You forgot to specify -L/opt/local/lib, so while it's reading the 1.0.1c headers, it's finding lion's built in 0.9.8 library.
Bob On 4 Jul 2012, at 18:29, mmdon...@aol.com wrote: > MacBook 2,1 Mac OS X 10.7.4 Xcode 4.3.3 > > MacPorts openssl @1.0.1c_0 (active) > > > When I attempt to compile the example at > > http://www.openssl.org/docs/crypto/EVP_DigestInit.html > > using > > gcc -Wall -I /opt/local/include -o mdtest mdtest.c > > I get the following errors from gcc: > > Undefined symbols for architecture x86_64: > "_OpenSSL_add_all_digests", referenced from: > _main in cc2OLVyU.o > "_EVP_get_digestbyname", referenced from: > _main in cc2OLVyU.o > "_EVP_MD_CTX_create", referenced from: > _main in cc2OLVyU.o > "_EVP_DigestInit_ex", referenced from: > _main in cc2OLVyU.o > "_EVP_DigestUpdate", referenced from: > _main in cc2OLVyU.o > "_EVP_DigestFinal_ex", referenced from: > _main in cc2OLVyU.o > "_EVP_MD_CTX_destroy", referenced from: > _main in cc2OLVyU.o > ld: symbol(s) not found for architecture x86_64 > collect2: ld returned 1 exit status > > When I grep for EVP_MD_CTX_create in /opt/local/include/openssl/evp.h > it is found, but not with the leading underscore, the same is true for > the other "undefined symbols" above. > > I have tried changing architecture to i386 and compiler > to cc, but results are the same. > > Any info would be appreciated. > > Thanks, > mmdonley > ================================================== > The example to which I refer is included herein. Two minor > revisions were necessary: (1) include string.h and (2) change > md_len to an unsigned int: > > #include <stdio.h> > #include <string.h> > #include <openssl/evp.h> > > int main(int argc, char *argv[]) > { > EVP_MD_CTX *mdctx; > const EVP_MD *md; > char mess1[] = "Test Message\n"; > char mess2[] = "Hello World\n"; > unsigned char md_value[EVP_MAX_MD_SIZE]; > unsigned md_len, i; > OpenSSL_add_all_digests(); > if(!argv[1]) { > printf("Usage: mdtest digestname\n"); > exit(1); > } > md = EVP_get_digestbyname(argv[1]); > if(!md) { > printf("Unknown message digest %s\n", argv[1]); > exit(1); > } > mdctx = EVP_MD_CTX_create(); > EVP_DigestInit_ex(mdctx, md, NULL); > EVP_DigestUpdate(mdctx, mess1, strlen(mess1)); > EVP_DigestUpdate(mdctx, mess2, strlen(mess2)); > EVP_DigestFinal_ex(mdctx, md_value, &md_len); > EVP_MD_CTX_destroy(mdctx); > printf("Digest is: "); > for(i = 0; i < md_len; i++) printf("%02x", md_value[i]); > printf("\n"); > > return 0; > } >
