base64 encoded string: can be decoded in PHP but not Java?

Question

PHP code that works:

$str = "528ABf4cCU5g7zKzLC2t8oze4mstEcWKErar6FbTK2Xo97bu17S8cDmEg5HlbgcLtfvKCVvJ4FnRV3R1iX1TWZIyM7T2352wsb6LUyqFXA03Fz9G6dQmhRrkWpOXAoHeU/H63LKKzcJDhNb3YI2hfsU20BcT0qkk74XKneC7D91OKY="; echo strlen(base64_decode($str));

That outputs 130.

Java code that doesn't work:

String demo = "528ABf4cCU5g7zKzLC2t8oze4mstEcWKErar6FbTK2Xo97bu17S8cDmEg5HlbgcLtfvKCVvJ4FnRV3R1iX1TWZIyM7T2352wsb6LUyqFXA03Fz9G6dQmhRrkWpOXAoHeU/H63LKKzcJDhNb3YI2hfsU20BcT0qkk74XKneC7D91OKY="; System.out.println(java.util.Base64.getDecoder().decode(demo).length);

This throws:

"Input byte array has wrong 4-byte ending unit" java.lang.IllegalArgumentException.

How can I make the base64 encoded string that PHP likes decodable by Java?

dnault · Accepted Answer · 2021-01-14 18:16:21Z

That demo input is incorrectly padded; it should end in == instead of =.

You could use a more lenient decoder like Guava's BaseEncoding.

Alternatively, since padding is optional in Base64, you could just strip any trailing = characters before decoding with java.util.Base64.

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