compile X25519 C code from Makefile

1 files changed, 71 insertions, 0 deletions

diff --git a/extract-function.sh b/extract-function.sh
new file mode 100755
index 000000000..4056f242c
--- /dev/null
+++ b/extract-function.sh
@@ -0,0 +1,71 @@
+#!/bin/sh
+
+case "$#" in
+  0)
+    funcname=f
+    ;;
+  1)
+    funcname="$1"
+    ;;
+  *)
+    exit 111
+    ;;
+esac
+
+cat <<EOF
+#include <stdint.h>
+#include <stdbool.h>
+#include <x86intrin.h>
+
+#include "$funcname.h"
+
+typedef unsigned int uint128_t __attribute__((mode(TI)));
+
+#undef force_inline
+#define force_inline __attribute__((always_inline))
+
+EOF
+
+lines=0
+show=false
+while IFS= read -r line; do
+  case "$line" in
+    *"λ '"*)
+      echo -n "void force_inline $funcname("
+      echo -n "uint64_t* out"
+      echo "$line" | grep -owP -- '\w+\d+' | \
+        while IFS= read -r arg; do
+          echo -n ", uint64_t $arg"
+        done
+        echo ')'
+      show=true
+      ;;
+    *"Return "*|*"return "*)
+      i=0
+      echo "$line" | \
+        sed 's:return::g' | sed 's:Return::g' | tr -d '(' | tr -d ')' | tr , '\n' | sed 's/^\s\+//g' | \
+        ( while IFS= read -r ret; do
+            echo "out[$i] = $ret;"
+            ((i++))
+          done;
+          seq 2 "$lines" | while IFS= read -r _; do
+            echo -n "}"
+          done
+          echo "}"
+          echo "// caller: uint64_t out[$i];" )
+      show=false
+      break
+      ;;
+    *)
+      case "$show" in
+        true)
+          ((lines++))
+          echo "{ $line" | \
+            sed s':^\([^,]*\) \([^, ]*\)\(\s*\),\(.*\)\(addcarryx.*\))\([; ]*\)$:\1 \2\3;\4_\5, \&\2)\6:' | \
+            sed s':^\([^,]*\) \([^, ]*\)\(\s*\),\(.*\)\(subborrow.*\))\([; ]*\)$:\1 \2\3;\4_\5, \&\2)\6:'
+          ;;
+      esac
+      ;;
+  esac
+done
+