All Questions
Tagged with cryptography hashcode
19
questions
19
votes
1
answer
32k
views
Self-contained SHA-256 implementation in C
I have been looking for a SHA-256 implementation in C with no dependencies (preferably self-contained in a single C-file) with a permissive license but found none to my liking.
Since the Wikipedia ...
- 719
16
votes
1
answer
18k
views
MD5 implementation in C++11
I'm writing a C++ implementation of the MD5 hashing algorithm based on the pseudocode of this wikipedia article.
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- 303
7
votes
2
answers
929
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
6
votes
1
answer
3k
views
Basic one way hash to store a password C#
I am storing a password in a database (school coursework so nothing too complicated but I want to challenge myself), I am using a one way hash function, is this suitable? It works I just feel there ...
- 163
5
votes
1
answer
3k
views
Login system using bcrypt and MySQL, to be used for any future projects
Main function will ask what the user wants to do. LoginSystem class will handle the sign up and login process as well with the checking if password is right. passwordHashing will use bcrpyt to salt ...
- 399
4
votes
2
answers
10k
views
Encrypting and decrypting passwords in PHP
I am wanting to encrypt a password and decrypt a password using PHP. Is this a safe method?
...
- 237
4
votes
2
answers
615
views
F# wrapper to generate SHA256 signature for a file
I've created the following module to allow me to generate a SHA256 signature for a file. (In real life this is used to verify an image file hasn't been amended). The cut down code looks like this:
<...
- 507
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;
...
- 125
4
votes
1
answer
267
views
Truncate 160-bit output from SHA-1 to 64-bit uint64_t
I'd like to truncate 160-bit output from SHA-1 to receive a (weaker) 64-bit digest.
It has been a while since I did the type of low-level C pointer arithmetic in the but-last line. Could you please ...
- 151
3
votes
3
answers
361
views
A hash-signature-type which tests on comparing against normal strings
I decided to throw this together today figuring it would be cool to add to my repertoire. Before we always had performed this "task" externally. Find the value we want to compare, hash it and compare ...
- 131
3
votes
2
answers
82
views
Finding a pair of words from two files with a particular MD5
I have two txt files. Both contain 60k+ words in a list. I put together some code to loop through each file and concatenate the strings
...
- 380
3
votes
1
answer
129
views
CliwPw - Yet Another Python3 Password Manager
I wrote a (very) simply Python3 password manager to familiarize myself with Sqlite3, and for fun. I am aware that there are already a variety of password managers out there, but I wanted something ...
- 161
2
votes
2
answers
164
views
Checking hash and passwords with a wordlist, more efficient
I have done a small code in which with a wordlist (out68.lst) I get the passwords from the hashes in the file 'shadow3'.
...
- 123
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
2
votes
1
answer
123
views
Custom code for MD5 in js [closed]
I wanted to write my own code for md5 in javascript and learn its inner mechanics. (I know it is not trusted anymore, deprecated, ... but I'm just learning).
I didn't want to just copy the code that ...
1
vote
3
answers
126
views
Sign a message with a Bitcoin private key
I am writing code in C, and I need to do various operations with Bitcoin, from generating key pairs, to sign messages to post transactions. I found libraries for C++, but nothing in C that does all ...
- 19
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
1
vote
1
answer
987
views
encrypt/decrypt person data
Ahead of the General Data Protection Regulation (GDPR) I begin to crypt more than ever before, in fact, all I can crypt become crypt.
However, I wonder if anybody can tell me if this code is secure ...
0
votes
2
answers
954
views
Encryption and Decryption in C
I have written a program in C, which encrypts and decrypts a c-styled string (const char *) and print the result to stdout. It ...
- 411