Golang哈希算法实战与数据校验技巧

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

h := sha256.New()
h.Write([]byte("part1"))
h.Write([]byte("part2"))
sum := h.Sum(nil)
fmt.Printf("%x\n", sum)

func fileSha256(filePath string) ([]byte, error) {
    f, err := os.Open(filePath)
    if err != nil {
        return nil, err
    }
    defer f.Close()

    h := sha256.New()
    if _, err := io.Copy(h, f); err != nil {
        return nil, err
    }
    return h.Sum(nil), nil
}

expected := "a591a6d40bf420404a011733cfb7b190d62c65bf0bcda32b57b277d9ad9f146e"
actual := fmt.Sprintf("%x", fileSha256("data.txt"))
if actual == expected {
    fmt.Println("文件校验通过")
} else {
    fmt.Println("文件内容不匹配")
}

type Config struct {
    Host string `json:"host"`
    Port int    `json:"port"`
}

cfg := Config{Host: "localhost", Port: 8080}
data, _ := json.Marshal(cfg)
hash := sha256.Sum256(data)
fmt.Printf("Config hash: %x\n", hash)