# Metacrypt

Metacrypt is a cryptographic service for the [Metacircular](https://metacircular.net) platform. It provides an encrypted secrets barrier and pluggable cryptographic engines (CA/PKI, SSH CA, transit encryption, user-to-user encryption) over a gRPC and HTTPS API. Authentication is delegated to [MCIAS](https://mcias.metacircular.net:8443/docs).

It operates using a seal/unseal model similar to HashiCorp Vault: the service starts sealed on every boot and must be unlocked with a password before cryptographic operations are available.

## Quick Start

### Prerequisites

- Go 1.23+
- A running [MCIAS](https://mcias.metacircular.net:8443/docs) instance
- TLS certificate and key for the server

### Build

```bash
make metacrypt metacrypt-web
```

### Configure

```bash
cp deploy/examples/metacrypt.toml /srv/metacrypt/metacrypt.toml
# Edit to set listen_addr, tls_cert, tls_key, database.path, mcias.server_url
```

### Initialize

```bash
./metacrypt init --config /srv/metacrypt/metacrypt.toml
```

This prompts for a seal password and generates the master encryption key. **Store the seal password securely — it cannot be recovered if lost.**

### Run

```bash
./metacrypt server --config /srv/metacrypt/metacrypt.toml
```

The service starts **sealed**. Unseal it:

```bash
curl -sk -X POST https://localhost:8443/v1/unseal \
    -H 'Content-Type: application/json' \
    -d '{"password":"<seal-password>"}'
```

Or use the web UI: navigate to `https://<host>:8443/`.

### Docker

```bash
make docker
docker compose -f deploy/docker/docker-compose.yml up -d
```

See [RUNBOOK.md](RUNBOOK.md#docker-install) for volume setup instructions.

## Further Reading

| Document | Contents |
|---|---|
| [ARCHITECTURE.md](ARCHITECTURE.md) | Cryptographic design, key hierarchy, engine architecture, API reference, security model |
| [RUNBOOK.md](RUNBOOK.md) | Installation, daily operations, backup/restore, monitoring, troubleshooting |
| [PKI-ENGINE-PLAN.md](PKI-ENGINE-PLAN.md) | CA engine implementation plan |

## Development

```bash
make build      # Build all packages
make test       # Run tests
make vet        # Static analysis
make lint       # golangci-lint
make proto      # Regenerate protobuf/gRPC stubs
make proto-lint # Lint and check proto breaking changes
```
