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

                                         // You can compute other hashes like MD5 using the
                                         // same pattern. Import `crypto/md5` and use
                                         // `md5.New()`.