Implement proper key types

Signed-off-by: Lee Smet <lee.smet@hotmail.com>

Cargo.toml

@@ -10,18 +10,24 @@ keywords = ["system", "os", "abstraction", "platform", "filesystem"]
 categories = ["os", "filesystem", "api-bindings"]
 readme = "README.md"
 
+[workspace]
+members = [".", "vault"]
+
 [dependencies]
 anyhow = "1.0.98"
-base64 = "0.22.1"  # Base64 encoding/decoding
+base64 = "0.22.1" # Base64 encoding/decoding
 cfg-if = "1.0"
 chacha20poly1305 = "0.10.1" # ChaCha20Poly1305 AEAD cipher
 clap = "2.34.0" # Command-line argument parsing
-dirs = "6.0.0"     # Directory paths
+dirs = "6.0.0" # Directory paths
 env_logger = "0.11.8" # Logger implementation
 ethers = { version = "2.0.7", features = ["legacy"] } # Ethereum library
 glob = "0.3.1" # For file pattern matching
 jsonrpsee = "0.25.1"
-k256 = { version = "0.13.4", features = ["ecdsa", "ecdh"] } # Elliptic curve cryptography
+k256 = { version = "0.13.4", features = [
+    "ecdsa",
+    "ecdh",
+] } # Elliptic curve cryptography
 lazy_static = "1.4.0" # For lazy initialization of static variables
 libc = "0.2"
 log = "0.4" # Logging facade
@@ -38,7 +44,7 @@ serde = { version = "1.0", features = [
     "derive",
 ] } # For serialization/deserialization
 serde_json = "1.0" # For JSON handling
-sha2 = "0.10.7"    # SHA-2 hash functions
+sha2 = "0.10.7" # SHA-2 hash functions
 tempfile = "3.5" # For temporary file operations
 tera = "1.19.0" # Template engine for text rendering
 thiserror = "2.0.12" # For error handling
@@ -46,7 +52,7 @@ tokio = "1.45.0"
 tokio-postgres = "0.7.8" # Async PostgreSQL client
 tokio-test = "0.4.4"
 uuid = { version = "1.16.0", features = ["v4"] }
-zinit-client = { git = "https://github.com/threefoldtech/zinit", branch = "json_rpc",  package = "zinit-client" }
+zinit-client = { git = "https://github.com/threefoldtech/zinit", branch = "json_rpc", package = "zinit-client" }
 # Optional features for specific OS functionality
 [target.'cfg(unix)'.dependencies]
 nix = "0.30.1" # Unix-specific functionality
@@ -60,8 +66,11 @@ windows = { version = "0.61.1", features = [
 
 [dev-dependencies]
 mockall = "0.13.1" # For mocking in tests
-tempfile = "3.5"   # For tests that need temporary files/directories
-tokio = { version = "1.28", features = ["full", "test-util"] } # For async testing
+tempfile = "3.5" # For tests that need temporary files/directories
+tokio = { version = "1.28", features = [
+    "full",
+    "test-util",
+] } # For async testing
 
 [[bin]]
 name = "herodo"