Mcrypt库将结果写入文件

Mcrypt库将结果写入文件,c,file,mcrypt,C,File,Mcrypt,我正在尝试将加密数据写入文件。然而,当把它读回程序并试图解密它时,我只会把垃圾拿出来。如果不将其写入文件,它似乎可以工作。。我做错了什么 代码如下: MCRYPT td, td2; char * string = "My secret message"; int i; char *key; /* created using mcrypt_gen_key */ char *IV; char * block_buffer; int blocksize; int keysize = 32; /

我正在尝试将加密数据写入文件。然而,当把它读回程序并试图解密它时,我只会把垃圾拿出来。如果不将其写入文件,它似乎可以工作。。我做错了什么

代码如下:

MCRYPT td, td2;    
char * string = "My secret message";
int i;
char *key; /* created using mcrypt_gen_key */
char *IV;
char * block_buffer;
int blocksize;
int keysize = 32; /* 192 bits == 24 bytes */
key = calloc(1, keysize);
strcpy(key, "This-is-my-key#########");
td = mcrypt_module_open("saferplus", NULL, "cbc", NULL);
td2 = mcrypt_module_open("saferplus", NULL, "cbc", NULL);

blocksize = mcrypt_enc_get_block_size(td);
block_buffer = malloc(blocksize);
IV=malloc(mcrypt_enc_get_iv_size(td));
for (i=0; i < mcrypt_enc_get_iv_size(td); i++) {
IV[i]=rand();
}
mcrypt_generic_init(td, key, keysize, IV);
mcrypt_generic_init(td2, key, keysize, IV);
strcpy(block_buffer, string);

printf("1: %s\n", block_buffer);
mcrypt_generic (td, block_buffer, blocksize);

FILE *myFile;   
myFile = fopen("encrypted","ab");
fwrite(block_buffer, 1, blocksize, myFile);
fclose(myFile);
printf("2: %s\n", block_buffer);

myFile = fopen("encrypted","rb");
fread(block_buffer, 1, blocksize, myFile);
fclose(myFile);

printf("2.5: %s\n", block_buffer);

mdecrypt_generic (td2, block_buffer, blocksize);
printf("3: %s\n", block_buffer);


/* deinitialize the encryption thread */
mcrypt_generic_deinit (td);
mcrypt_generic_deinit(td2);
/* Unload the loaded module */
mcrypt_module_close(td);
mcrypt_module_close(td2);

return 0;
MCRYPT-td,td2;
char*string=“我的秘密消息”;
int i;
字符*键;/*使用mcrypt\u gen\u键创建*/
char*IV;
字符*块缓冲区;
整块大小;
int keysize=32;/*192位==24字节*/
key=calloc(1,keysize);
strcpy(key,“这是我的钥匙”);
td=mcrypt_模块_打开(“saferplus”,NULL,“cbc”,NULL);
td2=mcrypt_模块_打开(“saferplus”,NULL,“cbc”,NULL);
blocksize=mcrypt\u enc\u get\u block\u size(td);
block_buffer=malloc(blocksize);
IV=malloc(mcrypt_enc_get_IV_size(td));
对于(i=0;i
这很有效。我认为您只需要将块缓冲区初始化为零

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <mcrypt.h>

int main()
{
    MCRYPT td, td2;
    char * string = "My secret message";
    int i;
    char *key; /* created using mcrypt_gen_key */
    char *IV;
    char * block_buffer;
    int blocksize;
    int keysize = 32; /* 192 bits == 24 bytes */
    FILE *myFile;

    key = calloc(1, keysize);
    strcpy(key, "This-is-my-key#########");
    td = mcrypt_module_open("saferplus", NULL, "cbc", NULL);
    td2 = mcrypt_module_open("saferplus", NULL, "cbc", NULL);

    blocksize = mcrypt_enc_get_block_size(td);
    block_buffer = calloc(1, blocksize); /* Fixed issue here */
    IV = malloc(mcrypt_enc_get_iv_size(td));
    if ((block_buffer == NULL) || (IV == NULL)) {
            fprintf(stderr, "Failed to allocate memory\n");
            exit(EXIT_FAILURE);
    }
    for (i = 0; i < mcrypt_enc_get_iv_size(td); i++) {
            IV[i] = rand();
    }
    mcrypt_generic_init(td, key, keysize, IV);
    mcrypt_generic_init(td2, key, keysize, IV);
    strcpy(block_buffer, string);

    printf("1: %s\n", block_buffer);
    mcrypt_generic (td, block_buffer, blocksize);

    myFile = fopen("encrypted","w");
    if ((myFile == NULL) || (fwrite(block_buffer, blocksize, 1, myFile) != 1)) {
            fprintf(stderr, "Failed to write data\n");
            exit(EXIT_FAILURE);
    }
    fclose(myFile);
    printf("2: %s\n", block_buffer);

    myFile = fopen("encrypted","r");
    if ((myFile == NULL) || (fread(block_buffer, blocksize, 1, myFile) != 1)) {
            fprintf(stderr, "Failed to read data\n");
            exit(EXIT_FAILURE);
    }
    fclose(myFile);

    printf("2.5: %s\n", block_buffer);

    mdecrypt_generic (td2, block_buffer, blocksize);
    printf("3: %s\n", block_buffer);

    /* deinitialize the encryption thread */
    mcrypt_generic_deinit (td);
    mcrypt_generic_deinit(td2);
    /* Unload the loaded module */
    mcrypt_module_close(td);
    mcrypt_module_close(td2);

    return 0;
}
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int main()
{
MCRYPT-td,td2;
char*string=“我的秘密消息”;
int i;
char*key;/*使用mcrypt\u gen\u key创建*/
char*IV;
字符*块缓冲区;
整块大小;
int keysize=32;/*192位==24字节*/
文件*myFile;
key=calloc(1,keysize);
strcpy(key,“这是我的钥匙”);
td=mcrypt_模块_打开(“saferplus”,NULL,“cbc”,NULL);
td2=mcrypt_模块_打开(“saferplus”,NULL,“cbc”,NULL);
blocksize=mcrypt\u enc\u get\u block\u size(td);
block_buffer=calloc(1,blocksize);/*修复了此处的问题*/
IV=malloc(mcrypt_enc_get_IV_size(td));
if((块缓冲区==NULL)| |(IV==NULL)){
fprintf(stderr,“分配内存失败\n”);
退出(退出失败);
}
对于(i=0;i
为什么要打开文件进行附加(
myFile=fopen(“加密”、“ab”);
)而不是简单的书写?运行程序时文件是否已经存在?你有没有把加密的的hextdump与内存缓冲区进行过比较?谢谢你,我第一次打开它是用一个。我想可能是因为格式化的缘故,一些信息丢失了,所以我想试着用二进制文件保存并打开它,看看它是否会有所不同。我该怎么做呢?一个到教程的链接就足够了。。