小结

本文记录了使用Linux指令将Hex文件与二进制文件的相互转换。

问题及解决

在很多情况下需要将Hex内容的问题转换成二进制文件，另外的情况是，需要将二进制文件转换成Hex内容的文件。例如：需要进行hex字符串存在文件里进行加解密运算时，需要转换成二进制后存在文件中，再进行运算。

使用以下xdd指令：

[john@localhost ~]$ cat hex.txt   #原始文件
5fc6e719bb7a887e32f0c1fc273121a7cc036bb8d3ffa9499821743235a73391[john@localhost ~]$ xxd -r -p hex.txt hex.bin  #转换成二进制文件[john@localhost ~]$ cat hex.bin #输出二进制文件
_���z�~2���'1!��k����I�!t25�3�[john@localhost ~]$ xxd hex.bin  #hexdump格式输出 
0000000: 5fc6 e719 bb7a 887e 32f0 c1fc 2731 21a7  _....z.~2...'1!.
0000010: cc03 6bb8 d3ff a949 9821 7432 35a7 3391  ..k....I.!t25.3.[john@localhost ~]$ xxd -p hex.bin #从二进制文件转换回简单hex文件
5fc6e719bb7a887e32f0c1fc273121a7cc036bb8d3ffa9499821743235a73391[john@localhost ~]$ 

以下是-p和-r的说明：

-p | -ps | -postscript | -plainoutput in postscript continuous hexdump style. Also known as plain hexdump style.-r | -revertreverse operation: convert (or patch) hexdump into binary.  If not writing to stdout,xxd writes into its output file without truncating it. Use the combination -r -p toread plain hexadecimal dumps without line number information and without a particular  col‐umn layout. Additional Whitespace and line-breaks are allowed anywhere.

参考

Linux, Scripting & programming: Hexdump: Hexdump a binary file and convert it back
Stackoverflow: Transform hexadecimal information to binary using a Linux command