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/signatures/common/hmacdrbg.go

@@ -0,0 +1,99 @@
+//
+// Copyright Coinbase, Inc. All Rights Reserved.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+package common
+
+import (
+	"crypto/hmac"
+	"hash"
+)
+
+// HmacDrbg is an HMAC deterministic random bit generator
+// that can use any hash function. Handles reseeding
+// automatically
+type HmacDrbg struct {
+	k, v   []byte
+	count  int
+	hasher func() hash.Hash
+}
+
+func NewHmacDrbg(entropy, nonce, pers []byte, hasher func() hash.Hash) *HmacDrbg {
+	drbg := new(HmacDrbg)
+	h := hasher()
+	drbg.k = make([]byte, h.Size())
+	drbg.v = make([]byte, h.Size())
+	drbg.count = 0
+	drbg.hasher = hasher
+
+	for i := range drbg.v {
+		drbg.v[i] = 1
+	}
+
+	drbg.update([][]byte{entropy, nonce, pers})
+	drbg.count += 1
+	return drbg
+}
+
+func (drbg *HmacDrbg) Read(dst []byte) (n int, err error) {
+	toRead := len(dst)
+	if toRead == 0 {
+		return 0, nil
+	}
+	i := 0
+	for i < toRead {
+		vmac := drbg.getHmac()
+		_, _ = vmac.Write(drbg.v)
+		drbg.v = vmac.Sum(nil)
+
+		for j, b := range drbg.v {
+			dst[i+j] = b
+		}
+		i += len(drbg.v)
+	}
+	drbg.update(nil)
+	drbg.count++
+	return i, nil
+}
+
+func (drbg *HmacDrbg) Reseed(entropy []byte) {
+	drbg.update([][]byte{entropy})
+}
+
+func (drbg *HmacDrbg) getHmac() hash.Hash {
+	return hmac.New(drbg.hasher, drbg.k)
+}
+
+func (drbg *HmacDrbg) update(seeds [][]byte) {
+	kmac := drbg.getHmac()
+	_, _ = kmac.Write(drbg.v)
+	_, _ = kmac.Write([]byte{0})
+	if len(seeds) > 0 {
+		for _, seed := range seeds {
+			_, _ = kmac.Write(seed)
+		}
+	}
+	drbg.k = kmac.Sum(nil)
+
+	vmac := drbg.getHmac()
+	_, _ = vmac.Write(drbg.v)
+	drbg.v = vmac.Sum(nil)
+
+	if len(seeds) == 0 {
+		return
+	}
+
+	kmac = drbg.getHmac()
+	_, _ = kmac.Write(drbg.v)
+	_, _ = kmac.Write([]byte{1})
+	for _, seed := range seeds {
+		_, _ = kmac.Write(seed)
+	}
+	drbg.k = kmac.Sum(nil)
+
+	vmac = drbg.getHmac()
+	_, _ = vmac.Write(drbg.v)
+	drbg.v = vmac.Sum(nil)
+}