CODEWITHSUNDEEP
javaencryptionbouncycastle
lidermin
lidermin

Reputation: 2832

C# Encryption code ported to Java

I'm trying to convert the following code from C# to Java, but I get different result values of keys. Here are my codes:

C#:

        plainText = "Hello World";
        passPhrase = "IhDyHz6bgQyS0Ff1/1s=";
        saltValue = "0A0Qvv09OXd3GsYHVrA=";
        hashAlgorithm = "SHA1";
        passwordIterations = 3;
        initVector = "GjrlRZ6INgNckBqv";
        keySize = 256;

        byte[] initVectorBytes = Encoding.ASCII.GetBytes(initVector);
        byte[] saltValueBytes = Encoding.ASCII.GetBytes(saltValue);

        byte[] plainTextBytes = Encoding.UTF8.GetBytes(plainText);

        PasswordDeriveBytes password = new PasswordDeriveBytes(
                                                        passPhrase,
                                                        saltValueBytes,
                                                        hashAlgorithm,
                                                        passwordIterations);

        byte[] keyBytes = password.GetBytes(keySize / 8);

Java

        byte[] password = PassPhrase.getBytes("ASCII");
        byte[] salt = PKCS5S1ParametersGenerator.PKCS5PasswordToBytes(SaltValue.toCharArray());

        PKCS5S1ParametersGenerator generator = new PasswordDeriveBytes(new SHA1Digest()); 
        generator.init(password, salt, PasswordIterations); 

        byte[] key = ((KeyParameter)generator.generateDerivedParameters(32)).getKey();

The issue is that I get different keys even with the same parameters provided on both codes: (only the first 4 bytes match)

NOTE: this values had been converted to Base64:

C#: GWR/loJAuuiPvP0cuGGCVXErz16HjOZ7yQkCCHfBux4= Java: GWR/4oCT

If I keep playing with the number provided to generateDerivedParameters(32), it only gives me more bytes but still doesn't match the result at .Net.

I can't change the .Net code, so please any suggestion must be done at Java side.

Thanks in advance.

Upvotes: 0

Views: 1629

Answers (1)

kan
kan

Reputation: 28951

The generateDerivedParameters method says: "keySize the size of the key we want (in bits)". So you have to use generateDerivedParameters(32 * 8)

Upvotes: 1

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