RSA encryption between c++ and node.js

I have to send some encrypted data throught the network (websocket)

I generated a key pair with the the following node.js module :

https://github.com/juliangruber/keypair

My public key looks like this:

-----BEGIN RSA PUBLIC KEY-----
MIIBCgKCAQEAlUiMDQsBgj5P/T86w/eg9MXUj8M4WMVihP8YzmDxMqCFb7D+w4N/1XcxWxQT
....
Wo+SRCsr6npfp1ctDhMtkXIeNT4lKf3qUGhP5tbx/TreaNF/d8zCeinGR/KeBGadMwIDAQAB
-----END RSA PUBLIC KEY-----

In the C++ code, I generated a RSA class with read the public key via a char*

const char rsaKey1[] = "-----BEGIN RSA PUBLIC KEY-----\n"
"MIIBCgKCAQEAlUiMDQsBgj5P/T86w/eg9MXUj8M4WMVihP8YzmDxMqCFb7D+w4N/1XcxWxQT\n"
....
"Wo+SRCsr6npfp1ctDhMtkXIeNT4lKf3qUGhP5tbx/TreaNF/d8zCeinGR/KeBGadMwIDAQAB\n"
"-----END RSA PUBLIC KEY-----\n";


BIO* bio = BIO_new_mem_buf( rsaKey1, strlen(rsaKey1)); 

m_rsaPubKey = PEM_read_bio_RSAPublicKey(bio, NULL, NULL, NULL);

usigned the m_rsaPubKey , I have able to generate a std::vector of unsigned char with encrypted data

 std::vector<u8> Rsa::encrypt(std::string & msg)
 {

    std::vector<u8> encryptedData;

    char *encrypt = new char[RSA_size(m_rsaPubKey)];

    int encryptLen;

    if (encryptLen = RSA_public_encrypt(msg.size() + 1, (unsigned 
    char*)msg.c_str(), (unsigned char*)encrypt, m_rsaPubKey, 
    RSA_PKCS1_OAEP_PADDING) == -1)
    {
        LogOutSys("error encoding string");
    }

    for (u32 i = 0; i < strlen(encrypt); i++)
    {
        encryptedData.push_back(encrypt[i]);
    }

    delete encrypt;

    return encryptedData;
}

I don't get any errors while reading the public key or encrypting my data so I assume the encryption went ok.

then the data went throught a websocket and is received with node.js

the private key is read like this:

var rsa = new RSA(fs.readFileSync("./rsa-keys/sj_private_1.pem"),
{encryptionScheme :'pkcs8'})

and decoding

 var decrypted = rsa.decrypt(data)

where data is a buffer of same length and content (no corruption while sending via the websocket)

c++ side:

encrypted len 256, first bytes 117 125 58 109

node size :

Buffer(256) [117, 125, 58, 109, 38, 229, 7, 189, …]

the rsa.decrypt generated an exception :

TypeError: Cannot read property 'length' of null

I tried several encryptionScheme option (including the default , but always getting the same error or Incorrect key or data