我通过@osgx的帮助解决了这个问题。

这些是我需要更改以正确解密的事情。

1. 解码我使用的所有十六进制字符串。
   

2. 我检查了nodejs文档，并且密码方法/算法使用与 openssl 类似的命名方案。所以，我运行了这个命令 openssl list-cipher-algorithms | grepAES256，我得到了这样的输出， AES256 => AES-256-CBC 这意味着，如果我在nodejs中使用 aes256 ，它确实会做 aes -256-CBC 。然后我检查了我的golang代码，并且使用了 aes-256-cfb ，这是错误的。所以，我改变了这个，并使用了一个cbc解密器。
   

更改这两个东西会给出正确的结果。

非常感谢@osgx的帮助。

我的更新代码是：

 软件包主要

导入（
加密/ aes
加密/密码
encoding / hex
fmt

）

 func main（）{

 encKey：=c38036f65157cb6db0e8fd855aa28ada074be71917d1c8eedc2ae4d85e3c9da6 
四：= 79b67e539e7fcaefa7abf167de5c06ed 
密文：= c02eccfc514a0b7fae830586dd56e0fcebb81fc49f41fa6dedf099c3645793bef7ec7075eca30063f9c0ef395d5ee2d44e4f3490114280abb7cf86d6eb525e2ec9bd2b781388986480f8b3df95f7b10e 

 encKeyDecoded，ERR：= hex.DecodeString（encKey）
如果ERR =零{！ 
 panic（err）
} 
 cipherTextDecoded，err：= hex.DecodeString（cipherText）
 if err！= nil {
 panic（err）
 } 
 ivDecoded，err：= hex.DecodeString（iv）
 if err！= nil {
 panic（err）
} 
 block，err：= aes。 NewCipher（[] byte（encKeyDecoded））
 if err！= nil {
 panic（err）
} 

 mode：= cipher.NewCB​​CDecrypter（block，[] byte（ivDecoded ））

 mode.CryptBlocks（[] byte（cipherTextDecoded），[] byte（cipherTextDecoded））

 fmt.Println（string（cipherTextDecoded））
} 
 

https://play.golang.org/p/Zv24WoKtBY

I encrypted a string in Node.js like this.

var cipher = crypto.createCipheriv(
"aes256",
"<A Buffer of length 32>",
"79b67e539e7fcaefa7abf167de5c06ed"  
);

I noticed that a buffer in nodejs is like hex but every 2 consecutive characters are paired. So, It's length is half of whatever will come out if I convert it to a hex.

Example:

Buffer:

<Buffer c3 80 36 f6 51 57 cb 6d b0 e8 fd 85 5a a2 8a da 07 4b e7 19 17 d1 c8 ee dc 2a e4 d8 5e 3c 9d a6>

Hex:

c38036f65157cb6db0e8fd855aa28ada074be71917d1c8eedc2ae4d85e3c9da6

Now, The key I use in aes256 can not be of length 64. Here, Buffer's length is 32 and hex's length is 64.

I want to decrypt this cipher in golang and I'll have to use this key and iv to decrypt it.

aes in golang takes a length depending upon the size of key and when it sees a key of length 64 it throws an error that says, Invalid key length.

How do I decrypt it in golang? There is my current program in go: https://play.golang.org/p/SoXOz3XIPK

package main

import (
    "crypto/aes"
    "crypto/cipher"
    "fmt"
    "log"
)

func main() {

    encKey := "c38036f65157cb6db0e8fd855aa28ada074be71917d1c8eedc2ae4d85e3c9da6"
    iv := "79b67e539e7fcaefa7abf167de5c06ed"
    cipherText := "c02eccfc514a0b7fae830586dd56e0fcebb81fc49f41fa6dedf099c3645793bef7ec7075eca30063f9c0ef395d5ee2d44e4f3490114280abb7cf86d6eb525e2ec9bd2b781388986480f8b3df95f7b10e"

    block, err := aes.NewCipher([]byte(encKey))
    if err != nil {
        log.Fatalf("%s", err)
    }

    decrypter := cipher.NewCFBDecrypter(block, []byte(iv))

    decrypted := make([]byte, 1000)
    decrypter.XORKeyStream(decrypted, []byte(cipherText))

    fmt.Printf("%s\n", string(decrypted))

}

I solved this problem with help from @osgx

These are the things that I needed to change to decrypt correctly.

1. Decode all hex strings that I was using.

2. I checked nodejs documentation and the cipher methods/algorithms use similar naming scheme as openssl. So, I ran this command openssl list-cipher-algorithms | grep "AES256"and I got an output like this, AES256 => AES-256-CBC which means that, if I am using aes256 in nodejs, It'll really be doing aes-256-cbc. Then I checked my golang code and I was using aes-256-cfb which is wrong. So, I changed that and used a cbc decrypter.

Changing these two things gives proper results.

Thank you so much for the help @osgx.

My updated code is:

package main

import (
    "crypto/aes"
    "crypto/cipher"
    "encoding/hex"
    "fmt"

)

func main() {

    encKey := "c38036f65157cb6db0e8fd855aa28ada074be71917d1c8eedc2ae4d85e3c9da6"
    iv := "79b67e539e7fcaefa7abf167de5c06ed"
    cipherText := "c02eccfc514a0b7fae830586dd56e0fcebb81fc49f41fa6dedf099c3645793bef7ec7075eca30063f9c0ef395d5ee2d44e4f3490114280abb7cf86d6eb525e2ec9bd2b781388986480f8b3df95f7b10e"

    encKeyDecoded, err := hex.DecodeString(encKey)
    if err != nil {
        panic(err)
    }
    cipherTextDecoded, err := hex.DecodeString(cipherText)
    if err != nil {
        panic(err)
    }
    ivDecoded, err := hex.DecodeString(iv)
    if err != nil {
        panic(err)
    }
    block, err := aes.NewCipher([]byte(encKeyDecoded))
    if err != nil {
        panic(err)
    }

    mode := cipher.NewCBCDecrypter(block, []byte(ivDecoded))

    mode.CryptBlocks([]byte(cipherTextDecoded), []byte(cipherTextDecoded))

    fmt.Println(string(cipherTextDecoded))
}

https://play.golang.org/p/Zv24WoKtBY