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. There are two problems with what you've tried to do above: SHA-256 is a 256 bit (32 bytes) hashing algorithm which can calculate. That's a lot of words, so let's walk through it. Decrypt Hash Hash Toolkit Hash Decrypter enables you to decrypt reverse a hash in. This means you need to take the original string, calculate the SHA256 hash of it, then Base64-URL-encode the hash. Hashes are often used to store passwords. The PKCE code challenge is the Base64-URL-encoded SHA256 hash of the verifier. Hash Toolkit Hash Decrypter enables you to decrypt / reverse a hash in various formats into their original text. Type string that you need to encode with algorithm according to next schema: For example to visit page that contains hash of 'hello world' you can just visit url: The another cool thing is that you can specify 'json' or 'plain' mode into URL and you will get only HASH in response. 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. It also publishes hashes for all of the 4,294,967,296 addresses in the IPv4 address space. I think that sha256 is actually the best replacement because of its good balance between online storage size and security. This project aims to provide an easy tool for reversing a hashed IP address back to its original form (currently supports MD5, SHA1, and SHA256 hashes within the IP range 10.0.0.0/8). It seems that sha256 is becoming more and more used in order to replace the old md5 hash function. What am I doing wrong to not get the expected value? This algorithm takes as input a 264 maximum length message, and outputs a 256 bits hash. Using this SHA256 hash calculator and Base64 Encoder, I got ODg1ZmZiYTZiNTFlMjdhYWViZGUzMzA2ZGNiOWExNWI3NDc1NzE5ZDllNzE5NmFmMTZhNGI0OGVkNmZhYjczYQ which doesn't match the expected value of iF_7prUeJ6rr3jMG3LmhW3R1cZ2ecZavFqS0jtb6tzo. IF_7prUeJ6rr3jMG3LmhW3R1cZ2ecZavFqS0jtb6tzo as the code challenge? Using Zg6klgrnixQJ629GsawRMV8MjWvwRAr-vyvP1MHnB6X8WKZN as the code verifier, how did they produce ![]() What you want to do with a hash function is to find collisions - two messages with different meanings, that have the same hash value. Typically, you would know all of the input value, not just part of it. The following example shows the result of using SHA-256 to hash the example canonical request.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. Answer (1 of 7): The purpose of a hash function is not to encrypt or conceal the data. ![]() The description is: this one: The hashed canonical request must be represented as a string of lowercase hexadecimal characters.
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