePath = '^((~)|(\/[\w^ ]+))+\/?([\w.])+[^.]$' $LinuxRegexDirectoryPath = '^((~)|(\/[\w^ ]+))+\/?$' if ($SourceType -eq "File" -and $ContentToEncrypt -notmatch $RegexFilePath -and $ContentToDecrypt -notmatch $LinuxRegexFilePath ) { $ErrMsg = "The -SourceType specified was 'File' but '$ContentToEncrypt' does not appear to " + "be a valid file path. This is either because a full path was not provided or because the file does " + "not have a file extenstion. Please correct and try again. Halting!" Write-Error $ErrMsg $global:FunctionResult = "1" return } if ($SourceType -eq "Directory" -and $ContentToEncrypt -notmatch $RegexDirectoryPath -and $ContentToDecrypt -notmatch $LinuxRegexDirectoryPath ) { $ErrMsg = "The -SourceType specified was 'Directory' but '$ContentToEncrypt' does not appear to be " + "a valid directory path. This is either because a full path was not provided or because the directory " + "name ends with something that appears to be a file extension. Please correct and try again. Halting!" Write-Error $ErrMsg $global:FunctionResult = "1" return } if ($SourceType -eq "File" -and !$(Test-Path $ContentToEncrypt)) { Write-Error "The path '$ContentToEncrypt' was not found! Halting!" $global:FunctionResult = "1" return } if ($SourceType -eq "Directory" -and !$(Test-Path $ContentToEncrypt)) { Write-Error "The path '$ContentToEncrypt' was not found! Halting!" $global:FunctionResult = "1" return } if ($SourceType -eq "Directory") { if ($Recurse) { $PossibleFilesToEncrypt = Get-ChildItem -Path $ContentToEncrypt -File -Recurse } if (!$Recurse) { $PossibleFilesToEncrypt = Get-ChildItem -Path $ContentToEncrypt -File } if ($PossibleFilesToEncrypt.Count -lt 1) { Write-Error "No files were found in the directory '$ContentToEncrypt'. Halting!" $global:FunctionResult = "1" return } } if ($FileToOutput) { $FileToOutputDirectory = $FileToOutput | Split-Path -Parent $FileToOutputFile = $FileToOutput | Split-Path -Leaf $FileToOutputFileSansExt = $($FileToOutputFile.Split("."))[0] if (! $(Test-Path $FileToOutputDirectory)) { Write-Error "The directory '$FileToOutputDirectory' does not exist. Please check the path. Halting!" $global:FunctionResult = "1" return } } if ($PathToPfxFile -and $CNofCertInStore) { $ErrMsg = "Please use *either* -PathToPfxFile *or* -CNOfCertInStore. Halting!" Write-Error $ErrMsg $global:FunctionResult = "1" return } # Validate PathToPfxFile if ($PathToPfxFile) { if (!$(Test-Path $PathToPfxFile)) { Write-Error "The path '$PathToPfxFile'was not found at the path specified. Halting." $global:FunctionResult = "1" return } # See if Cert is password protected try { # First, try null password $Cert1 = [System.Security.Cryptography.X509Certificates.X509Certificate2]::new($PathToPfxFile, $null, [System.Security.Cryptography.X509Certificates.X509KeyStorageFlags]::Exportable) } catch { Write-Warning "Either the Private Key in '$PathToPfxFile' is Password Protected, or it is marked as Unexportable..." if (!