ocfb_test.go

Documentation: golang.org/x/crypto/openpgp/packet

     1  // Copyright 2010 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package packet
     6  
     7  import (
     8  	"bytes"
     9  	"crypto/aes"
    10  	"crypto/rand"
    11  	"testing"
    12  )
    13  
    14  var commonKey128 = []byte{0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c}
    15  
    16  func testOCFB(t *testing.T, resync OCFBResyncOption) {
    17  	block, err := aes.NewCipher(commonKey128)
    18  	if err != nil {
    19  		t.Error(err)
    20  		return
    21  	}
    22  
    23  	plaintext := []byte("this is the plaintext, which is long enough to span several blocks.")
    24  	randData := make([]byte, block.BlockSize())
    25  	rand.Reader.Read(randData)
    26  	ocfb, prefix := NewOCFBEncrypter(block, randData, resync)
    27  	ciphertext := make([]byte, len(plaintext))
    28  	ocfb.XORKeyStream(ciphertext, plaintext)
    29  
    30  	ocfbdec := NewOCFBDecrypter(block, prefix, resync)
    31  	if ocfbdec == nil {
    32  		t.Errorf("NewOCFBDecrypter failed (resync: %t)", resync)
    33  		return
    34  	}
    35  	plaintextCopy := make([]byte, len(plaintext))
    36  	ocfbdec.XORKeyStream(plaintextCopy, ciphertext)
    37  
    38  	if !bytes.Equal(plaintextCopy, plaintext) {
    39  		t.Errorf("got: %x, want: %x (resync: %t)", plaintextCopy, plaintext, resync)
    40  	}
    41  }
    42  
    43  func TestOCFB(t *testing.T) {
    44  	testOCFB(t, OCFBNoResync)
    45  	testOCFB(t, OCFBResync)
    46  }
    47
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