divtest.c revision 296465 
1#include <openssl/bn.h>
2#include <openssl/rand.h>
3
4static int Rand(n)
5{
6    unsigned char x[2];
7    RAND_pseudo_bytes(x, 2);
8    return (x[0] + 2 * x[1]);
9}
10
11static void bug(char *m, BIGNUM *a, BIGNUM *b)
12{
13    printf("%s!\na=", m);
14    BN_print_fp(stdout, a);
15    printf("\nb=");
16    BN_print_fp(stdout, b);
17    printf("\n");
18    fflush(stdout);
19}
20
21main()
22{
23    BIGNUM *a = BN_new(), *b = BN_new(), *c = BN_new(), *d = BN_new(),
24        *C = BN_new(), *D = BN_new();
25    BN_RECP_CTX *recp = BN_RECP_CTX_new();
26    BN_CTX *ctx = BN_CTX_new();
27
28    for (;;) {
29        BN_pseudo_rand(a, Rand(), 0, 0);
30        BN_pseudo_rand(b, Rand(), 0, 0);
31        if (BN_is_zero(b))
32            continue;
33
34        BN_RECP_CTX_set(recp, b, ctx);
35        if (BN_div(C, D, a, b, ctx) != 1)
36            bug("BN_div failed", a, b);
37        if (BN_div_recp(c, d, a, recp, ctx) != 1)
38            bug("BN_div_recp failed", a, b);
39        else if (BN_cmp(c, C) != 0 || BN_cmp(c, C) != 0)
40            bug("mismatch", a, b);
41    }
42}
43