1 files changed, 110 insertions, 0 deletions
diff --git a/ext/node/polyfills/_crypto/crypto_browserify/cipher_base.js b/ext/node/polyfills/_crypto/crypto_browserify/cipher_base.js
new file mode 100644
index 000000000..ceb143fc5
--- /dev/null
+++ b/ext/node/polyfills/_crypto/crypto_browserify/cipher_base.js
@@ -0,0 +1,110 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+// Copyright 2017 crypto-browserify. All rights reserved. MIT license.
+// deno-lint-ignore-file no-var
+
+import { Buffer } from "internal:deno_node/polyfills/buffer.ts";
+import { Transform } from "internal:deno_node/polyfills/stream.ts";
+import { StringDecoder } from "internal:deno_node/polyfills/string_decoder.ts";
+
+export function CipherBase(hashMode) {
+  Transform.call(this);
+  this.hashMode = typeof hashMode === "string";
+  if (this.hashMode) {
+    this[hashMode] = this._finalOrDigest;
+  } else {
+    this.final = this._finalOrDigest;
+  }
+  if (this._final) {
+    this.__final = this._final;
+    this._final = null;
+  }
+  this._decoder = null;
+  this._encoding = null;
+}
+// inherits(CipherBase, Transform)
+CipherBase.prototype = Object.create(Transform.prototype, {
+  constructor: {
+    value: CipherBase,
+    enumerable: false,
+    writable: true,
+    configurable: true,
+  },
+});
+
+CipherBase.prototype.update = function (data, inputEnc, outputEnc) {
+  if (typeof data === "string") {
+    data = Buffer.from(data, inputEnc);
+  }
+
+  var outData = this._update(data);
+  if (this.hashMode) return this;
+
+  if (outputEnc) {
+    outData = this._toString(outData, outputEnc);
+  }
+
+  return outData;
+};
+
+CipherBase.prototype.setAutoPadding = function () {};
+CipherBase.prototype.getAuthTag = function () {
+  throw new Error("trying to get auth tag in unsupported state");
+};
+
+CipherBase.prototype.setAuthTag = function () {
+  throw new Error("trying to set auth tag in unsupported state");
+};
+
+CipherBase.prototype.setAAD = function () {
+  throw new Error("trying to set aad in unsupported state");
+};
+
+CipherBase.prototype._transform = function (data, _, next) {
+  var err;
+  try {
+    if (this.hashMode) {
+      this._update(data);
+    } else {
+      this.push(this._update(data));
+    }
+  } catch (e) {
+    err = e;
+  } finally {
+    next(err);
+  }
+};
+CipherBase.prototype._flush = function (done) {
+  var err;
+  try {
+    this.push(this.__final());
+  } catch (e) {
+    err = e;
+  }
+
+  done(err);
+};
+CipherBase.prototype._finalOrDigest = function (outputEnc) {
+  var outData = this.__final() || Buffer.alloc(0);
+  if (outputEnc) {
+    outData = this._toString(outData, outputEnc, true);
+  }
+  return outData;
+};
+
+CipherBase.prototype._toString = function (value, enc, fin) {
+  if (!this._decoder) {
+    this._decoder = new StringDecoder(enc);
+    this._encoding = enc;
+  }
+
+  if (this._encoding !== enc) throw new Error("can't switch encodings");
+
+  var out = this._decoder.write(value);
+  if (fin) {
+    out += this._decoder.end();
+  }
+
+  return out;
+};
+
+export default CipherBase;