I have encrypted some JSON Text using following Node JS code:-
var algorithm = 'aes-256-ctr';
var crypto = require('crypto');
var password = "6A80FD8D38D579D1090F6CDB62C729311781E4BA31CD7D804BD7BF5AEC3BFC2D"
var typedRequest = {"abc":"cde"}
var cipher = crypto.createCipher(algorithm, password);
var hashRequest = cipher.update(JSON.stringify(typedRequest),
'utf8', 'hex');
hashRequest += cipher.final('hex');
And now, I wanted to decrypt this encryptedText in Golang. But I am not able to found any way to do this, since in almost all decryption logic examples of AES 256 CTR in Golang, I found it always requires IV while decrypting but I have not use the same in Node JS. I have written something in Golang but its not decrypting correctly and giving error for now:-
package main
import (
"crypto/aes"
"crypto/cipher"
"encoding/hex"
"fmt"
)
func main() {
encKey := "6A80FD8D38D579D1090F6CDB62C729311781E4BA31CD7D804BD7BF5AEC3BFC2D"
cipherText := "746c17cd10f8f86646f843ac2a"
encKeyDecoded, err := hex.DecodeString(encKey)
if err != nil {
panic(err)
}
cipherTextDecoded, err := hex.DecodeString(cipherText)
if err != nil {
panic(err)
}
iv := cipherTextDecoded[:aes.BlockSize]
block, err := aes.NewCipher([]byte(encKeyDecoded))
if err != nil {
panic(err)
}
cipherTextBytes := []byte(cipherTextDecoded)
plaintext := make([]byte, len(cipherTextBytes) - aes.BlockSize)
stream := cipher.NewCTR(block, iv)
stream.XORKeyStream(plaintext, cipherTextBytes[aes.BlockSize:])
fmt.Println(string(plaintext))
}
Any help in getting the correct Golang code is highly appreciated. Thanks
=====================================
Now, I have updated to following after taking suggestion from Answer:-
This is my node js code:-
var crypto = require('crypto'),
algorithm = 'aes-256-ctr',
password = '6A80FD8D38D579D1090F6CDB62CA34CA',
// do not use a global iv for production,
// generate a new one for each encryption
iv = '79b67e539e7fcadf'
var typedRequest = {"abc":"cde"}
var cipher = crypto.createCipheriv(algorithm, password, iv);
var hashRequest = cipher.update(JSON.stringify(typedRequest),
'utf8', 'hex');
hashRequest += iv.toString('hex') + cipher.final('hex');
This is my Go code:-
package main
import (
"crypto/aes"
"crypto/cipher"
"encoding/hex"
"fmt"
)
func main() {
encKey := "6A80FD8D38D579D1090F6CDB62CA34CA"
cipherText := "af7d1eb42107549a7e3adbce1a79b67e539e7fcadf" // Got from above
encKeyDecoded, err := hex.DecodeString(encKey)
if err != nil {
panic(err)
}
cipherTextDecoded, err := hex.DecodeString(cipherText)
if err != nil {
panic(err)
}
block, err := aes.NewCipher([]byte(encKeyDecoded))
if err != nil {
panic(err)
}
iv := cipherTextDecoded[:aes.BlockSize]
cipherTextBytes := []byte(cipherTextDecoded)
plaintext := make([]byte, len(cipherTextBytes) - aes.BlockSize)
stream := cipher.NewCTR(block, iv)
stream.XORKeyStream(plaintext, cipherTextBytes[aes.BlockSize:])
fmt.Println(string(plaintext))
}
Now, I am getting something completely different in decrypted form.