C语言计算文件的md5值

C语言计算文件的md5值（长度32）如果开发者对于本文件有需要的可以参考。


Compute md5 value of file or string.
Try the following:
$ gcc main_md5.c md5.c -Wall -o md5_test
$ ./md5_test
// you may get following:
[file - md5.c] md5 value:

2a2caf52cb298f177a57a3211213e141

[string - gchinaran@gmail.com] md5 value:

84701974fb98315895e3ed9053a0b389
// and you can check by md5sum
$ md5sum md5.c
2a2caf52cb298f177a57a3211213e141 md5.c
// Last: 16-digit md5 is the middle of 32-digit md5