Differential D31843 Diff 94683 crypto/libcrypto/bn/div/divtest.c

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

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

				static void bug(const 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);
				exit(1);
				}

				int
				main(int argc, char *argv[])
				{
				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();
				int i = 0;

				for (i = 0; i < 10000; i++) {
				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);
				}
				exit(0);
				}