mcrypt_encrypt

    (PHP 4 >= 4.0.2, PHP 5, PHP 7 < 7.2.0, PECL mcrypt >= 1.0.0)

    mcrypt_encrypt — Encrypts plaintext with given parameters

    Advertencia

    Esta función ha sido declarada OBSOLETA a partir de PHP 7.1.0 y será ELIMINADA a partir de PHP 7.2.0. Su uso está totalmente desaconsejado.

    Descripción

    mcrypt_encrypt(
        string$cipher,
        string$key,
        string$data,
        string$mode,
        string$iv = ?
    ): string|false

    Encrypts the data and returns it.

    Parámetros

    cipher

    Una de las constantes MCRYPT_nombredelcifrado, o el nombre del algoritmo como string.

    key

    The key with which the data will be encrypted. If the provided key size is not supported by the cipher, the function will emit a warning and return false

    data

    The data that will be encrypted with the given cipher and mode. If the size of the data is not n * blocksize, the data will be padded with '\0'.

    The returned crypttext can be larger than the size of the data that was given by data.

    mode

    Una de las constantes MCRYPT_MODE_nombredelmodo, o una de las siguientes strings: "ecb", "cbc", "cfb", "ofb", "nofb" o "stream".

    iv

    Utilizado para la inicialización en los modos CBC, CFB, OFB, y en algunos algoritmos en el modo STREAM. Si el tamañlo del IV proporcionado no está soportado por el modo de encadenamiento o no se proporcionó ninún IV, y el modo de encadenamiento requiere uno, la función emitirá una advertencia y devolverá false.

    Valores devueltos

    Returns the encrypted data as a string o false en caso de error.

    Ejemplos

    Ejemplo #1 mcrypt_encrypt() Example

    <?php
    # --- ENCRYPTION ---

    # the key should be random binary, use scrypt, bcrypt or PBKDF2 to
    # convert a string into a key
    # key is specified using hexadecimal
    $key = pack('H*', "bcb04b7e103a0cd8b54763051cef08bc55abe029fdebae5e1d417e2ffb2a00a3");

    # show key size use either 16, 24 or 32 byte keys for AES-128, 192
    # and 256 respectively
    $key_size = strlen($key);
    echo     "Key size: " . $key_size . "\n";

    $plaintext = "This string was AES-256 / CBC / ZeroBytePadding encrypted.";

    # create a random IV to use with CBC encoding
    $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
    $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);

    # creates a cipher text compatible with AES (Rijndael block size = 128)
    # to keep the text confidential
    # only suitable for encoded input that never ends with value 00h
    # (because of default zero padding)
    $ciphertext = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key,
    $plaintext, MCRYPT_MODE_CBC, $iv);

    # prepend the IV for it to be available for decryption
    $ciphertext = $iv . $ciphertext;

    # encode the resulting cipher text so it can be represented by a string
    $ciphertext_base64 = base64_encode($ciphertext);

    echo     $ciphertext_base64 . "\n";

    # === WARNING ===

    # Resulting cipher text has no integrity or authenticity added
    # and is not protected against padding oracle attacks.

    # --- DECRYPTION ---

    $ciphertext_dec = base64_decode($ciphertext_base64);

    # retrieves the IV, iv_size should be created using mcrypt_get_iv_size()
    $iv_dec = substr($ciphertext_dec, 0, $iv_size);

    # retrieves the cipher text (everything except the $iv_size in the front)
    $ciphertext_dec = substr($ciphertext_dec, $iv_size);

    # may remove 00h valued characters from end of plain text
    $plaintext_dec = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key,
    $ciphertext_dec, MCRYPT_MODE_CBC, $iv_dec);

    echo     $plaintext_dec . "\n";
    ?>

    El resultado del ejemplo sería:

    Key size: 32 ENJW8mS2KaJoNB5E5CoSAAu0xARgsR1bdzFWpEn+poYw45q+73az5kYi4j+0haevext1dGrcW8Qi59txfCBV8BBj3bzRP3dFCp3CPQSJ8eU= This string was AES-256 / CBC / ZeroBytePadding encrypted.

    Ver también

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