$CertPwd) { $CertPwd = Read-Host -Prompt "Please enter the password for the certificate. If there is no password, simply press [ENTER]" -AsSecureString } # Next, try $CertPwd try { $Cert1 = [System.Security.Cryptography.X509Certificates.X509Certificate2]::new($PathToPfxFile, $CertPwd, [System.Security.Cryptography.X509Certificates.X509KeyStorageFlags]::Exportable) } catch { $ErrMsg = "Either the password supplied for the Private Key in $PathToPfxFile' is " + "incorrect or it is not marked as Exportable! Halting!" Write-Error $ErrMsg $global:FunctionResult = "1" return } } } # Validate CNofCertInStore if ($CNofCertInStore) { [array]$Cert1 = @(Get-ChildItem "Cert:\LocalMachine\My" | Where-Object {$_.Subject -match "CN=$CNofCertInStore,"}) if ($Cert1.Count -gt 1) { Write-Warning "Multiple certificates under 'Cert:\LocalMachine\My' with a CommonName '$CNofCertInStore' have been identified! They are as follows:" for ($i=0; $i -lt $Cert1.Count; $i++) { Write-Host "$i) " + "Subject: " + $Cert1[$i].Subject + ' | Thumbprint: ' + $Cert1[$i].Thumbprint } $ValidChoiceNumbers = 0..$($Cert1.Count-1) $CertChoicePrompt = "Please enter the number that corresponds to the Certificate that you " + "would like to use. [0..$($Cert1.Count-1)]" $CertChoice = Read-Host -Prompt $CertChoicePrompt while ($ValidChoiceNumbers -notcontains $CertChoice) { Write-Host "'$CertChoice' is not a valid choice number! Valid choice numbers are $($ValidChoiceNumbers -join ",")" $CertChoice = Read-Host -Prompt $CertChoicePrompt } $Cert1 = $Cert1[$CertChoice] } if ($Cert1.Count -lt 1) { Write-Error "Unable to find a a certificate matching CN=$CNofCertInStore in 'Cert:\LocalMachine\My'! Halting!" $global:FunctionResult = "1" return } if ($Cert1.Count -eq 1) { $Cert1 = $Cert1[0] } } if ($(-not $PSBoundParameters['PathToPfxFile']) -and $(-not $PSBoundParameters['CNofCertInStore'])) { if (!$FileToOutput -and !$CNOfNewCert) { $CNOfNewCert = Read-Host -Prompt "Please enter the desired CN for the new Self-Signed Certificate" } if ($FileToOutput -and !$CNofNewCert) { $CNOfNewCert = $FileToOutputFileSansExt } # Create the Self-Signed Cert and add it to the Personal Local Machine Store # Check to see if a Certificate with CN=$FileToOutputFileSansExt exists in the Local Machine Store already [array]$LocalMachineCerts = @(Get-ChildItem Cert:\LocalMachine\My) [array]$FoundMatchingExistingCert = @($LocalMachineCerts | Where-Object {$_.Subject -match "CN=$CNOfNewCert"}) if ($FoundMatchingExistingCert.Count -gt 1) { Write-Warning "Multiple certificates under 'Cert:\LocalMachine\My' with a CommonName '$CNofCertInStore' have been identified!" $UseExistingCert = Read-Host -Prompt "Would you like to use and existing certificate? [Yes\No]" while (![bool]$($UseExistingCert -match "^yes$|^y$|^no$|^n$")) { Write-Host "'$UseExistingCert' is not a valid choice. Please enter either 'Yes' or 'No'" $UseExistingCert = Read-Host -Prompt "Would you like to use and existing certificate? [Yes\No]" } if ($UseExistingCert) { for ($i=0; $i -lt $Cert1.Count; $i++) { Write-Host "$i) " + "Subject: " + $Cert1[$i].Subject + ' | Thumbprint: ' + $Cert1[$i].Thumbprint } $ValidChoiceNumbers = 0..$($Cert1.Count-1) $CertChoicePrompt = "Please enter the number that corresponds to the Certificate that you " + "would like to use. [0..$($Cert1.Count-1)]" $CertChoice = Read-Host -Prompt $CertChoicePrompt while ($ValidChoiceNumbers -notcontains $CertChoice) { Write-Host "'$CertChoice' is not a valid choice number! Valid choice numbers are $($ValidChoiceNumbers -join ",")" $CertChoice = Read-Host -Prompt $CertChoicePrompt } $Cert1 = $Cert1[$CertChoice] } else { if ($FileToOutput) { $PfxOutputDir = $FileToOutput | Split-Path -Parent } if (!