How to generate a md5 hash?

[dutche]

Hi, this is my first post here and I'm very very new in 'C'
programming.
And I began to 'translate' my PHP program, that beyond a lot of things
generates a md5 hash, and I must generate a md5 hash in 'C' , but I
cant found it anywhere.
I've readed the crypt.h man page, I read twice the post in
http://groups.google.com.br/group/co...4b37481e4d0b48

But I still dont know how to generate a md5 hash from my string
'testing' for example.

Plz, if anyone can help me I'd be glad

Thanks

[Mark]

"Mark" <so***@localbar .com> wrote in message
news:Vh******** ***********@new shog.newsread.c om...

"dutche" <du****@gmail.c om> wrote in message
news:11******** *************@g 49g2000cwa.goog legroups.com...

Yes, I've readed the entire RFC, but as I said...I'm very new in 'C'
and I copied the files that is in Appendix.

At this point, everything's fine...but when I try to compile
it...like...I donno how to compile those files togheter.

I tried 'gcc mddriver.c -o mddriver' , and a lot of errors appears to
me :/

I'm posting here cause I tried everything that I can with no results.

That's because the code provided with the RFC has a bug :-)
At approximately line 20 or mddriver.c replace the following line:

#define MD MD5
with
#define MD 5

That's should do the trick.

Regards,
Mark

Worth mentioning: You'll also need to compile md5.c
$ gcc md5.c mddriver.c -o [whatever]

Mark

[Mark]

"dutche" <du****@gmail.c om> wrote in message
news:11******** **************@ g43g2000cwa.goo glegroups.com.. .

First, I created these files:

global.h
md5.h
md5c.c
mddriver.c

Ok, I made it exactly as described but when I try to compile I dont got
any results, I think that I'm doing something wrong when compiling.

I've copied the source of the programs directly from the RFC site, and
the command that I used is: 'gcc mddriver.c -o mddriver' gcc md5.c mddriver.c -o mddriver

And the errors I got was...

caused by an bug in the code.
line 20 mddriver.c
#define MD MD5
should be
#define MD 5

[Old Wolf]

dutche wrote:

First, I created these files:

global.h
md5.h
md5c.c
mddriver.c

Ok, I made it exactly as described but when I try to compile I dont got
any results, I think that I'm doing something wrong when compiling.

I've copied the source of the programs directly from the RFC site, and
the command that I used is: 'gcc mddriver.c -o mddriver'

And the errors I got was...

mddriver.c: In function `MDString':
mddriver.c:106: error: `MD_CTX' undeclared (first use in this function)
mddriver.c:106: error: (Each undeclared identifier is reported only
once
mddriver.c:106: error: for each function it appears in.)
mddriver.c:106: error: parse error before "context"
mddriver.c:110: error: `context' undeclared (first use in this
function)

There are some errors in that source code at
http://www.faqs.org/rfcs/rfc1321.html :

md5c.c line 82 (the blank line) should be deleted
mddriver.c line 21 should read:
#define MD 5
instead of
#define MD MD5

Note that md5c.c contains the functions for performing an MD5
operation (suitable for embedding in another project), and
mddriver.c is a commandline program that you can use to
call these functions.
If all you want to do is add these functions to another project
of yours, then you only need md5c.c .

Note that you have to tell GCC about all the source files you
want to compile:

gcc -o mddriver mddriver.c md5c.c

It's also a good idea to enable warnings:

gcc -o mddriver mddriver.c md5c.c -Wextra -Wall -ansi -pedantic

mddriver.c has a couple of warnings when compiled with these
switches, but they are ones you can safely ignore.

Finally, the source code in that RFC is a little archaic,
if you do a 'locate md5.c' on your system you will probably turn
up a lot of other implementations of it. For example, the PHP
source code contains it.

[dutche]

Is that point that I need to reach, I found that md5.c is the functions
to generate a hash right?
But (as I said I'm new in 'C') I cant realize which function is the
"hash maker".

Sorry, I'm still reading the K&R book but not too familiarized yet.

[Red]

In article <11************ *********@g47g2 000cwa.googlegr oups.com>,
ja**********@gm ail.com says...

Please, learn how to ask an intelligent, useful question.

Please, learn how NOT to be a rude asswipe.

[Martin Ambuhl]

Red wrote:

In article <11************ *********@g47g2 000cwa.googlegr oups.com>,
ja**********@gm ail.com says...

Please, learn how to ask an intelligent, useful question.

Please, learn how NOT to be a rude asswipe.

While it is occasionally enjoyable to see a self-referential post, yours
is not at all amusing.

[CBFalconer]

Martin Ambuhl wrote:

Red wrote:

ja**********@gm ail.com says...

Please, learn how to ask an intelligent, useful question.

Please, learn how NOT to be a rude asswipe.

While it is occasionally enjoyable to see a self-referential post,
yours is not at all amusing.

No, but it does an admirable job of inciting PLONKs up and down the
seacoast.

--
Chuck F (cb********@yah oo.com) (cb********@wor ldnet.att.net)
Available for consulting/temporary embedded and systems.
<http://cbfalconer.home .att.net> USE worldnet address!