libs: libsignal-c: sync with upstream

1 files changed, 14 insertions, 0 deletions

diff --git a/libs/libaxolotl/src/curve25519/ed25519/additions/fe_isreduced.c b/libs/libaxolotl/src/curve25519/ed25519/additions/fe_isreduced.c
new file mode 100644
index 0000000000..6fbb3beccd
--- /dev/null
+++ b/libs/libaxolotl/src/curve25519/ed25519/additions/fe_isreduced.c
@@ -0,0 +1,14 @@
+#include "fe.h"
+#include "crypto_verify_32.h"
+
+int fe_isreduced(const unsigned char* s)
+{
+  fe f;
+  unsigned char strict[32];
+
+  fe_frombytes(f, s);
+  fe_tobytes(strict, f);
+  if (crypto_verify_32(strict, s) != 0)
+    return 0;
+  return 1;
+}