Modify BigInt constructors

Add static methods for very common (eg zero, one) or very uncommon (eg
ECSDA truncated integers) construction methods, instead of using C++
constructors for all of these.

Also adds from_s32 which allows creating a negative BigInt easily,
instead of -BigInt(-x) -> BigInt::from_s32(x)

1 files changed, 1 insertions, 1 deletions

diff --git a/src/lib/pubkey/elgamal/elgamal.h b/src/lib/pubkey/elgamal/elgamal.h
index 0c440df00..a316d9c50 100644
--- a/src/lib/pubkey/elgamal/elgamal.h
+++ b/src/lib/pubkey/elgamal/elgamal.h
@@ -72,7 +72,7 @@ class BOTAN_PUBLIC_API(2,0) ElGamal_PrivateKey final : public ElGamal_PublicKey,
       */
       ElGamal_PrivateKey(RandomNumberGenerator& rng,
                          const DL_Group& group,
-                         const BigInt& priv_key = 0);
+                         const BigInt& priv_key = BigInt::zero());
 
       std::unique_ptr<Public_Key> public_key() const override;