#include <openssl/rand.h>
#include <openssl/sha.h>
-static int bnrand(int pseudorand, BIGNUM *rnd, int bits, int top, int bottom)
+typedef enum bnrand_flag_e {
+ NORMAL, TESTING, PRIVATE
+} BNRAND_FLAG;
+
+static int bnrand(BNRAND_FLAG flag, BIGNUM *rnd, int bits, int top, int bottom)
{
unsigned char *buf = NULL;
- int ret = 0, bit, bytes, mask;
- time_t tim;
-
- if (bits < 0 || (bits == 1 && top > 0)) {
- BNerr(BN_F_BNRAND, BN_R_BITS_TOO_SMALL);
- return 0;
- }
+ int b, ret = 0, bit, bytes, mask;
if (bits == 0) {
+ if (top != BN_RAND_TOP_ANY || bottom != BN_RAND_BOTTOM_ANY)
+ goto toosmall;
BN_zero(rnd);
return 1;
}
+ if (bits < 0 || (bits == 1 && top > 0))
+ goto toosmall;
bytes = (bits + 7) / 8;
bit = (bits - 1) % 8;
}
/* make a random number and set the top and bottom bits */
- time(&tim);
- RAND_add(&tim, sizeof(tim), 0.0);
-
- if (RAND_bytes(buf, bytes) <= 0)
+ b = flag == NORMAL ? RAND_bytes(buf, bytes) : RAND_priv_bytes(buf, bytes);
+ if (b <= 0)
goto err;
- if (pseudorand == 2) {
+ if (flag == TESTING) {
/*
* generate patterns that are more likely to trigger BN library bugs
*/
OPENSSL_clear_free(buf, bytes);
bn_check_top(rnd);
return (ret);
+
+toosmall:
+ BNerr(BN_F_BNRAND, BN_R_BITS_TOO_SMALL);
+ return 0;
}
int BN_rand(BIGNUM *rnd, int bits, int top, int bottom)
{
- return bnrand(0, rnd, bits, top, bottom);
+ return bnrand(NORMAL, rnd, bits, top, bottom);
}
-int BN_pseudo_rand(BIGNUM *rnd, int bits, int top, int bottom)
+int BN_bntest_rand(BIGNUM *rnd, int bits, int top, int bottom)
{
- return bnrand(1, rnd, bits, top, bottom);
+ return bnrand(TESTING, rnd, bits, top, bottom);
}
-int BN_bntest_rand(BIGNUM *rnd, int bits, int top, int bottom)
+int BN_priv_rand(BIGNUM *rnd, int bits, int top, int bottom)
{
- return bnrand(2, rnd, bits, top, bottom);
+ return bnrand(PRIVATE, rnd, bits, top, bottom);
}
/* random number r: 0 <= r < range */
-static int bn_rand_range(int pseudo, BIGNUM *r, const BIGNUM *range)
+static int bnrand_range(BNRAND_FLAG flag, BIGNUM *r, const BIGNUM *range)
{
- int (*bn_rand) (BIGNUM *, int, int, int) =
- pseudo ? BN_pseudo_rand : BN_rand;
- int n;
+ int b, n;
int count = 100;
if (range->neg || BN_is_zero(range)) {
- BNerr(BN_F_BN_RAND_RANGE, BN_R_INVALID_RANGE);
+ BNerr(BN_F_BNRAND_RANGE, BN_R_INVALID_RANGE);
return 0;
}
* than range
*/
do {
- if (!bn_rand(r, n + 1, BN_RAND_TOP_ANY, BN_RAND_BOTTOM_ANY))
+ b = flag == NORMAL
+ ? BN_rand(r, n + 1, BN_RAND_TOP_ANY, BN_RAND_BOTTOM_ANY)
+ : BN_priv_rand(r, n + 1, BN_RAND_TOP_ANY, BN_RAND_BOTTOM_ANY);
+ if (!b)
return 0;
/*
* If r < 3*range, use r := r MOD range (which is either r, r -
}
if (!--count) {
- BNerr(BN_F_BN_RAND_RANGE, BN_R_TOO_MANY_ITERATIONS);
+ BNerr(BN_F_BNRAND_RANGE, BN_R_TOO_MANY_ITERATIONS);
return 0;
}
} else {
do {
/* range = 11..._2 or range = 101..._2 */
- if (!bn_rand(r, n, BN_RAND_TOP_ANY, BN_RAND_BOTTOM_ANY))
+ if (!BN_rand(r, n, BN_RAND_TOP_ANY, BN_RAND_BOTTOM_ANY))
return 0;
if (!--count) {
- BNerr(BN_F_BN_RAND_RANGE, BN_R_TOO_MANY_ITERATIONS);
+ BNerr(BN_F_BNRAND_RANGE, BN_R_TOO_MANY_ITERATIONS);
return 0;
}
}
int BN_rand_range(BIGNUM *r, const BIGNUM *range)
{
- return bn_rand_range(0, r, range);
+ return bnrand_range(NORMAL, r, range);
+}
+
+int BN_priv_rand_range(BIGNUM *r, const BIGNUM *range)
+{
+ return bnrand_range(PRIVATE, r, range);
+}
+
+int BN_pseudo_rand(BIGNUM *rnd, int bits, int top, int bottom)
+{
+ return BN_rand(rnd, bits, top, bottom);
}
int BN_pseudo_rand_range(BIGNUM *r, const BIGNUM *range)
{
- return bn_rand_range(1, r, range);
+ return BN_rand_range(r, range);
}
/*
err:
OPENSSL_free(k_bytes);
+ OPENSSL_cleanse(private_bytes, sizeof(private_bytes));
return ret;
}