EC Public Key Encryption with OpenSSL

Question

Is there a possibility in PHP's OpenSSL implementation to encrypt via public key/decrypt via private key using PHP OpenSSL?

As per the OpenSSL documentation, openssl_seal() does not support an EC public key.

The public key must be RSA because it is the only OpenSSL public key algorithm that supports key transport.

openssl_public_encrypt() also throws an error when using it with an EC key.

My key creation works as follows:

// Configuration settings for the key
$config = array(
    "private_key_type" => OPENSSL_KEYTYPE_EC,
    "curve_name" => "secp521r1"
);
    
// Create the private and public key
$res = openssl_pkey_new($config);
    
// Extract the private key into $private_key
openssl_pkey_export($res, $private_key);
    
// Extract the public key into $public_key
$public_key = openssl_pkey_get_details($res);
$public_key = $public_key["key"];

Is there any way to do ec public key encryption with OpenSSL?

Why is the failure of openssl() and openssl_public_encrypt() for EC not documented at php.net?

EC Public Key Encryption with OpenSSL

0 Answers