PowerShell

Load a Private Key from a JWK

Demonstrates the Chilkat PrivateKey.LoadJwk method, which loads a private key from JWK (JSON Web Key) JSON. The only argument is the JWK JSON string. Supported key types are RSA, EC, and Ed25519 (kty=OKP).

Background: JWK is the JSON key format used throughout modern web security — JWT signing, OAuth, OpenID Connect — so this loader is what you use to consume a key from a JWK Set or an identity provider. A private JWK includes the private parameters (d and, for RSA, the CRT values); a public-only JWK omits them. As JSON in the clear, a private JWK must be handled as sensitive material.

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

$success = $false

#  Demonstrates the PrivateKey.LoadJwk method, which loads a private key from JWK (JSON Web Key)
#  JSON.  The only argument is the JWK JSON string.  Supported key types are RSA, EC, and
#  Ed25519 (kty=OKP).

$privKey = New-Object Chilkat.PrivateKey

#  A private JWK.  For a real key, "d" (and the other private parameters) would be present.
$jwk = "{`"kty`":`"EC`",`"crv`":`"P-256`",`"x`":`"...`",`"y`":`"...`",`"d`":`"...`"}"

$success = $privKey.LoadJwk($jwk)
if ($success -eq $false) {
    $($privKey.LastErrorText)
    exit
}

$("Loaded a " + $privKey.KeyType + " private key.")