1 files changed, 31 insertions, 0 deletions
diff --git a/coin/provisioning/common/helpers.ps1 b/coin/provisioning/common/helpers.ps1
new file mode 100644
index 00000000..f517e94d
--- /dev/null
+++ b/coin/provisioning/common/helpers.ps1
@@ -0,0 +1,31 @@
+function Verify-Checksum
+{
+    Param (
+        [string]$File=$(throw("You must specify a filename to get the checksum of.")),
+        [string]$Expected=$(throw("Checksum required")),
+        [ValidateSet("sha1","md5")][string]$Algorithm="sha1"
+    )
+    $fs = new-object System.IO.FileStream $File, "Open"
+    $algo = [type]"System.Security.Cryptography.$Algorithm"
+    $crypto = $algo::Create()
+    $hash = [BitConverter]::ToString($crypto.ComputeHash($fs)).Replace("-", "")
+    $fs.Close()
+    if ($hash -ne $Expected) {
+        Write-Error "Checksum verification failed, got: '$hash' expected: '$Expected'"
+    }
+}
+
+function Extract-Zip
+{
+    Param (
+        [string]$Source,
+        [string]$Destination
+    )
+    echo "Extracting '$Source' to '$Destination'..."
+
+    New-Item -ItemType Directory -Force -Path $Destination
+    $shell = new-object -com shell.application
+    $zipfile = $shell.Namespace($Source)
+    $destinationFolder = $shell.Namespace($Destination)
+    $destinationFolder.CopyHere($zipfile.Items())
+}