sdk 使用so 加密密钥，防止反编译

jni/Android.mk

+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := sobot
+
+LOCAL_SRC_FILES := sobot.c \ md5.c
+
+include $(BUILD_SHARED_LIBRARY)

jni/Application.mk

+#all 支持所有平台
+APP_ABI:=all
+APP_STL := c++_static
+
+#如果控制台报了一个说APP_PLATFORM版本高于AndroidManifest.xml中的minSdkVersion，那你就在Application.mk中添加类似如图的语句即可
+APP_PLATFORM := android-16
+APP_ALLOW_MISSING_DEPS=true

jni/com_sobot_chat_utils_SobotUtil.h

+/* DO NOT EDIT THIS FILE - it is machine generated */
+#include <jni.h>
+/* Header for class com_sobot_chat_utils_SobotUtil */
+
+#ifndef _Included_com_sobot_chat_utils_SobotUtil
+#define _Included_com_sobot_chat_utils_SobotUtil
+#ifdef __cplusplus
+extern "C" {
+#endif
+/*
+ * Class:     com_sobot_chat_utils_SobotUtil
+ * Method:    getSign
+ * Signature: (Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
+ */
+JNIEXPORT jstring JNICALL Java_com_sobot_chat_utils_SobotUtil_getSign
+  (JNIEnv *, jclass, jstring, jstring, jstring, jstring, jstring);
+
+#ifdef __cplusplus
+}
+#endif
+#endif

