signing data

[Son . To . wh98]

I am trying to sign data using DSA. My code fails on
EVP_SignFinal().  It fails on line 92 in p_sign.c . I think there
is something wrong with the way I created EVP_MD_CTX structure
for EVP_SignInit(). Any help is appreciated. Here is my code

#include <openssl/evp.h>
#include <openssl/dsa.h>
#include <openssl/err.h>
#include <stdio.h>

int main(int argc, char* argv[])
{
  EVP_MD_CTX ctx;
  char data[]="this is junk";
  unsigned char signature[4096]={'\0'};
  unsigned int signature_len;
  DSA *dsa; 
  EVP_PKEY *pkey = NULL;
  int status;

  dsa = DSA_generate_parameters(512, NULL, 0, NULL, NULL, NULL, NULL);
  
  if( !dsa && !DSA_generate_key(dsa) )
    {
      printf("Can't generate DSA keys\n");
      return 0;
    }

  pkey = EVP_PKEY_new(); 
  EVP_PKEY_assign(pkey, EVP_PKEY_DSA, (char*)dsa);

  EVP_SignInit(&ctx, EVP_sha1()); /*something wrong here that causes
EVP_SignFinal to fail*/
  EVP_SignUpdate(&ctx, data, strlen(data));

  status = EVP_SignFinal(&ctx, signature, &signature_len, pkey);
  
  printf("%x\n",signature);
  if(!status)
    {
      ERR_print_errors_fp(stderr);
      exit (1);
    }
}

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