blob: bab07b5cb95d11ae088d74817cabab2baead2a5b (
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package main
import (
"crypto/aes"
"crypto/cipher"
"encoding/hex"
"errors"
"io/ioutil"
"os"
)
func main() {
err := inner()
if err != nil {
panic(err.Error())
}
}
func inner() error {
if len(os.Args) < 3 {
return errors.New("usage: ./decrypt-aes-gcm <key> <nonce> < input-file > output-file")
}
key, err := hex.DecodeString(os.Args[1])
if err != nil {
return err
}
nonce, err := hex.DecodeString(os.Args[2])
if err != nil {
return err
}
ciphertext, err := ioutil.ReadAll(os.Stdin)
if err != nil {
return err
}
block, err := aes.NewCipher(key)
if err != nil {
return err
}
aesgcm, err := cipher.NewGCM(block)
if err != nil {
return err
}
plaintext, err := aesgcm.Open(nil, nonce, ciphertext, nil)
if err != nil {
return err
}
_, err = os.Stdout.Write(plaintext)
if err != nil {
return err
}
return nil
}
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