openssl_public_decrypt

(PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8)

openssl_public_decrypt — Gizli anahtarla şifrelenmiş verinin şifresini genel anahtarla çözer

Açıklama

openssl_public_decrypt(
    string $şifreli_veri,
    #[\SensitiveParameter] string &$şifresiz_veri,
    OpenSSLAsymmetricKey|OpenSSLCertificate|array|string $genel_anahtar,
    int $dolgu = OPENSSL_PKCS1_PADDING
): bool

Evvelce openssl_private_encrypt() tarafından şifrelenmiş şifreli_veri'nin şifresini çözüp sonucu veri bağımsız değişkenine yerleştirir.

Bu işlevi, şifrelenmiş iletinin gizli anahtarın sahibi tarafından yazılıp yazılmadığı öğrenmek için kullanabilirsiniz.

Bağımsız Değişkenler

şifreli_veri
şifresiz_veri
genel_anahtar: Veriyi şifrelemekte kullanılan gizli anahtarın karşılığı olan genel anahtar.
dolgu: Şunlardan biri ollabilir: OPENSSL_PKCS1_PADDING, OPENSSL_NO_PADDING.

Dönen Değerler

Başarı durumunda true, başarısızlık durumunda false döner.

Sürüm Bilgisi

Sürüm:	Açıklama
8.0.0	`genel_anahtar` artık OpenSSLAsymmetricKey veya OpenSSLCertificate örneği kabul ediyor; evvelce, `OpenSSL key` veya `OpenSSL X.509` özkaynağı kabul edilirdi.

Ayrıca Bakınız

openssl_private_encrypt() - Veriyi gizli anahtarla şifreler
openssl_private_decrypt() - Genel anahtarla şifrelenmiş verinin şifresini gizli anahtarla çözer

Improve This Page

Learn How To Improve This Page • Submit a Pull Request • Report a Bug

＋add a note

User Contributed Notes 1 note

down

Hernanibus ¶

8 years ago

Just a little note on  [P.Peyremorte]'s note in manual's openssl_private_encrypt.

"- openssl_private_encrypt can encrypt a maximum of 117 chars at one time."

This depends on the length of $key:

- For a 1024 bit key length => max number of chars (bytes) to encrypt = 1024/8 - 11(when padding used) = 117 chars (bytes).
- For a 2048 bit key length => max number of chars (bytes) to encrypt = 2048/8 - 11(when padding used) = 245 chars (bytes).
... and so on

By the way, if openssl_private_encrypt fails because of data size you won't get anything but just false as returned value, the same for openssl_public_decrypt() on decryption.

"- the encrypted output string is always 129 char length. If you use base64_encode on the encrypted output, it will give always 172 chars, with the last always "=" (filler)"

This again depends on the length of $key:

- For a 1024 bit key length => encrypted number of raw bytes is always a block of 128 bytes (1024 bits) by RSA design.
- For a 2048 bit key length => encrypted number of raw bytes is always a block of 256 bytes (2048 bits) by RSA design.
... and so on

About base64_encode output length, it depends on what you encode (meaning it depends on the bytes resulting after encryption), but in general the resulting encoded string will be about a 33% bigger (for 128 bytes bout 170 bytes and for 256 bytes about 340 bytes).

I would then generalize a little [P.Peyremorte]'s note by:
<?php
// given the variables as constants:

  //Block size for encryption block cipher
  private $ENCRYPT_BLOCK_SIZE = 200;// this for 2048 bit key for example, leaving some room

  //Block size for decryption block cipher
  private $DECRYPT_BLOCK_SIZE = 256;// this again for 2048 bit key

         //For encryption we would use:
  function encrypt_RSA($plainData, $privatePEMKey)
  {
    $encrypted = '';
    $plainData = str_split($plainData, $this->ENCRYPT_BLOCK_SIZE);
    foreach($plainData as $chunk)
    {
      $partialEncrypted = '';

      //using for example OPENSSL_PKCS1_PADDING as padding
      $encryptionOk = openssl_private_encrypt($chunk, $partialEncrypted, $privatePEMKey, OPENSSL_PKCS1_PADDING);

      if($encryptionOk === false){return false;}//also you can return and error. If too big this will be false
      $encrypted .= $partialEncrypted;
    }
    return base64_encode($encrypted);//encoding the whole binary String as MIME base 64
  }

         //For decryption we would use:
  protected function decrypt_RSA($publicPEMKey, $data)
  {
    $decrypted = '';

    //decode must be done before spliting for getting the binary String
    $data = str_split(base64_decode($data), $this->DECRYPT_BLOCK_SIZE);

    foreach($data as $chunk)
    {
      $partial = '';

      //be sure to match padding
      $decryptionOK = openssl_public_decrypt($chunk, $partial, $publicPEMKey, OPENSSL_PKCS1_PADDING);

      if($decryptionOK === false){return false;}//here also processed errors in decryption. If too big this will be false
      $decrypted .= $partial;
    }
    return $decrypted;
  }
?>

＋add a note