1 files changed, 92 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/pk_pad/emsa_raw/emsa_raw.cpp b/comm/third_party/botan/src/lib/pk_pad/emsa_raw/emsa_raw.cpp
new file mode 100644
index 0000000000..0ac11dc5ad
--- /dev/null
+++ b/comm/third_party/botan/src/lib/pk_pad/emsa_raw/emsa_raw.cpp
@@ -0,0 +1,92 @@
+/*
+* EMSA-Raw
+* (C) 1999-2007 Jack Lloyd
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#include <botan/emsa_raw.h>
+#include <botan/exceptn.h>
+
+namespace Botan {
+
+std::string EMSA_Raw::name() const
+   {
+   if(m_expected_size > 0)
+      return "Raw(" + std::to_string(m_expected_size) + ")";
+   return "Raw";
+   }
+
+/*
+* EMSA-Raw Encode Operation
+*/
+void EMSA_Raw::update(const uint8_t input[], size_t length)
+   {
+   m_message += std::make_pair(input, length);
+   }
+
+/*
+* Return the raw (unencoded) data
+*/
+secure_vector<uint8_t> EMSA_Raw::raw_data()
+   {
+   if(m_expected_size && m_message.size() != m_expected_size)
+      throw Invalid_Argument("EMSA_Raw was configured to use a " +
+                             std::to_string(m_expected_size) +
+                             " byte hash but instead was used for a " +
+                             std::to_string(m_message.size()) + " hash");
+
+   secure_vector<uint8_t> output;
+   std::swap(m_message, output);
+   return output;
+   }
+
+/*
+* EMSA-Raw Encode Operation
+*/
+secure_vector<uint8_t>
+EMSA_Raw::encoding_of(const secure_vector<uint8_t>& msg,
+                      size_t,
+                      RandomNumberGenerator&)
+   {
+   if(m_expected_size && msg.size() != m_expected_size)
+      throw Invalid_Argument("EMSA_Raw was configured to use a " +
+                             std::to_string(m_expected_size) +
+                             " byte hash but instead was used for a " +
+                             std::to_string(msg.size()) + " hash");
+
+   return msg;
+   }
+
+/*
+* EMSA-Raw Verify Operation
+*/
+bool EMSA_Raw::verify(const secure_vector<uint8_t>& coded,
+                      const secure_vector<uint8_t>& raw,
+                      size_t)
+   {
+   if(m_expected_size && raw.size() != m_expected_size)
+      return false;
+
+   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(!constant_time_compare(coded.data(), raw.data() + leading_zeros_expected, coded.size()))
+      same_modulo_leading_zeros = false;
+
+   return same_modulo_leading_zeros;
+   }
+
+}