1 files changed, 85 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/pubkey/elgamal/elgamal.h b/comm/third_party/botan/src/lib/pubkey/elgamal/elgamal.h
new file mode 100644
index 0000000000..e4d932f6aa
--- /dev/null
+++ b/comm/third_party/botan/src/lib/pubkey/elgamal/elgamal.h
@@ -0,0 +1,85 @@
+/*
+* ElGamal
+* (C) 1999-2007 Jack Lloyd
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#ifndef BOTAN_ELGAMAL_H_
+#define BOTAN_ELGAMAL_H_
+
+#include <botan/dl_algo.h>
+
+namespace Botan {
+
+/**
+* ElGamal Public Key
+*/
+class BOTAN_PUBLIC_API(2,0) ElGamal_PublicKey : public virtual DL_Scheme_PublicKey
+   {
+   public:
+      std::string algo_name() const override { return "ElGamal"; }
+      DL_Group::Format group_format() const override { return DL_Group::ANSI_X9_42; }
+
+      /**
+      * Load a public key.
+      * @param alg_id the X.509 algorithm identifier
+      * @param key_bits DER encoded public key bits
+      */
+      ElGamal_PublicKey(const AlgorithmIdentifier& alg_id,
+                        const std::vector<uint8_t>& key_bits) :
+         DL_Scheme_PublicKey(alg_id, key_bits, DL_Group::ANSI_X9_42)
+         {}
+
+      /**
+      * Create a public key.
+      * @param group the underlying DL group
+      * @param y the public value y = g^x mod p
+      */
+      ElGamal_PublicKey(const DL_Group& group, const BigInt& y);
+
+      std::unique_ptr<PK_Ops::Encryption>
+         create_encryption_op(RandomNumberGenerator& rng,
+                              const std::string& params,
+                              const std::string& provider) const override;
+
+   protected:
+      ElGamal_PublicKey() = default;
+   };
+
+/**
+* ElGamal Private Key
+*/
+class BOTAN_PUBLIC_API(2,0) ElGamal_PrivateKey final : public ElGamal_PublicKey,
+                                     public virtual DL_Scheme_PrivateKey
+   {
+   public:
+      bool check_key(RandomNumberGenerator& rng, bool) const override;
+
+      /**
+      * Load a private key.
+      * @param alg_id the X.509 algorithm identifier
+      * @param key_bits DER encoded key bits in ANSI X9.42 format
+      */
+      ElGamal_PrivateKey(const AlgorithmIdentifier& alg_id,
+                         const secure_vector<uint8_t>& key_bits);
+
+      /**
+      * Create a private key.
+      * @param rng random number generator to use
+      * @param group the group to be used in the key
+      * @param priv_key the key's secret value (or if zero, generate a new key)
+      */
+      ElGamal_PrivateKey(RandomNumberGenerator& rng,
+                         const DL_Group& group,
+                         const BigInt& priv_key = 0);
+
+      std::unique_ptr<PK_Ops::Decryption>
+         create_decryption_op(RandomNumberGenerator& rng,
+                              const std::string& params,
+                              const std::string& provider) const override;
+   };
+
+}
+
+#endif