1 files changed, 68 insertions, 0 deletions
diff --git a/src/lib/pk_pad/emsa_raw/emsa_raw.cpp b/src/lib/pk_pad/emsa_raw/emsa_raw.cpp
new file mode 100644
index 000000000..cb0f99e9c
--- /dev/null
+++ b/src/lib/pk_pad/emsa_raw/emsa_raw.cpp
@@ -0,0 +1,68 @@
+/*
+* EMSA-Raw
+* (C) 1999-2007 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/emsa_raw.h>
+
+namespace Botan {
+
+/*
+* EMSA-Raw Encode Operation
+*/
+void EMSA_Raw::update(const byte input[], size_t length)
+   {
+   message += std::make_pair(input, length);
+   }
+
+/*
+* Return the raw (unencoded) data
+*/
+secure_vector<byte> EMSA_Raw::raw_data()
+   {
+   secure_vector<byte> output;
+   std::swap(message, output);
+   return output;
+   }
+
+/*
+* EMSA-Raw Encode Operation
+*/
+secure_vector<byte> EMSA_Raw::encoding_of(const secure_vector<byte>& msg,
+                                         size_t,
+                                         RandomNumberGenerator&)
+   {
+   return msg;
+   }
+
+/*
+* EMSA-Raw Verify Operation
+*/
+bool EMSA_Raw::verify(const secure_vector<byte>& coded,
+                      const secure_vector<byte>& raw,
+                      size_t)
+   {
+   if(coded.size() == raw.size())
+      return (coded == raw);
+
+   if(coded.size() > raw.size())
+      return false;
+
+   // handle zero padding differences
+   const size_t leading_zeros_expected = raw.size() - coded.size();
+
+   bool same_modulo_leading_zeros = true;
+
+   for(size_t i = 0; i != leading_zeros_expected; ++i)
+      if(raw[i])
+         same_modulo_leading_zeros = false;
+
+   if(!same_mem(&coded[0], &raw[leading_zeros_expected], coded.size()))
+      same_modulo_leading_zeros = false;
+
+   return same_modulo_leading_zeros;
+   }
+
+}