core/cortex-m0/curve25519: Move code to third_party folder

Also, add LICENSE file (some files are under CC0, some are
public domain), and METADATA file.

BRANCH=none
BUG=chromium:884905
TEST=make buildall -j, which also include basic tests.

Change-Id: Ib3a7eb9245a0634c4052064c3e36cbe2ddafbcb9
Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1599761
Reviewed-by: Aseda Aboagye <aaboagye@chromium.org>

8 files changed, 31 insertions, 0 deletions

diff --git a/core/cortex-m0/curve25519 b/core/cortex-m0/curve25519
new file mode 120000
index 0000000000..ee9cb3b4a9
--- /dev/null
+++ b/core/cortex-m0/curve25519
@@ -0,0 +1 @@
+../../third_party/unacl-curve25519/core/cortex-m0/curve25519
\ No newline at end of file
diff --git a/core/cortex-m0/curve25519/cc0_1.0 b/third_party/unacl-curve25519/LICENSE
index 1e9da345c3..d45ad380d2 100644
--- a/core/cortex-m0/curve25519/cc0_1.0
+++ b/third_party/unacl-curve25519/LICENSE
@@ -1,3 +1,8 @@
+=== core/cortex-m0/curve25519/*.S
+
+public domain.
+
+=== core/cortex-m0/curve25519/scalarmult.c
 
 Creative Commons CC0 1.0 Universal
 
diff --git a/third_party/unacl-curve25519/METADATA b/third_party/unacl-curve25519/METADATA
new file mode 100644
index 0000000000..feb93e5586
--- /dev/null
+++ b/third_party/unacl-curve25519/METADATA
@@ -0,0 +1,25 @@
+name: "uNaCl - Curve25519 for ARM Cortex-M0"
+description:
+    "μNaCl – The Networking and Cryptography library for microcontrollers"
+    "Standalone Curve25519 implementation for ARM Cortex-M0, optimized for"
+    "speed. About 3 times faster than compiled code from C."
+
+third_party {
+  url {
+    type: HOMEPAGE
+    value: "https://munacl.cryptojedi.org/curve25519-cortexm0.shtml"
+  }
+  url {
+    type: PACKAGE
+    value: "https://munacl.cryptojedi.org/data/curve25519-cortexm0-20150813.tar.bz2"
+  }
+  version: "20150813"
+  last_upgrade_date { year: 2017 month: 07 day: 20 }
+  license_type: UNENCUMBERED
+  local_modifications:
+    "1. LICENSE file has been created for compliance purposes. "
+    "CC0 1.0 included in original distribution, and added a note about most of "
+    "the code being public domain."
+    "2. Adapted the code for the EC codebase, see git log."
+}
+
diff --git a/core/cortex-m0/curve25519/mpy121666.S b/third_party/unacl-curve25519/core/cortex-m0/curve25519/mpy121666.S
index d2a467459b..d2a467459b 100644
--- a/core/cortex-m0/curve25519/mpy121666.S
+++ b/third_party/unacl-curve25519/core/cortex-m0/curve25519/mpy121666.S
diff --git a/core/cortex-m0/curve25519/mul.S b/third_party/unacl-curve25519/core/cortex-m0/curve25519/mul.S
index 366713a7a3..366713a7a3 100644
--- a/core/cortex-m0/curve25519/mul.S
+++ b/third_party/unacl-curve25519/core/cortex-m0/curve25519/mul.S
diff --git a/core/cortex-m0/curve25519/reduce25519.S b/third_party/unacl-curve25519/core/cortex-m0/curve25519/reduce25519.S
index 9a3c29a0f6..9a3c29a0f6 100644
--- a/core/cortex-m0/curve25519/reduce25519.S
+++ b/third_party/unacl-curve25519/core/cortex-m0/curve25519/reduce25519.S
diff --git a/core/cortex-m0/curve25519/scalarmult.c b/third_party/unacl-curve25519/core/cortex-m0/curve25519/scalarmult.c
index 07e2b144e7..07e2b144e7 100644
--- a/core/cortex-m0/curve25519/scalarmult.c
+++ b/third_party/unacl-curve25519/core/cortex-m0/curve25519/scalarmult.c
diff --git a/core/cortex-m0/curve25519/sqr.S b/third_party/unacl-curve25519/core/cortex-m0/curve25519/sqr.S
index b62121adb7..b62121adb7 100644
--- a/core/cortex-m0/curve25519/sqr.S
+++ b/third_party/unacl-curve25519/core/cortex-m0/curve25519/sqr.S