aboutsummaryrefslogtreecommitdiff
path: root/lib/ed25519/src/sign.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/ed25519/src/sign.c')
-rw-r--r--lib/ed25519/src/sign.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/lib/ed25519/src/sign.c b/lib/ed25519/src/sign.c
new file mode 100644
index 0000000..199a839
--- /dev/null
+++ b/lib/ed25519/src/sign.c
@@ -0,0 +1,31 @@
+#include "ed25519.h"
+#include "sha512.h"
+#include "ge.h"
+#include "sc.h"
+
+
+void ed25519_sign(unsigned char *signature, const unsigned char *message, size_t message_len, const unsigned char *public_key, const unsigned char *private_key) {
+ sha512_context hash;
+ unsigned char hram[64];
+ unsigned char r[64];
+ ge_p3 R;
+
+
+ sha512_init(&hash);
+ sha512_update(&hash, private_key + 32, 32);
+ sha512_update(&hash, message, message_len);
+ sha512_final(&hash, r);
+
+ sc_reduce(r);
+ ge_scalarmult_base(&R, r);
+ ge_p3_tobytes(signature, &R);
+
+ sha512_init(&hash);
+ sha512_update(&hash, signature, 32);
+ sha512_update(&hash, public_key, 32);
+ sha512_update(&hash, message, message_len);
+ sha512_final(&hash, hram);
+
+ sc_reduce(hram);
+ sc_muladd(signature + 32, hram, private_key, r);
+}