AES implementation in Golang.

Tested

	128bit	192bit	256bit
ECB	✅	✅	✅
CBC	✅	✅	✅
CFB	✅	✅	✅
OFB	✅	✅	✅
CTR	✅	✅	✅
GCM	✅	✅	✅

All results are the same as CyberChef

How To Use

Just run go run main.go

encrypt

encrypt -m GCM -p aes_plain1.txt -k aes_key.txt -v aes_iv.txt -c aes_cipher.txt -a aes_auth.txt --tag aes_tag.txt

decrypt

decrypt -m GCM -p aes_plain1.txt -k aes_key.txt -v aes_iv.txt -c aes_cipher.txt -a aes_auth.txt --tag aes_tag.txt

help

help encrypt or help decrypt

Arguments

key

Not being 128, 192, or 256 bits leads to an error.

initial vector

Shorter than 128 bits, error. Add a 0 to the last second position when the length is odd. Example:5072656E7469636548616C6C496E632 considered as 5072656E7469636548616C6C496E6302

Longer than 128 bit, only first 128 bits count.

Specially, iv length can be any in GCM mode.

plaintext length

Since padding function is used, the length does not matter. Also, add a 0 to the last second position when the length is odd.

authentication message (GCM)

Can be any length.

tag (GCM)

Be specified as 128bit.

Run

NAME:
   AES encryption and decryption - AES Encrypt and Decrypt

USAGE:
   aes_impl [global options] command [command options] [arguments...]

COMMANDS:
   encrypt  AES Encrypt
   decrypt  AES Decrypt
   help, h  Shows a list of commands or help for one command

GLOBAL OPTIONS:
   --help, -h  show help (default: false)
> encrypt -m GCM -p aes_plain1.txt -k aes_key.txt -v aes_iv.txt -c aes_cipher.txt -a aes_auth.txt --tag aes_tag.txt
keyExpansion:
word[00]: 69616d53 74616576 96c6cc6c 696e6777 
word[01]: f7e498aa 8385fddc 154331b0 7c2d56c7 
word[02]: 2d555eba aed0a366 bb9392d6 c7bec411 
word[03]: 8749dc7c 29997f1a 920aedcc 55b429dd 
word[04]: 02ec1d80 2b75629a b97f8f56 eccba68b 
word[05]: 0dc8204e 26bd42d4 9fc2cd82 73096b09 
word[06]: 2cb721c1 0a0a6315 95c8ae97 e6c1c59e 
word[07]: 14112a4f 1e1b495a 8bd3e7cd 6d122253 
word[08]: 5d82c773 43998e29 c84a69e4 a5584bb7 
word[09]: 2c316e75 6fa8e05c a7e289b8 02bac20f 
word[10]: ee141802 81bcf85e 265e71e6 24e4b3e9 

aes_impl-128 GCM encrypted ciphertext:
block[0]: 009f9302 7c82a512 43ceff1b 56bd97c8
block[1]: 57a7122f 54eb124c d339af0c 7a00080a
block[2]: c1638c39 32b6695c 64f7cd94 6cdeb103
block[3]: d369e30e a5a75892 07db7e5a 2c4d4057
block[4]: fd

tag:
block[0]: ffdab598 c8ea91dd 78b854d0 12eebcd2

> 

Thanks

Thanks to urfave and otokaze for CLI tools.