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divtest.c
#include <openssl/bn.h>
#include <openssl/rand.h>

static int Rand(n)
{
    unsigned char x[2];
    RAND_pseudo_bytes(x,2);
    return (x[0] + 2*x[1]);
}

static void bug(char *m, BIGNUM *a, BIGNUM *b)
{
    printf("%s!\na=",m);
    BN_print_fp(stdout, a);
    printf("\nb=");
    BN_print_fp(stdout, b);
    printf("\n");
    fflush(stdout);
}

main()
{
    BIGNUM *a=BN_new(), *b=BN_new(), *c=BN_new(), *d=BN_new(),
      *C=BN_new(), *D=BN_new();
    BN_RECP_CTX *recp=BN_RECP_CTX_new();
    BN_CTX *ctx=BN_CTX_new();

    for(;;) {
      BN_pseudo_rand(a,Rand(),0,0);
      BN_pseudo_rand(b,Rand(),0,0);
      if (BN_is_zero(b)) continue;

      BN_RECP_CTX_set(recp,b,ctx);
      if (BN_div(C,D,a,b,ctx) != 1)
          bug("BN_div failed",a,b);
      if (BN_div_recp(c,d,a,recp,ctx) != 1)
          bug("BN_div_recp failed",a,b);
      else if (BN_cmp(c,C) != 0 || BN_cmp(c,C) != 0)
          bug("mismatch",a,b);
    }
}

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