RE: Using libcrypto in a shared library

[Ted Mittelstaedt]

Maybe 
creating the library with ld rather than gcc might work 
better?

Ted

  -Original Message-From: 
  [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]On 
  Behalf Of BorisSent: Wednesday, February 02, 2005 2:58 
  PMTo: openssl-users@openssl.orgSubject: Using libcrypto 
  in a shared library
  Hi
  I'm having troubles using libcrypto in a shared library. Here is what I 
  did:
  1. I'm on RedHat 7.2
  2. I installed OpenSSL by "./config shared" andgot 
  /usr/local/ssl/lib/libcrypto.so
  3. I wrote a sample library calling EVA functions (the library source 
  attached below - decrypt.c)
  4. I compiled the decrypt.c as follows:
  
  gcc -fpic -c decrypt.c -o decrypt.o -I/usr/local/ssl/include
  gcc -shared decrypt.o -o libdecrypt.so -L/usr/local/ssl/lib 
-lcrypto
  
  5. I added current and the OpenSSL directories to the library path:
  LD_LIBRARY_PATH=$(pwd):/usr/local/ssl/lib
  
  When I try to run the testlib program (source attached below) the program 
  fails on dlopen()
  
  Could someone please advise, whatam I doing wrong?
  
  Thanks in advance
  
  
  // decrypt.c
  #include "testlib.h"#include stdio.h#include 
  openssl/evp.h#include fcntl.h
  
  int test_decrypt(){
   int >int encfd; unsigned char 
  outbuf[1032]; int olen, tlen, n; char 
  inbuff[1032]; EVP_CIPHER_CTX ctx; unsigned char 
  key[16]; unsigned char iv[8]; char *encfile = 
  "blowfish_enc";
  
   memset (key, 0, 16); memset (iv, 0, 
  8); strcpy(key,"1234567890123456"); 
  strcpy(iv,"12345678");  if ((encfd = open (encfile, 
  O_RDONLY)) == -1) { return onerr; } 
  memset (inbuff, 0, sizeof(inbuff)); if ((n = read (encfd, 
  inbuff, sizeof(inbuff))) == -1) { 
  close(encfd);  return onerr; 
  } close (encfd);
   EVP_CIPHER_CTX_init (ctx); EVP_DecryptInit 
  (ctx, EVP_bf_cbc (), key, iv);
   memset (outbuf, 0, sizeof(outbuf)); if 
  (EVP_DecryptUpdate (ctx, outbuf, olen, inbuff, n) != 1) 
  { return onerr; } if (EVP_DecryptFinal 
  (ctx, outbuf + olen, tlen) != 1) { return 
  onerr; } olen += tlen;
   printf("Output: %s", outbuf);
   return 0;}
  // testlib.c
  #include stdio.h#include stdlib.h#include 
  unistd.h#include dlfcn.h
  
  int main(int argc, char **argv){void *handle;int 
  (*test_decrypt)(void);char *c;
  
  handle = dlopen("libdecrypt.so", 1);c = 
  dlerror();if(c){fprintf(stderr, "couldnt 
  open library\n");abort();}test_decrypt = 
  dlsym(handle, "test_decrypt");c = 
  dlerror();if(c){fprintf(stderr, "couldnt 
  get function 
  symbol\n");abort();}test_decrypt();dlclose(handle);return 
  0;}

Re: Using libcrypto in a shared library

[Zerg]

May be "export" will help you.
export LD_LIBRARY_PATH=$(pwd):/usr/local/ssl/lib

Re: Using libcrypto in a shared library

[Boris]

thanks I will check the ld

  - Original Message - 
  From: 
  Ted 
  Mittelstaedt 
  To: openssl-users@openssl.org 
  Sent: Thursday, February 03, 2005 10:59 
  AM
  Subject: RE: Using libcrypto in a shared 
  library
  
  Maybe creating the library with ld rather than gcc might work 
  better?
  
  Ted
  
-Original Message-From: [EMAIL PROTECTED] 
[mailto:[EMAIL PROTECTED]On Behalf Of 
BorisSent: Wednesday, February 02, 2005 2:58 PMTo: 
openssl-users@openssl.orgSubject: 
Using libcrypto in a shared library
Hi
I'm having troubles using libcrypto in a shared library. Here is what I 
did:
1. I'm on RedHat 7.2
2. I installed OpenSSL by "./config shared" andgot 
/usr/local/ssl/lib/libcrypto.so
3. I wrote a sample library calling EVA functions (the library source 
attached below - decrypt.c)
4. I compiled the decrypt.c as follows:

gcc -fpic -c decrypt.c -o decrypt.o -I/usr/local/ssl/include
gcc -shared decrypt.o -o libdecrypt.so -L/usr/local/ssl/lib 
-lcrypto

5. I added current and the OpenSSL directories to the library 
path:
LD_LIBRARY_PATH=$(pwd):/usr/local/ssl/lib

When I try to run the testlib program (source attached below) the 
program fails on dlopen()

Could someone please advise, whatam I doing wrong?

