Sophie: php-manual-ro-0:20051028-1 noarch

php-manual-ro-20051028-1.noarch.rpm

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>mcrypt_generic</H1
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><P
>    (PHP 4 &#62;= 4.0.2, PHP 5)</P
>mcrypt_generic&nbsp;--&nbsp;This function encrypts data</DIV
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><H2
>Description</H2
>string <B
CLASS="methodname"
>mcrypt_generic</B
> ( resource td, string data)<BR
></BR
><P
>&#13;     This function encrypts data. The data is padded with "<VAR
CLASS="literal"
>\0</VAR
>"
     to make sure the length of the data is n * blocksize. This
     function returns the encrypted data. Note that the length
     of the returned string can in fact be longer then the input,
     due to the padding of the data.
    </P
><P
>&#13;     If you want to store the encrypted data in a database make sure to store
     the entire string as returned by mcrypt_generic, or the string will not
     entirely decrypt properly.  If your original string is 10 characters long
     and the block size is 8 (use
     <A
HREF="function.mcrypt-enc-get-block-size.html"
><B
CLASS="function"
>mcrypt_enc_get_block_size()</B
></A
> to determine the
     blocksize), you would need at least 16 characters in your database field.
     Note the string returned by <A
HREF="function.mdecrypt-generic.html"
><B
CLASS="function"
>mdecrypt_generic()</B
></A
> will be
     16 characters as well...use <A
HREF="function.rtrim.html"
><B
CLASS="function"
>rtrim()</B
></A
>($str, "\0") to
     remove the padding.
    </P
><P
>&#13;     If you are for example storing the data in a MySQL database remember that
     varchar fields automatically have trailing spaces removed during
     insertion. As encrypted data can end in a space (ASCII 32), the data will
     be damaged by this removal.  Store data in a tinyblob/tinytext (or
     larger) field instead.
    </P
><P
>&#13;     The encryption handle should always be initialized with
     <A
HREF="function.mcrypt-generic-init.html"
><B
CLASS="function"
>mcrypt_generic_init()</B
></A
> with a key and an IV before
     calling this function. Where the encryption is done, you should free the
     encryption buffers by calling <A
HREF="function.mcrypt-generic-deinit.html"
><B
CLASS="function"
>mcrypt_generic_deinit()</B
></A
>.
     See <A
HREF="function.mcrypt-module-open.html"
><B
CLASS="function"
>mcrypt_module_open()</B
></A
> for an example.
    </P
><P
>&#13;     See also <A
HREF="function.mdecrypt-generic.html"
><B
CLASS="function"
>mdecrypt_generic()</B
></A
>,
     <A
HREF="function.mcrypt-generic-init.html"
><B
CLASS="function"
>mcrypt_generic_init()</B
></A
>, and
     <A
HREF="function.mcrypt-generic-deinit.html"
><B
CLASS="function"
>mcrypt_generic_deinit()</B
></A
>.
    </P
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