[英]C# encrypt/decrypt methods which are equivalent to PHP7 openssl
我在加密/解密数据的 PHP 7 程序中有以下几行:
$key = base64_decode("mykey===");
$iv = substr(hash('sha256', "myiv======"), 0, 16);
printf(base64_encode(openssl_encrypt("hello", "aes-256-cbc", $key, OPENSSL_RAW_DATA, $iv)));
printf("<br>");
printf(openssl_decrypt(base64_decode("2XJxQXSbPuJ9LMsZ/FESGw=="), "aes-256-cbc", $key, OPENSSL_RAW_DATA, $iv));
这是有效的,PHP 将“hello”解密为“2XJxQXSbPuJ9LMsZ/FESGw==”,反之亦然。 但是,我正在尝试使用 C# 解密和加密相同的数据(来自数据库),但似乎无法弄清楚。 我使用以下方法进行解密(C#):
private string aes_decrypt(string cipherText, string key, string iv)
{
RijndaelManaged aes = new RijndaelManaged();
aes.KeySize = 256;
aes.BlockSize = 128;
aes.Mode = CipherMode.CBC;
aes.Padding = PaddingMode.None;
aes.Key = Convert.FromBase64String(key);
aes.IV = Encoding.UTF8.GetBytes(iv);
if (aes.Key.Length < 32)
{
var paddedkey = new byte[32];
Buffer.BlockCopy(aes.Key, 0, paddedkey, 0, aes.Key.Length);
aes.Key = paddedkey;
}
var decrypt = aes.CreateDecryptor();
byte[] xBuff = null;
using (var ms = new MemoryStream())
{
using (var cs = new CryptoStream(ms, decrypt, CryptoStreamMode.Write))
{
byte[] xXml = Convert.FromBase64String(cipherText);
cs.Write(xXml, 0, xXml.Length);
}
xBuff = ms.ToArray();
}
String Output = Encoding.UTF8.GetString(xBuff);
return Output;
}
但是调用这个方法:
string encryptionkey = "mykey===";
string encryptioniv = GenerateSHA256String("myiv======").Substring(0, 16);
string str = aes_decrypt("2XJxQXSbPuJ9LMsZ/FESGw==", encryptionkey, encryptioniv);
Console.WriteLine(@str);
返回:HellO++++??????+
加密方法似乎也不起作用(在线引用并修改):
private static String EncryptIt(String s, string akey, string aIV)
{
String result;
byte[] key = Convert.FromBase64String(akey);
byte[] IV = Encoding.UTF8.GetBytes(aIV);
RijndaelManaged rijn = new RijndaelManaged();
rijn.Mode = CipherMode.CBC;
rijn.Padding = PaddingMode.PKCS7;
rijn.KeySize = 256;
rijn.BlockSize = 128;
using (MemoryStream msEncrypt = new MemoryStream())
{
using (ICryptoTransform encryptor = rijn.CreateEncryptor(key, IV))
{
using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
{
using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
{
swEncrypt.Write(s);
}
}
}
result = Convert.ToBase64String(msEncrypt.ToArray());
}
rijn.Clear();
return result;
}
调用此方法: EncryptIt("hello", encryptionkey, encryptioniv); 返回 ul0axDR0WWGcpeijPRNusg== 而不是由 PHP 生成的 2XJxQXSbPuJ9LMsZ/FESGw==。 有谁知道这里出了什么问题?
作为参考,我在 IV 中使用了这些方法,它们工作正常:
private string GenerateSHA256String(string inputString)
{
SHA256 sha256 = SHA256Managed.Create();
byte[] bytes = Encoding.UTF8.GetBytes(inputString);
byte[] hash = sha256.ComputeHash(bytes);
return GetStringFromHash(hash);
}
private string GetStringFromHash(byte[] hash)
{
StringBuilder result = new StringBuilder();
for (int i = 0; i < hash.Length; i++)
{
result.Append(hash[i].ToString("X2"));
}
return result.ToString();
}
老问题,但我最近又遇到了这个问题。
当使用 PHP 7.2 openssl_decrypt/openssl_encrypt 填充作为 OPENSSL_RAW_DATA 时,它仅在 chsarp AES 填充设置为 PaddingMode.PKCS7 时对我有用。
原始帖子有用于解密的 PaddingMode.None 和用于加密的 PaddingMode.PKCS7。
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