Add Gpg4win Post

src/content/posts/windows-yubikey-guide/gpg4win.md

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+title = "Setting up Gpg4win for Yubikey 5 NFC"
+tags = ["security","windows","gpg",]
+date = "2022-11-03"
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+
+# Table of Contents
+{{< table_of_contents >}}
+
+### Step 1: Setup Gpg4win
+
+To Install Gpg4win, Run the following commands with administrative permissions.
+```ps
+winget install GnuPG.Gpg4win
+```
+
+Now to add Gpg4win to your system Path
+
+```ps
+[Environment]::SetEnvironmentVariable("Path", [Environment]::GetEnvironmentVariable("Path",[System.EnvironmentVariableTarget]::Machine) + ';' + ${Env:ProgramFiles(x86)} + '\GnuPG\bin', [System.EnvironmentVariableTarget]::Machine)
+```
+
+### Step 2: Generate a Master Key
+```ps
+gpg --expert --full-gen-key
+    > Press 8: Use RSA (set your own capabilities)
+    > Press E: Toggle the encrypt capability
+```
+You should see the following: 
+**`Current allowed actions: Sign Certify`**
+
+Now Press Q
+Set the KeySize to 2048
+
+Note: Keep a hold/note of the master's PubID and set it as a variable, such as
+```ps
+$masterKey = "312CA36A885761C43FB25C20DF1554D14ACB4423"
+```
+
+### Step 3: Generate a Revocation Cert
+```ps
+gpg --gen-revoke $masterKey > master-revocation-cert.asc
+    > Enter Y
+    > Enter 3: "Key is no longer used"
+    > Enter a description of what the cert is for, Such as
+    "Using revocation certificate, It is very likely that I have lost access to the private key."
+```
+
+### Step 3.1: Generate an Encryption Key
+```ps
+gpg --edit-key $masterKey
+    > Type: addkey
+    > Select 6: RSA (encrypt only)
+    > Set keysize to 2048
+    > Type: save
+```
+
+### Step 3.2: Create a backup of your Secret key
+```ps
+gpg --export-secret-key --armor $masterKey > gpg-secret-key.pgp
+```
+
+### Step 4: Create Signature and Authentication keys for Yubikey 
+**Note: you will want to delete and reimport your master for every Yubikey you want to use.**
+```ps
+gpg --delete-secret-key $masterKey
+gpg --import ./gpg-secret-key.pgp
+```
+
+```ps
+gpg --edit-key $masterKey
+    > Type: addcardkey
+    > Select 1 (Signature key)
+    > Enter your PIN
+    > Follow the prompts
+    > Enter your Admin Pin
+
+    > Type: addcardkey
+    > Select 3: (Authentication key)
+    > Follow the prompts
+```
+
+Now to Write the keys to Yubikey.
+```ps
+    > Type: toggle
+    > Type: key 1
+    > Type: keytocard
+    > Select 2: (Encryption key)
+    > Type: save
+``` 
+
+### Optional 1: Setup Commit signing for Git
+```ps
+git config --global --unset gpg.format
+git config --global gpg.program "C:\Program Files (x86)\GnuPG\bin\gpg.exe"
+gpg --list-secret-keys --keyid-format=long
+    > Select the ssb key with [S]
+    > type: git config --global user.signingkey E5148A9E88F8A95F! 
+```
+
+
+### Optional 1: Generate a Pubkey for verification
+```ps
+gpg --armor --export $masterKey > gpg-pub.asc
+```
+
+### Optional 1.1: Make your Pubkey public.
+```ps
+gpg --keyserver keys.openpgp.org --send-key $masterKey  
+```
+
+### Optional 2: Force touch on Yubikey actions.
+```ps
+ykman openpgp set-touch aut off
+ykman openpgp set-touch sig on
+ykman openpgp set-touch enc on
+```
+
+
+Note: To fully reset GPG Keys on the Yubikey, do the following:
+```
+ykman openpgp reset
+```
+
+Default Pin: 123456
+Default Admin Pin: 12345678
+
+gpg --card-edit
+>admin
+>name