php RSA公鑰私鑰加解密和驗證用法

現在很多項目中會使用到rsa加解密和驗證相關的技術，分別整理代碼如下，方便記憶和使用。

【簽名和驗證】

//獲得簽名
function getSign($data) {
    $pem =  'my_rsa_private_key.pem';
    $privateKey = openssl_get_privatekey(file_get_contents($pem));
    openssl_sign($data, $sign, $privateKey);
    openssl_free_key($privateKey);
    return base64_encode($sign);
}
//驗證簽名
function checkSign($data, $sign) {
    $pem =  'my_rsa_public_key.pem';
    $publicKey = openssl_get_publickey(file_get_contents($pem));
    $result = openssl_verify($data, $sign, $publicKey);
    openssl_free_key($publicKey);
    return $result;
}
$signData = 'php-rsa';
$getSign = getSign($data);
$checkSign = checkSign($data, base64_decode($sign));
echo '簽名數據：'.$signData;
echo '獲得簽名：'.$getSign;
echo '驗證簽名：'.$checkSign;

運行結果如下：
簽名數據：php-rsa
簽名結果：LOVAjWTgHeUvJIK0scVOQO2VlId+1qEuUc70cb7Z/dyMONpheldefkKJXZDF9HelTz/UnwEd00Tre698VGN1IX/sV7WTQJFCY+ypArfNx9mCzaEhMt0U60yGkIPh8wXqNG10YhgzPIw3Lvd/36FnRlTBXOZeJMbxFxhdJmSdeOQ=
驗證簽名：1

【數據加解密】

//加密數據
function sslEncrypt($source, $type, $key) {
    $maxlength = 117;
    $output = '';
    while ($source) {
        $input = substr($source, 0, $maxlength);
        $source = substr($source, $maxlength);
        if ($type == 'private') {
            $ok = openssl_private_encrypt($input, $encrypted, $key);
        } else {
            $ok = openssl_public_encrypt($input, $encrypted, $key);
        }
        $output .= $encrypted;
    }
    return $output;
}
//解密數據
function sslDecrypt($source, $type, $key) {
    $maxlength = 128;
    $output = '';
    while ($source) {
        $input = substr($source, 0, $maxlength);
        $source = substr($source, $maxlength);
        if ($type == 'private') {
            $ok = openssl_private_decrypt($input, $out, $key);
        } else {
            $ok = openssl_public_decrypt($input, $out, $key);
        }
        $output .= $out;
    }
    return $output;
}
$data = 'php-rsa';
$privatekey = openssl_get_privatekey(file_get_contents('my_rsa_private_key.pem'));
$publickey = openssl_get_publickey(file_get_contents('my_rsa_public_key.pem'));
$sign = base64_encode(sslEncrypt($data, 'private', $privatekey));
$jiemi = sslDecrypt(base64_decode($sign), 'public', $publickey);
38 echo '加密數據：'.$data;
39 echo '加密結果：'.$sign;
40 echo '解密數據：'.$jiemi;

運行結果如下：
加密數據：php-rsa
加密結果：aMCpl34vXbofR7a3OPPLElQg6jwG+xbdIsdfYGeVPtIhVp0INMu/0p9M8h+JiBBmGL/WVY9ynbrvNH6QtLXDoW23rm6EWPPKn53EIqt/9jM/fDX8EyaAvhIuaSJ2Q7dxz4hNF+Ykm0XZ5ytsCB71zYVPYfaHyo3Xk+VkZ/JvznE=
解密數據：php-rsa