Remove unnecessary Src/ folders

Source/Core/Common/Crypto/bn.cpp

@@ -0,0 +1,123 @@
+// Copyright 2007,2008  Segher Boessenkool  <segher@kernel.crashing.org>
+// Licensed under the terms of the GNU GPL, version 2
+// http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
+
+#include <string.h>
+#include <stdio.h>
+#include "../Common.h"
+#include "tools.h"
+
+/*static void bn_print(char *name, u8 *a, u32 n)
+{
+	u32 i;
+
+	printf("%s = ", name);
+
+	for (i = 0; i < n; i++)
+		printf("%02x", a[i]);
+
+	printf("\n");
+}*/
+
+static void bn_zero(u8 *d, u32 n)
+{
+	memset(d, 0, n);
+}
+
+static void bn_copy(u8 *d, u8 *a, u32 n)
+{
+	memcpy(d, a, n);
+}
+
+int bn_compare(u8 *a, u8 *b, u32 n)
+{
+	u32 i;
+
+	for (i = 0; i < n; i++) {
+		if (a[i] < b[i])
+			return -1;
+		if (a[i] > b[i])
+			return 1;
+	}
+
+	return 0;
+}
+
+void bn_sub_modulus(u8 *a, u8 *N, u32 n)
+{
+	u32 i;
+	u32 dig;
+	u8 c;
+
+	c = 0;
+	for (i = n - 1; i < n; i--) {
+		dig = N[i] + c;
+		c = (a[i] < dig);
+		a[i] -= dig;
+	}
+}
+
+void bn_add(u8 *d, u8 *a, u8 *b, u8 *N, u32 n)
+{
+	u32 i;
+	u32 dig;
+	u8 c;
+
+	c = 0;
+	for (i = n - 1; i < n; i--) {
+		dig = a[i] + b[i] + c;
+		c = (dig >= 0x100);
+		d[i] = dig;
+	}
+
+	if (c)
+		bn_sub_modulus(d, N, n);
+
+	if (bn_compare(d, N, n) >= 0)
+		bn_sub_modulus(d, N, n);
+}
+
+void bn_mul(u8 *d, u8 *a, u8 *b, u8 *N, u32 n)
+{
+	u32 i;
+	u8 mask;
+
+	bn_zero(d, n);
+
+	for (i = 0; i < n; i++)
+		for (mask = 0x80; mask != 0; mask >>= 1) {
+			bn_add(d, d, d, N, n);
+			if ((a[i] & mask) != 0)
+				bn_add(d, d, b, N, n);
+		}
+}
+
+void bn_exp(u8 *d, u8 *a, u8 *N, u32 n, u8 *e, u32 en)
+{
+	u8 t[512];
+	u32 i;
+	u8 mask;
+
+	bn_zero(d, n);
+	d[n-1] = 1;
+	for (i = 0; i < en; i++)
+		for (mask = 0x80; mask != 0; mask >>= 1) {
+			bn_mul(t, d, d, N, n);
+			if ((e[i] & mask) != 0)
+				bn_mul(d, t, a, N, n);
+			else
+				bn_copy(d, t, n);
+		}
+}
+
+// only for prime N -- stupid but lazy, see if I care
+void bn_inv(u8 *d, u8 *a, u8 *N, u32 n)
+{
+	u8 t[512], s[512];
+
+	bn_copy(t, N, n);
+	bn_zero(s, n);
+	s[n-1] = 2;
+	bn_sub_modulus(t, s, n);
+	bn_exp(d, a, N, n, t, n);
+}