Alternative Java Methods for Encoding String to Base64

Question

In C#, I can pass a string to Convert.FromBase64String(String string), which returns a byte[]. Take, for example, the following code:

string key = "lRixPxNRmNOTxB2npoa5zCZR2I/GkuCndWtcRS/w4CI=";
byte[] KeyBytes = Convert.FromBase64String(key);
Console.WriteLine(KeyBytes.Length); //output 32

If I try the same thing in java using the java.util.Base64 library, it looks something like this:

String key = "lRixPxNRmNOTxB2npoa5zCZR2I/GkuCndWtcRS/w4CI=";
byte[] base64KeyBytes = Base64.getEncoder().encode(key.getBytes(UTF_8));
System.out.println(base64KeyBytes.length); //output 60

The Java encode method requires a type byte[] for the argument, and I think this is what my problem stems from.

Is there anyway a way in Java to produce the same output that I'm getting in C#?

Maybe .net version uses platform default encoding that is different than utf-8 such as iso-8859. — tsolakp
– tsolakp, Commented Dec 21, 2017 at 23:40

Tommaso Belluzzo · Accepted Answer · 2017-12-21 23:49:03Z

1

The method Convert.FromBase64String in .NET is used for decoding base64-encoded strings back to plain text. And this is correct since your key string is base64-encoded.

In your Java code excerpt, on the opposite, you are attempting to encode your already-base64-encoded string using the encode method... when you should instead decode it. In order to do it, use the following code:

String key = "lRixPxNRmNOTxB2npoa5zCZR2I/GkuCndWtcRS/w4CI=";
byte[] base64KeyBytes = Base64.getDecoder().decode(key);
System.out.println(base64KeyBytes.length); // 32

You can alternatively use android.util.base64 as follows:

String key = "lRixPxNRmNOTxB2npoa5zCZR2I/GkuCndWtcRS/w4CI=";
byte[] base64KeyBytes = Base64.decode(key, Base64.DEFAULT);
System.out.println(base64KeyBytes.length); // 32

edited Dec 21, 2017 at 23:49

answered Dec 21, 2017 at 23:42

Tommaso Belluzzo

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Comments

johnII · Accepted Answer · 2017-12-21 23:41:59Z

0

It should be decode not encode

  String key = "lRixPxNRmNOTxB2npoa5zCZR2I/GkuCndWtcRS/w4CI=";
  byte[] base64KeyBytes  = Base64.getDecoder().decode(key);
  System.out.println(base64KeyBytes .length); //output 32

answered Dec 21, 2017 at 23:41

johnII

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