PHP GNUPG解密错误

当我解密一个加密字符串时，得到一个解密失败的响应。请参阅下面我的两个函数。我使用的是PHP5.9，我有一个正确的公钥、私钥和密码短语

//-----------------------------------------------------------------------------
//Function Name : Encrypt Data
//Purpose : Check key into database and one the basis of key encrypt post data
function encryptData($apiKey,$postBody){
    try {
        global $g_e_v,$gpg;

        $publicKeyResult = getKey($apiKey,'apikeys_public');
        $publicKey = $publicKeyResult->apikeys_public;

        //Set Enviroment variable for GNUPG.
        putenv("GNUPGHOME=".$g_e_v.".gnupg");
        $gpg->seterrormode(gnupg::ERROR_EXCEPTION);
        $info = $gpg->import($publicKey);
        var_dump($info);
        $gpg->addencryptkey($info['fingerprint']);
        $encryptData = $gpg->encrypt($postBody);
        return $encryptData;
    }
    catch (Exception $exception) {

                echo $exception->getMessage();
    }
}

//-----------------------------------------------------------------------------
//Function Name : Decrypt Data
//Purpose : Check key into database and on the basis of key decrypt post data.
function decryptData($apiKey,$postBody){
    try {
        global $g_e_v,$gpg;

        $privateKeyResult = getKey($apiKey,'apikeys_private,apikeys_passphrase');
        $privateKey = $privateKeyResult->apikeys_private;
        $phrase = $privateKeyResult->apikeys_passphrase;

        //Set Enviroment variable for GNUPG.
        putenv("GNUPGHOME=".$g_e_v.".gnupg");
        $gpg->seterrormode(gnupg::ERROR_EXCEPTION);
        $info = $gpg->import($privateKey);
        var_dump($info);
        $gpg->adddecryptkey($info['fingerprint'],$phrase);   
        $decryptData = $gpg->decrypt($postBody);
        return $decryptData;
    }
    catch (Exception $exception) {
                echo $exception->getMessage();
    }
}

我这样称呼它：

$en = encryptData('SGFmQMPtkFlWYM','This is a test');

echo $en;
$postBody = decryptData('SGFmQMPtkFlWYM', $en);

我的输出是：

/home/ubuntu/workspace/API/GlobalFunctions.php:81:
array (size=9)
  'imported' => int 0
  'unchanged' => int 1
  'newuserids' => int 0
  'newsubkeys' => int 0
  'secretimported' => int 0
  'secretunchanged' => int 0
  'newsignatures' => int 0
  'skippedkeys' => int 0
  'fingerprint' => string '51103C105AC9E46F06880CA6A1511AEACC486E40' (length=40)
-----BEGIN PGP MESSAGE----- Version: GnuPG v2.0.22 (GNU/Linux) hQIMA3Sy9vCeHG7RARAAwGXu4fnERB44ZXIITbx/MaW/xKHmJa9kEh4ep76Z3TKT TklqYIUbyvvpUrPsAXUUMHAlAiMCiLHbL1aySexSzQ2DhPHjjxEhW3gSVqjNwUxw EclaMHVsTK16EpePMJogWWfY9i1S+VlSQLaaopyiF85b3id94Ik3Pb8FyZ5QLmia Iw5rHs+lc89snZkn0HQo4G+nW0w5E7O1VZR/ktN/IUgdkKB95DPtS88Dv4CAGisK 21+Tfu3q/a7FVJj8FD0aTc7jM19cp1CaWyPk5k0elm3DEEG2qNw7bA4iy6PjPos1 mRahQtHZFr0WtpqPV52Nqimcha3CDjdzJpI0KP94sOXK7dDG2rRAHbcXgYv+Bei8 z95/OK76InPeJQY7sbf7UEyAqh4baAnTgQkXLfkHdKOlrPGw/N/y7IC2Yf2laMQY Q61mfPQ8ri3fxOaBisP8vaBGQAaqvCgje220WzTc3h+D/wYShPr28ftj68gwC4XD N++r2q6TEtbMhJNziq1RrN6m6tR060UBRjv/STCh1tNPFVecrFo5O8F5H78ag37H lI9Ngt7HSCtUF1W5gyFbRbXn3NVm6cBDmPS8Qmi7mDmmta7fbqtzj/R088BKfekD Gl49KZeNUfbPdeMxwU5V23cvCRzUIhXyxs31j1l5qdqH7HYdvtIOPkEfoJfx+NDS QQGum5038urfPruTf1cIj12sO2MoJFH4dlgPtGgi7CSN1/omtWjXJ8gKVwjVT0B5 F2oztlKKkVUrd551dchqkmnh =2kJj -----END PGP MESSAGE-----
/home/ubuntu/workspace/API/GlobalFunctions.php:108:
array (size=9)
  'imported' => int 0
  'unchanged' => int 1
  'newuserids' => int 0
  'newsubkeys' => int 0
  'secretimported' => int 0
  'secretunchanged' => int 1
  'newsignatures' => int 0
  'skippedkeys' => int 0
  'fingerprint' => string '51103C105AC9E46F06880CA6A1511AEACC486E40' (length=40)
decrypt failed
/home/ubuntu/workspace/API/Test.php:9:null