From 08ffc1a49bb0f1a1a42a57d7c55bbf0d9b6b8336 Mon Sep 17 00:00:00 2001
From: Jack Lloyd <jack@randombit.net>
Date: Tue, 24 Oct 2017 11:51:12 -0400
Subject: Avoid using namespace, other cleanups

---
 src/cli/encryption.cpp | 51 ++++++++++++++++++++++++--------------------------
 1 file changed, 24 insertions(+), 27 deletions(-)

(limited to 'src/cli')

diff --git a/src/cli/encryption.cpp b/src/cli/encryption.cpp
index ffc1d0b48..c041f78ee 100644
--- a/src/cli/encryption.cpp
+++ b/src/cli/encryption.cpp
@@ -9,10 +9,9 @@
 #if defined(BOTAN_HAS_AES) && defined(BOTAN_HAS_AEAD_MODES)
 
 #include <botan/aead.h>
+#include <botan/hex.h>
 #include <sstream>
 
-using namespace Botan;
-
 namespace Botan_CLI {
 
 namespace {
@@ -31,41 +30,39 @@ auto VALID_MODES = std::map<std::string, std::string>{
          { "aes-256-xts", "AES-256/XTS" },
 };
 
-bool is_aead(const std::string &cipher)
-   {
-   return cipher.find("/GCM") != std::string::npos
-          || cipher.find("/OCB") != std::string::npos;
-   }
-
-secure_vector<byte> do_crypt(const std::string &cipher,
-                             const std::vector<byte> &input,
-                             const SymmetricKey &key,
-                             const InitializationVector &iv,
-                             const OctetString &ad,
-                             Cipher_Dir direction)
+Botan::secure_vector<uint8_t>
+do_crypt(const std::string &cipher,
+         const std::vector<uint8_t> &input,
+         const Botan::SymmetricKey &key,
+         const Botan::InitializationVector &iv,
+         const std::vector<uint8_t>& ad,
+         Botan::Cipher_Dir direction)
    {
-   if (iv.size() == 0) throw std::invalid_argument("IV must not be empty");
+   if(iv.size() == 0)
+      throw CLI_Usage_Error("IV must not be empty");
 
    // TODO: implement streaming
 
-   std::shared_ptr<Botan::Cipher_Mode> processor(Botan::get_cipher_mode(cipher, direction));
-   if(!processor) throw std::runtime_error("Cipher algorithm not found");
+   std::unique_ptr<Botan::Cipher_Mode> processor(Botan::get_cipher_mode(cipher, direction));
+   if(!processor)
+      throw CLI_Error("Cipher algorithm not found");
 
    // Set key
    processor->set_key(key);
 
-   // Set associated data
-   if (is_aead(cipher))
+   if(Botan::AEAD_Mode* aead = dynamic_cast<Botan::AEAD_Mode*>(processor.get()))
+      {
+      aead->set_ad(ad);
+      }
+   else if(ad.size() != 0)
       {
-      auto aead_processor = std::dynamic_pointer_cast<AEAD_Mode>(processor);
-      if(!aead_processor) throw std::runtime_error("Cipher algorithm not could not be converted to AEAD");
-      aead_processor->set_ad(ad.bits_of());
+      throw CLI_Usage_Error("Cannot specify associated data with non-AEAD mode");
       }
 
    // Set IV
    processor->start(iv.bits_of());
 
-   secure_vector<byte> buf(input.begin(), input.end());
+   Botan::secure_vector<uint8_t> buf(input.begin(), input.end());
    processor->finish(buf);
 
    return buf;
@@ -103,11 +100,11 @@ class Encryption final : public Command
             error_output() << "Got " << input.size() << " bytes of input data.\n";
             }
 
-         auto key = SymmetricKey(key_hex);
-         auto iv = InitializationVector(iv_hex);
-         auto ad = OctetString(ad_hex);
+         const Botan::SymmetricKey key(key_hex);
+         const Botan::InitializationVector iv(iv_hex);
+         const std::vector<uint8_t> ad = Botan::hex_decode(ad_hex);
 
-         auto direction = flag_set("decrypt") ? Cipher_Dir::DECRYPTION : Cipher_Dir::ENCRYPTION;
+         auto direction = flag_set("decrypt") ? Botan::Cipher_Dir::DECRYPTION : Botan::Cipher_Dir::ENCRYPTION;
          write_output(do_crypt(VALID_MODES[mode], input, key, iv, ad, direction));
          }
    };
-- 
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