refactor: turn crackBlock into a private method

lib/index.js

@@ -30,31 +30,7 @@ class Cracker {
     this.broadcast = new EventEmitter()
   }
 
-  async crack (iv, cipher, challenge, concurrency = Infinity) {
-    let { state } = this
-
-    state.iv = iv
-    state.cipher = cipher
-
-    const original = Buffer.concat([iv, cipher])
-    const size = iv.length
-
-    state.intermediary = Buffer.alloc(cipher.length)
-
-    this.broadcast.emit(EVENTS.CRACK_START)
-
-    await pAll(range(cipher.length / size).map((block) => async () => {
-      const im = await this.crackBlock(iv, cipher, challenge, block)
-      state.intermediary = replace(state.intermediary, block * size, im)
-    }), { concurrency })
-
-    state.plain = xor(original.slice(0, state.intermediary.length), state.intermediary)
-
-    this.broadcast.emit(EVENTS.CRACK_END)
-    return toJS(state)
-  }
-
-  async crackBlock (iv, cipher, challenge, block) {
+  async _crackBlock (iv, cipher, challenge, block) {
     const original = Buffer.concat([iv, cipher])
     const size = iv.length
 
@@ -102,6 +78,30 @@ class Cracker {
     return intermediary
   }
 
+  async crack (iv, cipher, challenge, concurrency = Infinity) {
+    let { state } = this
+
+    state.iv = iv
+    state.cipher = cipher
+
+    const original = Buffer.concat([iv, cipher])
+    const size = iv.length
+
+    state.intermediary = Buffer.alloc(cipher.length)
+
+    this.broadcast.emit(EVENTS.CRACK_START)
+
+    await pAll(range(cipher.length / size).map((block) => async () => {
+      const im = await this._crackBlock(iv, cipher, challenge, block)
+      state.intermediary = replace(state.intermediary, block * size, im)
+    }), { concurrency })
+
+    state.plain = xor(original.slice(0, state.intermediary.length), state.intermediary)
+
+    this.broadcast.emit(EVENTS.CRACK_END)
+    return toJS(state)
+  }
+
   async modify (target, size, challenge) {
     const PLACEHOLDER = 255
 
@@ -116,7 +116,7 @@ class Cracker {
       const start = block * size
       const end = (block + 1) * size
 
-      intermediary = replace(intermediary, block * size, await this.crackBlock(iv, cipher, challenge, block))
+      intermediary = replace(intermediary, block * size, await this._crackBlock(iv, cipher, challenge, block))
 
       const vector = xor(
         intermediary.slice(start, end),