Golang function hash, crc32, md5 and sha1 calculation methods

Golang is a new high-performance programming language with a rich standard library and built-in functions. These include hash functions, which can be used to generate hash values ​​of data for file verification, data verification, etc. This article will introduce the calculation methods and applications of the commonly used functions hash, crc32, md5 and sha1 in Golang.

1. Hash function

Golang’s hash function includes a variety of hash algorithms, such as SHA-1, MD5, SHA-224, SHA-256, SHA-384 and SHA-512 wait. Different hashing algorithms have different characteristics and application scenarios.

1. SHA-1

SHA-1 is a secure hash algorithm that can convert data of any length into a fixed-length hash value. The calculation method of the SHA-1 hash function is as follows:

import "crypto/sha1"

func main() {
    data := []byte("hello, world!")
    sha := sha1.Sum(data)
    shaStr := fmt.Sprintf("%x", sha)
    fmt.Println("SHA-1 of the data is:", shaStr)
}

Among them, the sha1.Sum() function can calculate the SHA-1 hash value, and the return value type is a byte array with a length of 20. Since hash values ​​are usually represented as hexadecimal strings, you can use the fmt.Sprintf() function to convert the byte array to a hexadecimal string.

2, MD5

MD5 is a commonly used hash algorithm that converts data of any length into a 128-bit hash value. The calculation method of the MD5 hash function is as follows:

import "crypto/md5"

func main() {
    data := []byte("hello, world!")
    md := md5.Sum(data)
    mdStr := fmt.Sprintf("%x", md)
    fmt.Println("MD5 of the data is:", mdStr)
}

Among them, the md5.Sum() function can calculate the MD5 hash value, and the return value type is a byte array with a length of 16. Similarly, you also need to use the fmt.Sprintf() function to convert the byte array into a hexadecimal string.

3. SHA-256

SHA-256 is a secure hash algorithm that converts data of any length into a 256-bit hash value. The calculation method of the SHA-256 hash function is as follows:

import "crypto/sha256"

func main() {
    data := []byte("hello, world!")
    sha := sha256.Sum256(data)
    shaStr := fmt.Sprintf("%x", sha)
    fmt.Println("SHA-256 of the data is:", shaStr)
}

Among them, the sha256.Sum256() function can calculate the SHA-256 hash value, and the return value type is a byte array with a length of 32. Similarly, you also need to use the fmt.Sprintf() function to convert the byte array into a hexadecimal string.

2. crc32 function

CRC32 is a commonly used cyclic redundancy check algorithm that can be used to check the consistency and integrity of data transmission. Golang's crc32 function supports multiple CRC32 algorithms, such as IEEE, Castagnoli, Koopman, etc.

import "hash/crc32"

func main() {
    data := []byte("hello, world!")
    crc := crc32.ChecksumIEEE(data)
    fmt.Println("CRC32 of the data is:", crc)
}

Among them, the crc32.ChecksumIEEE() function can calculate the CRC32 value of the IEEE algorithm, and the return value type is uint32.

3. Summary

This article introduces the calculation methods of hash functions and crc32 functions commonly used in Golang, including algorithms such as SHA-1, MD5, SHA-256 and IEEE CRC32. These functions can be used for integrity verification of data transmission, file verification, etc., and are one of the commonly used tools in Golang programming.

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