Thanks in advance


// decrypt.c
#include "testlib.h"#include stdio.h#include 
openssl/evp.h#include fcntl.h

int test_decrypt(){
 int >int encfd; unsigned char 
outbuf[1032]; int olen, tlen, n; char 
inbuff[1032]; EVP_CIPHER_CTX ctx; unsigned char 
key[16]; unsigned char iv[8]; char *encfile = 
"blowfish_enc";

 memset (key, 0, 16); memset (iv, 0, 
8); strcpy(key,"1234567890123456"); 
strcpy(iv,"12345678");  if ((encfd = open (encfile, 
O_RDONLY)) == -1) { return onerr; 
} memset (inbuff, 0, sizeof(inbuff)); if ((n = read 
(encfd, inbuff, sizeof(inbuff))) == -1) { 
close(encfd);  return 
onerr; } close (encfd);
 EVP_CIPHER_CTX_init (ctx); EVP_DecryptInit 
(ctx, EVP_bf_cbc (), key, iv);
 memset (outbuf, 0, sizeof(outbuf)); if 
(EVP_DecryptUpdate (ctx, outbuf, olen, inbuff, n) != 1) 
{ return onerr; } if (EVP_DecryptFinal 
(ctx, outbuf + olen, tlen) != 1) { return 
onerr; } olen += tlen;
 printf("Output: %s", outbuf);
 return 0;}
// testlib.c
#include stdio.h#include stdlib.h#include 
unistd.h#include dlfcn.h

int main(int argc, char **argv){void 
*handle;int (*test_decrypt)(void);char *c;

handle = dlopen("libdecrypt.so", 1);c = 
dlerror();if(c){fprintf(stderr, "couldnt 
open library\n");abort();}test_decrypt = 
dlsym(handle, "test_decrypt");c = 
dlerror();if(c){fprintf(stderr, "couldnt 
get function 
symbol\n");abort();}test_decrypt();dlclose(handle);return 
0;}

Re: Using libcrypto in a shared library

[Boris]

Thanks a lot. That was it.
That's what happens when you try to do complex 
stuff without practicing the basics. Unfortunately we (I) don't always have the 
time to attend courses - we just need to get the job done.


- Original Message - 

  From: 
  Zerg 
  To: openssl-users@openssl.org 
  Sent: Thursday, February 03, 2005 12:48 
  PM
  Subject: Re: Using libcrypto in a shared 
  library
  
  May be "export" will help you.
  export LD_LIBRARY_PATH=$(pwd):/usr/local/ssl/lib
  

Using libcrypto in a shared library

[Boris]

Hi
I'm having troubles using libcrypto in a shared library. Here is what I 
did:
1. I'm on RedHat 7.2
2. I installed OpenSSL by "./config shared" andgot 
/usr/local/ssl/lib/libcrypto.so
3. I wrote a sample library calling EVA functions (the library source 
attached below - decrypt.c)
4. I compiled the decrypt.c as follows:

gcc -fpic -c decrypt.c -o decrypt.o -I/usr/local/ssl/include
gcc -shared decrypt.o -o libdecrypt.so -L/usr/local/ssl/lib -lcrypto

5. I added current and the OpenSSL directories to the library path:
LD_LIBRARY_PATH=$(pwd):/usr/local/ssl/lib

When I try to run the testlib program (source attached below) the program 
fails on dlopen()

Could someone please advise, whatam I doing wrong?

Thanks in advance


// decrypt.c
#include "testlib.h"#include stdio.h#include 
openssl/evp.h#include fcntl.h

int test_decrypt(){
 int >int encfd; unsigned char 
outbuf[1032]; int olen, tlen, n; char 
inbuff[1032]; EVP_CIPHER_CTX ctx; unsigned char 
key[16]; unsigned char iv[8]; char *encfile = 
"blowfish_enc";

 memset (key, 0, 16); memset (iv, 0, 
8); strcpy(key,"1234567890123456"); 
strcpy(iv,"12345678");  if ((encfd = open (encfile, 
O_RDONLY)) == -1) { return onerr; } 
memset (inbuff, 0, sizeof(inbuff)); if ((n = read (encfd, inbuff, 
sizeof(inbuff))) == -1) { close(encfd); 
 return onerr; } close 
(encfd);
 EVP_CIPHER_CTX_init (ctx); EVP_DecryptInit (ctx, 
EVP_bf_cbc (), key, iv);
 memset (outbuf, 0, sizeof(outbuf)); if 
(EVP_DecryptUpdate (ctx, outbuf, olen, inbuff, n) != 1) 
{ return onerr; } if (EVP_DecryptFinal 
(ctx, outbuf + olen, tlen) != 1) { return 
onerr; } olen += tlen;
 printf("Output: %s", outbuf);
 return 0;}
// testlib.c
#include stdio.h#include stdlib.h#include 
unistd.h#include dlfcn.h

int main(int argc, char **argv){void *handle;int 
(*test_decrypt)(void);char *c;

handle = dlopen("libdecrypt.so", 1);c = 
dlerror();if(c){fprintf(stderr, "couldnt 
open library\n");abort();}test_decrypt = 
dlsym(handle, "test_decrypt");c = 
dlerror();if(c){fprintf(stderr, "couldnt get 
function 
symbol\n");abort();}test_decrypt();dlclose(handle);return 
0;}