Azure KeyVault signing

This component will calculate SHA-hash for your message and then sign that with Azure KeyVault.

Pre-conditions:

• Install Azure CLI:

 powershell Invoke-WebRequest -Uri https://aka.ms/installazurecliwindows -OutFile .\AzureCLI.msi; Start-Process msiexec.exe -Wait -ArgumentList '/I AzureCLI.msi /quiet'; rm .\AzureCLI.msi

• Create an Azure Key Vault: https://azure.microsoft.com/en-gb/services/key-vault/
• Add a certificate in the Certificates-tab of the key vault.
• From Access policies -tab, add a user. Add permissions to Sign -operation. Add permissions to Verify-operation.
• The code is using just DefaultAzureCredential(), so you have to have your environmentconfiguration for that correct. In development you may haveto do az login. See: https://docs.microsoft.com/en-us/dotnet/api/overview/azure/identity-readme#defaultazurecredential

Then just reference this library and call:

KeyVault.sign "keyvault" "certificateName" "Hello world!"

By default the library uses SHA256 and UTF8, but you can modify that, and change the Azure authentication:

KeyVault.configureAlgorithm <- KeyVault.Algorithms.SHA384
KeyVault.configureEncoding <- System.Text.Encoding.Unicode
let changeDefaultCredentials =
    KeyVault.configureAzureCredentials <- fun() ->
        Azure.Identity.DefaultAzureCredential (
            Azure.Identity.DefaultAzureCredentialOptions (
                    //ExcludeEnvironmentCredential = true
                    //,ExcludeManagedIdentityCredential = true
                    ExcludeSharedTokenCacheCredential = true
                    ,ExcludeVisualStudioCredential = true
                    //,ExcludeVisualStudioCodeCredential = true
                    //,ExcludeAzureCliCredential = true
                    //,ExcludeInteractiveBrowserCredential = true
                ))