C# AES-256 加密

发布于 2024-07-25 21:52:03 字数 2573 浏览 8 评论 0原文

我正在使用 RijndaelManaged 制作一个简单的加密/解密实用程序。 这工作正常,但我试图将其与在 Unix (Oracle) 中创建的另一个程序集成。 我的问题是,对于所有较小的输入字符串,我得到与生成 Unix 代码完全相同的加密十六进制,但对于较长的字符串,我的加密十六进制的一半是相同的,但另一半是不同的:

Unix 输出:

012345678901234 - 00984BBED076541E051A239C02D97117 
0123456789012345678 - A0ACE158AD8CF70CEAE8F76AA27F62A30EA409ECE2F7FF84F1A9AF50817FC0C4

Windows 输出(我的代码):

012345678901234 - 00984BBED076541E051A239C02D97117 (same as above)
0123456789012345678 - A0ACE158AD8CF70CEAE8F76AA27F62A3D9A1B396A614DA2C1281AA1F48BC3EBB (half exactly same as above)

我的 Windows 代码是:

public string Encrypt(byte[] PlainTextBytes, byte[] KeyBytes, string InitialVector)
        {
            byte[] InitialVectorBytes = Encoding.ASCII.GetBytes(InitialVector);
            RijndaelManaged SymmetricKey = new RijndaelManaged();
            SymmetricKey.Mode = CipherMode.ECB;
            SymmetricKey.Padding = PaddingMode.PKCS7;
            ICryptoTransform Encryptor = SymmetricKey.CreateEncryptor(KeyBytes, InitialVectorBytes);
            MemoryStream MemStream = new MemoryStream();
            CryptoStream CryptoStream = new CryptoStream(MemStream, Encryptor, CryptoStreamMode.Write);
            CryptoStream.Write(PlainTextBytes, 0, PlainTextBytes.Length);
            CryptoStream.FlushFinalBlock();
            byte[] CipherTextBytes = MemStream.ToArray();
            MemStream.Close();
            CryptoStream.Close();
            return ByteToHexConversion(CipherTextBytes);
        }

Unix (PL/SQL) 代码:

FUNCTION Encrypt_Card (plain_card_id  VARCHAR2)
    RETURN RAW AS
        num_key_bytes      NUMBER := 256/8;        -- key length 256 bits (32 bytes)
        encrypted_raw      RAW (2000);             -- stores encrypted binary text
        encryption_type    PLS_INTEGER :=          -- total encryption type
                        DBMS_CRYPTO.ENCRYPT_AES256
                      + DBMS_CRYPTO.CHAIN_CBC
                      + DBMS_CRYPTO.PAD_PKCS5;

        key_bytes_raw  RAW(64) :=my_hex_key;
    BEGIN



     encrypted_raw := DBMS_CRYPTO.ENCRYPT
           (
              src => UTL_I18N.STRING_TO_RAW (plain_card_id, 'AL32UTF8'),
              typ => encryption_type,
              key => key_bytes_raw
           );


      RETURN encrypted_raw;
    EXCEPTION
    WHEN OTHERS THEN
    dbms_output.put_line (plain_card_id || ' - ' || SUBSTR(SQLERRM,1,100) );
    RETURN HEXTORAW ('EEEEEE');

我看到的唯一区别是使用 PKCS5 和 PCKS7。 但是,.NET 没有 PCKS5。

I am using RijndaelManaged to make a simple encryption/decryption utility. This is working fine, but I am trying to get it integrated with another program which is created in Unix (Oracle). My problem is, for all smaller input string, i am getting the exact same encrypted hex as the Unix code is generation, but for longer strings, half of my encrypted hex is same, but the other half is different:

Unix Output:

012345678901234 - 00984BBED076541E051A239C02D97117 
0123456789012345678 - A0ACE158AD8CF70CEAE8F76AA27F62A30EA409ECE2F7FF84F1A9AF50817FC0C4

Windows Output (my code):

