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/c...8?q=md5+hash&rnum=3&hl=pt-BR#bd4b37481e4d0b48

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

 

[Eric Sosman]

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/c...8?q=md5+hash&rnum=3&hl=pt-BR#bd4b37481e4d0b48

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

The RFC that defines MD5 contains a sample C
implementation.

 

[osmium]

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/c...8?q=md5+hash&rnum=3&hl=pt-BR#bd4b37481e4d0b48

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

Did you look at this?

http://www.faqs.org/rfcs/rfc1321.html

 

[dutche]

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.

Thanks

 

[james.jdunne]

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.

Thanks

Please, learn how to ask an intelligent, useful question. Then someone
may help you without wasting posts asking for this and that.

With that said, here is the minimal amount of information needed to
help you:

1) Are you using separate source files? Do you have the MD5
implementation in a separate file or did you copy/paste it into
mddriver.c?
2) What are the errors you get from gcc (please copy/paste, don't
summarize)?
3) What are the relevant source files involved in your project?

At this point, I'd suggest, for simplicity's sake, to simply copy/paste
the MD5 code to the TOP of your mddriver.c source file and place your
int main() function at the bottom of the source file.

 

[Default User]

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.

Please quote a relevant portion of the previous message for context.
Check CB Falconer messages for instructions.

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.

And what are we supposed to do, psychically divine what code you are
trying?




Brian

 

[dutche]

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)
mddriver.c:114: error: `MD5' undeclared (first use in this function)
mddriver.c: In function `MDTimeTrial':
mddriver.c:124: error: `MD_CTX' undeclared (first use in this function)
mddriver.c:124: error: parse error before "context"
mddriver.c:130: error: `MD5' undeclared (first use in this function)
mddriver.c:141: error: `context' undeclared (first use in this
function)
mddriver.c: In function `MDTestSuite':
mddriver.c:162: error: `MD5' undeclared (first use in this function)
mddriver.c: In function `MDFile':
mddriver.c:183: error: `MD_CTX' undeclared (first use in this function)
mddriver.c:183: error: parse error before "context"
mddriver.c:191: error: `context' undeclared (first use in this
function)
mddriver.c:198: error: `MD5' undeclared (first use in this function)
mddriver.c: In function `MDFilter':
mddriver.c:208: error: `MD_CTX' undeclared (first use in this function)
mddriver.c:208: error: parse error before "context"
mddriver.c:212: error: `context' undeclared (first use in this
function)



I'm using a Slackware Linux 10.1 with gcc-3.3.4-i486-1.

Sorry for the few arguments in the last post.

 

[Chris Hulbert]

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)
mddriver.c:114: error: `MD5' undeclared (first use in this function)
mddriver.c: In function `MDTimeTrial':
mddriver.c:124: error: `MD_CTX' undeclared (first use in this function)
mddriver.c:124: error: parse error before "context"
mddriver.c:130: error: `MD5' undeclared (first use in this function)
mddriver.c:141: error: `context' undeclared (first use in this
function)
mddriver.c: In function `MDTestSuite':
mddriver.c:162: error: `MD5' undeclared (first use in this function)
mddriver.c: In function `MDFile':
mddriver.c:183: error: `MD_CTX' undeclared (first use in this function)
mddriver.c:183: error: parse error before "context"
mddriver.c:191: error: `context' undeclared (first use in this
function)
mddriver.c:198: error: `MD5' undeclared (first use in this function)
mddriver.c: In function `MDFilter':
mddriver.c:208: error: `MD_CTX' undeclared (first use in this function)
mddriver.c:208: error: parse error before "context"
mddriver.c:212: error: `context' undeclared (first use in this
function)



I'm using a Slackware Linux 10.1 with gcc-3.3.4-i486-1.

Sorry for the few arguments in the last post.

This newsgroup isn't really for helping you learn to compile C code.
Nonetheless, notice you have multiple source files, but only used one
of them in your compile statement. Try something more like:

gcc -c -v -Wall -I. -omd5.o md5.c
gcc -c -v -Wall -I. -omddriver.o mddriver.c
gcc -omddriver mddriver.o md5.o

 

[Mark]

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

 

[dutche]

In the first compile I got errors:
The command:
gcc -c -v -Wall -I. -omd5.o md5c.c

The errors:

GGC heuristics: --param ggc-min-expand=46 --param
ggc-min-heapsize=31005
ignoring nonexistent directory "/usr/i486-slackware-linux/include"
#include "..." search starts here:
#include <...> search starts here:
.
/usr/local/include
/usr/lib/gcc-lib/i486-slackware-linux/3.3.4/include
/usr/include
End of search list.
md5c.c:81: error: parse error before '+=' token
md5c.c:81:13: warning: backslash and newline separated by space
md5c.c: In function `MD5Transform':
md5c.c:340: error: parse error at end of input
md5c.c:50: warning: `Encode' declared `static' but never defined
md5c.c:52: warning: `Decode' declared `static' but never defined
md5c.c:54: warning: `MD5_memcpy' declared `static' but never defined
md5c.c:55: warning: `MD5_memset' declared `static' but never defined


Thanks for help

 

[Mark]

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]

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]

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]

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

Please, learn how NOT to be a rude asswipe.

 

[Martin Ambuhl]

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]

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.