Merge pull request #121 from laiwei360735/patch-2

Create speck.h

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]);
+	}
+}

demos/mycipher/speck.h

@@ -0,0 +1,48 @@
+#ifndef SPECK_H
+#define SPECK_H
+
+/*
+* define speck type to use 
+*(one of SPECK_32_64, SPECK_64_128, SPECK_128_256)
+*/
+#define SPECK_32_64
+
+#ifdef SPECK_32_64
+#define SPECK_TYPE uint16_t
+#define SPECK_ROUNDS 22
+#define SPECK_KEY_LEN 4
+#endif
+
+#ifdef SPECK_64_128
+#define SPECK_TYPE uint32_t
+#define SPECK_ROUNDS 27
+#define SPECK_KEY_LEN 4
+#endif
+
+#ifdef SPECK_128_256
+#define SPECK_TYPE uint64_t
+#define SPECK_ROUNDS 34
+#define SPECK_KEY_LEN 4
+#endif
+
+#define num_word sizeof(SPECK_TYPE)
+#include <sys/types.h>
+#include <stdint.h>
+#include <string.h>
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+	typedef struct {
+		unsigned char rk[num_word];
+	} mycipher_key_t;
+
+	void mycipher_set_encrypt_key(mycipher_key_t *key, const unsigned char *user_key);
+	void speck_expand(SPECK_TYPE const K[SPECK_KEY_LEN], SPECK_TYPE S[SPECK_ROUNDS]);
+	void speck_encrypt(SPECK_TYPE const pt[2], SPECK_TYPE ct[2], SPECK_TYPE const K[SPECK_ROUNDS]);
+	void speck_decrypt(SPECK_TYPE const ct[2], SPECK_TYPE pt[2], SPECK_TYPE const K[SPECK_ROUNDS]);
+
+#ifdef __cplusplus
+}
+#endif
+#endif