#include <string.h>

       #include <openssl/objects.h>

       #include <openssl/dsa.h>

      

       int    main()

       {

              int                         ret;

              DSA                            *d;

              int                         i,bits=1024,signlen,datalen,alg,nid;

              unsigned chardata[100],signret[200];

      

              d=DSA_new();

              ret=DSA_generate_parameters_ex(d,512,NULL,0,NULL,NULL,NULL);

              if(ret!=1)

              {

                     DSA_free(d);

                     return -1;

              }

              ret=DSA_generate_key(d);

              if(ret!=1)

              {

                     DSA_free(d);

                     return -1;

              }

              for(i=0;i<100;i++)

                     memset(&data[i],i+1,1);

              printf("please select digest alg: \n");

              printf("1.NID_md5\n");

              printf("2.NID_sha\n");

              printf("3.NID_sha1\n");

              printf("4.NID_md5_sha1\n");

              scanf("%d",&alg);

              if(alg==1)

              {

                     datalen=20;

                     nid=NID_md5;

              }

              else if(alg==2)

              {

                     datalen=20;

                     nid=NID_sha;

              }

              else if(alg==3)

              {

                     datalen=20;

                     nid=NID_sha1;

              }

              else if(alg==4)

              {

                     datalen=20;

                     nid=NID_md5_sha1;

              }

              ret=DSA_sign(nid,data,datalen,signret,&signlen,d);

              if(ret!=1)

              {

                     printf("DSA_sign err!\n");

                     DSA_free(d);

                     return -1;

              }

              ret=DSA_verify(nid,data,datalen,signret,signlen,d);

              if(ret!=1)

              {

                     printf("DSA_verify err!\n");

                     DSA_free(d);

                     return -1;

              }

              DSA_free(d);

              printf("test ok!\n");

              return 0;

       }