jni/md5.c

+/* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
+ */
+
+/* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
+rights reserved.
+
+License to copy and use this software is granted provided that it
+is identified as the "RSA Data Security, Inc. MD5 Message-Digest
+Algorithm" in all material mentioning or referencing this software
+or this function.
+
+License is also granted to make and use derivative works provided
+that such works are identified as "derived from the RSA Data
+Security, Inc. MD5 Message-Digest Algorithm" in all material
+mentioning or referencing the derived work.
+
+RSA Data Security, Inc. makes no representations concerning either
+the merchantability of this software or the suitability of this
+software for any particular purpose. It is provided "as is"
+without express or implied warranty of any kind.
+
+These notices must be retained in any copies of any part of this
+documentation and/or software.
+ */
+#include "md5.h"
+
+
+/* Constants for MD5Transform routine.
+ */
+
+#define S11 7
+#define S12 12
+#define S13 17
+#define S14 22
+#define S21 5
+#define S22 9
+#define S23 14
+#define S24 20
+#define S31 4
+#define S32 11
+#define S33 16
+#define S34 23
+#define S41 6
+#define S42 10
+#define S43 15
+#define S44 21
+
+static unsigned char PADDING[64] = {
+  0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+};
+
+/* F, G, H and I are basic MD5 functions.
+ */
+#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
+#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
+#define H(x, y, z) ((x) ^ (y) ^ (z))
+#define I(x, y, z) ((y) ^ ((x) | (~z)))
+
+/* ROTATE_LEFT rotates x left n bits.
+ */
+#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
+
+/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
+Rotation is separate from addition to prevent recomputation.
+ */
+#define FF(a, b, c, d, x, s, ac) { \
+ (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
+ (a) = ROTATE_LEFT ((a), (s)); \
+ (a) += (b); \
+  }
+#define GG(a, b, c, d, x, s, ac) { \
+ (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
+ (a) = ROTATE_LEFT ((a), (s)); \
+ (a) += (b); \
+  }
+#define HH(a, b, c, d, x, s, ac) { \
+ (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
+ (a) = ROTATE_LEFT ((a), (s)); \
+ (a) += (b); \
+  }
+#define II(a, b, c, d, x, s, ac) { \
+ (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
+ (a) = ROTATE_LEFT ((a), (s)); \
+ (a) += (b); \
+  }
+
+/* MD5 initialization. Begins an MD5 operation, writing a new context.
+ */
+void MD5Init (MD5_CTX *context)
+{
+  context->count[0] = context->count[1] = 0;
+  /* Load magic initialization constants.
+*/
+  context->state[0] = 0x67452301;
+  context->state[1] = 0xefcdab89;
+  context->state[2] = 0x98badcfe;
+  context->state[3] = 0x10325476;
+}
+
+/* MD5 block update operation. Continues an MD5 message-digest
+  operation, processing another message block, and updating the
+  context.
+ */
+void MD5Update (MD5_CTX *context,unsigned char *input,unsigned int inputLen)
+{
+  unsigned int i, index, partLen;
+
+  /* Compute number of bytes mod 64 */
+  index = (unsigned int)((context->count[0] >> 3) & 0x3F);
+
+  /* Update number of bits */
+  if ((context->count[0] += ((UINT4)inputLen << 3))
+   < ((UINT4)inputLen << 3))
+ context->count[1]++;
+  context->count[1] += ((UINT4)inputLen >> 29);
+
+  partLen = 64 - index;
+
+  /* Transform as many times as possible.
+*/
+  if (inputLen >= partLen) {
+ MD5_memcpy
+   ((POINTER)&context->buffer[index], (POINTER)input, partLen);
+ MD5Transform (context->state, context->buffer);
+
+ for (i = partLen; i + 63 < inputLen; i += 64)
+   MD5Transform (context->state, &input[i]);
+
+ index = 0;
+  }
+  else
+ i = 0;
+
+  /* Buffer remaining input */
+  MD5_memcpy
+ ((POINTER)&context->buffer[index], (POINTER)&input[i],
+  inputLen-i);
+}
+
+/* MD5 finalization. Ends an MD5 message-digest operation, writing the
+  the message digest and zeroizing the context.
+ */
+void MD5Final (unsigned char digest[16], MD5_CTX *context)
+{
+  unsigned char bits[8];
+  unsigned int index, padLen;
+
+  /* Save number of bits */
+  Encode (bits, context->count, 8);
+
+  /* Pad out to 56 mod 64.
+*/
+  index = (unsigned int)((context->count[0] >> 3) & 0x3f);
+  padLen = (index < 56) ? (56 - index) : (120 - index);
+  MD5Update (context, PADDING, padLen);
+
+  /* Append length (before padding) */
+  MD5Update (context, bits, 8);
+
+  /* Store state in digest */
+  Encode (digest, context->state, 16);
+
+  /* Zeroize sensitive information.
+*/
+  MD5_memset ((POINTER)context, 0, sizeof (*context));
+}
+
+/* MD5 basic transformation. Transforms state based on block.
+ */
+static void MD5Transform (UINT4 state[4], unsigned char block[64])
+{
+  UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
+
+  Decode (x, block, 64);
+
+  /* Round 1 */
+  FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
+  FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
+  FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
+  FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
+  FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
+  FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
+  FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
+  FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
+  FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
+  FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
+  FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
+  FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
+  FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
+  FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
+  FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
+  FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
+
+ /* Round 2 */
+  GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
+  GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
+  GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
+  GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
+  GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
+  GG (d, a, b, c, x[10], S22,  0x2441453); /* 22 */
+  GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
+  GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
+  GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
+  GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
+  GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
+  GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
+  GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
+  GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
+  GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
+  GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
+
+  /* Round 3 */
+  HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
+  HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
+  HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
+  HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
+  HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
+  HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
+  HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
+  HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
+  HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
+  HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
+  HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
+  HH (b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */
+  HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
+  HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
+  HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
+  HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
+
+  /* Round 4 */
+  II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
+  II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
+  II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
+  II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
+  II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
+  II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
+  II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
+  II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
+  II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
+  II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
+  II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
+  II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
+  II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
+  II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
+  II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
+  II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
+
+  state[0] += a;
+  state[1] += b;
+  state[2] += c;
+  state[3] += d;
+
+  /* Zeroize sensitive information.
+   */
+  MD5_memset ((POINTER)x, 0, sizeof (x));
+}
+
+/* Encodes input (UINT4) into output (unsigned char). Assumes len is
+  a multiple of 4.
+ */
+static void Encode (unsigned char *output, UINT4 *input, unsigned int len)
+{
+  unsigned int i, j;
+
+  for (i = 0, j = 0; j < len; i++, j += 4) {
+ output[j] = (unsigned char)(input[i] & 0xff);
+ output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
+ output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
+ output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
+  }
+}
+
+/* Decodes input (unsigned char) into output (UINT4). Assumes len is
+  a multiple of 4.
+ */
+static void Decode (UINT4 *output, unsigned char *input, unsigned int len)
+{
+  unsigned int i, j;
+
+  for (i = 0, j = 0; j < len; i++, j += 4)
+ output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
+   (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
+}
+
+/* Note: Replace "for loop" with standard memcpy if possible.
+ */
+
+static void MD5_memcpy (POINTER output, POINTER input, unsigned int len)
+{
+  unsigned int i;
+
+  for (i = 0; i < len; i++)
+    output[i] = input[i];
+}
+
+/* Note: Replace "for loop" with standard memset if possible.
+ */
+static void MD5_memset (POINTER output, int value, unsigned int len)
+{
+  unsigned int i;
+
+  for (i = 0; i < len; i++)
+ ((char *)output)[i] = (char)value;
+}

