Move curve25519 code to third_party/fiat.

This change doesn't actually introduce any Fiat code yet. It sets up the
directory structure to make the diffs in the next change clearer.

Change-Id: I38a21fb36b18a08b0907f9d37b7ef5d7d3137ede
Reviewed-on: https://boringssl-review.googlesource.com/22624
Reviewed-by: David Benjamin <davidben@google.com>

CMakeLists.txt

@@ -338,6 +338,7 @@ add_custom_command(
 add_library(crypto_test_data OBJECT crypto_test_data.cc)
 
 add_subdirectory(crypto)
+add_subdirectory(third_party/fiat)
 add_subdirectory(ssl)
 add_subdirectory(ssl/test)
 add_subdirectory(fipstools)

LICENSE

@@ -6,7 +6,8 @@ Contributors to BoringSSL are required to follow the CLA rules for Chromium:
 https://cla.developers.google.com/clas
 
 Some files from Intel are under yet another license, which is also included
-underneath.
+underneath. Files in third_party/ have their own licenses, as described
+therein.
 
 The OpenSSL toolkit stays under a dual license, i.e. both the conditions of the
 OpenSSL License and the original SSLeay license apply to the toolkit. See below

crypto/CMakeLists.txt

@@ -179,6 +179,7 @@ add_library(
   $<TARGET_OBJECTS:chacha>
   $<TARGET_OBJECTS:poly1305>
   $<TARGET_OBJECTS:curve25519>
+  $<TARGET_OBJECTS:fiat>
   $<TARGET_OBJECTS:buf>
   $<TARGET_OBJECTS:bn_extra>
   $<TARGET_OBJECTS:bio>

crypto/curve25519/CMakeLists.txt

@@ -21,7 +21,6 @@ add_library(
 
   OBJECT
 
-  curve25519.c
   spake25519.c
   x25519-x86_64.c
 

crypto/curve25519/spake25519.c

@@ -22,8 +22,8 @@
 #include <openssl/rand.h>
 #include <openssl/sha.h>
 
-#include "internal.h"
 #include "../internal.h"
+#include "../../third_party/fiat/internal.h"
 
 
 // The following precomputation tables are for the following

crypto/curve25519/spake25519_test.cc

@@ -23,7 +23,7 @@
 #include <gtest/gtest.h>
 
 #include "../internal.h"
-#include "internal.h"
+#include "../../third_party/fiat/internal.h"
 
 
 // TODO(agl): add tests with fixed vectors once SPAKE2 is nailed down.

crypto/curve25519/x25519-x86_64.c

@@ -24,7 +24,7 @@
 #include <string.h>
 
 #include "../internal.h"
-#include "internal.h"
+#include "../../third_party/fiat/internal.h"
 
 
 #if defined(BORINGSSL_X25519_X86_64)

third_party/fiat/CMakeLists.txt

@@ -0,0 +1,9 @@
+include_directories(../../include)
+
+add_library(
+  fiat
+
+  OBJECT
+
+  curve25519.c
+)

third_party/fiat/curve25519.c

@@ -30,7 +30,7 @@
 #include <openssl/sha.h>
 
 #include "internal.h"
-#include "../internal.h"
+#include "../../crypto/internal.h"
 
 
 static const int64_t kBottom25Bits = INT64_C(0x1ffffff);

util/generate_build_files.py

@@ -587,7 +587,8 @@ def ExtractVariablesFromCMakeFile(cmakefile):
 
 def main(platforms):
   cmake = ExtractVariablesFromCMakeFile(os.path.join('src', 'sources.cmake'))
-  crypto_c_files = FindCFiles(os.path.join('src', 'crypto'), NoTestsNorFIPSFragments)
+  crypto_c_files = (FindCFiles(os.path.join('src', 'crypto'), NoTestsNorFIPSFragments) +
+                    FindCFiles(os.path.join('src', 'third_party', 'fiat'), NoTestsNorFIPSFragments))
   fips_fragments = FindCFiles(os.path.join('src', 'crypto', 'fipsmodule'), OnlyFIPSFragments)
   ssl_source_files = FindCFiles(os.path.join('src', 'ssl'), NoTests)
   tool_c_files = FindCFiles(os.path.join('src', 'tool'), NoTests)
@@ -638,8 +639,9 @@ def main(platforms):
           NotSSLHeaderFiles))
 
   ssl_internal_h_files = FindHeaderFiles(os.path.join('src', 'ssl'), NoTests)
-  crypto_internal_h_files = FindHeaderFiles(
-      os.path.join('src', 'crypto'), NoTests)
+  crypto_internal_h_files = (
+      FindHeaderFiles(os.path.join('src', 'crypto'), NoTests) +
+      FindHeaderFiles(os.path.join('src', 'third_party', 'fiat'), NoTests))
 
   files = {
       'crypto': crypto_c_files,