PSPKI

3.4.1.0

Client/Convert-PfxToPem.ps1

                                function Convert-PfxToPem {

<#

.ExternalHelp PSPKI.Help.xml

#>

[CmdletBinding(DefaultParameterSetName = '__pfxfile')]

    param(

        [Parameter(Mandatory = $true, ParameterSetName = '__pfxfile', Position = 0)]

        [IO.FileInfo]$InputFile,

        [Parameter(Mandatory = $true, ParameterSetName = '__cert', Position = 0)]

        [Security.Cryptography.X509Certificates.X509Certificate2]$Certificate,

        [Parameter(Mandatory = $true, ParameterSetName = '__pfxfile', Position = 1)]

        [Security.SecureString]$Password,

        [Parameter(Mandatory = $true, Position = 2)]

        [IO.FileInfo]$OutputFile,

        [Parameter(Position = 3)]

        [ValidateSet("Pkcs1","Pkcs8")]

        [string]$OutputType = "Pkcs8",

        [switch]$IncludeChain

    )

$signature = @"

[DllImport("crypt32.dll", CharSet=CharSet.Auto, SetLastError=true)]

public static extern bool CryptAcquireCertificatePrivateKey(

    IntPtr pCert,

    uint dwFlags,

    IntPtr pvReserved,

    ref IntPtr phCryptProv,

    ref uint pdwKeySpec,

    ref bool pfCallerFreeProv

);

[DllImport("advapi32.dll", CharSet=CharSet.Auto, SetLastError=true)]

public static extern bool CryptGetUserKey(

    IntPtr hProv,

    uint dwKeySpec,

    ref IntPtr phUserKey

);

[DllImport("advapi32.dll", CharSet=CharSet.Auto, SetLastError=true)]

public static extern bool CryptExportKey(

    IntPtr hKey,

    IntPtr hExpKey,

    uint dwBlobType,

    uint dwFlags,

    byte[] pbData,

    ref uint pdwDataLen

);

[DllImport("advapi32.dll", CharSet=CharSet.Auto, SetLastError=true)]

public static extern bool CryptDestroyKey(

    IntPtr hKey

);

[DllImport("crypt32.dll", SetLastError = true, CharSet = CharSet.Auto)]

public static extern bool PFXIsPFXBlob(

    CRYPTOAPI_BLOB pPFX

);

[DllImport("crypt32.dll", SetLastError = true, CharSet = CharSet.Auto)]

public static extern bool PFXVerifyPassword(

    CRYPTOAPI_BLOB pPFX,

    [MarshalAs(UnmanagedType.LPWStr)]

    string szPassword,

    int dwFlags

);

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]

public struct CRYPTOAPI_BLOB {

    public int cbData;

    public IntPtr pbData;

}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]

public struct PUBKEYBLOBHEADERS {

    public byte bType;

    public byte bVersion;

    public short reserved;

    public uint aiKeyAlg;

    public uint magic;

    public uint bitlen;

    public uint pubexp;

 }

"@

    Add-Type -MemberDefinition $signature -Namespace PKI -Name PfxTools

#region helper functions

    function Encode-Integer ([Byte[]]$RawData) {

        # since CryptoAPI is little-endian by nature, we have to change byte ordering

        # to big-endian.

        [array]::Reverse($RawData)

        # if high byte contains more than 7 bits, an extra zero byte is added

        if ($RawData[0] -ge 128) {$RawData = ,0 + $RawData}

        [SysadminsLV.Asn1Parser.Asn1Utils]::Encode($RawData, 2)

    }

#endregion

#region parameterset processing

    switch ($PsCmdlet.ParameterSetName) {

        "__pfxfile" {

            $bytes = [IO.File]::ReadAllBytes($InputFile)

            $ptr = [Runtime.InteropServices.Marshal]::AllocHGlobal($bytes.Length)

            [Runtime.InteropServices.Marshal]::Copy($bytes,0,$ptr,$bytes.Length)

            $pfx = New-Object PKI.PfxTools+CRYPTOAPI_BLOB -Property @{

                cbData = $bytes.Length;

                pbData = $ptr

            }

            # just check whether input file is valid PKCS#12/PFX file.

            if ([PKI.PfxTools]::PFXIsPFXBlob($pfx)) {

                $certs = New-Object Security.Cryptography.X509Certificates.X509Certificate2Collection

                try {

                    $certs.Import(

                        $bytes,

                        [Runtime.InteropServices.Marshal]::PtrToStringAuto([Runtime.InteropServices.Marshal]::SecureStringToBSTR($Password)),

