All Questions
29 questions
0
votes
3
answers
222
views
Hash function based on ISBN
I'm trying to create a hash function for my own custom class. It uses a string value of 4 chars as a key, which is unique to every object, which I then encode using getBytes(), the part actually used ...
1
vote
1
answer
108
views
A simple Java integer integer hash set - follow-up 2
(See the previous version.)
Now I have this:
com.github.coderodde.util.IntHashSet:
...
- 31.3k
6
votes
4
answers
1k
views
A simple Java integer hash set
(See the next version.)
The following data structure implements a hash table based set for int values:
...
- 31.3k
4
votes
1
answer
219
views
Securely hash passwords
Since hashing algorithms isn't something to mess around with as a beginner. Several howto's explain that one should use already made solutions.
Examples of such pages:
https://crackstation.net/hashing-...
- 143
3
votes
1
answer
200
views
Hashing array of strings as Merkle tree in one function
I want to hash an array of strings into one hash as shown on scheme on the image below. But I do not want to implement some class based Merkle tree. It's just a simple function. Is this a good ...
- 131
7
votes
2
answers
962
views
Finding collisions of the first few bits of a SHA-1 hash
My objective is to find a hash collision of my modified hash function. Assuming my modified hash only outputs the first 36 bits of SHA-1. As we know, SHA-1 is a 160-bit hash value, hence, we only need ...
- 73
0
votes
1
answer
135
views
HashMap Implemention in Java
I just finished implementing a HashMap in Java, with methods:
add(String key, Integer value)
get(String key)
...
- 101
2
votes
1
answer
1k
views
Using Java to implement a hash table (dictionary) with only arrays
I'm new to hash codes/hash tables, so I'm very unsure of my implementation. I want to create a hash table, but I can only use arrays. Specifically, I want to be able to insert things like a dictionary ...
- 21
0
votes
1
answer
1k
views
Reading bytes from file to compute its SHA256 hash
I need to get text hash (sha 256), so I need to convert file to its type representation. Is this a fast way to get a byte representation of a file?
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- 11
4
votes
2
answers
2k
views
Simple hashing and salting algorithm
I have devised what I feel to be a simple hash/salting algo for Java, and am looking for some feedback from people more skilled than myself. Please find below my code;
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- 135
1
vote
1
answer
564
views
Implementing feature hashing using guava
I am trying to implement feature hashing in Java. For this I am trying to use Hashing functions from guava.
This is how I am doing it now:
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- 149
4
votes
1
answer
481
views
Generating Signatures of Tree Structures using an Order-Independent Hash
I'm working with a file format which stores data as a tree. Each node in the tree is known as a Tag, and every tag has a name ...
- 143
1
vote
4
answers
3k
views
Java class to compute and get a MD5 hash as a string
Here is my class file to compute MD5 hashes on a file. I wanted to be able to easily calculate them without having to create a lot of overhead in the code using the class.
Can anyone tell me a list ...
- 113
2
votes
3
answers
7k
views
String hash generator
There is a lot of code duplication because it generates hashes using multiple cryptographic hash algorithms.
How can I improve this code?
...
- 53
3
votes
4
answers
2k
views
Optimizing Java SHA-512 String-to-Hash Generator
In an attempt to learn Java and SHA-2 I created a very simple String-to-SHA512 generator. Here is the code:
...
- 31