Glib学习（25）数据校验和 Data Checksums

深碍√TFBOYSˉ_ 2021-12-14 15:29 186阅读 0赞

glib源码下载：http://ftp.gnome.org/pub/gnome/sources/glib/  
glib帮助文档：https://developer.gnome.org/glib/

Includes  
\#include <glib.h>  
\#include <glib/gi18n.h>

## 描述 ##

GLib提供了一个通用API，用于计算任意字节序列的校验和（或“摘要”），使用各种散列算法，如MD5，SHA-1和SHA-256。

个人感觉要比openssl的函数容易使用。

## 例子 ##

#include <glib.h>
    #include <glib/gprintf.h>
    #include <glib/gi18n.h>
    #include <gmodule.h>
    int main(int argc, char **argv)
    {
        g_printf ("%s() in\n", __func__);
        g_printf ("MD5 length is %ld\n", g_checksum_type_get_length (G_CHECKSUM_MD5));
        g_printf ("SHA1 length is %ld\n", g_checksum_type_get_length (G_CHECKSUM_SHA1));
        g_printf ("SHA256 length is %ld\n", g_checksum_type_get_length (G_CHECKSUM_SHA256));
        g_printf ("SHA512 length is %ld\n", g_checksum_type_get_length (G_CHECKSUM_SHA512));
        g_printf ("SHA384 length is %ld\n", g_checksum_type_get_length (G_CHECKSUM_SHA384));
    
        const guchar *data = "buffer used to compute the checksum.";
        GChecksum *checksum = g_checksum_new (G_CHECKSUM_MD5);//创建指针
        if (checksum)
        {
            g_checksum_update (checksum, data, strlen (data));//更新数据
            g_printf ("checksum is %s\n", g_checksum_get_string (checksum));//打印md5校验
            g_checksum_free (checksum);//释放指针
        }
        gchar *checksum_str = g_compute_checksum_for_data (G_CHECKSUM_MD5, data, strlen (data));//与上面的方法相同，只是更容易使用
        g_printf ("checksum is %s\n", checksum_str);
        g_free (checksum_str);
        
        GBytes *checksum_bytes = g_bytes_new (data, strlen (data));//g_bytes数据类型
        checksum_str = g_compute_checksum_for_bytes (G_CHECKSUM_MD5, checksum_bytes);//计算md5校验
        g_printf ("checksum is %s\n", checksum_str);
        g_free (checksum_str);
        g_printf ("%s() out\n", __func__);
    }

输出结果

main() in
    MD5 length is 16
    SHA1 length is 20
    SHA256 length is 32
    SHA512 length is 64
    SHA384 length is 48
    checksum is 550a7c1c6451be6abc7ca1ca42a09a7f
    checksum is 550a7c1c6451be6abc7ca1ca42a09a7f
    checksum is 550a7c1c6451be6abc7ca1ca42a09a7f
    main() out