012345678901234 - 00984BBED076541E051A239C02D97117 (same as above)
0123456789012345678 - A0ACE158AD8CF70CEAE8F76AA27F62A3D9A1B396A614DA2C1281AA1F48BC3EBB (half exactly same as above)

My Windows code is:

public string Encrypt(byte[] PlainTextBytes, byte[] KeyBytes, string InitialVector)
        {
            byte[] InitialVectorBytes = Encoding.ASCII.GetBytes(InitialVector);
            RijndaelManaged SymmetricKey = new RijndaelManaged();
            SymmetricKey.Mode = CipherMode.ECB;
            SymmetricKey.Padding = PaddingMode.PKCS7;
            ICryptoTransform Encryptor = SymmetricKey.CreateEncryptor(KeyBytes, InitialVectorBytes);
            MemoryStream MemStream = new MemoryStream();
            CryptoStream CryptoStream = new CryptoStream(MemStream, Encryptor, CryptoStreamMode.Write);
            CryptoStream.Write(PlainTextBytes, 0, PlainTextBytes.Length);
            CryptoStream.FlushFinalBlock();
            byte[] CipherTextBytes = MemStream.ToArray();
            MemStream.Close();
            CryptoStream.Close();
            return ByteToHexConversion(CipherTextBytes);
        }

Unix (PL/SQL) code:

FUNCTION Encrypt_Card (plain_card_id  VARCHAR2)
    RETURN RAW AS
        num_key_bytes      NUMBER := 256/8;        -- key length 256 bits (32 bytes)
        encrypted_raw      RAW (2000);             -- stores encrypted binary text
        encryption_type    PLS_INTEGER :=          -- total encryption type
                        DBMS_CRYPTO.ENCRYPT_AES256
                      + DBMS_CRYPTO.CHAIN_CBC
                      + DBMS_CRYPTO.PAD_PKCS5;

        key_bytes_raw  RAW(64) :=my_hex_key;
    BEGIN



     encrypted_raw := DBMS_CRYPTO.ENCRYPT
           (
              src => UTL_I18N.STRING_TO_RAW (plain_card_id, 'AL32UTF8'),
              typ => encryption_type,
              key => key_bytes_raw
           );


      RETURN encrypted_raw;
    EXCEPTION
    WHEN OTHERS THEN
    dbms_output.put_line (plain_card_id || ' - ' || SUBSTR(SQLERRM,1,100) );
    RETURN HEXTORAW ('EEEEEE');

The only difference i see is use of PKCS5 and PCKS7. But, .NET doesn't have PCKS5.

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评论(2

音栖息无 2024-08-01 21:52:04

在一种情况下使用 ECB,在另一种情况下使用 CBC。

You use ECB in one case and CBC in the other case.

此岸叶落 2024-08-01 21:52:03

abc 所说的,而且您的 PL/SQL 代码中似乎根本没有任何 IV(初始化向量)。

第一部分相同的事实与不同的模式(ECB 和 CBC)有关。 ECB 单独加密每个块,而 CBC 在加密下一个块时使用前一个块。

这里发生的情况是,由于您使用 CBC 并且没有设置 IV,因此 IV 全部为零。
这意味着 ECB 加密和 CBC 加密的第一个块将是相同的。
(因为 A XOR 0 = A)。

您需要确保在两个系统中使用相同的加密模式,如果您决定使用 CBC,请确保使用相同的 IV。

What abc said and also you don't seem to have any IV (Initialization Vector) in you PL/SQL code at all.

The fact that the first part are the same has to do with the different modes (ECB and CBC). ECB encrypts each block separately while CBC uses the previous block when encrypting the next one.

What happens here is that since you use CBC and do not set an IV the IV is all zeroes.
That means that the first block of ECB encryption and CBC encryption will be the same.
(Since A XOR 0 = A).

You need to make sure you use the same encryption mode in both systems and if you decide on CBC make sure you use the same IV.

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