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(PowerShell) DSA Signature Create and Verify

Shows how to create a DSA (DSS) signature for the contents of a file. The first step is to create an SHA-1 hash of the file contents. The hash is signed using the Digital Signature Algorithm and the signature bytes are retrieved as a hex-encoded string.

The 2nd part of the example loads the signature and verifies it against the hash.

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[Reflection.Assembly]::LoadFile("C:\myAssemblies\ChilkatDotNet2.dll")



#  Use Chilkat Crypt to hash the contents of a file.
#  This unlocks both the crypt and DSA objects..
$crypt = New-Object Chilkat.Crypt2
$success = $crypt.UnlockComponent("Anything for 30-day trial.")
if ($success -ne $true) {
    $($crypt.LastErrorText)
    exit
}

$crypt.EncodingMode = "hex"
$crypt.HashAlgorithm = "sha-1"

#  Return the SHA-1 hash of a file.  The file may be any size.
#  The Chilkat Crypt component will stream the file when
#  computing the hash, keeping the memory usage constant
#  and reasonable.
#  The 20-byte SHA-1 hash is returned as a hex-encoded string.
$hashStr = $crypt.HashFileENC("hamlet.xml")

$dsa = New-Object Chilkat.Dsa

#  Load a DSA private key from a PEM file.  Chilkat DSA
#  provides the ability to load and save DSA public and private
#  keys from encrypted or non-encrypted PEM or DER.
#  The LoadText method is for convenience only.  You may
#  use any means to load the contents of a PEM file into
#  a string.

$pemPrivateKey = $dsa.LoadText("dsa_priv.pem")
$success = $dsa.FromPem($pemPrivateKey)
if ($success -ne $true) {
    $($dsa.LastErrorText)
    exit
}

#  You may optionally verify the key to ensure that it is a valid
#  DSA key.
$success = $dsa.VerifyKey()
if ($success -ne $true) {
    $($dsa.LastErrorText)
    exit
}

#  Load the hash to be signed into the DSA object:
$success = $dsa.SetEncodedHash("hex",$hashStr)
if ($success -ne $true) {
    $($dsa.LastErrorText)
    exit
}

#  Now that the DSA object contains both the private key and hash,
#  it is ready to create the signature:
$success = $dsa.SignHash()
if ($success -ne $true) {
    $($dsa.LastErrorText)
    exit
}

#  If SignHash is successful, the DSA object contains the
#  signature.  It may be accessed as a hex or base64 encoded
#  string.  (It is also possible to access directly in byte array form via
#  the "Signature" property.)
$hexSig = $dsa.GetEncodedSignature("hex")
$("Signature:")
$($hexSig)

#  -----------------------------------------------------------
#  Step 2: Verify the DSA Signature
#  -----------------------------------------------------------

$dsa2 = New-Object Chilkat.Dsa

#  Load the DSA public key to be used for verification:

$pemPublicKey = $dsa2.LoadText("dsa_pub.pem")
$success = $dsa2.FromPublicPem($pemPublicKey)
if ($success -ne $true) {
    $($dsa2.LastErrorText)
    exit
}

#  Load the hash to be verified against the signature.
$success = $dsa2.SetEncodedHash("hex",$hashStr)
if ($success -ne $true) {
    $($dsa2.LastErrorText)
    exit
}

#  Load the signature:
$success = $dsa2.SetEncodedSignature("hex",$hexSig)
if ($success -ne $true) {
    $($dsa2.LastErrorText)
    exit
}

#  Verify:
$success = $dsa2.Verify()
if ($success -ne $true) {
    $($dsa2.LastErrorText)
}
else {
    $("DSA Signature Verified!")
}


 

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