1 files changed, 68 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/hash/keccak/keccak.cpp b/comm/third_party/botan/src/lib/hash/keccak/keccak.cpp
new file mode 100644
index 0000000000..b8196495c6
--- /dev/null
+++ b/comm/third_party/botan/src/lib/hash/keccak/keccak.cpp
@@ -0,0 +1,68 @@
+/*
+* Keccak
+* (C) 2010,2016 Jack Lloyd
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#include <botan/keccak.h>
+#include <botan/sha3.h>
+#include <botan/exceptn.h>
+#include <botan/loadstor.h>
+
+namespace Botan {
+
+std::unique_ptr<HashFunction> Keccak_1600::copy_state() const
+   {
+   return std::unique_ptr<HashFunction>(new Keccak_1600(*this));
+   }
+
+Keccak_1600::Keccak_1600(size_t output_bits) :
+   m_output_bits(output_bits),
+   m_bitrate(1600 - 2*output_bits),
+   m_S(25),
+   m_S_pos(0)
+   {
+   // We only support the parameters for the SHA-3 proposal
+
+   if(output_bits != 224 && output_bits != 256 &&
+      output_bits != 384 && output_bits != 512)
+      throw Invalid_Argument("Keccak_1600: Invalid output length " +
+                             std::to_string(output_bits));
+   }
+
+std::string Keccak_1600::name() const
+   {
+   return "Keccak-1600(" + std::to_string(m_output_bits) + ")";
+   }
+
+HashFunction* Keccak_1600::clone() const
+   {
+   return new Keccak_1600(m_output_bits);
+   }
+
+void Keccak_1600::clear()
+   {
+   zeroise(m_S);
+   m_S_pos = 0;
+   }
+
+void Keccak_1600::add_data(const uint8_t input[], size_t length)
+   {
+   m_S_pos = SHA_3::absorb(m_bitrate, m_S, m_S_pos, input, length);
+   }
+
+void Keccak_1600::final_result(uint8_t output[])
+   {
+   SHA_3::finish(m_bitrate, m_S, m_S_pos, 0x01, 0x80);
+
+   /*
+   * We never have to run the permutation again because we only support
+   * limited output lengths
+   */
+   copy_out_vec_le(output, m_output_bits/8, m_S);
+
+   clear();
+   }
+
+}