我试图用c和javascript编写两个类，在交换数据时，我可以在整个项目中使用它们来使用aes加密或解密数据。
使用aes i将salt（32字节）和iv（16字节）嵌入到加密结果中，在测试时，这对这两个类都很好。将salt和iv添加到这个组合中并不会带来太多的参考，从而使这两个平台之间能够正常工作。
对于c我使用的是标准的system.security.crypthography.aes
private static readonly int iterations = 1000;
public static string Encrypt(string input, string password)
{
byte[] encrypted;
byte[] IV;
byte[] Salt = GetSalt();
byte[] Key = CreateKey(password, Salt);
using (Aes aesAlg = Aes.Create())
{
aesAlg.Key = Key;
aesAlg.Padding = PaddingMode.PKCS7;
aesAlg.Mode = CipherMode.CBC;
aesAlg.GenerateIV();
IV = aesAlg.IV;
var encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);
using (var msEncrypt = new MemoryStream())
{
using (var csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
{
using (var swEncrypt = new StreamWriter(csEncrypt))
{
swEncrypt.Write(input);
}
encrypted = msEncrypt.ToArray();
}
}
}
byte[] combinedIvSaltCt = new byte[Salt.Length + IV.Length + encrypted.Length];
Array.Copy(Salt, 0, combinedIvSaltCt, 0, Salt.Length);
Array.Copy(IV, 0, combinedIvSaltCt, Salt.Length, IV.Length);
Array.Copy(encrypted, 0, combinedIvSaltCt, Salt.Length + IV.Length, encrypted.Length);
return Convert.ToBase64String(combinedIvSaltCt.ToArray());
}
public static string Decrypt(string input, string password)
{
byte[] inputAsByteArray;
string plaintext = null;
try
{
inputAsByteArray = Convert.FromBase64String(input);
byte[] Salt = new byte[32];
byte[] IV = new byte[16];
byte[] Encoded = new byte[inputAsByteArray.Length - Salt.Length - IV.Length];
Array.Copy(inputAsByteArray, 0, Salt, 0, Salt.Length);
Array.Copy(inputAsByteArray, Salt.Length, IV, 0, IV.Length);
Array.Copy(inputAsByteArray, Salt.Length + IV.Length, Encoded, 0, Encoded.Length);
byte[] Key = CreateKey(password, Salt);
using (Aes aesAlg = Aes.Create())
{
aesAlg.Key = Key;
aesAlg.IV = IV;
aesAlg.Mode = CipherMode.CBC;
aesAlg.Padding = PaddingMode.PKCS7;
ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
using (var msDecrypt = new MemoryStream(Encoded))
{
using (var csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (var srDecrypt = new StreamReader(csDecrypt))
{
plaintext = srDecrypt.ReadToEnd();
}
}
}
}
return plaintext;
}
catch (Exception e)
{
return null;
}
}
public static byte[] CreateKey(string password, byte[] salt)
{
using (var rfc2898DeriveBytes = new Rfc2898DeriveBytes(password, salt, iterations))
return rfc2898DeriveBytes.GetBytes(32);
}
private static byte[] GetSalt()
{
var salt = new byte[32];
using (var random = new RNGCryptoServiceProvider())
{
random.GetNonZeroBytes(salt);
}
return salt;
}
对于我使用cryptojs的javascript解决方案，基于这个引用http://www.adonespitogo.com/articles/encrypting-data-with-cryptojs-aes/
var keySize = 256;
var ivSize = 128;
var saltSize = 256;
var iterations = 1000;
var message = "Hello World";
var password = "Secret Password";
function encrypt (msg, pass) {
var salt = CryptoJS.lib.WordArray.random(saltSize/8);
var key = CryptoJS.PBKDF2(pass, salt, {
