(PowerShell) Load EC Public Key from X,Y Values

Demonstrates how to load an EC public key from X and Y values.

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"



# We have the following x and y values in base64 (for an EC point on the P-256 curve).
$x = "Dn7uB1O7kgk74G6qfQwFJESeDnxO6lLjGZFWZJE16tw"
$y = "iOWA5DInzK6nuUGvHJbMVq1Dpj248FqSV2teN3HzmhU"

# Build a JWK that looks like this:

# {
#   "kty": "EC",
#   "crv": "P-256",
#   "x": "Dn7uB1O7kgk74G6qfQwFJESeDnxO6lLjGZFWZJE16tw",
#   "y": "iOWA5DInzK6nuUGvHJbMVq1Dpj248FqSV2teN3HzmhU"
# }

$json = New-Object Chilkat.JsonObject
$json.UpdateString("kty","EC")
$json.UpdateString("crv","P-256")
$json.UpdateString("x",$x)
$json.UpdateString("y",$y)

# Load from the JWK.
$pubkey = New-Object Chilkat.PublicKey
$success = $pubkey.LoadFromString($json.Emit())
if ($success -eq $false) {
    $($pubkey.LastErrorText)
    exit
}

$("Success.")