Go AES Encryptor

This is a POC for go encryption with AES in GCM mode.

use via command line go run gocryptor.go:

• -f The path to the file you want to encrypt/decrypt
• -d Decrypt the file
• -e Encrypt the file
• -p The key file used to encrypt/decrypt the file (16/24/32 bytes) - Base64 in file expected
• -i The identification vector(iv/nonce) (should change for every encryption) - Base64 Expected
• -t The tag - Base64 Expected
• -a The additional authentication data string

Encrypt

go run gocryptor.go -e -f ./myfile.txt -p ./base64key.key -i jQm0NcAOSkiAVFc9qGpMfA== -a AA_BB_CC_DD_EE

This will give you the tag save it, you will need it below.

Decrypt

go run gocryptor.go -d -f ./myfile.encrypted -p ./base64key.key -i jQm0NcAOSkiAVFc9qGpMfA== -a AA_BB_CC_DD_EE -t Z7s5GCSrSBcIoj+FvFNprw==

Resources

This was my first encryption project so I'll leave below some ressources I used to create this project for legacy.

• https://pkg.go.dev/crypto/cipher
• https://cs.opensource.google/go/go/+/master:src/crypto/aes/aes_gcm.go;l=70;drc=master;bpv=1;bpt=1
• https://github.com/dvsekhvalnov/jose2go/blob/master/aes_gcm.go
• https://crypto.stackexchange.com/questions/41601/aes-gcm-recommended-iv-size-why-12-bytes
• https://stackoverflow.com/questions/47382035/unable-to-decrypt-after-aes-gcm-base64-in-go
• https://github.com/dvsekhvalnov/jose2go/blob/master/aes_gcm.go
• https://stackoverflow.com/questions/68040875/aes-256-gcm-encryption-from-ruby-decryption-with-golang
• https://cloud.google.com/kms/docs/additional-authenticated-data
• https://stackoverflow.com/a/68353192
• golang/go#42470
• https://github.com/parkerdouglass/fcrypt/blob/master/main.go
• https://gist.github.com/cannium/c167a19030f2a3c6adbb5a5174bea3ff
• https://stackoverflow.com/questions/39347206/how-to-encrypt-files-with-aes256-gcm-in-golang
• https://github.com/SimonWaldherr/golang-examples/blob/master/advanced/aesgcm.go
• https://eli.thegreenplace.net/2019/aes-encryption-of-files-in-go/
• rfjakob/gocryptfs#222 (comment)
• https://github.com/Xeoncross/go-aesctr-with-hmac/blob/master/crypt.go
• https://github.com/gtank/cryptopasta/blob/master/encrypt.go
• https://levelup.gitconnected.com/a-short-guide-to-encryption-using-go-da97c928259f