replace deprecated Buffer slice() calls with subarray()

diff --git a/lib/mystery-box.js b/lib/mystery-box.js
index cb85ebe698453a70f48f6af68bdad8d7cdeb9b08..2fb68a583e2c9b2408e37f7d17dcde212bb9a481 100644 (file)
--- a/lib/mystery-box.js
+++ b/lib/mystery-box.js
@@ -74,7 +74,6 @@ class MysteryBox {
     if (!this.secrets.length) {
       throw new Error('missing encryption secret');
     }
-    // TODO: support secret rolling
 
     // Filter any unavailable algorithms
     const availableCiphers = crypto.getCiphers();
@@ -218,7 +217,7 @@ class MysteryBox {
     const raw = Buffer.from(base64URLToBase64(box), 'base64');
     let offset = 0;
 
-    const version = raw.slice(offset, 1).readUInt8(0);
+    const version = raw.subarray(offset, 1).readUInt8(0);
     if (!(version in this.versionParameters)) {
       throw new RangeError('unsupported version');
     }
@@ -231,23 +230,23 @@ class MysteryBox {
       throw new RangeError('not enough to unpack');
     }
 
-    const flags = raw.slice(offset, offset + v.flagsBytes).readUInt8(0);
+    const flags = raw.subarray(offset, offset + v.flagsBytes).readUInt8(0);
     offset += v.flagsBytes;
 
     const { compression, payloadIsBuffer } = MysteryBox._decodeFlags(flags);
 
-    const iv = raw.slice(offset, offset + v.ivBytes);
+    const iv = raw.subarray(offset, offset + v.ivBytes);
     offset += v.ivBytes;
 
-    const salt = raw.slice(offset, offset + v.saltBytes);
+    const salt = raw.subarray(offset, offset + v.saltBytes);
     offset += v.saltBytes;
 
-    const aad = raw.slice(0, offset); // Everything up to here
+    const aad = raw.subarray(0, offset); // Everything up to here
 
-    const tag = raw.slice(offset, offset + v.tagBytes);
+    const tag = raw.subarray(offset, offset + v.tagBytes);
     offset += v.tagBytes;
 
-    const encrypted = raw.slice(offset);
+    const encrypted = raw.subarray(offset);
 
     timingsMs.preCrypt = performance.now();