我的密码脚本加密有多安全？(Golang,AES256,pbkdf2,hmac)

Des*_*Lee 1 security encryption aes go kdf

首先,我想说这只是一个学习练习,我不打算在生产中使用它.

encrypt(plaintext string, password string)decrypt(encrypted string, password string)

加密步骤是:

生成随机256位以用作盐
生成128位以用作初始化向量
使用PDKDF2从密码和salt生成32位密钥
使用密钥和明文生成32位HMAC,并将其附加到明文的开头
在CFB模式下使用AES加密hmac + plaintext

返回的字节数组如下所示:

[256 bit salt] [128 bit iv] encrypted([256 bit hmac] [plaintext])

解密时:

提取salt并使用提供的密码来计算密钥
提取IV并解密密文的加密部分
从解密的值中提取mac
用明文验证mac

我没有疯狂到在任何生产项目中使用我自己的加密脚本,所以请指向我这样做的任何库(简单的密码/消息加密相对安全)

这是两个函数的源代码:

package main

import (
    "io"
    "crypto/rand"
    "crypto/cipher"
    "crypto/aes"
    "crypto/sha256"
    "crypto/hmac"
    "golang.org/x/crypto/pbkdf2"
)


const saltlen = 32
const keylen = 32
const iterations = 100002

// returns ciphertext of the following format:
// [32 bit salt][128 bit iv][encrypted plaintext]
func encrypt(plaintext string, password string) string {
    // allocate memory to hold the header of the ciphertext
    header := make([]byte, saltlen + aes.BlockSize)

    // generate salt
    salt := header[:saltlen]
    if _, err := io.ReadFull(rand.Reader, salt); err != nil {
        panic(err)
    }

    // generate initialization vector
    iv := header[saltlen:aes.BlockSize+saltlen]
    if _, err := io.ReadFull(rand.Reader, iv); err != nil {
        panic(err)
    }

    // generate a 32 bit key with the provided password
    key := pbkdf2.Key([]byte(password), salt, iterations, keylen, sha256.New)

    // generate a hmac for the message with the key
    mac := hmac.New(sha256.New, key)
    mac.Write([]byte(plaintext))
    hmac := mac.Sum(nil)

    // append this hmac to the plaintext
    plaintext = string(hmac) + plaintext

    //create the cipher
    block, err := aes.NewCipher(key)
    if err != nil {
        panic(err)
    }

    // allocate space for the ciphertext and write the header to it
    ciphertext := make([]byte, len(header) + len(plaintext))
    copy(ciphertext, header)

    // encrypt
    stream := cipher.NewCFBEncrypter(block, iv)
    stream.XORKeyStream(ciphertext[aes.BlockSize+saltlen:], []byte(plaintext))
    return string(ciphertext)
}

func decrypt(encrypted string, password string) string {
    ciphertext := []byte(encrypted)
    // get the salt from the ciphertext
    salt := ciphertext[:saltlen]
    // get the IV from the ciphertext
    iv := ciphertext[saltlen:aes.BlockSize+saltlen]
    // generate the key with the KDF
    key := pbkdf2.Key([]byte(password), salt, iterations, keylen, sha256.New)

    block, err := aes.NewCipher(key)
    if (err != nil) {
        panic(err)
    }

    if len(ciphertext) < aes.BlockSize {
        return ""
    }

    decrypted := ciphertext[saltlen+aes.BlockSize:]
    stream := cipher.NewCFBDecrypter(block, iv)
    stream.XORKeyStream(decrypted, decrypted)

    // extract hmac from plaintext
    extractedMac := decrypted[:32]
    plaintext := decrypted[32:]

    // validate the hmac
    mac := hmac.New(sha256.New, key)
    mac.Write(plaintext)
    expectedMac := mac.Sum(nil)
    if !hmac.Equal(extractedMac, expectedMac) {
        return ""
    }

    return string(plaintext)
}

我的密码脚本加密有多安全？(Golang,AES256,pbkdf2,hmac) |