Some cleanups (removed unused files, split i15 code into per-function files).

[BearSSL] / src / int / i15_mulacc.c

diff --git a/src/int/i15_mulacc.c b/src/int/i15_mulacc.c
new file mode 100644 (file)
index 0000000..7bde395
--- /dev/null
+++ b/src/int/i15_mulacc.c
@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2017 Thomas Pornin <pornin@bolet.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining 
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be 
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "inner.h"
+
+/* see inner.h */
+void
+br_i15_mulacc(uint16_t *d, const uint16_t *a, const uint16_t *b)
+{
+       size_t alen, blen, u;
+
+       alen = (a[0] + 15) >> 4;
+       blen = (b[0] + 15) >> 4;
+       d[0] = a[0] + b[0];
+       for (u = 0; u < blen; u ++) {
+               uint32_t f;
+               size_t v;
+               uint32_t cc;
+
+               f = b[1 + u];
+               cc = 0;
+               for (v = 0; v < alen; v ++) {
+                       uint32_t z;
+
+                       z = (uint32_t)d[1 + u + v] + MUL15(f, a[1 + v]) + cc;
+                       cc = z >> 15;
+                       d[1 + u + v] = z & 0x7FFF;
+               }
+               d[1 + u + alen] = cc;
+       }
+}