Base64 decode to file

The internet sometimes sucks. I spent about 20 minutes searching the internet for an easy way to decode a base64 file in linux. Shouldn't be that hard. In fact, there is a base64 command. But fuck me, I sure couldn't get it to work with the file I had (which was supposed to decode into a .jpg). There is tons of nonsense about the theory and some stupid unhelpful web applications, but no practical examples. That is, until I stumbled upon this little gem - which gave me exactly what I wanted.

perl -MMIME::Base64 -ne 'print decode_base64($_)' < file.txt > out

A one-liner in Perl (of course). The fact that this info was so easy, yet it was so hard to find pisses me off. I'm sure there are other ways to do this. In fact, if you know of other ways to do this, then please leave me a comment telling me how. I hate when good info gets buried under the load of crap clogging the internet tubes.

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Comments

Anonymous said…
That rocks. It REALLY does. I too was pissed about the Linux base64 encode/decode situation, and then this falls in my lap. Way cool. It works for encoding too, with the obvious substitution.
Anonymous said…
Encoding data:

# echo "{SASL}joe_montana@EXAMPLE.COM" | openssl base64 -e
e1NBU0x9am9lX21vbnRhbmFARVhBTVBMRS5DT00K

Decoding data:

echo "e1NBU0x9am9lX21vbnRhbmFARVhBTVBMRS5DT00K" | openssl base64 -d
{SASL}joe_montana@EXAMPLE.COM

Note: Using the same openssl base64 command, input can be taken from a file (using -in argument) and output can be written to a file (using -out argument) as well.
Dotan Cohen said…
$ base64 -d < in.jpg > out.jpg
Anonymous said…
decode:
$ openssl enc -base64 -in in_file -d

encode:
$ openssl enc -base64 -in in_file -e
Anonymous said…
This comment has been removed by a blog administrator.
Anonymous said…
This comment has been removed by a blog administrator.
Anonymous said…
You can use linux pipe command '|' from standard in,

echo stringtoencode | base64 -

or

echo stringtodecode | base64 -d -

Technically you do not need the last hyphen because base64 defaults to look at standard in, but that is to show you how | can be used with other programs as well.
Anonymous said…
Thanks for posting this. It was the perfect answer. I too was getting a bit irritated looking for how to do this.

Eric
Anonymous said…
Hi, now is 2012 and many peoples still confusing how base64 encoding/decoding work.....

I read this line from openssl home page;

echo -n password | openssl dgst -md5 -binary | openssl base64
// result :
X03MO1qnZdYdgyfeuILPmQ==

what I want to know is, how to get back original "password" string from "X03MO1qnZdYdgyfeuILPmQ=="????
Anonymous said…
To the above anon, regarding undoing this command:

echo -n password | openssl dgst -md5 -binary | openssl base64

You can undo the "openssl base64" part using any of the methods indicated here ("base64 -d" or "openssl enc -base64 -d"). However, the "openssl dgst -md5" is finding the MD5 hash of "password". Computing the MD5 is a one-way lossy operation, and cannot be reversed except by brute-force.
Anonymous said…
To the above anon, regarding undoing this command:

echo -n password | openssl dgst -md5 -binary | openssl base64

You can undo the "openssl base64" part using any of the methods indicated here ("base64 -d" or "openssl enc -base64 -d"). However, the "openssl dgst -md5" is finding the MD5 hash of "password". Computing the MD5 is a one-way lossy operation, and cannot be reversed except by brute-force.
Kooiker said…
$ base64 -d < in.jpg > out.jpg
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