release/src/router/openssl/crypto/bn/divtest.c

   1 #include <openssl/bn.h>
   2 #include <openssl/rand.h>
   3
   4 static int Rand(n)
   5 {
   6     unsigned char x[2];
   7     RAND_pseudo_bytes(x, 2);
   8     return (x[0] + 2 * x[1]);
   9 }
  10
  11 static 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
  21 main()
  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 }