refactor: move createDecipheriv onto environment object

Author: andipaetzold

src/crypto/blockDecrypt.ts

@@ -1,9 +1,9 @@
-import { createDecipheriv } from "../environment/index.js";
+import { environment } from "../environment/index.js";
 import type { Cipher } from "./types.js";
 
 export function blockDecrypt(cipher: Cipher, key: Buffer, iv: Buffer, data: Buffer): Buffer {
     const algorithm = `${cipher.algorithm}-${key.length * 8}-${cipher.chaining.slice(-3)}`;
-    const decipher = createDecipheriv(algorithm, key, iv);
+    const decipher = environment.createDecipheriv(algorithm, key, iv);
     decipher.setAutoPadding(false);
     return decipher.update(data);
 }

src/environment/browser.ts

@@ -2,9 +2,9 @@ import browserifyAES from "browserify-aes/browser.js";
 import { inflate as pakoInflate } from "pako";
 import type { Environment } from "./types.js";
 
-export const createDecipheriv = browserifyAES.createDecipheriv;
 export { default as createHash } from "create-hash";
 
 export const environment: Environment = {
     inflate: (data) => Buffer.from(pakoInflate(data)),
+    createDecipheriv: browserifyAES.createDecipheriv,
 };

src/environment/node.ts

@@ -1,8 +1,10 @@
 import { inflateSync } from "node:zlib";
 import type { Environment } from "./types.js";
+import { createDecipheriv } from "crypto";
 
-export { createDecipheriv, createHash } from "crypto";
+export { createHash } from "crypto";
 
 export const environment: Environment = {
     inflate: (data) => inflateSync(data),
+    createDecipheriv,
 };

src/environment/types.ts

@@ -1,3 +1,9 @@
 export type Environment = {
     inflate: (data: Buffer) => Buffer;
-}
+    createDecipheriv: (algorithm: string, key: Buffer, iv: Buffer) => Decipher;
+};
+
+export type Decipher = {
+    setAutoPadding: (padding: boolean) => void;
+    update: (data: Buffer) => Buffer;
+};