openssl genrsa -out rsa_private_key.pem

openssl rsa -in rsa_private_key.pem -pubout -out rsa_public_key.pem

function readPublicKey($keyPath)

{

    $key = file_get_contents($keyPath);

    $this->rsaPublicKey =  openssl_pkey_get_public($key)

}

function readPrivateKey($keyPath)

{

    $key = file_get_contents($keyPath);

    $this->rsaPrivateKey =  openssl_pkey_get_private($key)

}

// 加密后转为base64编码

function encrypt($originalData)

{

    $crypto = '';

    foreach (str_split($originalData, 117) as $chunk)

    {

        openssl_public_encrypt($chunk, $encryptData, $this->rsaPublicKey);

        $crypto .= $encryptData;

    }

    return base64_encode($crypto);

}

// base64 post 过来后 '+' 号变成 空格

function decrypt($encryptData)

{

    $crypto = '';

    foreach (str_split(str_replace(' ', '+', base64_decode($encryptData)), 128) as $chunk)

    {

        openssl_private_decrypt($chunk, $decryptData, $this->rsaPrivateKey);

        $crypto .= $decryptData;

    }

    return $crypto;

}