CODEWITHSUNDEEP
c
Vineet Pandey
Vineet Pandey

Reputation: 3

Compile C program for DES using OpenSSL

I got a problem during compiling my C program for DES encrytion/decryption using OpenSSL project on ubuntu.The compiling command is :

gcc -o des_cbc des_cbc.c -lcrypt

and I got the following errors:

In function main':

des_cbc.c:(.text+0x1fb): undefined reference to `DES_set_key_checked'
des_cbc.c:(.text+0x283): undefined reference to `DES_encrypt1'
des_cbc.c:(.text+0x2da): undefined reference to `DES_encrypt1'
collect2: ld returned 1 exit status

Upvotes: 0

Views: 881

Answers (1)

Grady Player
Grady Player

Reputation: 14549

You are probably needing to add the -lssl flag... let me read the nm output of the libraries to see where those functions are...

EDIT:

Here is what I am seeing on my system, you shouldn't need the -lssl flag because, the symbols are showing up in the libcrypto library... 

nm /usr/lib/libcrypto.dylib | grep DES_set_key_checked
000000000008c9d0 T _DES_set_key_checked

and:

nm programing/src/openssl/libcrypto-1.0.0e.a | grep DES_set_key_checked
0000000000000340 T _DES_set_key_checked
0000000000000f00 S _DES_set_key_checked.eh

but it is possible that your version is missing these symbols because they were intentionally not compiled into the library.

Upvotes: 1

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