keySize: keySize/32,
iterations: iterations
});
var iv = CryptoJS.lib.WordArray.random(ivSize/8);
var encrypted = CryptoJS.AES.encrypt(msg, key, {
iv: iv,
padding: CryptoJS.pad.Pkcs7,
mode: CryptoJS.mode.CBC
});
// salt, iv will be hex 32 in length
// append them to the ciphertext for use in decryption
var transitmessage = salt + iv + encrypted;
return transitmessage.toString();
}
function decrypt (transitmessage, pass) {
var salt = CryptoJS.enc.Hex.parse(transitmessage.substr(0, 64));
var iv = CryptoJS.enc.Hex.parse(transitmessage.substr(64, 32));
var encrypted = transitmessage.substring(96);
var key = CryptoJS.PBKDF2(pass, salt, {
keySize: keySize/32,
iterations: iterations
});
var decrypted = CryptoJS.AES.decrypt(encrypted, key, {
iv: iv,
padding: CryptoJS.pad.Pkcs7,
mode: CryptoJS.mode.CBC
})
return decrypted.toString(CryptoJS.enc.Utf8);
}
使用的密码：
Secret PasswordC结果：
r7Oi1vMXZ5mYJay8i+slbJZEiT3CxV/1zOYntbZIsS5RuasABJKQQQVvAe50U1deIIqyQiwzQWYelMJ48WWpMQ==javascript结果：
72ff8e7b653efbe3101d2c4ca7d7fe1af06652b907a90281aafa5ae09b45c9af091571b08d3d39cbad129939488319b2pprMQFFEJZR5JlrDsMqT8w==结果应该
Hello World这两种解决方案在各自的环境中都能很好地工作，但是c或javascript散列不能交换，它们不会解密。我的猜测是字符编码与此有关，因此base64的大小差异很大。有人想办法把这件事搞清楚吗？谢谢！
最佳答案：
错误出现在javascript代码中，第一部分是十六进制，最后是base64中的加密结果。
下面的javascript代码使aes结果可以与上面提供的c解决方案互换。我有一些困难，以确保所有的结果正确编码和十六进制解码，所以有一些新的功能。
var keySize = 256;
var ivSize = 128;
var saltSize = 256;
var iterations = 1000;
var message = "Does this work?";
var password = "Secret Password";
function encrypt (msg, pass) {
var salt = CryptoJS.lib.WordArray.random(saltSize/8);
var key = CryptoJS.PBKDF2(pass, salt, {
keySize: keySize/32,
iterations: iterations
});
var iv = CryptoJS.lib.WordArray.random(ivSize/8);
var encrypted = CryptoJS.AES.encrypt(msg, key, {
iv: iv,
padding: CryptoJS.pad.Pkcs7,
mode: CryptoJS.mode.CBC
});
var encryptedHex = base64ToHex(encrypted.toString());
var base64result = hexToBase64(salt + iv + encryptedHex);
return base64result;
}
function decrypt (transitmessage, pass) {
var hexResult = base64ToHex(transitmessage)
var salt = CryptoJS.enc.Hex.parse(hexResult.substr(0, 64));
var iv = CryptoJS.enc.Hex.parse(hexResult.substr(64, 32));
var encrypted = hexToBase64(hexResult.substring(96));
var key = CryptoJS.PBKDF2(pass, salt, {
keySize: keySize/32,
iterations: iterations
});
var decrypted = CryptoJS.AES.decrypt(encrypted, key, {
iv: iv,
padding: CryptoJS.pad.Pkcs7,
mode: CryptoJS.mode.CBC
})
return decrypted.toString(CryptoJS.enc.Utf8);
}
function hexToBase64(str) {
return btoa(String.fromCharCode.apply(null,
str.replace(/\r|\n/g, "").replace(/([\da-fA-F]{2}) ?/g, "0x$1 ").replace(/ +$/, "").split(" "))
);
}
function base64ToHex(str) {
for (var i = 0, bin = atob(str.replace(/[ \r\n]+$/, "")), hex = []; i < bin.length; ++i) {
var tmp = bin.charCodeAt(i).toString(16);
if (tmp.length === 1) tmp = "0" + tmp;
hex[hex.length] = tmp;
}
return hex.join("");
}