Desktop app signature verification section

src/content/pages/apps-linux.md

@@ -43,6 +43,9 @@ contents:
 - item:
     title: Install from Source Code
     anchor: source
+- item:
+    title: Signature Verification
+    anchor: signature-verification
 - item:
     title: Useful Links
     anchor: useful-links
@@ -178,6 +181,15 @@ SHA256: 28efe2eadd7a80a058fe2439c6fc005100b2b1ac58a6a498d27f2a981858bad4
 [Base package CLI on GitHub](https://github.com/ivpn/desktop-app-cli#linux-1)  
 [UI package on GitHub](https://github.com/ivpn/desktop-app-ui2#installation)  
 
+## Signature Verification {#signature-verification}
+
+Each Linux binary is signed by a GPG key.
+
+GPG key location:
+
+* for DEB files: `<repository path>/generic.gpg` (example: `https://repo.ivpn.net/stable/ubuntu/generic.gpg`)
+* for RPM files: `<repository path>/repo.gpg` (example: `https://repo.ivpn.net/stable/fedora/generic/repo.gpg`)
+
 ## Useful Links {#useful-links}
 
 If you prefer not to use the IVPN app please follow the relevant setup guide below.

src/content/pages/apps-macos.md

@@ -36,7 +36,7 @@ releases: [{
 - Auto-update.
 - Auto-connect on launch / on joining insecure Wi-Fi.
 
-## Manual configuration
+## Manual Configuration
 
 If you prefer not to use the IVPN app please follow the relevant setup guide below.
 
@@ -46,7 +46,26 @@ If you are using OpenVPN download the latest OpenVPN [UDP](/releases/config/ivpn
 - [Tunnelblick (OpenVPN) for macOS Setup Guide](/setup/macos-openvpn-tunnelblick/)  
 - [IPSec IKEv2 for macOS Setup Guide](/setup/macos-ipsec-with-ikev2/)   
 
-## Download legacy version
+## Signature Verification
+
+The OpenSSL public key file has to be used for verification:
+
+* `https://repo.ivpn.net/macos/keys/public.pem`
+
+Next steps should be performed, to verify the signature (example):
+
+1.  Download ‘installer' and it's signature (e.g. `https://repo.ivpn.net/macos/bin/IVPN-3.3.7.dmg` and `https://repo.ivpn.net/macos/bin/IVPN-3.3.7.dmg.sign.sha256.base64`)
+2.  Download OpenSSL public key for verification `https://repo.ivpn.net/macos/keys/public.pem`
+3.  Verification commands 
+
+    {{< highlight shell >}}
+    # Decode base64:
+    $ openssl base64 -d -in IVPN-3.3.7.dmg.sign.sha256.base64 -out IVPN-3.3.7.dmg.sign.sha256
+    # Check signature:
+    $ openssl dgst -sha256 -verify public.pem -signature IVPN-3.3.7.dmg.sign.sha256 IVPN-3.3.7.dmg
+    {{< /highlight >}}
+
+## Download Legacy Version
 
 Download [IVPN-2.12.17.dmg](https://cdn.ivpn.net/releases/osx/IVPN-2.12.17.dmg)  
 SHA256: 0fd09967482f53c801dc55eaf23a88ad341da37f58d70d9c9e24c2e5aeb36c22  

src/content/pages/apps-windows.md

@@ -36,7 +36,7 @@ releases: [{
 - Auto-update.
 - Auto-connect on launch / on joining insecure Wi-Fi.
 
-## Manual configuration
+## Manual Configuration
 
 If you prefer not to use the IVPN app please follow the relevant setup guide below.
 
@@ -47,7 +47,26 @@ If you are using OpenVPN download the latest OpenVPN [UDP](/releases/config/ivpn
 - [Windows 10 IPSec IKEv2 Setup Guide](/setup/windows-10-ipsec-with-ikev2/)  
 - [OpenVPN Manual setup for Windows 8](/setup/windows-8-openvpn-community/)  
 
-## Download legacy version
+## Signature Verification
+
+The OpenSSL public key file has to be used for verification:
+
+* `https://repo.ivpn.net/windows/keys/public.pem`
+
+Next steps should be performed, to verify the signature (example):
+
+1.  Download ‘installer' and it's signature (e.g. `https://repo.ivpn.net/windows/bin/IVPN-Client-v3.3.7.exe` and `https://repo.ivpn.net/windows/bin/IVPN-Client-v3.3.7.exe.sign.sha256.base64`)
+2.  Download OpenSSL public key for verification `https://repo.ivpn.net/windows/keys/public.pem`
+3.  Verification commands 
+
+    {{< highlight shell >}}
+    # Decode base64:
+    $ openssl base64 -d -in IVPN-Client-v3.3.7.exe.sign.sha256.base64 -out IVPN-Client-v3.3.7.exe.sign.sha256
+    # Check signature:
+    $ openssl dgst -sha256 -verify public.pem -signature IVPN-Client-v3.3.7.exe.sign.sha256 IVPN-Client-v3.3.7.exe
+    {{< /highlight >}}
+
+## Download Legacy Version
 
 Download [IVPN-2.12.17.exe](https://cdn.ivpn.net/releases/win/IVPN-Client-v2.12.17.exe)  
 SHA256: 7dce2cd90a2828f308c5c9063776d05af6074d974c57ee69a7ea79030640149a  

src/themes/ivpn-v3/assets/scss/elements/pre.scss

@@ -88,13 +88,16 @@ pre {
 
 .content--product {
 
-    pre {
-        padding: 0;
-    }
+    .highlight {
 
-    code {
-        overflow-x: auto;
-        white-space: nowrap;
-        padding: 44px 34px;
+        pre {
+            padding: 0;
+        }
+
+        code {
+            overflow-x: auto;
+            white-space: nowrap;
+            padding: 44px 34px;
+        }
     }
 }