Add BN_native2bn and BN_bn2nativepad, for native BIGNUM import/export

These are a couple of utility functions, to make import and export of
BIGNUMs to byte strings in platform native for (little-endian or
big-endian) easier.

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/8346)

1 files changed, 18 insertions, 0 deletions

diff --git a/crypto/bn/bn_lib.c b/crypto/bn/bn_lib.c
index e624caf9b4..6de17c3b7a 100644
--- a/crypto/bn/bn_lib.c
+++ b/crypto/bn/bn_lib.c
@@ -536,6 +536,24 @@ int BN_bn2lebinpad(const BIGNUM *a, unsigned char *to, int tolen)
     return tolen;
 }
 
+BIGNUM *BN_native2bn(const unsigned char *s, int len, BIGNUM *ret)
+{
+#ifdef B_ENDIAN
+    return BN_bin2bn(s, len, ret);
+#else
+    return BN_lebin2bn(s, len, ret);
+#endif
+}
+
+int BN_bn2nativepad(const BIGNUM *a, unsigned char *to, int tolen)
+{
+#ifdef B_ENDIAN
+    return BN_bn2binpad(a, to, tolen);
+#else
+    return BN_bn2lebinpad(a, to, tolen);
+#endif
+}
+
 int BN_ucmp(const BIGNUM *a, const BIGNUM *b)
 {
     int i;