Linux Kernel(Android) 加密算法总结（三）-应用程序调用内核加密算法接口

讲到了怎样调用内核中的接口的方法。

本节主要是介绍怎样Android C/C++应用程序调用Openssl的AES加密算法。

crypt_ssl.c

#include <stdio.h>

#include <string.h>

#include <unistd.h>

#include <fcntl.h>

#include <aes.h>

#include <sys/socket.h>

#include <linux/if_alg.h>

#include <evp.h>

#include <stdio.h>

#include <stdlib.h>

#ifndef AF_ALG

    #define AF_ALG 38

    #define SOL_ALG 279

#endif

#define BUF_SIZE 16

static void crypt_ssl(char *in, int inlen, char *out,const char *key, char *iv)

{

    AES_KEY akey;

    AES_set_encrypt_key(key, 128, &akey);

    AES_cbc_encrypt(in, out, inlen, &akey, iv, 1);

}

int main(int argc, char **argv)

{

    int i;

    char out[BUF_SIZE] = {0};

    char in[BUF_SIZE] = "Single block msg";

    const char key[16] =

    "x06xa9x21x40x36xb8xa1x5b"

    "x51x2ex03xd5x34x12x00x06";

    char iv[16] =

    "x3dxafxbax42x9dx9exb4x30"

    "xb4x22xdax80x2cx9fxacx41";

    if(argc != 2)

    {

        printf("usage:compare openssl / compare kernel \n");

    }

    if(strncmp(argv[1], "openssl", 7) == 0)

    {

        printf("encrypt by openssl...n");

        crypt_ssl(in, BUF_SIZE, out, key, iv);

    }

    for (i = 0; i < BUF_SIZE; i )

        printf("0x", (unsigned char)out[i]);

    printf("n");

    return 0;

} 

在Android 源码编译文件：

Android.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE := myencrypt

LOCAL_MODULE_TAGS := optional

LOCAL_SRC_FILES := \

    crypt_ssl.c

LOCAL_SHARED_LIBRARIES := \

    libdl  \

    liblog \

    libcrypto

LOCAL_C_INCLUDES := \

    external/openssl/include/openssl \

    external/openssl/include

include $(BUILD_EXECUTABLE)

编译完毕后在

adb push testhash /system/bin/

adb shell chmod a+x /system/bin/testhash

adb shell testhash

验证输出结果.