From 9379f0ac97c72d87138fed78ebc8f4ae2703fcec Mon Sep 17 00:00:00 2001
From: laiwei360735 <1655919897@qq.com>
Date: Mon, 20 Mar 2017 17:14:31 +0800
Subject: [PATCH] Create speck.c

a not good speck.c
---
 demos/mycipher/speck.c | 60 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 demos/mycipher/speck.c

diff --git a/demos/mycipher/speck.c b/demos/mycipher/speck.c
new file mode 100644
index 00000000..8b43983e
--- /dev/null
+++ b/demos/mycipher/speck.c
@@ -0,0 +1,60 @@
+#include "speck.h"
+
+#define ROR(x, r) ((x >> r) | (x << ((sizeof(SPECK_TYPE) * 8) - r)))//循环右移
+#define ROL(x, r) ((x << r) | (x >> ((sizeof(SPECK_TYPE) * 8) - r)))//循环左移
+
+#ifdef SPECK_32_64
+#define R(x, y, k) (x = ROR(x, 7), x += y, x ^= k, y = ROL(y, 2), y ^= x)
+#define RR(x, y, k) (y ^= x, y = ROR(y, 2), x ^= k, x -= y, x = ROL(x, 7))
+#else
+#define R(x, y, k) (x = ROR(x, 8), x += y, x ^= k, y = ROL(y, 3), y ^= x)
+#define RR(x, y, k) (y ^= x, y = ROR(y, 3), x ^= k, x -= y, x = ROL(x, 8))
+#endif
+
+void mycipher_set_encrypt_key(mycipher_key_t *key, const unsigned char *user_key)
+{
+	int i;
+	for (i = 0; i < num_word; i++)
+	{
+		if (user_key[i] == '\0')
+			break;
+		key->rk[i] = user_key[i];
+	}
+	int j = 0;
+	for (; i < num_word; i++)
+	{
+		key->rk[i] = user_key[j++];
+	}
+}
+void speck_expand(SPECK_TYPE const K[ SPECK_KEY_LEN], SPECK_TYPE S[ SPECK_ROUNDS])
+{
+	SPECK_TYPE i, b = K[0];
+	SPECK_TYPE a[SPECK_KEY_LEN - 1];
+	for (i = 0; i < (SPECK_KEY_LEN - 1); i++)
+	{
+		a[i] = K[i + 1];
+	}
+	S[0] = b;
+	for (i = 0; i < SPECK_ROUNDS - 1; i++) {
+		R(a[i % (SPECK_KEY_LEN - 1)], b, i);
+		S[i + 1] = b;
+	}
+}
+void speck_encrypt(SPECK_TYPE const pt[ 2], SPECK_TYPE ct[ 2], SPECK_TYPE const K[ SPECK_ROUNDS])
+{
+	SPECK_TYPE i;
+	ct[0] = pt[0]; ct[1] = pt[1];
+	for (i = 0; i < SPECK_ROUNDS; i++){
+		R(ct[1], ct[0], K[i]);
+	}
+}
+
+void speck_decrypt(SPECK_TYPE const ct[ 2], SPECK_TYPE pt[ 2], SPECK_TYPE const K[ SPECK_ROUNDS])
+{
+	SPECK_TYPE i;
+	pt[0] = ct[0]; pt[1] = ct[1];
+
+	for (i = 0; i < SPECK_ROUNDS; i++){
+		RR(pt[1], pt[0], K[(SPECK_ROUNDS - 1) - i]);
+	}
+}