Use X64 ASM ed25519 signatures on Linux/x64, which are about 10X faster. Will matter a lot for network controllers, not so much for other things.

ext/ed25519-amd64-asm/sc25519.h

@@ -0,0 +1,66 @@
+#ifndef SC25519_H
+#define SC25519_H
+
+#define sc25519                  crypto_sign_ed25519_amd64_64_sc25519
+#define shortsc25519             crypto_sign_ed25519_amd64_64_shortsc25519
+#define sc25519_from32bytes      crypto_sign_ed25519_amd64_64_sc25519_from32bytes
+#define shortsc25519_from16bytes crypto_sign_ed25519_amd64_64_shortsc25519_from16bytes
+#define sc25519_from64bytes      crypto_sign_ed25519_amd64_64_sc25519_from64bytes
+#define sc25519_from_shortsc     crypto_sign_ed25519_amd64_64_sc25519_from_shortsc
+#define sc25519_to32bytes        crypto_sign_ed25519_amd64_64_sc25519_to32bytes
+#define sc25519_iszero_vartime   crypto_sign_ed25519_amd64_64_sc25519_iszero_vartime
+#define sc25519_isshort_vartime  crypto_sign_ed25519_amd64_64_sc25519_isshort_vartime
+#define sc25519_lt               crypto_sign_ed25519_amd64_64_sc25519_lt
+#define sc25519_add              crypto_sign_ed25519_amd64_64_sc25519_add
+#define sc25519_sub_nored        crypto_sign_ed25519_amd64_64_sc25519_sub_nored
+#define sc25519_mul              crypto_sign_ed25519_amd64_64_sc25519_mul
+#define sc25519_mul_shortsc      crypto_sign_ed25519_amd64_64_sc25519_mul_shortsc
+#define sc25519_window4          crypto_sign_ed25519_amd64_64_sc25519_window4
+#define sc25519_slide          crypto_sign_ed25519_amd64_64_sc25519_slide
+#define sc25519_2interleave2     crypto_sign_ed25519_amd64_64_sc25519_2interleave2
+#define sc25519_barrett crypto_sign_ed25519_amd64_64_sc25519_barrett
+
+typedef struct 
+{
+  unsigned long long v[4]; 
+}
+sc25519;
+
+typedef struct 
+{
+  unsigned long long v[2]; 
+}
+shortsc25519;
+
+void sc25519_from32bytes(sc25519 *r, const unsigned char x[32]);
+
+void sc25519_from64bytes(sc25519 *r, const unsigned char x[64]);
+
+void sc25519_from_shortsc(sc25519 *r, const shortsc25519 *x);
+
+void sc25519_to32bytes(unsigned char r[32], const sc25519 *x);
+
+int sc25519_iszero_vartime(const sc25519 *x);
+
+int sc25519_lt(const sc25519 *x, const sc25519 *y);
+
+void sc25519_add(sc25519 *r, const sc25519 *x, const sc25519 *y);
+
+void sc25519_sub_nored(sc25519 *r, const sc25519 *x, const sc25519 *y);
+
+void sc25519_mul(sc25519 *r, const sc25519 *x, const sc25519 *y);
+
+void sc25519_mul_shortsc(sc25519 *r, const sc25519 *x, const shortsc25519 *y);
+
+/* Convert s into a representation of the form \sum_{i=0}^{63}r[i]2^(4*i)
+ * with r[i] in {-8,...,7}
+ */
+void sc25519_window4(signed char r[85], const sc25519 *s);
+
+void sc25519_slide(signed char r[256], const sc25519 *s, int swindowsize);
+
+void sc25519_2interleave2(unsigned char r[127], const sc25519 *s1, const sc25519 *s2);
+
+void sc25519_barrett(sc25519 *r, unsigned long long x[8]);
+
+#endif