1 files changed, 65 insertions, 0 deletions
diff --git a/crypto/ec/curve448/arch_x86_64/f_impl.h b/crypto/ec/curve448/arch_x86_64/f_impl.h
new file mode 100644
index 0000000000..a85044a7f4
--- /dev/null
+++ b/crypto/ec/curve448/arch_x86_64/f_impl.h
@@ -0,0 +1,65 @@
+/* Copyright (c) 2014-2016 Cryptography Research, Inc.
+ * Released under the MIT License.  See LICENSE.txt for license information.
+ */
+
+#define GF_HEADROOM 60
+#define FIELD_LITERAL(a,b,c,d,e,f,g,h) {{a,b,c,d,e,f,g,h}}
+#define LIMB_PLACE_VALUE(i) 56
+
+void gf_add_RAW (gf out, const gf a, const gf b) {
+    for (unsigned int i=0; i<sizeof(*out)/sizeof(uint64xn_t); i++) {
+        ((uint64xn_t*)out)[i] = ((const uint64xn_t*)a)[i] + ((const uint64xn_t*)b)[i];
+    }
+    /*
+    unsigned int i;
+    for (i=0; i<sizeof(*out)/sizeof(out->limb[0]); i++) {
+        out->limb[i] = a->limb[i] + b->limb[i];
+    }
+    */
+}
+
+void gf_sub_RAW (gf out, const gf a, const gf b) {
+    for (unsigned int i=0; i<sizeof(*out)/sizeof(uint64xn_t); i++) {
+        ((uint64xn_t*)out)[i] = ((const uint64xn_t*)a)[i] - ((const uint64xn_t*)b)[i];
+    }
+    /*
+    unsigned int i;
+    for (i=0; i<sizeof(*out)/sizeof(out->limb[0]); i++) {
+        out->limb[i] = a->limb[i] - b->limb[i];
+    }
+    */
+}
+
+void gf_bias (gf a, int amt) {
+    uint64_t co1 = ((1ull<<56)-1)*amt, co2 = co1-amt;
+    
+#if __AVX2__
+    uint64x4_t lo = {co1,co1,co1,co1}, hi = {co2,co1,co1,co1};
+    uint64x4_t *aa = (uint64x4_t*) a;
+    aa[0] += lo;
+    aa[1] += hi;
+#elif __SSE2__
+    uint64x2_t lo = {co1,co1}, hi = {co2,co1};
+    uint64x2_t *aa = (uint64x2_t*) a;
+    aa[0] += lo;
+    aa[1] += lo;
+    aa[2] += hi;
+    aa[3] += lo;
+#else
+    for (unsigned int i=0; i<sizeof(*a)/sizeof(uint64_t); i++) {
+        a->limb[i] += (i==4) ? co2 : co1;
+    }
+#endif
+}
+
+void gf_weak_reduce (gf a) {
+    /* PERF: use pshufb/palignr if anyone cares about speed of this */
+    uint64_t mask = (1ull<<56) - 1;
+    uint64_t tmp = a->limb[7] >> 56;
+    a->limb[4] += tmp;
+    for (unsigned int i=7; i>0; i--) {
+        a->limb[i] = (a->limb[i] & mask) + (a->limb[i-1]>>56);
+    }
+    a->limb[0] = (a->limb[0] & mask) + tmp;
+}
+