$FileToOutput -and $SourceType -eq "File") { if ($ContentToEncrypt.GetType().FullName -eq "System.String[]") { $PfxOutputDir = $ContentToEncrypt[0] | Split-Path -Parent } else { $PfxOutputDir = $ContentToEncrypt | Split-Path -Parent } } if (!$FileToOutput -and $SourceType -eq "Directory") { if ($ContentToEncrypt.GetType().FullName -eq "System.String[]") { $PfxOutputDir = $ContentToEncrypt[0] } else { $PfxOutputDir = $ContentToEncrypt } } $Cert1Prep = Get-EncryptionCert -CommonName $CNOfNewCert -ExportDirectory $PfxOutputDir $Cert1 = $Cert1Prep.CertInfo } } if ($FoundMatchingExistingCert.Count -eq 1) { $Cert1 = $FoundMatchingExistingCert[0] } if ($FoundMatchingExistingCert.Count -lt 1) { #$Cert1 = New-SelfSignedCertificate -CertStoreLocation "Cert:\LocalMachine\My" -DNSName "$FileToOutputFileSansExt" -KeyExportPolicy "Exportable" if ($FileToOutput) { $PfxOutputDir = $FileToOutput | Split-Path -Parent } if (!$FileToOutput -and $SourceType -eq "File") { if ($ContentToEncrypt.GetType().FullName -eq "System.String[]") { $PfxOutputDir = $ContentToEncrypt[0] | Split-Path -Parent } else { $PfxOutputDir = $ContentToEncrypt | Split-Path -Parent } } if (!$FileToOutput -and $SourceType -eq "Directory") { if ($ContentToEncrypt.GetType().FullName -eq "System.String[]") { $PfxOutputDir = $ContentToEncrypt[0] } else { $PfxOutputDir = $ContentToEncrypt } } $Cert1Prep = Get-EncryptionCert -CommonName $CNOfNewCert -ExportDirectory $PfxOutputDir $Cert1 = $Cert1Prep.CertInfo } } # Now we have $Cert1 (which is an X509Certificate2 object) # If user did not explicitly use $PathToPfxFile, export the $Cert1 to a .pfx file in the same directory as $FileToOutput # so that it's abundantly clear that it was used for encryption, even if it's already in the Cert:\LocalMachine\My Store if (!$PSBoundParameters['PathToPfxFile']) { $CertName = $($Cert1.Subject | Select-String -Pattern "^CN=[\w]+").Matches.Value -replace "CN=","" try { if ($FileToOutput) { $PfxOutputDir = $FileToOutput | Split-Path -Parent } if (!$FileToOutput -and $SourceType -eq "File") { if ($ContentToEncrypt.GetType().FullName -eq "System.String[]") { $PfxOutputDir = $ContentToEncrypt[0] | Split-Path -Parent } else { $PfxOutputDir = $ContentToEncrypt | Split-Path -Parent } } if (!$FileToOutput -and $SourceType -eq "Directory") { if ($ContentToEncrypt.GetType().FullName -eq "System.String[]") { $PfxOutputDir = $ContentToEncrypt[0] } else { $PfxOutputDir = $ContentToEncrypt } } $pfxbytes = $Cert1.Export([System.Security.Cryptography.X509Certificates.X509ContentType]::Pfx) [System.IO.File]::WriteAllBytes("$PfxOutputDir\$CertName.pfx", $pfxbytes) } catch { Write-Warning "Either the Private Key is Password Protected or it is marked as Unexportable...Asking for password to try and generate new .pfx file..." # NOTE: The $Cert1.Export() method in the above try block has a second argument for PlainTextPassword, but it doesn't seem to work consistently # Check to see if it's already in the Cert:\LocalMachine\My Store if ($(Get-Childitem "Cert:\LocalMachine\My").Thumbprint -contains $Cert1.Thumbprint) { Write-Verbose "The certificate $CertName is already in the Cert:\LocalMachine\My Store." } else { # IMPORTANT NOTE: For some reason, eventhough we have the X509Certificate2 object ($Cert1), it may not # have the Property 'PrivateKey' until we import it to the Cert:\LocalMachine\My and then export it. # This could be why why the above export in the ty block failed... Write-Host "Importing $CertName to Cert:\LocalMachine\My Store..." $X509Store = [System.Security.Cryptography.X509Certificates.X509Store]::new([System.Security.Cryptography.X509Certificates.StoreName]::My, [System.Security.Cryptography.X509Certificates.StoreLocation]::LocalMachine) $X509Store.Open([System.Security.Cryptography.X509Certificates.OpenFlags]::ReadWrite) $X509Store.Add($Cert1) } Write-Host "Attempting to export $CertName from Cert:\LocalMachine\My Store to .pfx file..." if (!$CertPwd) { $CertPwd = Read-Host -Prompt "Please enter the password for the private key in the certificate $CertName" -AsSecureString } try { $Cert1 = Get-Item "Cert:\LocalMachine\My\$($Cert1.Thumbprint)" [System.IO.File]::WriteAllBytes("$PfxOutputDir\$CertName.pfx", $Cert1.Export([System.Security.Cryptography.X509Certificates.X509ContentType]::Pkcs12, $CertPwd)) #Export-PfxCertificate -FilePath "$PfxOutputDir\$CertName.pfx" -Cert "Cert:\LocalMachine\My\$($Cert1.Thumbprint)" -Password $CertPwd $ExportPfxCertificateSuccessful = $true } catch { Write-Warning "Creating a .pfx file containing the public certificate used for encryption failed, but this is not strictly necessary and is only attempted for convenience. Continuing..." $ExportPfxCertificateSuccessful = $false } } } # If $Cert1 does NOT have a PrivateKey, ask the user if they're ABSOLUTELY POSITIVE they have the private key # before proceeding with encryption if ($Cert1.PrivateKey -eq $null -and $Cert1.HasPrivateKey -ne $True) { Write-Warning "Windows reports that there is NO Private Key associated with this X509Certificate2 object!" $ShouldWeContinue = Read-Host -Prompt "Are you ABSOLUTELY SURE you have the private key somewhere and want to proceed with encryption? [Yes\No]" if (![bool]$($ShouldWeContinue -match "^yes$|^y$")) { Write-Verbose "User specified halt! Halting!" Write-Error "User specified halt! Halting!" $global:FunctionResult = "1" return } } ##### END Parameter Validation ##### ##### BEGIN Main Body ##### $MaxNumberOfBytesThatCanBeEncryptedViaRSA = ((2048 - 384) / 8) + 37 if ($SourceType -eq "String") { $EncodedBytes1 = [system.text.encoding]::UTF8.GetBytes($ContentToEncrypt) if ($EncodedBytes1.Length -ge $MaxNumberOfBytesThatCanBeEncryptedViaRSA) { Write-Error "The string `$ContentToEncrypt is to large to encrypt via this method. Try writing it to a file first and then using this function to encrypt that file." $global:FunctionResult = "1" return } #$EncryptedBytes1 = $Cert1.PublicKey.Key.Encrypt($EncodedBytes1, $true) <# try { $EncryptedBytes1 = $Cert1.PublicKey.Key.Encrypt($EncodedBytes1, [System.Security.Cryptography.RSAEncryptionPadding]::OaepSHA256) } catch { $EncryptedBytes1 = $Cert1.PublicKey.Key.Encrypt($EncodedBytes1, [System.Security.Cryptography.RSAEncryptionPadding]::Pkcs1) } #> $EncryptedBytes1 = $Cert1.PublicKey.Key.Encrypt($EncodedBytes1, [System.Security.Cryptography.RSAEncryptionPadding]::Pkcs1) $EncryptedString1 = [System.Convert]::ToBase64String($EncryptedBytes1) $EncryptedString1 | Out-File "$FileToOutput.rsaencrypted" $CertLocation = if ($PathToPfxFile) { $PathToPfxFile } elseif (!