// ## SHA1 Hashes                                    
                                         
package main                             
                    
// Package `crypto/sha1` computes SHA1 hashes.                       
import "crypto/sha1"                              
import "encoding/hex"                       
import "fmt"
                                         
func main() {             
    // The pattern is `sha1.New()`, `sha1.Write(bytes)`,               
    // then `sha1.Sum([]byte{})
    h := sha1.New()                      
                                         
    // `Write` expects bytes. If you have a string `s`     
    // use `[]byte(s)` to coerce it.                                
    h.Write([]byte("sha1 this string")) 
                                         
    // Get the result. The argument to `Sum` can be used
    // to append to an existing buffer: usually uneeded.                                     
    bs := h.Sum(nil)                     
                                         
    // SHA1 values are often printed in hex, for example   
    // with git.                                  
    fmt.Println(hex.EncodeToString(bs))                                           
}                                        

// You can compute other hashes using a similar
// pattern. For exmpale, to compute MD5 hashes
// import `crypto/md5` and use `md5.New()`.