Add T::provider() to allow user to inquire about implementation used

For block ciphers, stream ciphers, hashes, MACs, and cipher modes.
Cipher_Mode already had it, with a slightly different usage.

2 files changed, 27 insertions, 0 deletions

diff --git a/src/lib/block/aes/aes.cpp b/src/lib/block/aes/aes.cpp
index eb24ce5a3..9483dc0eb 100644
--- a/src/lib/block/aes/aes.cpp
+++ b/src/lib/block/aes/aes.cpp
@@ -416,8 +416,31 @@ void aes_key_schedule(const byte key[], size_t length,
    copy_mem(DK.data(), XDK.data(), DK.size());
    }
 
+const char* aes_provider()
+   {
+#if defined(BOTAN_HAS_AES_NI)
+   if(CPUID::has_aes_ni())
+      {
+      return "aesni";
+      }
+#endif
+
+#if defined(BOTAN_HAS_AES_SSSE3)
+   if(CPUID::has_ssse3())
+      {
+      return "ssse3";
+      }
+#endif
+
+   return "base";
+   }
+
 }
 
+const char* AES_128::provider() const { return aes_provider(); }
+const char* AES_192::provider() const { return aes_provider(); }
+const char* AES_256::provider() const { return aes_provider(); }
+
 void AES_128::encrypt_n(const byte in[], byte out[], size_t blocks) const
    {
 #if defined(BOTAN_HAS_AES_NI)
diff --git a/src/lib/block/aes/aes.h b/src/lib/block/aes/aes.h
index d6b334d3c..e22e96e00 100644
--- a/src/lib/block/aes/aes.h
+++ b/src/lib/block/aes/aes.h
@@ -23,6 +23,7 @@ class BOTAN_DLL AES_128 final : public Block_Cipher_Fixed_Params<16, 16>
 
       void clear() override;
 
+      const char* provider() const override;
       std::string name() const override { return "AES-128"; }
       BlockCipher* clone() const override { return new AES_128; }
    private:
@@ -55,6 +56,7 @@ class BOTAN_DLL AES_192 final : public Block_Cipher_Fixed_Params<16, 24>
 
       void clear() override;
 
+      const char* provider() const override;
       std::string name() const override { return "AES-192"; }
       BlockCipher* clone() const override { return new AES_192; }
    private:
@@ -87,6 +89,8 @@ class BOTAN_DLL AES_256 final : public Block_Cipher_Fixed_Params<16, 32>
 
       void clear() override;
 
+      const char* provider() const override;
+
       std::string name() const override { return "AES-256"; }
       BlockCipher* clone() const override { return new AES_256; }
    private: