RSA Encryption in React and Decryption in node js.

RSA is one of the first public-key cryptosystems and is widely used for secure data transmission. It consist of two keys: Public key and private key. It allows anyone with public key to encrypt message which can be decrypt only by person having private key.

Below is encryption code.

Encrypted data is binary data encoded in base64.

Public key will look something like below:

This is 1024 bit public key created using openssl. As 1024 bit key is more vulnerable and easier to crack, people have started using 2048 bit key.

Commands to create public and private keys

From client, you will receive encrypted message present in base64 encoded format. You can pass privateKey as string or buffer or KeyObject type to create RsaPrivateKey object. passphrase should be same as the one provided while creating private key. We are using pkcs1 padding to decrypt the message because JSEncrypt uses pkcs1 padding for encryption.

If you are passing private key as string then it should be passed in pem format

If you have private key as single line then convert it into key object

It better to have private key in single line as it becomes easier to pass it as environment variable to the server.

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