How to implement a hash algorithm in Golang?

2 years ago
William Carter
1 minute

In Go language, the crypto package can be used to implement hash algorithms. The crypto package offers implementations of various hash algorithms, such as MD5, SHA-1, and SHA-256.

Below is an example of computing a hash value using the SHA-256 algorithm.

package main

import (
	"crypto/sha256"
	"fmt"
)

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

The output result is:

Hash value: 2ef7bde608ce5404e97d5f042f95f89f1c232871

In this example, the string is first converted to a byte array using []byte, then the hash value is calculated using the sha256.Sum256() function. Finally, the hash value is output using the %x formatting string.

Different hash algorithms can be selected as needed, for example using the crypto/md5 package to calculate the MD5 hash value. Just replace sha256 with md5 in the example above.

It is important to note that the hash algorithm will convert input of any length into a fixed length hash value, so the length of the hash value will remain constant regardless of the length of the input data.

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