crypto-engine 🔐

Hybrid cryptography utilities for Node.js designed for secure API communication. This package combines RSA-OAEP for secure key exchange and AES-GCM for authenticated payload encryption, following modern cryptographic best practices.

This package is designed for secure API communication where:

• AES-GCM is used to encrypt request/response payloads
• RSA-OAEP is used to encrypt the AES key

Features

• RSA encryption using OAEP (SHA-256 + MGF1 SHA-1)
• AES-GCM encryption (128 / 192 / 256 bit)
• Authenticated encryption (confidentiality + integrity)
• Base64-friendly output for APIs
• ES Module support
• HMAC SHA-256 hash generator to Hex Lower

Installation

npm install crypto-engine


## Usage

### AES-GCM Encrypt Payload
```js
import aesGcmEncryptBase64 from "crypto-engine/aesGcmEncrypt";

const encryptedBody = aesGcmEncryptBase64(
  { amount: 1000 },
  AES_KEY_BASE64,
  IV_STRING
);


### RSA-ENCRYPT Encrypt 

import rsaEncrypt from "crypto-engine/rsaEncrypt";

const encryptedKey = rsaEncrypt(
  AES_KEY_BASE64 or IV_STRING,
  SERVER_PUBLIC_KEY_BASE64
);


### RSA-ENCRYPT Encrypt 

import rsaDecrypt from "crypto-engine/rsaDecrypt";

const decryptedStr = rsaDecrypt(
  inputBase64Str,
  AES_KEY_BASE64,
  IV_STRING
);

### HMAC SHA-256 hash generator Hex Lower

const hmacHexLower = hmacSha256HexLower (
  signInput, mAesKey
)