1: Working with Strings in .NET framework

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1: Working with Strings
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In order for this listing to work, PHP must be compiled with support for the mcrypt extension (you can obtain instructions from the PHP manual at http://wwwphpnet/mcrypt)
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The previous listing uses two user-defined functions: encryptString() and decryptString() Internally, both use functions provided by PHP s ext/mcrypt extension, which supports a wide variety of encryption algorithms (Blowfish, DES, TripleDES, IDEA, Rijndael, Serpent, and others) and cipher modes (CBC, CFB, OFB, and ECB) Both functions accept a string and a key, and use the latter to encrypt or decrypt the former The encryptString() function begins by seeding the random number generator and then generating an initialization vector (IV) with the mcrypt_create_iv() function Once an IV has been generated, the mcrypt_encrypt() function performs the encryption using the supplied key The encryption in this example uses the Blowfish algorithm in CFB mode The IV is prepended to the encrypted string; this is normal and does not affect the security of the encryption The decryptString() function words in reverse, obtaining the IV size for the selected encryption algorithm and mode with the mcrypt_get_iv_size() function and then extracting the IV from the beginning of the encrypted string with the substr() function The IV, encrypted string, and key are then used by the mcrypt_ decrypt() function to retrieve the original cleartext string Read more about encryption algorithms and modes at http://enwikipedia org/wiki/Encryption_algorithm
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124 Generating Pronounceable Passwords
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You want to generate a pronounceable password
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Use PEAR s Text_Password class:
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< php // include Text_Password class include "Text/Passwordphp";
PHP Programming Solutions
// create object $tp = new Text_Password(); // generate pronounceable password // result: "sawralaeje" (example) $password = $tp->create(); echo $password; >
Comments
If you re looking for a quick way to generate pronounceable passwords perhaps for a Web site authentication system look no further than the PEAR Text_Password class (available from http://pearphpnet/package/Text_Password) By default, the class method create() generates a ten-character pronounceable password using only vowels and consonants You can define a custom length for the password by passing an optional size argument to the create() method, as follows:
< php // include Text_Password class include "Text/Passwordphp"; // create object $tp = new Text_Password(); // generate 5-character pronounceable password // result: "ookel" (example) $password = $tp->create(5); echo $password; >
125 Generating Unpronounceable Passwords
Problem
You want to generate an unpronounceable password
1: Working with Strings
Solution
Use PEAR s Text_Password class with some additional parameters:
< php // include Text_Password class include "Text/Passwordphp"; // create object $tp = new Text_Password(); // generate 7-character unpronounceable password // result: "_nCx&h#" (example) $password = $tp->create(7, 'unpronounceable'); echo $password; >
Comments
The PEAR Text_Password class (available from http://pearphpnet/ package/Text_Password) is designed specifically to generate both pronounceable and unpronouceable passwords of varying lengths To generate an unpronounceable password made up of alphabets, numbers, and special characters, call the class method create() with two additional flags: the desired password size and the keyword unpronounceable (the default behavior is to generate pronounceable passwords ten characters long) If you d like to restrict the characters that can appear in the password, you can pass the create() method a third argument: either of the keywords 'numeric' or 'alphanumeric', or a comma-separated list of allowed characters The following code snippets illustrate this:
< php // include Text_Password class include "Text/Passwordphp"; // create object $tp = new Text_Password(); // generate 7-character unpronounceable password // using only numbers // result: "0010287" (example) $password = $tp->create(7, 'unpronounceable', 'numeric'); echo $password; >
PHP Programming Solutions
< php // include Text_Password class include "Text/Passwordphp"; // create object $tp = new Text_Password(); // generate 12-character unpronounceable password // using only letters and numbers // result: "P44g62gk6YIp" (example) $password = $tp->create(12, 'unpronounceable', 'alphanumeric'); echo $password; > < php // include Text_Password class include "Text/Passwordphp"; // create object $tp = new Text_Password(); // generate 5-character unpronounceable password // using a pre-defined character list // result: "okjnn" (example) $password = $tp->create(5, 'unpronounceable', 'i,j,k,l,m,n,o,p'); echo $password; >
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