jni/md5.h

+/* MD5.H - header file for MD5C.C
+ */
+
+/* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
+rights reserved.
+
+License to copy and use this software is granted provided that it
+is identified as the "RSA Data Security, Inc. MD5 Message-Digest
+Algorithm" in all material mentioning or referencing this software
+or this function.
+
+License is also granted to make and use derivative works provided
+that such works are identified as "derived from the RSA Data
+Security, Inc. MD5 Message-Digest Algorithm" in all material
+mentioning or referencing the derived work.
+
+RSA Data Security, Inc. makes no representations concerning either
+the merchantability of this software or the suitability of this
+software for any particular purpose. It is provided "as is"
+without express or implied warranty of any kind.
+
+These notices must be retained in any copies of any part of this
+documentation and/or software.
+ */
+
+#include <stdint.h>
+
+/* POINTER defines a generic pointer type */
+typedef unsigned char *POINTER;
+
+/* UINT2 defines a two byte word */
+//typedef unsigned short int UINT2;
+typedef uint16_t UINT2;
+
+/* UINT4 defines a four byte word */
+//typedef unsigned int UINT4;
+typedef uint32_t UINT4;
+
+
+/* PROTO_LIST is defined depending on how PROTOTYPES is defined above.
+If using PROTOTYPES, then PROTO_LIST returns the list, otherwise it
+  returns an empty list.
+ */
+
+/* MD5 context. */
+typedef struct tagMD5_CTX{
+  UINT4 state[4];                                   /* state (ABCD) */
+  UINT4 count[2];        /* number of bits, modulo 2^64 (lsb first) */
+  unsigned char buffer[64];                         /* input buffer */
+} MD5_CTX;
+#ifdef __cplusplus
+extern "C" {
+#endif
+void MD5Init (MD5_CTX *context);
+void MD5Update (MD5_CTX *context,unsigned char *input,unsigned int inputLen);
+void MD5Final (unsigned char digest[16], MD5_CTX *context);
+
+static void MD5Transform (UINT4 state[4], unsigned char block[64]);
+static void Encode (unsigned char *output, UINT4 *input, unsigned int len);
+static void Decode (UINT4 *output, unsigned char *input, unsigned int len);
+static void MD5_memcpy (POINTER output, POINTER input, unsigned int len);
+static void MD5_memset (POINTER output, int value, unsigned int len);
+
+#ifdef __cplusplus
+}
+#endif

jni/sobot.c

+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <com_sobot_chat_utils_SobotUtil.h>
+#include <md5.h>
+
+const char *KEY = "sobot*&^%$#@!";
+
+char *jstringToChar(JNIEnv *env, jstring jstr) {
+    char *rtn = NULL;
+    jclass clsstring = (*env)->FindClass(env, "java/lang/String");
+    jstring strencode = (*env)->NewStringUTF(env, "utf-8");
+    jmethodID mid = (*env)->GetMethodID(env, clsstring, "getBytes", "(Ljava/lang/String;)[B");
+    jbyteArray barr = (jbyteArray) (*env)->CallObjectMethod(env, jstr, mid, strencode);
+    jsize alen = (*env)->GetArrayLength(env, barr);
+    jbyte *ba = (*env)->GetByteArrayElements(env, barr, JNI_FALSE);
+    if (alen > 0) {
+        rtn = (char *) malloc(alen + 1);
+        memcpy(rtn, ba, alen);
+        rtn[alen] = 0;
+    }
+    (*env)->ReleaseByteArrayElements(env, barr, ba, 0);
+    return rtn;
+}
+
+JNIEXPORT jstring JNICALL Java_com_sobot_chat_utils_SobotUtil_getSign
+  (JNIEnv *env, jclass j, jstring a, jstring b, jstring c, jstring d, jstring e){
+    char *aa =jstringToChar(env,a);
+    char *cc =jstringToChar(env,c);
+    char *dd =jstringToChar(env,d);
+    char *result = (char *) malloc(strlen(aa) + strlen(dd)+ strlen(cc)+ strlen(KEY));
+    sprintf(result, "%s%s%s%s", aa,dd,cc,KEY);
+    MD5_CTX context = { 0 };
+    MD5Init(&context);
+    MD5Update(&context, result, strlen(result));
+    unsigned char dest[16] = { 0 };
+    MD5Final(dest, &context);
+    (*env)->ReleaseStringUTFChars(env, c, result);
+
+    int i = 0;
+    char szMd5[33] = { 0 };
+    for (i = 0; i < 16; i++)
+     {
+          sprintf(szMd5, "%s%02x", szMd5, dest[i]);
+     }
+     return (*env)->NewStringUTF(env, szMd5);
+}
+

