Revert PK_Verifier change (don't require RNG there).

Verification is deterministic and public, so really no RNG is ever needed.

Change provider handling - accepts "base", "openssl", or empty, otherwise
throws a Provider_Not_Found exception.

1 files changed, 8 insertions, 4 deletions

diff --git a/src/lib/pubkey/elgamal/elgamal.cpp b/src/lib/pubkey/elgamal/elgamal.cpp
index fbbd09226..046c2c3f6 100644
--- a/src/lib/pubkey/elgamal/elgamal.cpp
+++ b/src/lib/pubkey/elgamal/elgamal.cpp
@@ -186,17 +186,21 @@ ElGamal_Decryption_Operation::raw_decrypt(const byte msg[], size_t msg_len)
 std::unique_ptr<PK_Ops::Encryption>
 ElGamal_PublicKey::create_encryption_op(RandomNumberGenerator& /*rng*/,
                                         const std::string& params,
-                                        const std::string& /*provider*/) const
+                                        const std::string& provider) const
    {
-   return std::unique_ptr<PK_Ops::Encryption>(new ElGamal_Encryption_Operation(*this, params));
+   if(provider == "base" || provider.empty())
+      return std::unique_ptr<PK_Ops::Encryption>(new ElGamal_Encryption_Operation(*this, params));
+   throw Provider_Not_Found(algo_name(), provider);
    }
 
 std::unique_ptr<PK_Ops::Decryption>
 ElGamal_PrivateKey::create_decryption_op(RandomNumberGenerator& rng,
                                          const std::string& params,
-                                         const std::string& /*provider*/) const
+                                         const std::string& provider) const
    {
-   return std::unique_ptr<PK_Ops::Decryption>(new ElGamal_Decryption_Operation(*this, params, rng));
+   if(provider == "base" || provider.empty())
+      return std::unique_ptr<PK_Ops::Decryption>(new ElGamal_Decryption_Operation(*this, params, rng));
+   throw Provider_Not_Found(algo_name(), provider);
    }
 
 }