1 files changed, 39 insertions, 0 deletions
diff --git a/plugin/auth_ed25519/ref10/sign.c b/plugin/auth_ed25519/ref10/sign.c
new file mode 100644
index 00000000..0cf1edd1
--- /dev/null
+++ b/plugin/auth_ed25519/ref10/sign.c
@@ -0,0 +1,39 @@
+#include <string.h>
+#include "crypto_sign.h"
+#include "crypto_hash_sha512.h"
+#include "ge.h"
+#include "sc.h"
+
+int crypto_sign(
+  unsigned char *sm,
+  const unsigned char *m,unsigned long long mlen,
+  const unsigned char *pw,unsigned long long pwlen
+)
+{
+  unsigned char az[64];
+  unsigned char nonce[64];
+  unsigned char hram[64];
+  ge_p3 A, R;
+
+  crypto_hash_sha512(az,pw,pwlen);
+  az[0] &= 248;
+  az[31] &= 63;
+  az[31] |= 64;
+
+  memmove(sm + 64,m,mlen);
+  memmove(sm + 32,az + 32,32);
+  crypto_hash_sha512(nonce,sm + 32,mlen + 32);
+
+  ge_scalarmult_base(&A,az);
+  ge_p3_tobytes(sm + 32,&A);
+
+  sc_reduce(nonce);
+  ge_scalarmult_base(&R,nonce);
+  ge_p3_tobytes(sm,&R);
+
+  crypto_hash_sha512(hram,sm,mlen + 64);
+  sc_reduce(hram);
+  sc_muladd(sm + 32,hram,az,nonce);
+
+  return 0;
+}