feature/1121 implement ucan validation (#1176)

- **refactor: remove unused auth components**
- **refactor: improve devbox configuration and deployment process**
- **refactor: improve devnet and testnet setup**
- **fix: update templ version to v0.2.778**
- **refactor: rename pkl/net.matrix to pkl/matrix.net**
- **refactor: migrate webapp components to nebula**
- **refactor: protobuf types**
- **chore: update dependencies for improved security and stability**
- **feat: implement landing page and vault gateway servers**
- **refactor: Migrate data models to new module structure and update
related files**
- **feature/1121-implement-ucan-validation**
- **refactor: Replace hardcoded constants with model types in attns.go**
- **feature/1121-implement-ucan-validation**
- **chore: add origin Host struct and update main function to handle
multiple hosts**
- **build: remove unused static files from dwn module**
- **build: remove unused static files from dwn module**
- **refactor: Move DWN models to common package**
- **refactor: move models to pkg/common**
- **refactor: move vault web app assets to embed module**
- **refactor: update session middleware import path**
- **chore: configure port labels and auto-forwarding behavior**
- **feat: enhance devcontainer configuration**
- **feat: Add UCAN middleware for Echo with flexible token validation**
- **feat: add JWT middleware for UCAN authentication**
- **refactor: update package URI and versioning in PklProject files**
- **fix: correct sonr.pkl import path**
- **refactor: move JWT related code to auth package**
- **feat: introduce vault configuration retrieval and management**
- **refactor: Move vault components to gateway module and update file
paths**
- **refactor: remove Dexie and SQLite database implementations**
- **feat: enhance frontend with PWA features and WASM integration**
- **feat: add Devbox features and streamline Dockerfile**
- **chore: update dependencies to include TigerBeetle**
- **chore(deps): update go version to 1.23**
- **feat: enhance devnet setup with PATH environment variable and
updated PWA manifest**
- **fix: upgrade tigerbeetle-go dependency and remove indirect
dependency**
- **feat: add PostgreSQL support to devnet and testnet deployments**
- **refactor: rename keyshare cookie to token cookie**
- **feat: upgrade Go version to 1.23.3 and update dependencies**
- **refactor: update devnet and testnet configurations**
- **feat: add IPFS configuration for devnet**
- **I'll help you update the ipfs.config.pkl to include all the peers
from the shell script. Here's the updated configuration:**
- **refactor: move mpc package to crypto directory**
- **feat: add BIP32 support for various cryptocurrencies**
- **feat: enhance ATN.pkl with additional capabilities**
- **refactor: simplify smart account and vault attenuation creation**
- **feat: add new capabilities to the Attenuation type**
- **refactor: Rename MPC files for clarity and consistency**
- **feat: add DIDKey support for cryptographic operations**
- **feat: add devnet and testnet deployment configurations**
- **fix: correct key derivation in bip32 package**
- **refactor: rename crypto/bip32 package to crypto/accaddr**
- **fix: remove duplicate indirect dependency**
- **refactor: move vault package to root directory**
- **refactor: update routes for gateway and vault**
- **refactor: remove obsolete web configuration file**
- **refactor: remove unused TigerBeetle imports and update host
configuration**
- **refactor: adjust styles directory path**
- **feat: add broadcastTx and simulateTx functions to gateway**
- **feat: add PinVault handler**

crypto/subtle/hkdf.go

@@ -0,0 +1,55 @@
+package subtle
+
+import (
+	"errors"
+	"fmt"
+	"io"
+
+	"golang.org/x/crypto/hkdf"
+)
+
+const (
+	// Minimum tag size in bytes. This provides minimum 80-bit security strength.
+	minTagSizeInBytes = uint32(10)
+)
+
+var errHKDFInvalidInput = errors.New("HKDF: invalid input")
+
+// validateHKDFParams validates parameters of HKDF constructor.
+func validateHKDFParams(hash string, _ uint32, tagSize uint32) error {
+	// validate tag size
+	digestSize, err := GetHashDigestSize(hash)
+	if err != nil {
+		return err
+	}
+	if tagSize > 255*digestSize {
+		return fmt.Errorf("tag size too big")
+	}
+	if tagSize < minTagSizeInBytes {
+		return fmt.Errorf("tag size too small")
+	}
+	return nil
+}
+
+// ComputeHKDF extracts a pseudorandom key.
+func ComputeHKDF(hashAlg string, key []byte, salt []byte, info []byte, tagSize uint32) ([]byte, error) {
+	keySize := uint32(len(key))
+	if err := validateHKDFParams(hashAlg, keySize, tagSize); err != nil {
+		return nil, fmt.Errorf("hkdf: %s", err)
+	}
+	hashFunc := GetHashFunc(hashAlg)
+	if hashFunc == nil {
+		return nil, fmt.Errorf("hkdf: invalid hash algorithm")
+	}
+	if len(salt) == 0 {
+		salt = make([]byte, hashFunc().Size())
+	}
+
+	result := make([]byte, tagSize)
+	kdf := hkdf.New(hashFunc, key, salt, info)
+	n, err := io.ReadFull(kdf, result)
+	if n != len(result) || err != nil {
+		return nil, fmt.Errorf("compute of hkdf failed")
+	}
+	return result, nil
+}