Shell脚本嵌入到二进制代码中

~$ openssl enc -pass pass:123 -e -aes-256-cbc -in test.txt -out test.txt.enc
~$ openssl enc -pass pass:123 -d -aes-256-cbc -in test.txt.enc -out test.txt.new
### We can get more notice with wrong option. e.g.: --help, --xxx
~$ openssl enc --help
unknown option '--help'
options are
-in <file>     input file
-out <file>    output file
-pass <arg>    pass phrase source
-e             encrypt
-d             decrypt
-a/-base64     base64 encode/decode, depending on encryption flag
-k             passphrase is the next argument
-kfile         passphrase is the first line of the file argument
-md            the next argument is the md to use to create a key
                 from a passphrase.  One of md2, md5, sha or sha1
-S             salt in hex is the next argument
-K/-iv         key/iv in hex is the next argument
-[pP]          print the iv/key (then exit if -P)
-bufsize <n>   buffer size
-nopad         disable standard block padding
-engine e      use engine e, possibly a hardware device.
Cipher Types
-aes-128-cbc               -aes-128-cbc-hmac-sha1     -aes-128-cfb
-aes-128-cfb1              -aes-128-cfb8              -aes-128-ctr
-aes-128-ecb               -aes-128-gcm               -aes-128-ofb
-aes-128-xts               -aes-192-cbc               -aes-192-cfb
... ...

~$ objcopy -I binary -O elf64-x86-64 -B i386 file.in file.o
~$ readelf -s test.o

Symbol table '.symtab' contains 5 entries:
   Num:    Value          Size Type    Bind   Vis      Ndx Name
     0: 0000000000000000     0 NOTYPE  LOCAL  DEFAULT  UND
     1: 0000000000000000     0 SECTION LOCAL  DEFAULT    1
     2: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT    1 _binary_test_in_start
     3: 0000000000000205     0 NOTYPE  GLOBAL DEFAULT    1 _binary_test_in_end
     4: 0000000000000205     0 NOTYPE  GLOBAL DEFAULT  ABS _binary_test_in_size
#### => We need to define extern char variable with above name
~$ cat eg.c
extern const char _binary_test_in_start;
extern const char _binary_test_in_end;
// #### => The data is positioned bewteen above symbol
... ...
copy_region_to_data(&_binary_test_in_start, &_binary_test_in_end, "test.data");
// #### => DATA RANGE: [&_binary_test_in_start, &_binary_test_in_end)

~$ strip --strip-all test