How to create md5 hash in bash in Mac OS X
MacosBashCryptographyMacos Problem Overview
How can you create an md5 hash for a string on a mac using bash
? md5sum
does not exist in my environment. I did a man
for md5 but I'm confused about what that really does.
md5 "string"
does not return a hash.
Macos Solutions
Solution 1 - Macos
This should work -
[jaypal:~/Temp] echo "this will be encrypted" | md5
72caf9daf910b5ef86796f74c20b7e0b
or if you prefer here string
notation then -
[jaypal:~/Temp] md5 <<< 'this will be encrypted'
72caf9daf910b5ef86796f74c20b7e0b
UPDATE:
Per the man
page, you can play around with any of the following options
-s string
Print a checksum of the given string.
-p Echo stdin to stdout and append the checksum to stdout.
-q Quiet mode - only the checksum is printed out. Overrides the -r option.
[jaypal:~/Temp] md5 -s 'this will be encrypted'
MD5 ("this will be encrypted") = 502810f799de274ff7840a1549cd028a
[jaypal:~/Temp] md5 -qs 'this will be encrypted'
502810f799de274ff7840a1549cd028a
Note: MD5 always produces the same hash. The reason you find the output different from the example given above is due to a point that has been made in the comments. The first two examples use the trailing newline
character to produce the hash. To avoid that, you can use:
[jaypal:~/Temp] echo -n "this will be encrypted" | md5
502810f799de274ff7840a1549cd028a
For example, if you use echo -n "string" | md5
(note the -n
option), you get b45cffe084dd3d20d928bee85e7b0f21
. But, if you use echo "string" | md5
, you get b80fa55b1234f1935cea559d9efbc39a
.
Or, verify it with the shell:
➜ [jaypal:~/Temp] [ $(echo "HOLA" | md5) = $(echo "HOLA" -n | md5) ]; echo "$?"
1
# 1 -> False. Hence, the result from echoing "HOLA" toggling the -n flag
# outputs different md5 checksums.
Solution 2 - Macos
To achieve what you asked:
md5 -s string
outputs: MD5 ("string") = b45cffe084dd3d20d928bee85e7b0f21
Solution 3 - Macos
OSX uses md5
but most unices use md5sum
Here is a section of rvm's rvmrc validation code which finds the correct md5 binary and wraps it.
__rvm_md5_for()
{
if builtin command -v md5 > /dev/null; then
echo "$1" | md5
elif builtin command -v md5sum > /dev/null ; then
echo "$1" | md5sum | awk '{print $1}'
else
rvm_error "Neither md5 nor md5sum were found in the PATH"
return 1
fi
return 0
}
( Code from https://github.com/wayneeseguin/rvm/blob/master/scripts/functions/rvmrc )
Solution 4 - Macos
The correct way of doing that would be echo -n string | md5
instead of echo "string" | md5
. (I am using zsh)
Convert the md5 hash given by echo -n string | md5
you will get back string
.
md5 -s string
also works which is already pointed out here.
λ [~] → echo "string" | md5
b80fa55b1234f1935cea559d9efbc39a
λ [~] → echo -n string | md5
b45cffe084dd3d20d928bee85e7b0f21
λ [~] → md5 -s string
MD5 ("string") = b45cffe084dd3d20d928bee85e7b0f21
Solution 5 - Macos
All the other answers are valid. I would like to also propose openssl
as well:
➜ echo 'this will be hashed' | openssl md5
55be2dc2df2c1cc7bad72a0ecb338841
which is equivalent to the following
➜ echo 'this will be hashed' | openssl dgst -md5
# or
➜ openssl md5 <<< 'this will be hashed'
# or
➜ echo 'this will be hashed' | md5
Solution 6 - Macos
From the command line:
md5 <<< "String to hash"
8a0a39505c5753ff64a0377ab0265509
Solution 7 - Macos
You may want to use some randomness here, otherwise the password will always be the same. This should work:
dd if=/dev/random count=20|md5