RSA加密

1. 生成私钥和公钥

# 私钥
openssl genrsa -out rsa_private_key.pem 1024

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

function createOpenSSLKeys($cnf)
{
    $private_key = '';
    $public_key = '';
    $config = [
        "digest_alg" => "sha512",
        "private_key_bits" => 2048,
        "private_key_type" => OPENSSL_KEYTYPE_RSA,
        'config' => $cnf
    ];
    $res = openssl_pkey_new($config);
    openssl_pkey_export($res, $private_key, null, $config);
    $public_key = openssl_pkey_get_details($res)['key'];
    return [
        'public_key' => $public_key,
        'private_key' => $private_key
    ];
}

2. 使用

$data = 'wogaslfgnladfghlanflgnaldnglanfhlnlabh';

$public_key = file_get_contents('rsa_public_key.pem');
$public = openssl_pkey_get_public($public_key);

$encode = '';

// 公钥加密
openssl_public_encrypt($data, $encode, $public);

$private_key = file_get_contents('rsa_private_key.pem');
$private = openssl_pkey_get_private($private_key);

$decode = '';

// 私钥解密
openssl_private_decrypt($encode, $decode, $private);

echo $decode;