                        "Exportable"

                    )

                    $Certificate = ($certs | Where-Object {$_.HasPrivateKey})[0]

                } catch {

                    throw $_

                    return

                } finally {

                    [Runtime.InteropServices.Marshal]::FreeHGlobal($ptr)

                    Remove-Variable bytes, ptr, pfx -Force

                }

            } else {

                [Runtime.InteropServices.Marshal]::FreeHGlobal($ptr)

                Remove-Variable bytes, ptr, pfx -Force

                Write-Error -Category InvalidData -Message "Input file is not valid PKCS#12/PFX file." -ErrorAction Stop

            }

        }

        "__cert" {

            if (!$Certificate.HasPrivateKey) {

                Write-Error -Category InvalidOperation -Message "Specified certificate object does not contain associated private key." -ErrorAction Stop

            }

        }

    }

#endregion

#region constants

    $CRYPT_ACQUIRE_SILENT_FLAG = 0x40

    $PRIVATEKEYBLOB = 0x7

    $CRYPT_OAEP = 0x40

#endregion

#region private key export routine

    $phCryptProv = [IntPtr]::Zero

    $pdwKeySpec = 0

    $pfCallerFreeProv = $false

    # attempt to acquire private key container

    if (![PKI.PfxTools]::CryptAcquireCertificatePrivateKey($Certificate.Handle,$CRYPT_ACQUIRE_SILENT_FLAG,0,[ref]$phCryptProv,[ref]$pdwKeySpec,[ref]$pfCallerFreeProv)) {

        throw New-Object ComponentModel.Win32Exception ([Runtime.InteropServices.Marshal]::GetLastWin32Error())

        return

    }

    $phUserKey = [IntPtr]::Zero

    # attempt to acquire private key handle

    if (![PKI.PfxTools]::CryptGetUserKey($phCryptProv,$pdwKeySpec,[ref]$phUserKey)) {

        throw New-Object ComponentModel.Win32Exception ([Runtime.InteropServices.Marshal]::GetLastWin32Error())

        return

    }

    $pdwDataLen = 0

    # attempt to export private key. This method fails if certificate has non-exportable private key.

    if (![PKI.PfxTools]::CryptExportKey($phUserKey,0,$PRIVATEKEYBLOB,$CRYPT_OAEP,$null,[ref]$pdwDataLen)) {

        throw New-Object ComponentModel.Win32Exception ([Runtime.InteropServices.Marshal]::GetLastWin32Error())

        return

    }

    $pbytes = New-Object byte[] -ArgumentList $pdwDataLen

    [void][PKI.PfxTools]::CryptExportKey($phUserKey,0,$PRIVATEKEYBLOB,$CRYPT_OAEP,$pbytes,[ref]$pdwDataLen)

    # release private key handle

    [void][PKI.PfxTools]::CryptDestroyKey($phUserKey)

#endregion

#region private key blob splitter

    # extracting private key blob header.

    $headerblob = $pbytes[0..19]

    # extracting actual private key data exluding header.

    $keyblob = $pbytes[20..($pbytes.Length - 1)]

    Remove-Variable pbytes -Force

    # public key structure header has fixed length: 20 bytes: http://msdn.microsoft.com/en-us/library/aa387689(VS.85).aspx

    # copy header information to unmanaged memory and copy it to structure.

    $ptr = [Runtime.InteropServices.Marshal]::AllocHGlobal(20)

    [Runtime.InteropServices.Marshal]::Copy($headerblob,0,$ptr,20)

    $header = [Runtime.InteropServices.Marshal]::PtrToStructure($ptr,[Type][PKI.PfxTools+PUBKEYBLOBHEADERS])

    [Runtime.InteropServices.Marshal]::FreeHGlobal($ptr)

    # extract public exponent from blob header and convert it to a byte array

    $pubExponentHex = "{0:x2}" -f $header.pubexp

    if ($pubExponentHex.Length % 2) {$pubExponentHex = "0" + $pubExponentHex}

    $publicExponent = $pubExponentHex -split "([a-f0-9]{2})" | Where-Object {$_} | ForEach-Object {[Convert]::ToByte($_,16)}

