在 Windows Phone 上进行加密

Doing cryptography on Windows Phone

我编写了一些代码,允许我在 C# 中进行加密 - 主要使用 System.Security.Cryptography 中的 AesManaged()SHA256Managed()

用例是该工具需要能够提取一段加密的数据,对其进行解密,将其显示给用户,允许再次编辑和加密,然后再将其发回。

我希望能够在 Windows Phone 上做类似的事情,但似乎 phone.

上的命名空间不可用

那么我现在有什么选择?它会在 Windows Phone 10 上可用吗?似乎在 phone 应用程序中进行加密是一项相对常见的任务?

编辑:添加了关于应用应该做什么的信息

你想用密码学做什么? 因为如果您只需要存储一些用户凭据,最好的方法是使用 PasswordVault

此处参考 MSDN https://msdn.microsoft.com/en-us/library/windows/apps/xaml/windows.security.credentials.passwordvault.aspx

我在这里做了一个例子 http://depblog.weblogs.us/2014/11/20/migrating-from-sl8-0-protectdata-to-rt8-1-passwordvault/

添加了一些关于如何在 Vault 中添加和删除条目的示例代码(博客上有更多详细信息 post)

public async Task AddAccount(Account accountToAdd)
{
    //Reinitialize the vault to see if the given account is already available
    await this.InitializeSettingsService();
    Account accountFromVault = this.Accounts.FirstOrDefault(item => item.UserName.Equals(accountToAdd.UserName, StringComparison.OrdinalIgnoreCase));

    if(accountFromVault == null)
        _vault.Add(new PasswordCredential(Constants.VAULTRESOURCENAME, accountToAdd.UserName, accountToAdd.Password));

    if (accountFromVault != null && !accountFromVault.Password.Equals(accountToAdd.Password, StringComparison.Ordinal))
    {
        _vault.Remove(new PasswordCredential(Constants.VAULTRESOURCENAME, accountFromVault.UserName, accountFromVault.Password));
        _vault.Add(new PasswordCredential(Constants.VAULTRESOURCENAME, accountToAdd.UserName, accountToAdd.Password));
    }

    Account accountFromMemory = this.Accounts.FirstOrDefault(item => item.UserName.Equals(accountToAdd.UserName, StringComparison.OrdinalIgnoreCase));
    if (accountFromMemory != null)
    {
        if (!accountFromMemory.Password.Equals(accountToAdd.Password, StringComparison.OrdinalIgnoreCase))
        {
            this.Accounts.Remove(accountFromMemory);
            this.Accounts.Add(accountToAdd);
        }
    }
    else
        this.Accounts.Add(accountToAdd);
}

public async Task RemoveAccount(Account accountToRemove)
{
    //Reinitialize the vault to see if the given account is already available
    await this.InitializeSettingsService();
    Account accountFromVault = this.Accounts.FirstOrDefault(item => item.UserName.Equals(accountToRemove.UserName, StringComparison.OrdinalIgnoreCase));

    if (accountFromVault != null)
        _vault.Remove(new PasswordCredential(Constants.VAULTRESOURCENAME, accountToRemove.UserName, accountToRemove.Password));

    Account accountFromMemory = this.Accounts.FirstOrDefault(item => item.UserName.Equals(accountToRemove.UserName, StringComparison.OrdinalIgnoreCase));
    if (accountFromMemory != null)
        this.Accounts.Remove(accountFromMemory);
}

如@WDS 所述,用于加密的工具位于 Windows.Security.Cryptography 命名空间中 - 在 #WP8 上可用。

所以我重写了我的散列实现,如下所示:

public IBuffer ComputeHash(string value)
{
    IBuffer buffUtf8Msg = CryptographicBuffer.ConvertStringToBinary(value, BinaryStringEncoding.Utf8);
    var objAlgProv = HashAlgorithmProvider.OpenAlgorithm("SHA256");
    var strAlgNameUsed = objAlgProv.AlgorithmName;

    var buffHash = objAlgProv.HashData(buffUtf8Msg);

    if (buffHash.Length != objAlgProv.HashLength)
    {
        throw new Exception("There was an error creating the hash");
    }

    return buffHash;
}

可以在这里找到如何进行加密和解密的示例:

https://msdn.microsoft.com/en-us/library/windows/apps/windows.security.cryptography.core.cryptographicengine.aspx