<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >mcrypt_encrypt</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="Manual do PHP" HREF="index.html"><LINK REL="UP" TITLE="Mcrypt Encryption Functions" HREF="ref.mcrypt.html"><LINK REL="PREVIOUS" TITLE="mcrypt_enc_self_test" HREF="function.mcrypt-enc-self-test.html"><LINK REL="NEXT" TITLE="mcrypt_generic_deinit" HREF="function.mcrypt-generic-deinit.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=UTF-8"></HEAD ><BODY CLASS="refentry" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >Manual do PHP</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.mcrypt-enc-self-test.html" ACCESSKEY="P" >Anterior</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.mcrypt-generic-deinit.html" ACCESSKEY="N" >Próxima</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.mcrypt-encrypt" ></A >mcrypt_encrypt</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN111845" ></A ><P > (PHP 4 >= 4.0.2, PHP 5)</P >mcrypt_encrypt -- Encrypts plaintext with given parameters</DIV ><DIV CLASS="refsect1" ><A NAME="AEN111848" ></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 > <CODE CLASS="parameter" >Cipher</CODE > is one of the MCRYPT_ciphername constants of the name of the algorithm as string. </P ><P > <CODE CLASS="parameter" >Key</CODE > is the key with which the data will be encrypted. If it's smaller that the required keysize, it is padded with '<TT CLASS="literal" >\0</TT >'. 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 > <CODE CLASS="parameter" >Data</CODE > 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 '<TT CLASS="literal" >\0</TT >'. The returned crypttext can be larger that the size of the data that is given by <CODE CLASS="parameter" >data</CODE >. </P ><P > <CODE CLASS="parameter" >Mode</CODE > is one of the MCRYPT_MODE_modename constants of one of "ecb", "cbc", "cfb", "ofb", "nofb" or "stream". </P ><P > The <CODE CLASS="parameter" >IV</CODE > 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 '<TT CLASS="literal" >\0</TT >'. </P ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN111885" ></A ><P ><B >Exemplo 1. <B CLASS="function" >mcrypt_encrypt()</B > Example</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><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 >O exemplo acima irá imprimir:</P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><PRE CLASS="screen" >42 64</PRE ></TD ></TR ></TABLE ></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 ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="function.mcrypt-enc-self-test.html" ACCESSKEY="P" >Anterior</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Principal</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.mcrypt-generic-deinit.html" ACCESSKEY="N" >Próxima</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >mcrypt_enc_self_test</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.mcrypt.html" ACCESSKEY="U" >Acima</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >mcrypt_generic_deinit</TD ></TR ></TABLE ></DIV ></BODY ></HTML >