Cryptography Questions

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How to hash a CAN message?

I want to hash a can message received from a vehicle. the following code written in python is used to receive the can
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ECDH private key size

I know that key sizes in ecdh depend on size of elliptic curve. if it is a 256-bit curve (secp256k1), keys will be:

Steam OpenID Signature Validation

I've been having this issue for a while now. i'm trying to add a sign in through steam button, which upon login, not only retrieves the user's id,
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Encrypt in PHP, decrypt in C

I'd like to encrypt a string in php and then decrypt it in c. i'm stuck on the decryption part. (php) i first encrypt the string:
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Zk-Snarks library in JavaScript

I am experimenting with zk-snarks and wanted to know if there was any library i can use in javascript. so far i have found out

Decrypt a 4-digit number

I just made a simple program in c that takes a 4-digit code and encrypts every digit (previously decomposed, that goes from 0 to 9) using this
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NodeJS Crypto equivalent in PHP?

I'm looking for a way to decrypt a file since a few weeks. but it's impossible to recover the file intact in php, only with node. but i would like

AES Key Generation from variables

I want to code a custom key generator in python. this key will be used as an input (along with the plain text) to aes algorithm for encryption (i
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