    # this object is created to reduce code size. This object has properties, where each property represents

    # a part (component) of the private key and property value contains private key component length.

    # 8 means that the length of the component is KeyLength / 8. Resulting length is measured in bytes.

    # for details see private key structure description: http://msdn.microsoft.com/en-us/library/aa387689(VS.85).aspx

    $obj = New-Object psobject -Property @{

        modulus = 8; privateExponent = 8;

        prime1 = 16; prime2 = 16; exponent1 = 16; exponent2 = 16; coefficient = 16;

    }

    $offset = 0

    # I pass variable names (each name represents the component of the private key) to foreach loop

    # in the order as they follow in the private key structure and parse private key for

    # appropriate offsets and write component information to variable.

    "modulus","prime1","prime2","exponent1","exponent2","coefficient","privateExponent" | ForEach-Object {

        Set-Variable -Name $_ -Value ($keyblob[$offset..($offset + $header.bitlen / $obj.$_ - 1)])

        $offset = $offset + $header.bitlen / $obj.$_

    }

    # PKCS#1/PKCS#8 uses slightly different component order, therefore I reorder private key

    # components and pass them to a simplified ASN encoder.

    $asnblob = Encode-Integer 0

    $asnblob += "modulus","publicExponent","privateExponent","prime1","prime2","exponent1","exponent2","coefficient" | ForEach-Object {

        Encode-Integer (Get-Variable -Name $_).Value

    }

    # remove unused variables

    Remove-Variable modulus,publicExponent,privateExponent,prime1,prime2,exponent1,exponent2,coefficient -Force

    # encode resulting set of INTEGERs to a SEQUENCE

    $asnblob = [SysadminsLV.Asn1Parser.Asn1Utils]::Encode($asnblob, 48)

    # $out variable just holds output file. The file will contain private key and public certificate

    # each will be enclosed with header and footer.

    $out = New-Object Text.StringBuilder

    if ($OutputType -eq "Pkcs8") {

        $asnblob = [SysadminsLV.Asn1Parser.Asn1Utils]::Encode($asnblob, 4)

        $algid = [Security.Cryptography.CryptoConfig]::EncodeOID("1.2.840.113549.1.1.1") + 5,0

        $algid = [SysadminsLV.Asn1Parser.Asn1Utils]::Encode($algid, 48)

        $asnblob = 2,1,0 + $algid + $asnblob

        $asnblob = [SysadminsLV.Asn1Parser.Asn1Utils]::Encode($asnblob, 48)

        $base64 = [SysadminsLV.Asn1Parser.AsnFormatter]::BinaryToString($asnblob,"Base64").Trim()

        [void]$out.AppendFormat("{0}{1}", "-----BEGIN PRIVATE KEY-----", [Environment]::NewLine)

        [void]$out.AppendFormat("{0}{1}", $base64, [Environment]::NewLine)

        [void]$out.AppendFormat("{0}{1}", "-----END PRIVATE KEY-----", [Environment]::NewLine)

    } else {

        # PKCS#1 requires RSA identifier in the header.

        # PKCS#1 is an inner structure of PKCS#8 message, therefore no additional encodings are required.

        $base64 = [SysadminsLV.Asn1Parser.AsnFormatter]::BinaryToString($asnblob,"Base64").Trim()

        [void]$out.AppendFormat("{0}{1}", "-----BEGIN RSA PRIVATE KEY-----", [Environment]::NewLine)

        [void]$out.AppendFormat("{0}{1}", $base64, [Environment]::NewLine)

        [void]$out.AppendFormat("{0}{1}", "-----END RSA PRIVATE KEY-----", [Environment]::NewLine)

    }

    $base64 = [SysadminsLV.Asn1Parser.AsnFormatter]::BinaryToString($Certificate.RawData,"Base64Header")

    $out.Append($base64)

    if ($IncludeChain) {

        $chain = New-Object Security.Cryptography.X509Certificates.X509Chain

        $chain.ChainPolicy.RevocationMode = "NoCheck"

        if ($certs) {

            $chain.ChainPolicy.ExtraStore.AddRange($certs)

        }

        [void]$chain.Build($Certificate)

        for ($n = 1; $n -lt $chain.ChainElements.Count; $n++) {

            $base64 = [SysadminsLV.Asn1Parser.AsnFormatter]::BinaryToString($chain.ChainElements[$n].Certificate.RawData,"Base64Header")

            $out.Append($base64)

        }

    }

    [IO.File]::WriteAllLines($OutputFile,$out.ToString())

#endregion

}

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