MSIdentityTools

2.0.3

internal/Confirm-JsonWebSignature.ps1

                                <#

.SYNOPSIS

    Validate the digital signature for JSON Web Signature.

.EXAMPLE

    PS C:\>Confirm-JsonWebSignature $Base64JwsString -SigningCertificate $SigningCertificate

    Validate the JWS string was signed by provided certificate.

.INPUTS

    System.String

#>

function Confirm-JsonWebSignature {

    [CmdletBinding()]

    [Alias('Confirm-Jws')]

    [OutputType([bool])]

    param (

        # JSON Web Signature (JWS)

        [Parameter(Mandatory = $true, Position = 0, ValueFromPipeline = $true)]

        [string[]] $InputObjects,

        # Certificate used to sign the data

        [Parameter(Mandatory = $true)]

        [System.Security.Cryptography.X509Certificates.X509Certificate2] $SigningCertificate

    )

    process {

        foreach ($InputObject in $InputObjects) {

            $Jws = ConvertFrom-JsonWebSignature $InputObject

            $JwsData = $InputObject.Substring(0, $InputObject.LastIndexOf('.'))

            [Security.Cryptography.HashAlgorithmName] $HashAlgorithm = [Security.Cryptography.HashAlgorithmName]::"SHA$($Jws.Header.alg.Substring(2,3))"

            switch ($Jws.Header.alg.Substring(0, 2)) {

                'RS' {

                    $RSAKey = [System.Security.Cryptography.X509Certificates.RSACertificateExtensions]::GetRSAPublicKey($SigningCertificate)

                    [bool] $Result = $RSAKey.VerifyData([System.Text.Encoding]::UTF8.GetBytes($JwsData), $Jws.Signature, $HashAlgorithm, [Security.Cryptography.RSASignaturePadding]::Pkcs1)

                }

                'PS' {

                    $RSAKey = [System.Security.Cryptography.X509Certificates.RSACertificateExtensions]::GetRSAPublicKey($SigningCertificate)

                    [bool] $Result = $RSAKey.VerifyData([System.Text.Encoding]::UTF8.GetBytes($JwsData), $Jws.Signature, $HashAlgorithm, [Security.Cryptography.RSASignaturePadding]::Pss)

                }

                'ES' {

                    $ECDsaKey = [System.Security.Cryptography.X509Certificates.ECDsaCertificateExtensions]::GetECDsaPublicKey($SigningCertificate)

                    [bool] $Result = $ECDsaKey.VerifyData([System.Text.Encoding]::UTF8.GetBytes($JwsData), $Jws.Signature, $HashAlgorithm)

                }

            }

            Write-Output $Result

        }

    }

}

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