github.com/JeffDeCola/my-go-tools/cryptography-tools/md5-hash-file

md5-hash-file TOOL

Get an md5 hash (fingerprint) from an input file using the crypto/md5 standard package. I also added a flag to read in your .ssh/id_rsa.pub key to get your ssh fingerprint.

tl;dr

# INSTALL VIA GO
go install md5-hash-file.go

# GET MD5 FINGERPRINT ON FILE
md5-hash-file testfile.txt

# GET MD5 FINGERPRINT ON KEY FILE
md5-hash-file -ssh ~/.ssh/id_rsa.pub

Table of Contents

• OVERVIEW
• PREREQUISITES
• RUN
• TEST
• INSTALL
• USAGE
  • -h
  • -v
  • -ssh
  • -loglevel string

Documentation and Reference

• crypto/md5 standard package

OVERVIEW

In a nutshell, the guts of the code is,

plainTextBytes := []byte(plainText)

// HASH
md5HashByte := md5.Sum(plainTextBytes)

// CONVERT TO STRING
md5Hash := hex.EncodeToString(md5HashByte[:])

PREREQUISITES

You will need the following go packages,

go get -u -v github.com/sirupsen/logrus

RUN

To run.sh,

go run . testfile.txt
go run md5-hash-file.go testfile.txt
go run md5-hash-file.go testfile.txt -loglevel trace

If you run on testfile.txt your md5 hash shall be,

950dc9055bc2eb9b1f143e92d7bee6c4

You may also use the -ssh flag to read in a public ssh key file,

go run . -ssh ~/.ssh/id_rsa.pub
go run md5-hash-file.go -ssh ~/.ssh/id_rsa.pub
go run md5-hash-file.go -ssh ~/.ssh/id_rsa.pub -loglevel trace

Its nice because you can check you have the right fingerprint at github.com/settings/keys.

You can also run the unix command to check your md5,

ssh-keygen -l -E md5 -f ~/.ssh/id_rsa.pub

TEST

To create _test files,

gotests -w -all md5-hash-file.go

To unit-tests.sh,

go test -cover ./... | tee test/test_coverage.txt
cat test/test_coverage.txt

INSTALL

Will place an executable in your go bin,

go install md5-hash-file.go

USAGE

md5-hash-file {-h|-v|-ssh} [FILENAME] -loglevel [level] 

-h

Help,

md5-hash-file -h

-v

Version,

md5-hash-file -v

-ssh

Check your public ssh file,

md5-hash-file -ssh ~/.ssh/id_rsa.pub

-loglevel string

Can use trace, info or error,

md5-hash-file -ssh ~/.ssh/id_rsa.pub -loglevel trace