authenticate - example_test.go

     1  package authenticate_test
     2  
     3  import (
     4  	"fmt"
     5  	"os"
     6  	"time"
     7  
     8  	"vimagination.zapto.org/authenticate"
     9  )
    10  
    11  func Example() {
    12  	codec, err := authenticate.NewCodec([]byte("!THIS IS MY KEY!"), time.Second)
    13  	if err != nil {
    14  		fmt.Println(err)
    15  
    16  		return
    17  	}
    18  
    19  	message := []byte("My Message")
    20  	encoded := codec.Encode(message, nil)
    21  
    22  	if decoded, err := codec.Decode(encoded, nil); err != nil {
    23  		fmt.Println(err)
    24  	} else {
    25  		os.Stdout.Write(decoded)
    26  	}
    27  
    28  	encoded[0] = encoded[0] ^ 128
    29  
    30  	if decoded, err := codec.Decode(encoded, nil); err != nil {
    31  		fmt.Printf("\n\n%s", err)
    32  	} else {
    33  		os.Stdout.Write(decoded)
    34  	}
    35  
    36  	// Output:
    37  	// My Message
    38  	//
    39  	// error opening cipher text: cipher: message authentication failed
    40  }
    41