chore: align slurp config and scaffolding

pkg/crypto/role_crypto_stub.go

@@ -0,0 +1,75 @@
+package crypto
+
+import (
+	"crypto/sha256"
+	"encoding/base64"
+	"encoding/json"
+	"fmt"
+
+	"chorus/pkg/config"
+)
+
+type RoleCrypto struct {
+	config *config.Config
+}
+
+func NewRoleCrypto(cfg *config.Config, _ interface{}, _ interface{}, _ interface{}) (*RoleCrypto, error) {
+	if cfg == nil {
+		return nil, fmt.Errorf("config cannot be nil")
+	}
+	return &RoleCrypto{config: cfg}, nil
+}
+
+func (rc *RoleCrypto) EncryptForRole(data []byte, role string) ([]byte, string, error) {
+	if len(data) == 0 {
+		return []byte{}, rc.fingerprint(data), nil
+	}
+	encoded := make([]byte, base64.StdEncoding.EncodedLen(len(data)))
+	base64.StdEncoding.Encode(encoded, data)
+	return encoded, rc.fingerprint(data), nil
+}
+
+func (rc *RoleCrypto) DecryptForRole(data []byte, role string, _ string) ([]byte, error) {
+	if len(data) == 0 {
+		return []byte{}, nil
+	}
+	decoded := make([]byte, base64.StdEncoding.DecodedLen(len(data)))
+	n, err := base64.StdEncoding.Decode(decoded, data)
+	if err != nil {
+		return nil, err
+	}
+	return decoded[:n], nil
+}
+
+func (rc *RoleCrypto) EncryptContextForRoles(payload interface{}, roles []string, _ []string) ([]byte, error) {
+	raw, err := json.Marshal(payload)
+	if err != nil {
+		return nil, err
+	}
+	encoded := make([]byte, base64.StdEncoding.EncodedLen(len(raw)))
+	base64.StdEncoding.Encode(encoded, raw)
+	return encoded, nil
+}
+
+func (rc *RoleCrypto) fingerprint(data []byte) string {
+	sum := sha256.Sum256(data)
+	return base64.StdEncoding.EncodeToString(sum[:])
+}
+
+type StorageAccessController interface {
+	CanStore(role, key string) bool
+	CanRetrieve(role, key string) bool
+}
+
+type StorageAuditLogger interface {
+	LogEncryptionOperation(role, key, operation string, success bool)
+	LogDecryptionOperation(role, key, operation string, success bool)
+	LogKeyRotation(role, keyID string, success bool, message string)
+	LogError(message string)
+	LogAccessDenial(role, key, operation string)
+}
+
+type KeyInfo struct {
+	Role  string
+	KeyID string
+}