seedpgp-web/README.md

# SeedPGP v1.4.3

**Secure BIP39 mnemonic backup using PGP encryption and QR codes**

A client-side web app for encrypting cryptocurrency seed phrases with OpenPGP and encoding them as QR-friendly Base45 frames with CRC16 integrity checking.

**Live App:** <https://seedpgp-web.pages.dev>

## Features

- 🔐 **PGP Encryption**: Uses cv25519 (Curve25519) for modern elliptic curve cryptography
- 📱 **QR Code Ready**: Base45 encoding optimized for QR code generation
- ✅ **Integrity Checking**: CRC16-CCITT-FALSE checksums prevent corruption
- 🔑 **BIP39 Support**: Full support for 12/18/24-word mnemonics with passphrase indicator
- 🧪 **Battle-Tested**: Validated against official Trezor BIP39 test vectors
- ⚡ **Fast**: Built with Bun runtime and Vite for optimal performance
- 🔒 **Session-Key Encryption**: Ephemeral AES-GCM-256 encryption for in-memory protection
- 🛡️ **CSP Enforcement**: Real Content Security Policy headers block all network requests
- 📸 **QR Scanner**: Camera and file upload support for scanning encrypted QR codes
- 👁️ **Security Monitoring**: Real-time storage monitoring and clipboard tracking

## Installation

```bash
# Clone repository
git clone https://github.com/kccleoc/seedpgp-web.git
cd seedpgp-web

# Install dependencies
bun install

# Run tests
bun test

# Start development server
bun run dev
```

## Usage

### Web Interface

Visit <https://seedpgp-web.pages.dev> or run locally:

```bash
bun run dev
# Open http://localhost:5173
```

**Backup Flow:**

1. Enter your BIP39 mnemonic (12/18/24 words)
2. Import PGP public key or set encryption password
3. Click "Backup" to encrypt and generate QR code
4. Save/print QR code for offline storage

**Restore Flow:**

1. Scan QR code or paste encrypted text
2. Import PGP private key or enter password
3. Click "Restore" to decrypt mnemonic
4. Mnemonic auto-clears after 10 seconds

### API Usage

```typescript
import { encryptToSeedPgp, buildPlaintext } from "./lib/seedpgp";

const mnemonic = "legal winner thank year wave sausage worth useful legal winner thank yellow";
const plaintext = buildPlaintext(mnemonic, false); // false = no BIP39 passphrase used

const result = await encryptToSeedPgp({
  plaintext,
  publicKeyArmored: yourPgpPublicKey,
});

console.log(result.framed); // SEEDPGP1:0:ABCD:BASE45DATA...
console.log(result.recipientFingerprint); // Key fingerprint for verification
```

### Decrypt a SeedPGP Frame

```typescript
import { decryptSeedPgp } from "./lib/seedpgp";

const decrypted = await decryptSeedPgp({
  frameText: "SEEDPGP1:0:ABCD:BASE45DATA...",
  privateKeyArmored: yourPrivateKey,
  privateKeyPassphrase: "your-key-password",
});

console.log(decrypted.w); // Recovered mnemonic
console.log(decrypted.pp); // BIP39 passphrase indicator (0 or 1)
```

## Deployment

**Production:** Cloudflare Pages (auto-deploys from `main` branch)  
**Live URL:** <https://seedpgp-web.pages.dev>

### Cloudflare Pages Setup

This project is deployed on Cloudflare Pages for enhanced security features:

1. **Repository:** `seedpgp-web` (private repo)
2. **Build command:** `bun run build`
3. **Output directory:** `dist/`
4. **Security headers:** Automatically enforced via `public/_headers`

### Benefits Over GitHub Pages

- ✅ Real CSP header enforcement (blocks network requests at browser level)
- ✅ Custom security headers (X-Frame-Options, X-Content-Type-Options)
- ✅ Auto-deploy on push to main
- ✅ Build preview for PRs
- ✅ Better performance (global CDN)
- ✅ Cost: $0/month

