How can I convert from hex to base64?

Question

Can anyone recommend a straightforward way/tool to convert hex to base64?

I'm using Linux and OS X.

Answer 1

Use xxd with the -r argument (and possibly the -p argument) to convert from hex to plain binary/octets and base64 to convert the binary/octet form to base64.

For a file:

cat file.dat | xxd -r -p | base64

For a string of hex numbers:

echo "6F0AD0BFEE7D4B478AFED096E03CD80A" | xxd -r -p | base64

Answer 2

Well, it depends on the exact formatting of your data. But you can do it with a simple shell scripts:

 echo "obase=10; ibase=16; `cat in.dat`" | bc | base64 > out.dat

Modify as needed depending on your data.

Answer 3

Well, if your hex data is the hex view of a file, just attach the file to a outlook or thunderbird message and then save the message to somewhere. Then open the file with a text editor and see B64 code :)

It functions on Windows, but I think it is a universal way since saving as .EML the attachment is encoded to B64.