Crypto nodejs sha256

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Unidirectional: A good hash algorithm is easy to apply, but hard to undo. This means that, given a hash, there isn't any reasonable way to find out what the original piece of data was. If you have a new enough version of OpenSSL, you can get a list of hash types your OpenSSL supports by typing openssl list-message-digest-algorithms into the command line. For older versions, simply type openssl list-message-digest-commands instead! One of the most common hash algorithms is SHA Its only argument is a string representing the hash.

The argument for digest represents the output format, and may either be "binary", "hex" or "base64". It defaults to binary. Its use is similar to that of a vanilla hash, but also allows to check the authenticity of data as well as the integrity of said data as you can using SHA checksums. The API for hmacs is very similar to that of createHash, except that the method is called createHmac and it takes a key as a second argument: require 'crypto'. Ciphers Ciphers allow you to encode and decode messages given a password.

You can get a list of hash types your OpenSSL supports by typing openssl list-cipher-commands into the command line for older versions, or openssl list-cipher-algorithms for newer versions of OpenSSL. They also both have analogous update functions. Moreover, after encoding or decoding your data, you will likely have to call the final method to get the last chunk of encoded information.

Another important addition in the cipher method is of the iv or initialization vector. Initialization vectors should be unpredictable and unique, typically required to be random or pseudorandom. Keep this key as strong as possible and save it in environment variable. As a good security practice periodically change this key. This is because some node versions do not come shipped with this module.

In that case you can install it using npm. SHA is a strong crypto protocol which cannot be decoded. Can use it as object ids for uniqueness. Same strings for a secret key will always generate the same hash. So it is used to check strings equality. For example, when a user registers on a website they provide a password in plain text.