### Deployment Workflow

```bash
# Commit feature
git add src/
git commit -m "feat(v1.x): description"

# Tag version (triggers auto-deploy to Cloudflare)
git tag v1.x.x
git push origin main --tags
```

**No manual deployment needed!** Cloudflare Pages auto-deploys when you push to `main`.

## Frame Format

```
SEEDPGP1:FRAME:CRC16:BASE45DATA

SEEDPGP1 - Protocol identifier and version
0        - Frame number (0 = single frame)
ABCD     - 4-digit hex CRC16-CCITT-FALSE checksum
BASE45   - Base45-encoded PGP message
```

## API Reference

### `buildPlaintext(mnemonic, bip39PassphraseUsed, recipientFingerprints?)`

Creates a SeedPGP plaintext object.

**Parameters:**

- `mnemonic` (string): BIP39 mnemonic phrase (12/18/24 words)
- `bip39PassphraseUsed` (boolean): Whether a BIP39 passphrase was used
- `recipientFingerprints` (string[]): Optional array of recipient key fingerprints

**Returns:** `SeedPgpPlaintext` object

### `encryptToSeedPgp(params)`

Encrypts a plaintext object to SeedPGP format.

**Parameters:**

```typescript
{
  plaintext: SeedPgpPlaintext;
  publicKeyArmored?: string;      // PGP public key (PKESK)
  messagePassword?: string;        // Symmetric password (SKESK)
}
```

**Returns:**

```typescript
{
  framed: string;                  // SEEDPGP1 frame
  pgpBytes: Uint8Array;            // Raw PGP message
  recipientFingerprint?: string;   // Key fingerprint
}
```

### `decryptSeedPgp(params)`

Decrypts a SeedPGP frame.

**Parameters:**

```typescript
{
  frameText: string;                // SEEDPGP1 frame
  privateKeyArmored?: string;       // PGP private key
  privateKeyPassphrase?: string;    // Key unlock password
  messagePassword?: string;         // SKESK password
}
```

**Returns:** `SeedPgpPlaintext` object

## Testing

```bash
# Run all tests
bun test

# Run with verbose output
bun test --verbose

# Watch mode (auto-rerun on changes)
bun test --watch
```

### Test Coverage

- ✅ 15 comprehensive tests
- ✅ 8 official Trezor BIP39 test vectors
- ✅ Edge cases (wrong key, wrong passphrase)
- ✅ Frame format validation
- ✅ CRC16 integrity checking

## Security Considerations

### ✅ Best Practices

- Uses **AES-256** for symmetric encryption
- **cv25519** provides ~128-bit security level
- **CRC16** detects QR scan errors (not cryptographic)
- Key fingerprint validation prevents wrong-key usage
- **Session-key encryption**: Ephemeral AES-GCM-256 for in-memory protection
- **CSP headers**: Browser-enforced network blocking via Cloudflare Pages

### ⚠️ Important Notes

- **Never share your private key or encrypted QR codes publicly**
- Store backup QR codes in secure physical locations (safe, safety deposit box)
- Use a strong PGP key passphrase (20+ characters)
- Test decryption immediately after generating backups
- Consider password-only (SKESK) encryption as additional fallback

### 🔒 Production Deployment Warning

The Cloudflare Pages deployment at **<https://seedpgp-web.pages.dev>** is for:

- ✅ Personal use with enhanced security
- ✅ CSP enforcement blocks all network requests
- ✅ Convenient access from any device
- ⚠️ Always verify the URL before use

For maximum security with real funds:

- Run locally: `bun run dev`
- Or self-host on your own domain with HTTPS
- Use an airgapped device for critical operations

### Threat Model (Honest)

**What we protect against:**

- Accidental persistence to localStorage/sessionStorage
- Plaintext secrets lingering in React state after use
- Clipboard history exposure (with warnings)

**What we DON'T protect against:**

- Active XSS or malicious browser extensions
- Memory dumps or browser crash reports
- JavaScript garbage collection timing (non-deterministic)

