OpenSSL 1.1.1-pre2

crypto/ec/curve448/arch_32/f_impl.h

@@ -0,0 +1,60 @@
+/*
+ * Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 2014-2016 Cryptography Research, Inc.
+ *
+ * Licensed under the OpenSSL license (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ *
+ * Originally written by Mike Hamburg
+ */
+
+#ifndef HEADER_ARCH_32_F_IMPL_H
+# define HEADER_ARCH_32_F_IMPL_H
+
+# define GF_HEADROOM 2
+# define LIMB(x) ((x) & ((1 << 28) - 1)), ((x) >> 28)
+# define FIELD_LITERAL(a, b, c, d, e, f, g, h) \
+    {{LIMB(a), LIMB(b), LIMB(c), LIMB(d), LIMB(e), LIMB(f), LIMB(g), LIMB(h)}}
+
+# define LIMB_PLACE_VALUE(i) 28
+
+void gf_add_RAW(gf out, const gf a, const gf b)
+{
+    unsigned int i;
+
+    for (i = 0; i < NLIMBS; i++)
+        out->limb[i] = a->limb[i] + b->limb[i];
+}
+
+void gf_sub_RAW(gf out, const gf a, const gf b)
+{
+    unsigned int i;
+
+    for (i = 0; i < NLIMBS; i++)
+        out->limb[i] = a->limb[i] - b->limb[i];
+}
+
+void gf_bias(gf a, int amt)
+{
+    unsigned int i;
+    uint32_t co1 = ((1 << 28) - 1) * amt, co2 = co1 - amt;
+
+    for (i = 0; i < NLIMBS; i++)
+        a->limb[i] += (i == NLIMBS / 2) ? co2 : co1;
+}
+
+void gf_weak_reduce(gf a)
+{
+    uint32_t mask = (1 << 28) - 1;
+    uint32_t tmp = a->limb[NLIMBS - 1] >> 28;
+    unsigned int i;
+
+    a->limb[NLIMBS / 2] += tmp;
+    for (i = NLIMBS - 1; i > 0; i--)
+        a->limb[i] = (a->limb[i] & mask) + (a->limb[i - 1] >> 28);
+    a->limb[0] = (a->limb[0] & mask) + tmp;
+}
+
+#endif                  /* HEADER_ARCH_32_F_IMPL_H */