Data Encryption Using PHP openssl_pkey

The simple method of Data Encryption and Decryption using openssl_pkey.

Hello! Folks, This blog is about encrypting and decrypting your data using PHP openssl_pkey methods. Before moving on to the main topics of the article make sure your server has enabled open_ssl and working properly. [read the article here]. There are other methods available in PHP for encryption and decryption. Once the configuration is done just follow the below methods:

In this blog post, we will discuss how to use PHP openssl_pkey to encrypt and decrypt data. It is an encryption library that uses the OpenSSL library. It provides an easy-to-use interface for data encryption and decryption.

First, we will discuss how to generate a public and private key pair using PHP openssl_pkey. Next, we will discuss how to use these keys to encrypt and decrypt data. Finally, we will discuss how to use PHP openssl_pkey to sign data.

There are other methods or functions to encrypt and decrypt your data as mentioned here.

Step 1:

Create a php file and add below codes:

class CryptGen{
// generate private and public key 
    public static function genKey(){
        $res = openssl_pkey_new([
            "private_key_bits" => 2048,
            "private_key_type" => OPENSSL_KEYTYPE_RSA,
        ]);
        
        openssl_pkey_export($res,$privatekey);
        return [$privatekey, openssl_pkey_get_details($res)['key']];
    }
    

//encryption method
    public static function getEncrypt($messge, $privateKey){
        openssl_private_encrypt($messge, $encrypted, $privateKey);
        return base64_encode($encrypted);
    }

//decryption method    
    public static function getDecrypt($encrypted, $publickey){
        openssl_public_decrypt(base64_decode($encrypted), $decrypted, $publickey);
        return $decrypted;
    }
    
// validate encrypted string
    public static function isValid($message,$encrypted, $publicKey){
        return $message == self::getDecrypt($encrypted,$publicKey);
    }

 
}

Now you nee to execute the class and its methods to get the result.

//get the key pairs
[$privateKey, $publickey] = CryptGen::genKey();

// Simple string
$message = "Hi There"."<br/>";

// Now encrypt
$encrypted_message = CryptGen::getEncrypt($message,$privateKey);

// encrypted message
echo $encrypted_message."<br/>";

//decrypted message
echo CryptGen::getDecrypt($encrypted_message, $publickey)."<br/>";

// vlidate message (returns bool(true) or bool(false))
var_dump(CryptGen::isValid($message,$encrypted_message,$publickey));

Hope it will work for you! 🙂

If somebody wants to develop a blockchain project [demo project] then it might help to build basic encryption and decryption.