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#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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