(PowerShell) Get an EC Key in Raw Hex Format

Demonstrates how to get the private and public key parts of an EC (ECDSA) key in lowercase hex formmat.

Note: This example requires Chilkat v9.5.0.83 or greater.

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

# This example assumes the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

# Load an EC key from some format..
$privKey = New-Object Chilkat.PrivateKey

# This loads an ECDSA key from an unencrypted PEM file (no password required).
$success = $privKey.LoadAnyFormatFile("qa_data/ecc/openssl_ecc_privKey.pem","")
if ($success -eq $false) {
    $($privKey.LastErrorText)
    exit
}

# The key type should be "ecc" to indicate an EC key.
$("key type = " + $privKey.KeyType)

# What is the size of the private key in bits?
$("size in bits = " + $privKey.BitLength)

# Get the private and public EC key parts in raw hex format:
$sbPubKeyHex = New-Object Chilkat.StringBuilder
$privKeyHex = $privKey.GetRawHex($sbPubKeyHex)

# If the private key size in bits is 256, then we should have a 32-byte key (a 64 character hex string).
$("private key = " + $privKeyHex)

# The public key is composed of the "x" and "y" parts, and is composed like this:  04||HEX(x)||HEX(y)
$("public key = " + $sbPubKeyHex.GetAsString())

# Sample output:
# key type = ecc
# size in bits = 256
# private key = ced36f2ba3332be439f79143d69937fc52494cd38e45243c3ea05db183919f1b
# public key = 045b4edcd501831740895f5907feabb71587076a6314d9d5141f9f8c33a478b8ce08b8dfd2a091eb6355803d7e729876c790bc0b176f2015f3bb103813753f676a