1 files changed, 63 insertions, 0 deletions
diff --git a/ext/node/polyfills/_crypto/crypto_browserify/asn1.js/decoders/pem.js b/ext/node/polyfills/_crypto/crypto_browserify/asn1.js/decoders/pem.js
new file mode 100644
index 000000000..3dedfb293
--- /dev/null
+++ b/ext/node/polyfills/_crypto/crypto_browserify/asn1.js/decoders/pem.js
@@ -0,0 +1,63 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+// Copyright 2017 Fedor Indutny. All rights reserved. MIT license.
+
+import { Buffer } from "internal:deno_node/polyfills/buffer.ts";
+
+import { DERDecoder } from "internal:deno_node/polyfills/_crypto/crypto_browserify/asn1.js/decoders/der.js";
+
+export function PEMDecoder(entity) {
+  DERDecoder.call(this, entity);
+  this.enc = "pem";
+}
+// inherits(PEMDecoder, DERDecoder);
+PEMDecoder.prototype = Object.create(DERDecoder.prototype, {
+  constructor: {
+    value: PEMDecoder,
+    enumerable: false,
+    writable: true,
+    configurable: true,
+  },
+});
+
+PEMDecoder.prototype.decode = function decode(data, options) {
+  const lines = data.toString().split(/[\r\n]+/g);
+
+  const label = options.label.toUpperCase();
+
+  const re = /^-----(BEGIN|END) ([^-]+)-----$/;
+  let start = -1;
+  let end = -1;
+  for (let i = 0; i < lines.length; i++) {
+    const match = lines[i].match(re);
+    if (match === null) {
+      continue;
+    }
+
+    if (match[2] !== label) {
+      continue;
+    }
+
+    if (start === -1) {
+      if (match[1] !== "BEGIN") {
+        break;
+      }
+      start = i;
+    } else {
+      if (match[1] !== "END") {
+        break;
+      }
+      end = i;
+      break;
+    }
+  }
+  if (start === -1 || end === -1) {
+    throw new Error("PEM section not found for: " + label);
+  }
+
+  const base64 = lines.slice(start + 1, end).join("");
+  // Remove excessive symbols
+  base64.replace(/[^a-z0-9+/=]+/gi, "");
+
+  const input = Buffer.from(base64, "base64");
+  return DERDecoder.prototype.decode.call(this, input, options);
+};