So, to calculate the PKCE code challenge, you need to use a SHA256 function that can give you the raw bytes, then use a modified Base64 encoding function to encode those bytes. This makes it URL-safe, since otherwise the +/= characters would need to be escaped in the URL. Base64-URL-encoding is a minor variation of Base64 encoding, where the only difference is using the character - instead of + and _ instead of /, and trimming the = padding characters from the end. ![]() The next problem is that you need to base64-url encode, not base64 encode. You need to use a hash function that outputs the raw bytes, and pass the raw bytes into the base64-url-encoder. So the next thing you're doing by base64 encoding is that you're base64 encoding the hex representation of the hash rather than the raw bytes. That's typically helpful, but in this case is not. The online SHA256 hash calculator you found outputs the hash as a hex-encoded string rather than the raw bytes. Multiple hashing algorithms are supported including MD5, SHA1, SHA2, CRC32 and many other algorithms. There are two problems with what you've tried to do above: Hash Calculator Online lets you calculate the cryptographic hash value of a string or file. That's a lot of words, so let's walk through it. This means you need to take the original string, calculate the SHA256 hash of it, then Base64-URL-encode the hash. The PKCE code challenge is the Base64-URL-encoded SHA256 hash of the verifier. What am I doing that's causing this discrepancy? How do I calculate the expected code_verifier value of iF_7prUeJ6rr3jMG3LmhW3R1cZ2ecZavFqS0jtb6tzo? Thanks Using this calculator I get iF/7prUeJ6rr3jMG3LmhW3R1cZ2ecZavFqS0jtb6tzo which is one character off from the expected value (notice how there's a / instead of _). This SHA256 base 64 hash calculator from approsto gives me a value that is very close to the expected value. What am I doing wrong to not get the expected value? Also, HashMyFiles displays an error message if you try to use this option while SHA256 is turned off, because VirusTotal doesnt support MD5 hashes anymore. Click on 'Start conversion' to calculate the SHA256 hash. Using this SHA256 hash calculator and Base64 Encoder, I got ODg1ZmZiYTZiNTFlMjdhYWViZGUzMzA2ZGNiOWExNWI3NDc1NzE5ZDllNzE5NmFmMTZhNGI0OGVkNmZhYjczYQ which doesn't match the expected value of iF_7prUeJ6rr3jMG3LmhW3R1cZ2ecZavFqS0jtb6tzo. How to calculate the SHA256 hash Select a file or copy and paste the text you want to hash. Step 3: Use Copy to Clipboard functionality to copy the generated. Step 2: Click on Generate SHA256 HASH Online. How to Generate SHA256 Hash Step 1: Enter the Plain or Cypher Text. SHA256 Generator can be called as SHA256 Checksum online or SHA256 Calculator. IF_7prUeJ6rr3jMG3LmhW3R1cZ2ecZavFqS0jtb6tzo as the code challenge? It will generate 64 characters of SHA256 hash string and it can not be reversible. Using Zg6klgrnixQJ629GsawRMV8MjWvwRAr-vyvP1MHnB6X8WKZN as the code verifier, how did they produce A second step required 570 CPU-years on an 8-year old IBM BlueGene/Q computer, a few weeks before it was scrapped.I'm going through Okta's PCKE Flow demo to get a better understanding of how it works, and I'm having trouble reproducing the same code_challenge hash that's being generated from the code_verifier. It required 7 calendar months using two obsolete second-hand bitcoin mining devices converted into “useful” computational devices. The actual computation was done on aging hardware. ![]() ![]() (If we humans cannot analyze some patterns, doesn't mean AI can't) In fact the AI thought just crossed my mind in this very moment. What if someone like entering previously hashed data as a learning/training set into an AI system for example? 10¹⁰ yrs still safe ofcourse, but I think the risk could come from analytical attacks too, Differential attacks I mean (I've always been impressed by their old S-boxes story with DES)Ĥ-I just found this paper today (while editing the answer) but I have no access to it's full version.10¹⁸ģ-The resulting number being down by ~10³ ie ~3.10³⁶Ģ-These numbers has changed from 2017 till now.When we divide by 365.25 it becomes ~10¹¹ yrs 10¹³ is on days, ie before dividing by 365.25. ![]() 1-There is a slight divide mistake in the given answer.
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