$ExportPfxCertificateSuccessful) { "Cert:\LocalMachine\My" + '\' + $Cert1.Thumbprint } elseif ($ExportPfxCertificateSuccessful) { $("Cert:\LocalMachine\My" + '\' + $Cert1.Thumbprint),"$PfxOutputDir\$CertName.pfx" } [pscustomobject]@{ FileEncryptedViaRSA = "$FileToOutput.rsaencrypted" FileEncryptedViaAES = $null OriginalFile = $null CertficateUsedForRSAEncryption = $Cert1 LocationOfCertUsedForRSAEncryption = $CertLocation UnprotectedAESKey = $null RSAEncryptedAESKey = $null RSAEncryptedAESKeyLocation = $null AllFileOutputs = $(if ($PathToPfxFile) {"$FileToOutput.rsaencrypted"} else {"$FileToOutput.rsaencrypted","$PfxOutputDir\$CertName.pfx"}) } } if ($SourceType -eq "ArrayOfStrings") { $RSAEncryptedFiles = @() for ($i=0; $i -lt $ContentToEncrypt.Count; $i++) { # Determine if the contents of the File is too long for Asymetric RSA Encryption with pub cert and priv key $EncodedBytes1 = [system.text.encoding]::UTF8.GetBytes($ContentToEncrypt[$i]) if ($EncodedBytes1.Length -ge $MaxNumberOfBytesThatCanBeEncryptedViaRSA) { Write-Warning "The string in index $i of the `$ContentToEncrypt array is to large to encrypt via this method. Skipping..." continue } #$EncryptedBytes1 = $Cert1.PublicKey.Key.Encrypt($EncodedBytes1, $true) <# try { $EncryptedBytes1 = $Cert1.PublicKey.Key.Encrypt($EncodedBytes1, [System.Security.Cryptography.RSAEncryptionPadding]::OaepSHA256) } catch { $EncryptedBytes1 = $Cert1.PublicKey.Key.Encrypt($EncodedBytes1, [System.Security.Cryptography.RSAEncryptionPadding]::Pkcs1) } #> $EncryptedBytes1 = $Cert1.PublicKey.Key.Encrypt($EncodedBytes1, [System.Security.Cryptography.RSAEncryptionPadding]::Pkcs1) $EncryptedString1 = [System.Convert]::ToBase64String($EncryptedBytes1) $FileOutputPathSplit = $FileToOutput -split "\." $FileToOutputUpdated = $FileOutputPathSplit[0] + "_$i." + $FileOutputPathSplit[-1] + ".rsaencrypted" $EncryptedString1 | Out-File $FileToOutputUpdated $RSAEncryptedFiles += $FileToOutputUpdated } $CertLocation = if ($PathToPfxFile) { $PathToPfxFile } elseif (!$ExportPfxCertificateSuccessful) { "Cert:\LocalMachine\My" + '\' + $Cert1.Thumbprint } elseif ($ExportPfxCertificateSuccessful) { $("Cert:\LocalMachine\My" + '\' + $Cert1.Thumbprint),"$PfxOutputDir\$CertName.pfx" } [pscustomobject]@{ FilesEncryptedViaRSA = $RSAEncryptedFiles FilesEncryptedViaAES = $null OriginalFiles = $null CertficateUsedForRSAEncryption = $Cert1 LocationOfCertUsedForRSAEncryption = $CertLocation UnprotectedAESKey = $null RSAEncryptedAESKey = $null RSAEncryptedAESKeyLocation = $null AllFileOutputs = $(if ($PathToPfxFile) {$RSAEncryptedFiles} else {$RSAEncryptedFiles,"$PfxOutputDir\$CertName.pfx"}) } } if ($SourceType -eq "File") { $OriginalFileItem = Get-Item $ContentToEncrypt $OriginalFile = $OriginalFileItem.FullName $OriginalFileName = $OriginalFileItem.Name $OriginalDirectory = $OriginalFileItem.Directory # Determine if the contents of the File is too long for Asymetric RSA Encryption with pub cert and priv key #$EncodedBytes1 = Get-Content $ContentToEncrypt -Encoding Byte -ReadCount 0 $EncodedBytes1 = [System.IO.File]::ReadAllBytes($ContentToEncrypt) # If the file content is small enough, encrypt via RSA if ($EncodedBytes1.Length -lt $MaxNumberOfBytesThatCanBeEncryptedViaRSA) { #$EncryptedBytes1 = $Cert1.PublicKey.Key.Encrypt($EncodedBytes1, $true) <# try { $EncryptedBytes1 = $Cert1.PublicKey.Key.Encrypt($EncodedBytes1, [System.Security.Cryptography.RSAEncryptionPadding]::OaepSHA256) } catch { $EncryptedBytes1 = $Cert1.PublicKey.Key.Encrypt($EncodedBytes1, [System.Security.Cryptography.RSAEncryptionPadding]::Pkcs1) } #> $EncryptedBytes1 = $Cert1.PublicKey.Key.Encrypt($EncodedBytes1, [System.Security.Cryptography.RSAEncryptionPadding]::Pkcs1) $EncryptedString1 = [System.Convert]::ToBase64String($EncryptedBytes1) $EncryptedString1 | Out-File "$OriginalDirectory\$OriginalFileName.rsaencrypted" } # If the file content is too large, encrypt via AES and then Encrypt the AES Key via RSA if ($EncodedBytes1.Length -ge $MaxNumberOfBytesThatCanBeEncryptedViaRSA) { $AESKeyDir = $ContentToEncrypt | Split-Path -Parent $AESKeyFileNameSansExt = $(Get-ChildItem $ContentToEncrypt).BaseName # Copy the original file and update file name on copy to indicate it's the original Copy-Item -Path $ContentToEncrypt -Destination "$OriginalFile.original" $AESKey = NewCryptographyKey -AsPlainText $FileEncryptionInfo = EncryptFile $ContentToEncrypt $AESKey # Save $AESKey for later use in the same directory as $ContentToEncrypt # $bytes = [System.Convert]::FromBase64String($AESKey) # [System.IO.File]::WriteAllBytes("$AESKeyDir\$AESKeyFileNameSansExt.aeskey",$bytes) $FileEncryptionInfo.AESKey | Out-File "$AESKeyDir\$AESKeyFileNameSansExt.aeskey" # Encrypt the AESKey File using RSA asymetric encryption # NOTE: When Get-Content's -ReadCount is 0, all content is read in one fell swoop, so it's not an array of lines #$EncodedBytes1 = Get-Content "$AESKeyDir\$AESKeyFileNameSansExt.aeskey" -Encoding Byte -ReadCount 0 $EncodedBytes1 = [System.IO.File]::ReadAllBytes("$AESKeyDir\$AESKeyFileNameSansExt.aeskey") #$EncryptedBytes1 = $Cert1.PublicKey.Key.Encrypt($EncodedBytes1, $true) <# try { $EncryptedBytes1 = $Cert1.PublicKey.Key.Encrypt($EncodedBytes1, [System.Security.Cryptography.RSAEncryptionPadding]::OaepSHA256) } catch { $EncryptedBytes1 = $Cert1.PublicKey.Key.Encrypt($EncodedBytes1, [System.Security.Cryptography.RSAEncryptionPadding]::Pkcs1) } #> $EncryptedBytes1 = $Cert1.PublicKey.Key.Encrypt($EncodedBytes1, [System.Security.Cryptography.RSAEncryptionPadding]::Pkcs1) $EncryptedString1 = [System.Convert]::ToBase64String($EncryptedBytes1) $EncryptedString1 | Out-File "$AESKeyDir\$AESKeyFileNameSansExt.aeskey.rsaencrypted" Remove-Item "$AESKeyDir\$AESKeyFileNameSansExt.aeskey" } $FileEncryptedViaRSA = if (!$AESKey) {"$OriginalFile.rsaencrypted"} $FileEncryptedViaAES = if ($AESKey) {$FileEncryptionInfo.FilesEncryptedwAESKey} $RSAEncryptedAESKeyLocation = if ($AESKey) {"$AESKeyDir\$AESKeyFileNameSansExt.aeskey.rsaencrypted"} $RSAEncryptedFileName = if ($FileEncryptedViaRSA) {$FileEncryptedViaRSA} $AESEncryptedFileName = if ($FileEncryptedViaAES) {$FileEncryptedViaAES} $AllFileOutputsPrep = $RSAEncryptedFileName,$AESEncryptedFileName,"$OriginalFile.original",$RSAEncryptedAESKeyLocation $AllFileOutputs = $AllFileOutputsPrep | foreach {if ($_ -ne $null) {$_}} if (!