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Source file src/crypto/cipher/cfb_test.go

Documentation: crypto/cipher

  // Copyright 2010 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  package cipher_test
  
  import (
  	"bytes"
  	"crypto/aes"
  	"crypto/cipher"
  	"crypto/rand"
  	"encoding/hex"
  	"testing"
  )
  
  // cfbTests contains the test vectors from
  // http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf, section
  // F.3.13.
  var cfbTests = []struct {
  	key, iv, plaintext, ciphertext string
  }{
  	{
  		"2b7e151628aed2a6abf7158809cf4f3c",
  		"000102030405060708090a0b0c0d0e0f",
  		"6bc1bee22e409f96e93d7e117393172a",
  		"3b3fd92eb72dad20333449f8e83cfb4a",
  	},
  	{
  		"2b7e151628aed2a6abf7158809cf4f3c",
  		"3B3FD92EB72DAD20333449F8E83CFB4A",
  		"ae2d8a571e03ac9c9eb76fac45af8e51",
  		"c8a64537a0b3a93fcde3cdad9f1ce58b",
  	},
  	{
  		"2b7e151628aed2a6abf7158809cf4f3c",
  		"C8A64537A0B3A93FCDE3CDAD9F1CE58B",
  		"30c81c46a35ce411e5fbc1191a0a52ef",
  		"26751f67a3cbb140b1808cf187a4f4df",
  	},
  	{
  		"2b7e151628aed2a6abf7158809cf4f3c",
  		"26751F67A3CBB140B1808CF187A4F4DF",
  		"f69f2445df4f9b17ad2b417be66c3710",
  		"c04b05357c5d1c0eeac4c66f9ff7f2e6",
  	},
  }
  
  func TestCFBVectors(t *testing.T) {
  	for i, test := range cfbTests {
  		key, err := hex.DecodeString(test.key)
  		if err != nil {
  			t.Fatal(err)
  		}
  		iv, err := hex.DecodeString(test.iv)
  		if err != nil {
  			t.Fatal(err)
  		}
  		plaintext, err := hex.DecodeString(test.plaintext)
  		if err != nil {
  			t.Fatal(err)
  		}
  		expected, err := hex.DecodeString(test.ciphertext)
  		if err != nil {
  			t.Fatal(err)
  		}
  
  		block, err := aes.NewCipher(key)
  		if err != nil {
  			t.Fatal(err)
  		}
  
  		ciphertext := make([]byte, len(plaintext))
  		cfb := cipher.NewCFBEncrypter(block, iv)
  		cfb.XORKeyStream(ciphertext, plaintext)
  
  		if !bytes.Equal(ciphertext, expected) {
  			t.Errorf("#%d: wrong output: got %x, expected %x", i, ciphertext, expected)
  		}
  
  		cfbdec := cipher.NewCFBDecrypter(block, iv)
  		plaintextCopy := make([]byte, len(ciphertext))
  		cfbdec.XORKeyStream(plaintextCopy, ciphertext)
  
  		if !bytes.Equal(plaintextCopy, plaintextCopy) {
  			t.Errorf("#%d: wrong plaintext: got %x, expected %x", i, plaintextCopy, plaintext)
  		}
  	}
  }
  
  func TestCFBInverse(t *testing.T) {
  	block, err := aes.NewCipher(commonKey128)
  	if err != nil {
  		t.Error(err)
  		return
  	}
  
  	plaintext := []byte("this is the plaintext. this is the plaintext.")
  	iv := make([]byte, block.BlockSize())
  	rand.Reader.Read(iv)
  	cfb := cipher.NewCFBEncrypter(block, iv)
  	ciphertext := make([]byte, len(plaintext))
  	copy(ciphertext, plaintext)
  	cfb.XORKeyStream(ciphertext, ciphertext)
  
  	cfbdec := cipher.NewCFBDecrypter(block, iv)
  	plaintextCopy := make([]byte, len(plaintext))
  	copy(plaintextCopy, ciphertext)
  	cfbdec.XORKeyStream(plaintextCopy, plaintextCopy)
  
  	if !bytes.Equal(plaintextCopy, plaintext) {
  		t.Errorf("got: %x, want: %x", plaintextCopy, plaintext)
  	}
  }
  

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