Need help with SHA1

[ruben.de.visscher]

Hi,

I want to make a program that checks the SHA1 message digest of a
password from the user with a list of usernames and the corresponding
message digests of their passwords. The problem is, that it simply
refuses to recognize the SHA1( ) function i use in the program. I
looked in the headerfile i included ( <openssl/sha.h> ) and the
prototype is clearly in there, but it still does'nt work! Do i have to
supply additional compiler flags or something?

Ruben

 

[Jirka Klaue]

(e-mail address removed):
....

The problem is, that it simply
refuses to recognize the SHA1( ) function i use in the program. I
looked in the headerfile i included ( <openssl/sha.h> ) and the
prototype is clearly in there, but it still does'nt work! Do i have to
supply additional compiler flags or something?

May be. How about -lssl?

Jirka

 

[Keith Thompson]

I want to make a program that checks the SHA1 message digest of a
password from the user with a list of usernames and the corresponding
message digests of their passwords. The problem is, that it simply
refuses to recognize the SHA1( ) function i use in the program. I
looked in the headerfile i included ( <openssl/sha.h> ) and the
prototype is clearly in there, but it still does'nt work! Do i have to
supply additional compiler flags or something?

The statement "it doesn't work" is almost always an indication that
you aren't giving us enough information.

How exactly does it not work? What error message are you getting?
For all we know, you could be running out of disk space, or somebody
could be unplugging your monitor every time you try to compile the
code.

 

[Wolfgang Riedel]

(e-mail address removed):
...

May be. How about -lssl?

Jirka

(additionally)

-lcrypto

might help too

Wolfgang

 

[RubenDV]

Yes! i used the -lcrypto flag ( thanks Wolfgang Riedel ) and it worked!
To Keith Thompson, when i tried to compile it, it produced the
following output:

ld: Undefined symbols:
_SHA1

When i used -lssl it said "illegal reference to symbol _SHA1" but with
the other flag it worked perfectly!

Ruben