SHA256 Hashes in Go

Go: SHA256 Hashes

Go's crypto/sha256 package provides functionality for computing SHA256 hashes. SHA256 is a widely-used cryptographic hash function that produces a fixed-size 256-bit hash value from an arbitrary input.

How to compute the SHA256 hash of a string in Go

Here's an example of how to compute the SHA256 hash of a string:

    package main

    import (
        "crypto/sha256"
        "fmt"
    )

    func main() {
        str := "hello world"
        hash := sha256.Sum256([]byte(str))
        fmt.Printf("%x\n", hash)
    }

In this example, the sha256.Sum256() function is used to compute the SHA256 hash of the string hello world. The function returns a fixed-size array of bytes representing the hash value. You can convert this byte array to a hexadecimal string using the %x format specifier in fmt.Printf().

Here are some other functions you can use for computing SHA256 hashes in Go:

• func New() hash.Hash: creates a new SHA256 hash object that can be used to compute the hash incrementally.
• func (d *Digest) Reset(): resets the SHA256 hash to its initial state.
• func (d *Digest) Write(p []byte) (n int, err error): writes data to the SHA256 hash and returns the number of bytes written.
• func (d *Digest) Sum(in []byte) ([]byte): adds the current hash to in and returns the resulting slice.

Note that cryptographic hashes are one-way functions, which means it is computationally infeasible to recover the original input from the hash value.