sdk密钥使用so加密文档.md

+**android Studio 基于NDK加密，防止反编译获取加密key**
+**android Studio 基于NDK加密，防止反编译获取加密key**
+
+一、配置ndk路径（不会请自行百度）
+
+1. 依次点击 File – Settings – Appearance&Behavior – System Settings – Android SDK – SDK Tools ，安装 NDK(版本不能太高，太高不能用,我用的是21.0.06.1113669版本) 和CMAke工具
+2. 在项目中local.properties添加ndk路径，例如：ndk.dir=/Users/edy/Documents/Androidtools/android-sdk-macosx/ndk/21.0.6011959 
+3. 环境变量里添加ndk路径，例如：export NDK_HOME=/Users/edy/Documents/Androidtools/android-sdk-macosx/ndk/21.0.6011959
+export PATH=$PATH:$NDK_HOME 
+
+二、新建SobotUtil类实现native方法
+1. SobotUtil代码
+
+
+public class SobotUtil {
+    static {
+        System.loadLibrary("sobot");
+    }
+
+    public static native String getSign(String a, String b, String c, String d, String e);
+
+}
+
+
+
+2. Build->先clean project，然后再rebuild project 生成class文件，生成的文件和SobotUtil.java挨着
+
+
+3. - 打开命令行输入指令找到上一步的SobotUtil.java目录
+- 在输入指令  javac -h . SobotUtil.java  即SobotUtil的路径，生成.h文件,例如：com_sobot_chat_utils_SobotUtil.h
+
+
+4. 在src/main路径下新建一个名为jni的文件夹，将
+com_sobot_chat_utils_SobotUtil.h
+
+的.h文件拷贝到jni文件夹内，并在jni文件夹内新建一个以.c为后缀的类：sobot.c,名字随意，记住是.c不是.cpp，此类用来写实现的方法
+
+
+5. 在.c里面写入执行加密代码的方法，代码不过多解释，如果有不懂的地方，可以参考：
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <com_sobot_chat_utils_SobotUtil.h>
+#include <md5.h>
+
+const char *KEY = "sobot*&^%$#@!";
+
+char *jstringToChar(JNIEnv *env, jstring jstr) {
+    char *rtn = NULL;
+    jclass clsstring = (*env)->FindClass(env, "java/lang/String");
+    jstring strencode = (*env)->NewStringUTF(env, "utf-8");
+    jmethodID mid = (*env)->GetMethodID(env, clsstring, "getBytes", "(Ljava/lang/String;)[B");
+    jbyteArray barr = (jbyteArray) (*env)->CallObjectMethod(env, jstr, mid, strencode);
+    jsize alen = (*env)->GetArrayLength(env, barr);
+    jbyte *ba = (*env)->GetByteArrayElements(env, barr, JNI_FALSE);
+    if (alen > 0) {
+        rtn = (char *) malloc(alen + 1);
+        memcpy(rtn, ba, alen);
+        rtn[alen] = 0;
+    }
+    (*env)->ReleaseByteArrayElements(env, barr, ba, 0);
+    return rtn;
+}
+
+JNIEXPORT jstring JNICALL Java_com_sobot_chat_utils_SobotUtil_getSign
+  (JNIEnv *env, jclass j, jstring a, jstring b, jstring c, jstring d, jstring e){
+    char *aa =jstringToChar(env,a);
+    char *cc =jstringToChar(env,c);
+    char *dd =jstringToChar(env,d);
+    char *result = (char *) malloc(strlen(aa) + strlen(dd)+ strlen(cc)+ strlen(KEY));
+    sprintf(result, "%s%s%s%s", aa,dd,cc,KEY);
+    MD5_CTX context = { 0 };
+    MD5Init(&context);
+    MD5Update(&context, result, strlen(result));
+    unsigned char dest[16] = { 0 };
+    MD5Final(dest, &context);
+    (*env)->ReleaseStringUTFChars(env, c, result);
+
+    int i = 0;
+    char szMd5[33] = { 0 };
+    for (i = 0; i < 16; i++)
+     {
+          sprintf(szMd5, "%s%02x", szMd5, dest[i]);
+     }
+     return (*env)->NewStringUTF(env, szMd5);
+}
+
+6.jni下创建对应的文件，可参考sdk jni
+Android.mk
+Application.mk
+com_sobot_chat_utils_SobotUtil.h
+md5.c
+md5.h
+sobot.c
+
+6. 打开命令窗口，进入jni文件夹，执行命令 **ndk-build** ，会自动生成一个libs文件夹。里边的 .so 文件供调用
+
+
+三、调用生成的 .so文件
+1. 把so文件复制到module下的libs
+2. build.gradle中andoid下添加
+sourceSets{
+        main(){
+            jniLibs.srcDirs = ['libs']
+        }
+}
+3.写工具类加载sobot.so 库调用对应的native 方法
+public class SobotUtil {
+    static {
+        System.loadLibrary("sobot");
+    }
+
+    public static native String getSign(String a, String b, String c, String d, String e);
+
+}
+