Add BN_rand_range_ex and use internally.
There are many cases where we need |BN_rand_range| but with a minimum
value other than 0. |BN_rand_range_ex| provides that.
Change-Id: I564326c9206bf4e20a37414bdbce16a951c148ce
Reviewed-on: https://boringssl-review.googlesource.com/8921
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
diff --git a/include/openssl/bn.h b/include/openssl/bn.h
index a686696..51a63e6 100644
--- a/include/openssl/bn.h
+++ b/include/openssl/bn.h
@@ -436,6 +436,10 @@
* less than, equal to or greater than |b|, respectively. */
OPENSSL_EXPORT int BN_cmp(const BIGNUM *a, const BIGNUM *b);
+/* BN_cmp_word is like |BN_cmp| except it takes its second argument as a
+ * |BN_ULONG| instead of a |BIGNUM|. */
+int BN_cmp_word(const BIGNUM *a, BN_ULONG b);
+
/* BN_ucmp returns a value less than, equal to or greater than zero if the
* absolute value of |a| is less than, equal to or greater than the absolute
* value of |b|, respectively. */
@@ -587,10 +591,16 @@
/* BN_pseudo_rand is an alias for |BN_rand|. */
OPENSSL_EXPORT int BN_pseudo_rand(BIGNUM *rnd, int bits, int top, int bottom);
-/* BN_rand_range sets |rnd| to a random value [0..range). It returns one on
- * success and zero otherwise. */
+/* BN_rand_range is equivalent to |BN_rand_range_ex| with |min_inclusive| set
+ * to zero and |max_exclusive| set to |range|. */
OPENSSL_EXPORT int BN_rand_range(BIGNUM *rnd, const BIGNUM *range);
+/* BN_rand_range_ex sets |rnd| to a random value in
+ * [min_inclusive..max_exclusive). It returns one on success and zero
+ * otherwise. */
+OPENSSL_EXPORT int BN_rand_range_ex(BIGNUM *r, BN_ULONG min_inclusive,
+ const BIGNUM *max_exclusive);
+
/* BN_pseudo_rand_range is an alias for BN_rand_range. */
OPENSSL_EXPORT int BN_pseudo_rand_range(BIGNUM *rnd, const BIGNUM *range);
