Databases
StackOverflow2013
Postsdbo
POGenerating Password Hash In PHP 5.5 And Setting Cost Option
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POGenerating Password Hash In PHP 5.5 And Setting Cost Option
    primarykey
    data
    text
    <p>I know PHP 5.5 is in alpha but this class I am making is just being made in advance to utilize it's hashing feature by using function_exists().</p> <p>I checked out the <a href="http://php.net/password_hash" rel="noreferrer"><code>password_hash</code></a> documentation. The 3rd argument is for $options which currently supports two options, 'salt' and 'cost'.</p> <p>It states the following:</p> <blockquote> <p>cost, which denotes the algorithmic cost that should be used. Examples of these values can be found on the crypt() page.</p> </blockquote> <p>When I go to the crypt() page the documentation it gives is:</p> <blockquote> <p>Blowfish hashing with a salt as follows: "$2a$", "$2x$" or "$2y$", a two digit cost parameter, "$", and 22 digits from the alphabet "./0-9A-Za-z". Using characters outside of this range in the salt will cause crypt() to return a zero-length string. The two digit cost parameter is the base-2 logarithm of the iteration count for the underlying Blowfish-based hashing algorithmeter and must be in range 04-31, values outside this range will cause crypt() to fail. Versions of PHP before 5.3.7 only support "$2a$" as the salt prefix: PHP 5.3.7 introduced the new prefixes to fix a security weakness in the Blowfish implementation. Please refer to » this document for full details of the security fix, but to summarise, developers targeting only PHP 5.3.7 and later should use "$2y$" in preference to "$2a$".</p> </blockquote> <p>I can't seem to get my head wrapped around this. It says PHP 5.3.7 and later should use $2y$, but what cost value do I use to get that one and is it the best value to choose? The example they provide uses a value of 7, but according to the above it can go up to 31, what difference does it make to use say 4 opposed to say 31?</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USSalman A
    1. UScryptic ツ
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POGenerating Password Hash In PHP 5.5 And Setting Cost Option
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POGenerating Password Hash In PHP 5.5 And Setting Cost Option
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POGenerating Password Hash In PHP 5.5 And Setting Cost Option
      1. This table or related slice is empty.
      1. VTUpMod
    1. COUntil you can find a reason to choose something other than the default values, (like when the defaults are demonstrably weak) why not just choose the default values and move on to the next issue? In my experience, the PHP default values for everything have gotten a lot better since PHP 5.3. Just a thought, ~Ray
      singulars
      1. POGenerating Password Hash In PHP 5.5 And Setting Cost Option
      1. USRay Paseur
    2. CO@RayPaseur, true. However, that still does not shed light onto how and why to specify different cost values. The PHP default may be secure, but at the minimum for possibly performance reasons. So depending on the production environment and security policy it may require something stronger. Just my thoughts. =o)
      singulars
      1. POGenerating Password Hash In PHP 5.5 And Setting Cost Option
      1. UScryptic ツ
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload