Question

我想用密码加密和解密字符串。我使用C＃和WinRT（MetroStyle）。有人加密/解密吗？

Answer 1

Metro中不存在正常的.Net System.Security.Cryptography命名空间。您可以使用CryptographicEngine命名空间中的Windows.Security.Cryptography.Core类来代替。

如果仅验证/验证密码，请不要对其进行加密。相反，请使用以下内容：

using Windows.Security.Cryptography.Core;
using Windows.Security.Cryptography;
using Windows.Storage.Streams;

...
// Use Password Based Key Derivation Function 2 (PBKDF2 or RFC2898)
KeyDerivationAlgorithmProvider pbkdf2 = 
    KeyDerivationAlgorithmProvider.OpenAlgorithm(
        KeyDerivationAlgorithmNames.Pbkdf2Sha256);

// Do not store passwords in strings if you can avoid them. The
// password may be retained in memory until it is garbage collected.
// Crashing the application and looking at the memory dump may 
// reveal it.
IBuffer passwordBuffer = 
     CryptographicBuffer.ConvertStringToBinary("password", 
         BinaryStringEncoding.Utf8);
CryptographicKey key = pbkdf2.CreateKey(passwordBuffer);

// Use random salt and 10,000 iterations. Store the salt along with 
// the derviedBytes (see below).
IBuffer salt = CryptographicBuffer.GenerateRandom(32);
KeyDerivationParameters parameters = 
    KeyDerivationParameters.BuildForPbkdf2(salt, 10000);

// Store the returned 32 bytes along with the salt for later verification
byte[] derviedBytes = 
    CryptographicEngine.DeriveKeyMaterial(key, parameters, 32).ToArray();

提供密码时，使用相同的salt运行相同的进程并比较derivedBytes。像加密密钥一样存储密码。

如果使用密码，例如连接到其他服务：

// Use AES, CBC mode with PKCS#7 padding (good default choice)
SymmetricKeyAlgorithmProvider aesCbcPkcs7 = 
    SymmetricKeyAlgorithmProvider.OpenAlgorithm(SymmetricAlgorithmNames.AesCbcPkcs7);

// Create an AES 128-bit (16 byte) key
CryptographicKey key = 
    aesCbcPkcs7.CreateSymmetricKey(CryptographicBuffer.GenerateRandom(16));

// Creata a 16 byte initialization vector
IBuffer iv = CryptographicBuffer.GenerateRandom(aesCbcPkcs7.BlockLength);

// Encrypt the data
byte[] plainText = Encoding.UTF8.GetBytes("Hello, world!"); // Data to encrypt
byte[] cipherText = CryptographicEngine.Encrypt(
    key, plainText.AsBuffer(), iv).ToArray();

// Decrypt the data
string newPlainText = new string(
    Encoding.UTF8.GetChars(CryptographicEngine.Decrypt(
        key, cipherText.AsBuffer(), iv).ToArray()));

// newPlainText contains "Hello, world!"

与任何加密一样，请务必妥善保护您的密钥并遵循最佳做法。链接文档还提供了示例。

字符串使用密码c＃Metro Style加密/解密

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