問題描述
根據(jù)我的閱讀，我不確定 AES 是一種可以使用不同長度密鑰的單一標(biāo)準(zhǔn)化算法，還是一系列類似算法?我的意思是，如果我發(fā)現(xiàn)任何 2 個采用 128 位密鑰的 AES 實現(xiàn)，我是否應(yīng)該確信它們會以相同的方式工作(排除錯誤)?
From my reading I am not sure if AES is a single, standardized algorithm that can work with different length keys, or a family of similar algorithms? What I mean is if I find any 2 AES implementations taking a 128-bit key, should I be confident they will work identically (barring bugs)?
特別是在.Net/C#中，我很困惑為什么抽象基類System.Security.Cryptography.Aes有兩種實現(xiàn):System.Security.Cryptography.AesCryptoServiceProvider &System.Security.Cryptography.AesManaged.
Specifically in .Net/C#, I was confused why there are two implementations of abstract base class System.Security.Cryptography.Aes: System.Security.Cryptography.AesCryptoServiceProvider & System.Security.Cryptography.AesManaged.
然后似乎 AES 和 Rijndael 之間存在區(qū)別/重疊，.NET 有 Rijndael 和 RijndaelManaged 類，以及 RijndaelManagedTransform
Then there seems to be distinction/overlap between AES and Rijndael, .NET has Rijndael and RijndaelManaged classes, as well as RijndaelManagedTransform
所有這些之間有什么區(qū)別?我注意到 AES 類似乎只存在于 .NET 3.5 之后，而 Rijndael 從 1.0 開始就存在
What's the differences between all of these? I notice AES classes seem to only exist since .NET 3.5 whereas Rijndael has been around since 1.0
對不起，如果這些是愚蠢的問題，我是加密的新手，而不是安全散列函數(shù).
Sorry if these are dumb questions, I'm new to crypto other than secure hashing functions.
推薦答案
AES，高級加密標(biāo)準(zhǔn)，定義在 FIPS PUB 197 三種對稱分組密碼:AES-128、AES-192 和 AES-256.所有三種算法都由 Rijndael 算法的特定參數(shù)選擇定義.
AES, the Advanced Encryption Standard, defines in FIPS PUB 197 three symmetric block-ciphers: AES-128, AES-192 and AES-256. All three algorithms are defined by specific parameter-choices for the Rijndael algorithm.
AES-128-encryption 是一個函數(shù)(密鑰、數(shù)據(jù))->(加密).Rijndael-encryption 是一個函數(shù) (key, data, block-size, key-size) -> (encryption).
AES-128-encryption is a function (key, data) -> (encryption). Rijndael-encryption is a function (key, data, block-size, key-size) -> (encryption).
AesCryptoServiceProvider 使用底層 Windows CryptoAPI 來執(zhí)行加密.AesManaged 在純托管代碼中執(zhí)行加密.RijndaelManaged 支持所有參數(shù)選擇(在純托管代碼中也是如此).
AesCryptoServiceProvider uses the underlying Windows CryptoAPI to perform the encryption.
AesManaged performs the encryption in pure managed code. RijndaelManaged supports the full range of parameter-choices (also in pure managed code).
使用 AesCryptoServiceProvider 的優(yōu)勢包括提高速度的潛力以及 CryptoAPI 已通過 FIPS 認(rèn)證(在某些版本的 Windows 上).
Advantages to using AesCryptoServiceProvider include potential for higher speed and the fact that CryptoAPI is FIPS certified (on certain versions of Windows).
AesManaged 的優(yōu)點包括可移植性(并非所有版本的 Windows 都支持 AesCryptoServiceProvider).
Advantages to AesManaged include portability (AesCryptoServiceProvider is not supported on all versions of Windows).
RijndaelManaged 的唯一優(yōu)勢是它在 .NET 框架的早期版本中受支持 - 我從未見過有人使用非 AES 參數(shù)選擇.
The only advantage to RijndaelManaged is that it is supported in early versions of the .NET framework - I haven't ever seen anyone use the non-AES parameter-choices.
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