## Project Structure

```
seedpgp-web/
├── src/
│   ├── components/
│   │   ├── PgpKeyInput.tsx         # PGP key import UI
│   │   ├── QrDisplay.tsx           # QR code generation
│   │   ├── QrScanner.tsx           # Camera + file scanner
│   │   ├── ReadOnly.tsx            # Read-only mode toggle
│   │   ├── StorageIndicator.tsx    # Storage monitoring
│   │   ├── SecurityWarnings.tsx    # Context alerts
│   │   └── ClipboardTracker.tsx    # Clipboard monitoring
│   ├── lib/
│   │   ├── seedpgp.ts              # Core encryption/decryption
│   │   ├── seedpgp.test.ts         # Test vectors
│   │   ├── sessionCrypto.ts        # Ephemeral session keys
│   │   ├── base45.ts               # Base45 codec
│   │   ├── crc16.ts                # CRC16-CCITT-FALSE
│   │   ├── qr.ts                   # QR utilities
│   │   └── types.ts                # TypeScript definitions
│   ├── App.tsx                     # Main application
│   └── main.tsx                    # React entry point
├── public/
│   └── _headers                    # Cloudflare CSP headers
├── package.json
├── vite.config.ts                  # Vite configuration
├── GEMINI.md                       # AI agent project brief
└── README.md                       # This file
```

## Tech Stack

- **Runtime**: [Bun](https://bun.sh) v1.3.6+
- **Language**: TypeScript (strict mode)
- **Crypto**: [OpenPGP.js](https://openpgpjs.org) v6.3.0
- **Framework**: React + Vite
- **UI**: Tailwind CSS
- **Icons**: lucide-react
- **QR**: html5-qrcode, qrcode
- **Testing**: Bun test runner
- **Deployment**: Cloudflare Pages

## Version History

### v1.4.3 (2026-01-30)

- ✅ Fixed textarea contrast for readability
- ✅ Fixed overlapping floating boxes
- ✅ Polished UI with modern crypto wallet design
- ✅ Updated background color to be lighter

### v1.4.2 (2026-01-30)

- ✅ Migrated to Cloudflare Pages for real CSP enforcement
- ✅ Added "Encrypted in memory" badge when mnemonic locked
- ✅ Improved security header configuration
- ✅ Updated deployment documentation

### v1.4.0 (2026-01-29)

- ✅ Extended session-key encryption to Restore flow
- ✅ Added 10-second auto-clear timer for restored mnemonic
- ✅ Added manual Hide button for immediate clearing
- ✅ Removed debug console logs from production

### v1.3.0 (2026-01-28)

- ✅ Implemented ephemeral session-key encryption (AES-GCM-256)
- ✅ Auto-clear mnemonic after QR generation (Backup flow)
- ✅ Encrypted cache for sensitive state
- ✅ Manual Lock/Clear functionality

### v1.2.0 (2026-01-27)

- ✅ Added storage monitoring (StorageIndicator)
- ✅ Added security warnings (context-aware)
- ✅ Added clipboard tracking
- ✅ Implemented read-only mode

### v1.1.0 (2026-01-26)

- ✅ Initial public release
- ✅ QR code generation and scanning
- ✅ Full BIP39 mnemonic support
- ✅ Trezor test vector validation
- ✅ Production-ready implementation

## Roadmap

- [ ] UI polish (modern crypto wallet design)
- [ ] Multi-frame support for larger payloads
- [ ] Hardware wallet integration
- [ ] Mobile scanning app
- [ ] Shamir Secret Sharing support
- [ ] Reproducible builds with git hash verification

## License

MIT License - see LICENSE file for details

## Author

**kccleoc** - [GitHub](https://github.com/kccleoc)

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⚠️ **Disclaimer**: This software is provided as-is. Always test thoroughly before trusting with real funds. The author is not responsible for lost funds due to software bugs or user error.