Add full monorepo: virtual-banker, backend, frontend, docs, scripts, deployment

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/security/kms.go

@@ -0,0 +1,38 @@
+package security
+
+import (
+	"context"
+)
+
+// KMS handles key management
+type KMS struct {
+	provider KMSProvider
+}
+
+// NewKMS creates a new KMS handler
+func NewKMS(provider KMSProvider) *KMS {
+	return &KMS{provider: provider}
+}
+
+// KMSProvider interface for key management
+type KMSProvider interface {
+	Encrypt(ctx context.Context, keyID string, data []byte) ([]byte, error)
+	Decrypt(ctx context.Context, keyID string, encrypted []byte) ([]byte, error)
+	Sign(ctx context.Context, keyID string, data []byte) ([]byte, error)
+}
+
+// Encrypt encrypts data using KMS
+func (k *KMS) Encrypt(ctx context.Context, keyID string, data []byte) ([]byte, error) {
+	return k.provider.Encrypt(ctx, keyID, data)
+}
+
+// Decrypt decrypts data using KMS
+func (k *KMS) Decrypt(ctx context.Context, keyID string, encrypted []byte) ([]byte, error) {
+	return k.provider.Decrypt(ctx, keyID, encrypted)
+}
+
+// Sign signs data using KMS
+func (k *KMS) Sign(ctx context.Context, keyID string, data []byte) ([]byte, error) {
+	return k.provider.Sign(ctx, keyID, data)
+}
+