Expose two, rather internal, BIGNUM functions.
Android uses these for some conversions from Java formats. The code is
sufficiently bespoke that putting the conversion functions into
BoringSSL doesn't make a lot of sense, but the alternative is to expose
these ones.
Change-Id: If1362bc4a5c44cba4023c909e2ba6488ae019ddb
diff --git a/include/openssl/bn.h b/include/openssl/bn.h
index d986394..d8aa215 100644
--- a/include/openssl/bn.h
+++ b/include/openssl/bn.h
@@ -284,6 +284,22 @@
OPENSSL_EXPORT BN_ULONG BN_get_word(const BIGNUM *bn);
+/* Internal functions.
+ *
+ * These functions are useful for code that is doing low-level manipulations of
+ * BIGNUM values. However, be sure that no other function in this file does
+ * what you want before turning to these. */
+
+/* bn_correct_top decrements |bn->top| until |bn->d[top-1]| is non-zero or
+ * until |top| is zero. */
+OPENSSL_EXPORT void bn_correct_top(BIGNUM *bn);
+
+/* bn_wexpand ensures that |bn| has at least |words| works of space without
+ * altering its value. It returns one on success or zero on allocation
+ * failure. */
+OPENSSL_EXPORT BIGNUM *bn_wexpand(BIGNUM *bn, unsigned words);
+
+
/* BIGNUM pools.
*
* Certain BIGNUM operations need to use many temporary variables and
