(PHP 4 >= 4.0.2, PHP 5, PHP 7)
mcrypt_encrypt — Encrypts plaintext with given parameters
$cipher
, string $key
, string $data
, string $mode
[, string $iv
] )Encrypts the data and returns it.
cipher
Una din constantele MCRYPT_ciphername sau denumirea algoritmului ca șir de caractere.
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 din constantele MCRYPT_MODE_modename sau unul din
șirurile de caractere: "ecb", "cbc", "cfb", "ofb", "nofb" sau "stream".
iv
Utilizat pentru inițializare în modurile CBC, CFB, OFB și în unii algoritmi în
modul STREAM. Dacă dimensiunea IV furnizat nu este susținută de modul înlănțuirii,
sau dacă nu a fost furnizat un IV, însă modul de înlănțuire îl necesită, funcția
va emite o avertizare și va întoarce FALSE.
Returns the encrypted data as a string sau FALSE în cazul eșecului.
| Versiune | Descriere |
|---|---|
| 5.6.0 |
Invalid key and iv sizes
are no longer accepted. mcrypt_encrypt() will now throw
a warning and return FALSE if the inputs are invalid. Previously keys and
IVs were padded with '\0' bytes to the next valid size.
|
Example #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";
?>
Exemplul de mai sus va afișa:
Key size: 32 ENJW8mS2KaJoNB5E5CoSAAu0xARgsR1bdzFWpEn+poYw45q+73az5kYi4j+0haevext1dGrcW8Qi59txfCBV8BBj3bzRP3dFCp3CPQSJ8eU= This string was AES-256 / CBC / ZeroBytePadding encrypted.