How do I calculate the MD5 checksum of a file in Python?

In regards to your error and what’s missing in your code. m is a name which is not defined for getmd5() function. No offence, I know you are a beginner, but your code is all over the place. Let’s look at your issues one by one 🙂 First, you are not using hashlib.md5.hexdigest() method correctly. Please refer explanation on hashlib functions … Read more

What kind of Java type is “[B”?

That my friend is an array of bytes. In JNI, [B is used to describe an array ([) of bytes (B). An array of ints is [I etc. You can get a bit more information on field descriptors here:JNI Types and Data Structures (Table 3-2 should be what you are looking for).

Is it possible to decrypt MD5 hashes?

No. MD5 is not encryption (though it may be used as part of some encryption algorithms), it is a one way hash function. Much of the original data is actually “lost” as part of the transformation. Think about this: An MD5 is always 128 bits long. That means that there are 2128 possible MD5 hashes. … Read more