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https://github.com/luxfi/mpc.git
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zeekay
c7f126adbf
Security (from red team review): - Replay protection: request_id + timestamp freshness on sign API - Ed25519 message auth re-enabled on all protocol messages - DKG timeout (5min) + signing timeout (30s) with watchdog - Dedup map TTL cleanup (10min expiry, 2min sweep) BLS threshold signing: - KeyTypeBLS + keygen/signing sessions - TrustedDealer pattern for BLS DKG - CBOR serialization for BLS config - 8 tests ZapDB KMS-backing: - HSM PasswordProvider wired to ZapDB init - Supports: AWS KMS, GCP KMS, Azure KV, env, file - Default env for backward compat - 19 tests Also: sr25519 sessions, fixed SignWireMessage build break
55 lines
1.5 KiB
Go
55 lines
1.5 KiB
Go
package types
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import (
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"crypto/ed25519"
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"crypto/sha256"
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"fmt"
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)
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// Message represents a protocol message
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type Message struct {
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SessionID string `json:"session_id"`
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SenderID string `json:"sender_id"`
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SenderNodeID string `json:"sender_node_id,omitempty"` // Raw node ID for key lookup
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RecipientIDs []string `json:"recipient_ids"`
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Body []byte `json:"body"`
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IsBroadcast bool `json:"is_broadcast"`
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Signature []byte `json:"signature,omitempty"` // Ed25519 signature over signable fields
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}
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// SignableBytes returns a deterministic byte representation of the message
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// fields that are covered by the signature. The signature field itself is
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// excluded.
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func (m *Message) SignableBytes() []byte {
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h := sha256.New()
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h.Write([]byte(m.SessionID))
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h.Write([]byte(m.SenderID))
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h.Write([]byte(m.SenderNodeID))
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for _, r := range m.RecipientIDs {
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h.Write([]byte(r))
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}
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h.Write(m.Body)
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if m.IsBroadcast {
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h.Write([]byte{1})
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} else {
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h.Write([]byte{0})
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}
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return h.Sum(nil)
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}
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// Sign signs the message with the given Ed25519 private key.
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func (m *Message) Sign(privateKey ed25519.PrivateKey) {
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m.Signature = ed25519.Sign(privateKey, m.SignableBytes())
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}
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// Verify checks the message signature against the given Ed25519 public key.
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func (m *Message) Verify(publicKey ed25519.PublicKey) error {
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if len(m.Signature) == 0 {
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return fmt.Errorf("message has no signature")
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}
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if !ed25519.Verify(publicKey, m.SignableBytes(), m.Signature) {
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return fmt.Errorf("invalid message signature from %s", m.SenderNodeID)
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}
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return nil
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}
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