1 files changed, 29 insertions, 0 deletions
diff --git a/src/ext/ed25519/ref10/sign.c b/src/ext/ed25519/ref10/sign.c
new file mode 100644
index 0000000000..1190a0fc99
--- /dev/null
+++ b/src/ext/ed25519/ref10/sign.c
@@ -0,0 +1,29 @@
+/* (Modified by Tor to generate detached signatures.) */
+#include <string.h>
+#include "crypto_sign.h"
+#include "crypto_hash_sha512.h"
+#include "ge.h"
+#include "sc.h"
+
+int crypto_sign(
+  unsigned char *sig,
+  const unsigned char *m, size_t mlen,
+  const unsigned char *sk,const unsigned char *pk
+)
+{
+  unsigned char nonce[64];
+  unsigned char hram[64];
+  ge_p3 R;
+
+  crypto_hash_sha512_2(nonce, sk+32, 32, m, mlen);
+
+  sc_reduce(nonce);
+  ge_scalarmult_base(&R,nonce);
+  ge_p3_tobytes(sig,&R);
+
+  crypto_hash_sha512_3(hram, sig, 32, pk, 32, m, mlen);
+  sc_reduce(hram);
+  sc_muladd(sig + 32,hram,sk,nonce);
+
+  return 0;
+}