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?
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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