From f2a84a86e73b77f8f2a22153e1b8b401ae8a8197 Mon Sep 17 00:00:00 2001
From: guowenxue <guowenxue@gmail.com>
Date: Thu, 20 Dec 2018 14:00:01 +0800
Subject: [PATCH] Add ch7_library sample code
---
ch7_library/src/crypto.c | 48 ++++++++++++++++
ch7_library/lib/crypto.h | 28 +++++++++
ch7_library/src/crypto.h | 28 +++++++++
ch7_library/test/main.c | 43 ++++++++++++++
4 files changed, 147 insertions(+), 0 deletions(-)
diff --git a/ch7_library/lib/crypto.h b/ch7_library/lib/crypto.h
new file mode 100644
index 0000000..0aea94f
--- /dev/null
+++ b/ch7_library/lib/crypto.h
@@ -0,0 +1,28 @@
+/********************************************************************************
+ * Copyright: (C) 2018 LingYun IoT System Studio
+ * All rights reserved.
+ *
+ * Filename: crypto.h
+ * Description: This head file is LingYun crypto library head file
+ *
+ * Version: 1.0.0(2018年12月20日)
+ * Author: Guo Wenxue <guowenxue@gmail.com>
+ * ChangeLog: 1, Release initial version on "2018年12月20日 12时32分09秒"
+ *
+ ********************************************************************************/
+
+#ifndef _CRYPTO_H_
+#define _CRYPTO_H_
+
+/* Description: This function used to encrypto message in $plaintext, and put ciphertext into $ciphertext
+ * Return value: 0: Success <0: Failure
+ */
+extern int encrypt(char *plaintext, char *ciphertext, int size);
+
+/* Description: This function used to decrypto message in $ciphertext, and put plaintext into $plaintext
+ * Return value: 0: Success <0: Failure
+ */
+extern int decrypt(char *ciphertext, char *plaintext, int size);
+
+#endif /* ----- #ifndef _CRYPTO_H_ ----- */
+
diff --git a/ch7_library/src/crypto.c b/ch7_library/src/crypto.c
new file mode 100644
index 0000000..1bcc9bc
--- /dev/null
+++ b/ch7_library/src/crypto.c
@@ -0,0 +1,48 @@
+/*********************************************************************************
+ * Copyright: (C) 2018 LingYun IoT System Studio
+ * All rights reserved.
+ *
+ * Filename: crypto.c
+ * Description: This file is LingYun crypto library
+ *
+ * Version: 1.0.0(2018年12月20日)
+ * Author: Guo Wenxue <guowenxue@gmail.com>
+ * ChangeLog: 1, Release initial version on "2018年12月20日 11时56分04秒"
+ *
+ ********************************************************************************/
+#include <string.h>
+
+int encrypt(char *plaintext, char *ciphertext, int size)
+{
+ int i;
+
+ if( size < strlen(plaintext) )
+ {
+ return -1;
+ }
+
+ for(i=0; i<strlen(plaintext); i++)
+ {
+ ciphertext[i] = plaintext[i]+3;
+ }
+
+ return 0;
+}
+
+int decrypt(char *ciphertext, char *plaintext, int size)
+{
+ int i;
+
+ if( size < strlen(ciphertext) )
+ {
+ return -1;
+ }
+
+ for(i=0; i<strlen(ciphertext); i++)
+ {
+ plaintext[i] = ciphertext[i]-3;
+ }
+
+ return 0;
+}
+
diff --git a/ch7_library/src/crypto.h b/ch7_library/src/crypto.h
new file mode 100644
index 0000000..0aea94f
--- /dev/null
+++ b/ch7_library/src/crypto.h
@@ -0,0 +1,28 @@
+/********************************************************************************
+ * Copyright: (C) 2018 LingYun IoT System Studio
+ * All rights reserved.
+ *
+ * Filename: crypto.h
+ * Description: This head file is LingYun crypto library head file
+ *
+ * Version: 1.0.0(2018年12月20日)
+ * Author: Guo Wenxue <guowenxue@gmail.com>
+ * ChangeLog: 1, Release initial version on "2018年12月20日 12时32分09秒"
+ *
+ ********************************************************************************/
+
+#ifndef _CRYPTO_H_
+#define _CRYPTO_H_
+
+/* Description: This function used to encrypto message in $plaintext, and put ciphertext into $ciphertext
+ * Return value: 0: Success <0: Failure
+ */
+extern int encrypt(char *plaintext, char *ciphertext, int size);
+
+/* Description: This function used to decrypto message in $ciphertext, and put plaintext into $plaintext
+ * Return value: 0: Success <0: Failure
+ */
+extern int decrypt(char *ciphertext, char *plaintext, int size);
+
+#endif /* ----- #ifndef _CRYPTO_H_ ----- */
+
diff --git a/ch7_library/test/main.c b/ch7_library/test/main.c
new file mode 100644
index 0000000..4ddc4f1
--- /dev/null
+++ b/ch7_library/test/main.c
@@ -0,0 +1,43 @@
+/*********************************************************************************
+ * Copyright: (C) 2018 LingYun IoT System Studio
+ * All rights reserved.
+ *
+ * Filename: main.c
+ * Description: This file is LingYun Crypto library test program
+ *
+ * Version: 1.0.0(2018年12月20日)
+ * Author: Guo Wenxue <guowenxue@gmail.com>
+ * ChangeLog: 1, Release initial version on "2018年12月20日 12时33分32秒"
+ *
+ ********************************************************************************/
+
+#include <stdio.h>
+#include <string.h>
+#include "crypto.h"
+
+int main(int argc, char *argv[])
+{
+ char *message="abcdefghijklmnopq";
+ char ciphertext[64];
+ char plaintext[64];
+
+ memset(ciphertext, 0, sizeof(ciphertext));
+ if( encrypt(message, ciphertext, sizeof(ciphertext))< 0 )
+ {
+ printf("encrypt plaintext failure\n");
+ return -1;
+ }
+ printf("encrypt ciphertext: %s\n", ciphertext);
+
+
+ memset(plaintext, 0, sizeof(plaintext));
+ if( decrypt(ciphertext, plaintext, sizeof(plaintext))< 0 )
+ {
+ printf("decrypt ciphertext failure\n");
+ return -1;
+ }
+ printf("decrypt plaintext: %s\n", plaintext);
+
+
+ return 0;
+}
--
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