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Author: javascript-2020

blog/26-04-26/x509-certificates-in-js---encrypt-decrypt-data/ex/aes-encrypt-decrypt-nodejs.js

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+/*
+
+aes-encrypt-decrypt-nodejs.js
+
+30-04-26
+
+
+*/
+
+
+
+const crypto = require("crypto");
+
+function importAesKey(base64) {
+  return Buffer.from(base64, "base64"); // raw 32‑byte key
+}
+
+
+function aesEncryptNode(keyBuf, plaintext) {
+  const iv = crypto.randomBytes(12);
+  
+  const cipher = crypto.createCipheriv("aes-256-gcm", keyBuf, iv);
+  
+  const encrypted = Buffer.concat([
+    cipher.update(plaintext, "utf8"),
+    cipher.final()
+  ]);
+  
+  const tag = cipher.getAuthTag();
+  
+  return {
+    iv: iv.toString("base64"),
+    data: encrypted.toString("base64"),
+    tag: tag.toString("base64"),
+  };
+}
+
+
+
+function aesDecryptNode(keyBuf, encrypted) {
+  const iv = Buffer.from(encrypted.iv, "base64");
+  const data = Buffer.from(encrypted.data, "base64");
+  const tag = Buffer.from(encrypted.tag, "base64");
+  
+  const decipher = crypto.createDecipheriv("aes-256-gcm", keyBuf, iv);
+  decipher.setAuthTag(tag);
+  
+  const decrypted = Buffer.concat([
+    decipher.update(data),
+    decipher.final()
+  ]);
+  
+  return decrypted.toString("utf8");
+}
+
+
+
+
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+