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  1. #1
    Senior Member
    Join Date
    Jan 2014
    Location
    Banglore
    Posts
    289

    PEAR::Crypt_HMAC

    The Crypt_HMAC class implements the algorithm as described in RFC 2104 and can be installed with pear install crypt_hmac. Letís look at it:


    class Crypt_HMAC {
    /**
    * Constructor
    * Pass method as first parameter
    *
    * @param string method - Hash function used for the calculation
    * @return void
    * @access public
    */
    function Crypt_HMAC($key, $method = 'md5')
    {
    if (!in_array($method, array('sha1', 'md5'))) {
    die("Unsupported hash function '$method'.");
    }
    $this->_func = $method;
    /* Pad the key as the RFC wishes (step 1) */
    if (strlen($key) > 64) {
    $key = pack('H32', $method($key));
    }
    if (strlen($key) < 64) {
    $key = str_pad($key, 64, chr(0));
    }
    /* Calculate the padded keys and save them (step 2 & 3) */
    $this->_ipad = substr($key, 0, 64) ^ str_repeat(chr(0x36),
    ➥64);
    $this->_opad = substr($key, 0, 64) ^ str_repeat(chr(0x5C),
    ➥64);
    }

  2. #2
    Senior Member
    Join Date
    Jan 2015
    Posts
    567

    Re: PEAR::Crypt_HMAC

    Very nice example for this.

 

 

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