diff --git a/ed25519.dll b/ed25519.dll
index e3e370a..9d9b6fd 100644
Binary files a/ed25519.dll and b/ed25519.dll differ
diff --git a/readme.md b/readme.md
index 8c2cf27..637fe93 100644
--- a/readme.md
+++ b/readme.md
@@ -1,8 +1,8 @@
 Ed25519
 -------
 
-This is a portable implementation of [Ed25519](http://ed25519.cr.yp.to/). All
-code is in the public domain.
+This is a portable implementation of [Ed25519](http://ed25519.cr.yp.to/) based
+on the SUPERCOP "ref10" implementation. All code is in the public domain.
 
 All code is pure ANSI C without any dependencies, except for the random seed
 generation which uses standard OS cryptography APIs. If you wish to be
@@ -35,20 +35,20 @@ API
 Creates a 32 byte random seed in `seed` for key generation. `seed` must be a
 writable 32 byte buffer. Returns 0 on success, and nonzero on failure.
 
-    int ed25519_create_keypair(unsigned char *verify_key, unsigned char *sign_key, const unsigned char *seed);
+    void ed25519_create_keypair(unsigned char *verify_key, unsigned char *sign_key, const unsigned char *seed);
 
 Creates a new key pair from the given seed. `verify_key` must be a writable 32
 byte buffer, `sign_key` must be a writable 64 byte buffer and `seed` must be a
-32 byte buffer.  Returns 0 on success, and nonzero on failure.
+32 byte buffer.
 
-    int ed25519_sign(unsigned char *signature,
+    void ed25519_sign(unsigned char *signature,
                      const unsigned char *message, size_t message_len,
                      const unsigned char *sign_key);
 
 Creates a signature of the given message with `sign_key`. `signature` must be
 a writable 64 byte buffer. `message` must have at least `message_len` bytes to
 be read. `sign_key` must be a 64 byte signing key generated by
-`ed25519_create_keypair`. Returns 0 on success, and nonzero on failure.
+`ed25519_create_keypair`.
 
     int ed25519_verify(const unsigned char *signature,
                        const unsigned char *message, size_t message_len,
diff --git a/src/ed25519.h b/src/ed25519.h
index f987c6f..e4d5fe0 100644
--- a/src/ed25519.h
+++ b/src/ed25519.h
@@ -24,8 +24,8 @@ extern "C" {
 int ED25519_DECLSPEC ed25519_create_seed(unsigned char *seed);
 #endif
 
-int ED25519_DECLSPEC ed25519_create_keypair(unsigned char *verify_key, unsigned char *sign_key, const unsigned char *seed);
-int ED25519_DECLSPEC ed25519_sign(unsigned char *signature, const unsigned char *message, size_t message_len, const unsigned char *sign_key);
+void ED25519_DECLSPEC ed25519_create_keypair(unsigned char *verify_key, unsigned char *sign_key, const unsigned char *seed);
+void ED25519_DECLSPEC ed25519_sign(unsigned char *signature, const unsigned char *message, size_t message_len, const unsigned char *sign_key);
 int ED25519_DECLSPEC ed25519_verify(const unsigned char *signature, const unsigned char *message, size_t message_len, const unsigned char *verify_key);
 
 
diff --git a/src/keypair.c b/src/keypair.c
index b3ed843..abf426b 100644
--- a/src/keypair.c
+++ b/src/keypair.c
@@ -3,7 +3,7 @@
 #include "ge.h"
 
 
-int ed25519_create_keypair(unsigned char *verify_key, unsigned char *sign_key, const unsigned char *seed) {
+void ed25519_create_keypair(unsigned char *verify_key, unsigned char *sign_key, const unsigned char *seed) {
     unsigned char h[64];
     ge_p3 A;
     int i;
@@ -23,6 +23,4 @@ int ed25519_create_keypair(unsigned char *verify_key, unsigned char *sign_key, c
     for (i = 0; i < 32; ++i) {
         sign_key[32 + i] = verify_key[i];
     }
-
-    return 0;
 }
diff --git a/src/sign.c b/src/sign.c
index 502e344..ffd1122 100644
--- a/src/sign.c
+++ b/src/sign.c
@@ -4,7 +4,7 @@
 #include "sc.h"
 
 
-int ed25519_sign(unsigned char *signature, const unsigned char *message, size_t message_len, const unsigned char *sign_key) {
+void ed25519_sign(unsigned char *signature, const unsigned char *message, size_t message_len, const unsigned char *sign_key) {
     unsigned char az[64];
     unsigned char r[64];
     unsigned char hram[64];
@@ -33,6 +33,4 @@ int ed25519_sign(unsigned char *signature, const unsigned char *message, size_t
 
     sc_reduce(hram);
     sc_muladd(signature + 32, hram, az, r);
-    
-    return 0;
 }