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>mcrypt_encrypt</H1
><DIV
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><P
> (PHP 4 >= 4.0.2, PHP 5)</P
>mcrypt_encrypt -- Encrypts plaintext with given parameters</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN55325"
></A
><H2
>Description</H2
>string <B
CLASS="methodname"
>mcrypt_encrypt</B
> ( string cipher, string key, string data, string mode [, string iv])<BR
></BR
><P
> <B
CLASS="function"
>mcrypt_encrypt()</B
> encrypts the data
and returns the encrypted data.
</P
><P
> <VAR
CLASS="parameter"
>Cipher</VAR
> is one of the MCRYPT_ciphername
constants of the name of the algorithm as string.
</P
><P
> <VAR
CLASS="parameter"
>Key</VAR
> is the key with which the data
will be encrypted. If it's smaller that the required keysize, it
is padded with '<VAR
CLASS="literal"
>\0</VAR
>'. It is better not to use ASCII strings for
keys. It is recommended to use the mhash functions to create a key
from a string.
</P
><P
> <VAR
CLASS="parameter"
>Data</VAR
> is 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 '<VAR
CLASS="literal"
>\0</VAR
>'. The returned
crypttext can be larger that the size of the data that is given
by <VAR
CLASS="parameter"
>data</VAR
>.
</P
><P
> <VAR
CLASS="parameter"
>Mode</VAR
> is one of the MCRYPT_MODE_modename
constants of one of "ecb", "cbc", "cfb", "ofb", "nofb" or
"stream".
</P
><P
> The <VAR
CLASS="parameter"
>IV</VAR
> parameter is used for the
initialisation in CBC, CFB, OFB modes, and in some algorithms
in STREAM mode. If you do not supply an IV, while it is needed
for an algorithm, the function issues a warning and uses an
IV with all bytes set to '<VAR
CLASS="literal"
>\0</VAR
>'.
</P
><P
> <TABLE
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><DIV
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><P
><B
>Exemplu 1. <B
CLASS="function"
>mcrypt_encrypt()</B
> Example</B
></P
><TABLE
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><TD
><code><font color="#000000">
<font color="#0000BB"><?php<br /> $iv_size </font><font color="#007700">= </font><font color="#0000BB">mcrypt_get_iv_size</font><font color="#007700">(</font><font color="#0000BB">MCRYPT_RIJNDAEL_256</font><font color="#007700">, </font><font color="#0000BB">MCRYPT_MODE_ECB</font><font color="#007700">);<br /> </font><font color="#0000BB">$iv </font><font color="#007700">= </font><font color="#0000BB">mcrypt_create_iv</font><font color="#007700">(</font><font color="#0000BB">$iv_size</font><font color="#007700">, </font><font color="#0000BB">MCRYPT_RAND</font><font color="#007700">);<br /> </font><font color="#0000BB">$key </font><font color="#007700">= </font><font color="#DD0000">"This is a very secret key"</font><font color="#007700">;<br /> </font><font color="#0000BB">$text </font><font color="#007700">= </font><font color="#DD0000">"Meet me at 11 o'clock behind the monument."</font><font color="#007700">;<br /> echo </font><font color="#0000BB">strlen</font><font color="#007700">(</font><font color="#0000BB">$text</font><font color="#007700">) . </font><font color="#DD0000">"\n"</font><font color="#007700">;<br /><br /> </font><font color="#0000BB">$crypttext </font><font color="#007700">= </font><font color="#0000BB">mcrypt_encrypt</font><font color="#007700">(</font><font color="#0000BB">MCRYPT_RIJNDAEL_256</font><font color="#007700">, </font><font color="#0000BB">$key</font><font color="#007700">, </font><font color="#0000BB">$text</font><font color="#007700">, </font><font color="#0000BB">MCRYPT_MODE_ECB</font><font color="#007700">, </font><font color="#0000BB">$iv</font><font color="#007700">);<br /> echo </font><font color="#0000BB">strlen</font><font color="#007700">(</font><font color="#0000BB">$crypttext</font><font color="#007700">) . </font><font color="#DD0000">"\n"</font><font color="#007700">;<br /></font><font color="#0000BB">?></font>
</font>
</code></TD
></TR
></TABLE
><P
> The above example will print out:
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="screen"
>42
64</PRE
></TD
></TR
></TABLE
>
</P
></DIV
></TD
></TR
></TABLE
>
</P
><P
> See also <A
HREF="function.mcrypt-module-open.html"
><B
CLASS="function"
>mcrypt_module_open()</B
></A
> for a more advanced API
and an example.
</P
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