Keybox.xml

| Approach | Reliability | Effort | |----------|-------------|--------| | | Medium (decreasing) | Low | | Kernel-level signature spoofing (e.g., PixelXpert) | Low (requires patching) | High | | Custom ROM with valid signed keys (e.g., official GrapheneOS) | High | None (reflash) | | MicroG with device registration (no keybox) | Medium (limited apps) | Medium | 7. Sample Script to Validate Keybox Format #!/bin/bash # check_keybox.sh – validates XML structure and cert chain if [ ! -f "$1" ]; then echo "Usage: $0 keybox.xml" exit 1 fi Check well-formed XML xmllint --noout "$1" if [ $? -ne 0 ]; then echo "❌ Invalid XML" exit 1 fi Extract first certificate cert=$(grep -A 1000 "BEGIN CERTIFICATE" "$1" | head -20) Check expiry echo "$cert" | openssl x509 -noout -dates 2>/dev/null || echo "⚠️ Could not parse cert"