How to use PBKDF2 in java to get the same result as c#?

Question

I want to convert my c# codes to java with PBKDF2 hashing and with the same result(no real product, just test).

C#:

static string Pbkdf2Hashing(string password)
    {
        byte[] salt = new byte[128 / 8];
        string hashed = Convert.ToBase64String(KeyDerivation.Pbkdf2(
            password: password,
            salt: salt,
            prf: KeyDerivationPrf.HMACSHA1,
            iterationCount: 10000,
            numBytesRequested: 256 / 8));
        return hashed;
    }

The result:

List item

oudaCubzWVIMjTxaQh1KT85fn+p2KjQRdBDXpiS8AUA=

Java:

 static String Pbkdf2Hashing(String password) throws Exception {
    byte[] salt = new byte[128 / 8];
    int iterations = 10000;
    int derivedKeyLength = 256;
    KeySpec spec = new PBEKeySpec(password.toCharArray(), salt, iterations, derivedKeyLength);
    SecretKeyFactory f = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
    byte[] result = f.generateSecret(spec).getEncoded();
    return Base64.getEncoder().encodeToString(result);
}

The result:

dxtD2eQ/4Sj5pGnPqCTiuL6jns5apO1OHkTaJC9DTzw=

Topaco · Accepted Answer · 2020-08-28 12:24:11Z

2

So that the Java code gives the same result as the C# code, simply replace PBKDF2WithHmacSHA256 with PBKDF2WithHmacSHA1 in the Java code.

Since you didn't post the plaintext to your example, I use for my test the plaintext

The quick brown fox jumps over the lazy dog

for which the C# Code and the fixed Java Code both return

mPfEIpaydCQU15ACyPW+jPh/ctqi8q74aWhO9nWz9Q0=

as result.

answered Aug 28, 2020 at 12:24

Topaco

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