$PathToPfxFile) { $AllFileOutputs = $AllFileOutputs + "$PfxOutputDir\$CertName.pfx" } $CertLocation = if ($PathToPfxFile) { $PathToPfxFile } elseif (!$ExportPfxCertificateSuccessful) { "Cert:\LocalMachine\My" + '\' + $Cert1.Thumbprint } elseif ($ExportPfxCertificateSuccessful) { $("Cert:\LocalMachine\My" + '\' + $Cert1.Thumbprint),"$PfxOutputDir\$CertName.pfx" } $RenameItemSplatParams = @{ Path = "$OriginalFile.original" NewName = $OriginalFile PassThru = $True ErrorAction = "SilentlyContinue" } $FinalOriginalFileItem = Rename-Item @RenameItemSplatParams if ($RemoveOriginalFile) { Remove-Item -Path $FinalOriginalFileItem.FullName -Force -ErrorAction SilentlyContinue } [pscustomobject]@{ FileEncryptedViaRSA = $FileEncryptedViaRSA FileEncryptedViaAES = $FileEncryptedViaAES OriginalFile = $FinalOriginalFileItem.FullName CertficateUsedForRSAEncryption = $Cert1 LocationOfCertUsedForRSAEncryption = $CertLocation UnprotectedAESKey = $(if ($AESKey) {$FileEncryptionInfo.AESKey}) RSAEncryptedAESKey = $(if ($AESKey) {$EncryptedString1}) RSAEncryptedAESKeyLocation = $RSAEncryptedAESKeyLocation AllFileOutputs = $AllFileOutputs } } if ($SourceType -eq "Directory") { if (!$Recurse) { $FilesToEncryptPrep = $(Get-ChildItem -Path $ContentToEncrypt -File).FullName } if ($Recurse) { $FilesToEncryptPrep = $(Get-ChildItem -Path $ContentToEncrypt -Recurse -File).FullName } [array]$FilesToEncryptViaRSA = @() [array]$FilesToEncryptViaAES = @() foreach ($file in $FilesToEncryptPrep) { # Determine if the contents of the File is too long for Asymetric RSA Encryption with pub cert and priv key #$EncodedBytes1 = Get-Content $file -Encoding Byte -ReadCount 0 $EncodedBytes1 = [System.IO.File]::ReadAllBytes($file) # If the file content is small enough, encrypt via RSA if ($EncodedBytes1.Length -lt $MaxNumberOfBytesThatCanBeEncryptedViaRSA) { $FilesToEncryptViaRSA += $file } if ($EncodedBytes1.Length -ge $MaxNumberOfBytesThatCanBeEncryptedViaRSA) { $FilesToEncryptViaAES += $file } } foreach ($file in $FilesToEncryptViaAES) { # Copy the original file and update file name on copy to indicate it's the original Copy-Item -Path $file -Destination "$file.original" } # Start Doing the Encryption foreach ($file in $FilesToEncryptViaRSA) { #$EncodedBytes1 = Get-Content $file -Encoding Byte -ReadCount 0 $EncodedBytes1 = [System.IO.File]::ReadAllBytes($file) #$EncryptedBytes1 = $Cert1.PublicKey.Key.Encrypt($EncodedBytes1, $true) <# try { $EncryptedBytes1 = $Cert1.PublicKey.Key.Encrypt($EncodedBytes1, [System.Security.Cryptography.RSAEncryptionPadding]::OaepSHA256) } catch { $EncryptedBytes1 = $Cert1.PublicKey.Key.Encrypt($EncodedBytes1, [System.Security.Cryptography.RSAEncryptionPadding]::Pkcs1) } #> $EncryptedBytes1 = $Cert1.PublicKey.Key.Encrypt($EncodedBytes1, [System.Security.Cryptography.RSAEncryptionPadding]::Pkcs1) $EncryptedString1 = [System.Convert]::ToBase64String($EncryptedBytes1) $EncryptedString1 | Out-File "$file.rsaencrypted" } $AESKeyDir = $ContentToEncrypt $AESKeyFileName = "$($AESKeyDir | Split-Path -Leaf).aeskey" $AESKey = NewCryptographyKey -AsPlainText $FileEncryptionInfo = EncryptFile $FilesToEncryptViaAES $AESKey # Save $AESKey for later use in the same directory as $file # $bytes = [System.Convert]::FromBase64String($AESKey) # [System.IO.File]::WriteAllBytes("$AESKeyDir\$AESKeyFileName.aeskey",$bytes) $FileEncryptionInfo.AESKey | Out-File "$AESKeyDir\$AESKeyFileName" # Encrypt the AESKey File using RSA asymetric encryption # NOTE: When Get-Content's -ReadCount is 0, all content is read in one fell swoop, so it's not an array of lines #$EncodedBytes1 = Get-Content "$AESKeyDir\$AESKeyFileName" -Encoding Byte -ReadCount 0 $EncodedBytes1 = [System.IO.File]::ReadAllBytes("$AESKeyDir\$AESKeyFileName") #$EncryptedBytes1 = $Cert1.PublicKey.Key.Encrypt($EncodedBytes1, $true) <# try { $EncryptedBytes1 = $Cert1.PublicKey.Key.Encrypt($EncodedBytes1, [System.Security.Cryptography.RSAEncryptionPadding]::OaepSHA256) } catch { $EncryptedBytes1 = $Cert1.PublicKey.Key.Encrypt($EncodedBytes1, [System.Security.Cryptography.RSAEncryptionPadding]::Pkcs1) } #> $EncryptedBytes1 = $Cert1.PublicKey.Key.Encrypt($EncodedBytes1, [System.Security.Cryptography.RSAEncryptionPadding]::Pkcs1) $EncryptedString1 = [System.Convert]::ToBase64String($EncryptedBytes1) $EncryptedString1 | Out-File "$AESKeyDir\$AESKeyFileName.rsaencrypted" Remove-Item "$AESKeyDir\$AESKeyFileName" $RSAEncryptedAESKeyLocation = if ($FilesToEncryptViaAES.Count -ge 1) {"$AESKeyDir\$AESKeyFileName.rsaencrypted"} $OriginalFilesPrep = $FilesToEncryptViaRSA + $FilesToEncryptViaAES $OriginalFiles = foreach ($file in $OriginalFilesPrep) {"$file.original"} $RSAEncryptedFileNames = foreach ($file in $FilesToEncryptViaRSA) { "$file.rsaencrypted" } $AESEncryptedFileNames = foreach ($file in $FilesToEncryptViaAES) { "$file.aesencrypted" } $AllFileOutputsPrep = $RSAEncryptedFileNames,$AESEncryptedFileNames,$OriginalFiles,$RSAEncryptedAESKeyLocation $AllFileOutputs = foreach ($element in $AllFileOutputsPrep) {if ($element -ne $null) {$element}} if (!$PathToPfxFile) { $AllFileOutputs = $AllFileOutputs + "$PfxOutputDir\$CertName.pfx" } $CertLocation = if ($PathToPfxFile) { $PathToPfxFile } elseif (!$ExportPfxCertificateSuccessful) { "Cert:\LocalMachine\My" + '\' + $Cert1.Thumbprint } elseif ($ExportPfxCertificateSuccessful) { $("Cert:\LocalMachine\My" + '\' + $Cert1.Thumbprint),"$PfxOutputDir\$CertName.pfx" } [System.Collections.ArrayList]$FinalOriginalFileItems = @() foreach ($FullFilePath in $OriginalFiles) { $RenameItemSplatParams = @{ Path = $FullFilePath NewName = $($FullFilePath -replace "\.original","") PassThru = $True ErrorAction = "SilentlyContinue" } $FinalOriginalFileItem = Rename-Item @RenameItemSplatParams $null = $FinalOriginalFileItems.Add($FinalOriginalFileItem) if ($RemoveOriginalFile) { Remove-Item -Path $FullFilePath -Force -ErrorAction SilentlyContinue } } [pscustomobject]@{ FilesEncryptedViaRSA = $RSAEncryptedFileNames FilesEncryptedViaAES = $AESEncryptedFileNames OriginalFiles = $FinalOriginalFileItems.FullName CertficateUsedForRSAEncryption = $Cert1 LocationOfCertUsedForRSAEncryption = $CertLocation UnprotectedAESKey = $FileEncryptionInfo.AESKey RSAEncryptedAESKey = $EncryptedString1 RSAEncryptedAESKeyLocation = $RSAEncryptedAESKeyLocation AllFileOutputs = $AllFileOutputs } } ##### END Main Body ##### } # 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