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Source file src/crypto/cipher/ofb_test.go

Documentation: crypto/cipher

  // Copyright 2009 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.
  
  // OFB AES test vectors.
  
  // See U.S. National Institute of Standards and Technology (NIST)
  // Special Publication 800-38A, ``Recommendation for Block Cipher
  // Modes of Operation,'' 2001 Edition, pp. 52-55.
  
  package cipher_test
  
  import (
  	"bytes"
  	"crypto/aes"
  	"crypto/cipher"
  	"testing"
  )
  
  type ofbTest struct {
  	name string
  	key  []byte
  	iv   []byte
  	in   []byte
  	out  []byte
  }
  
  var ofbTests = []ofbTest{
  	// NIST SP 800-38A pp 52-55
  	{
  		"OFB-AES128",
  		commonKey128,
  		commonIV,
  		commonInput,
  		[]byte{
  			0x3b, 0x3f, 0xd9, 0x2e, 0xb7, 0x2d, 0xad, 0x20, 0x33, 0x34, 0x49, 0xf8, 0xe8, 0x3c, 0xfb, 0x4a,
  			0x77, 0x89, 0x50, 0x8d, 0x16, 0x91, 0x8f, 0x03, 0xf5, 0x3c, 0x52, 0xda, 0xc5, 0x4e, 0xd8, 0x25,
  			0x97, 0x40, 0x05, 0x1e, 0x9c, 0x5f, 0xec, 0xf6, 0x43, 0x44, 0xf7, 0xa8, 0x22, 0x60, 0xed, 0xcc,
  			0x30, 0x4c, 0x65, 0x28, 0xf6, 0x59, 0xc7, 0x78, 0x66, 0xa5, 0x10, 0xd9, 0xc1, 0xd6, 0xae, 0x5e,
  		},
  	},
  	{
  		"OFB-AES192",
  		commonKey192,
  		commonIV,
  		commonInput,
  		[]byte{
  			0xcd, 0xc8, 0x0d, 0x6f, 0xdd, 0xf1, 0x8c, 0xab, 0x34, 0xc2, 0x59, 0x09, 0xc9, 0x9a, 0x41, 0x74,
  			0xfc, 0xc2, 0x8b, 0x8d, 0x4c, 0x63, 0x83, 0x7c, 0x09, 0xe8, 0x17, 0x00, 0xc1, 0x10, 0x04, 0x01,
  			0x8d, 0x9a, 0x9a, 0xea, 0xc0, 0xf6, 0x59, 0x6f, 0x55, 0x9c, 0x6d, 0x4d, 0xaf, 0x59, 0xa5, 0xf2,
  			0x6d, 0x9f, 0x20, 0x08, 0x57, 0xca, 0x6c, 0x3e, 0x9c, 0xac, 0x52, 0x4b, 0xd9, 0xac, 0xc9, 0x2a,
  		},
  	},
  	{
  		"OFB-AES256",
  		commonKey256,
  		commonIV,
  		commonInput,
  		[]byte{
  			0xdc, 0x7e, 0x84, 0xbf, 0xda, 0x79, 0x16, 0x4b, 0x7e, 0xcd, 0x84, 0x86, 0x98, 0x5d, 0x38, 0x60,
  			0x4f, 0xeb, 0xdc, 0x67, 0x40, 0xd2, 0x0b, 0x3a, 0xc8, 0x8f, 0x6a, 0xd8, 0x2a, 0x4f, 0xb0, 0x8d,
  			0x71, 0xab, 0x47, 0xa0, 0x86, 0xe8, 0x6e, 0xed, 0xf3, 0x9d, 0x1c, 0x5b, 0xba, 0x97, 0xc4, 0x08,
  			0x01, 0x26, 0x14, 0x1d, 0x67, 0xf3, 0x7b, 0xe8, 0x53, 0x8f, 0x5a, 0x8b, 0xe7, 0x40, 0xe4, 0x84,
  		},
  	},
  }
  
  func TestOFB(t *testing.T) {
  	for _, tt := range ofbTests {
  		test := tt.name
  
  		c, err := aes.NewCipher(tt.key)
  		if err != nil {
  			t.Errorf("%s: NewCipher(%d bytes) = %s", test, len(tt.key), err)
  			continue
  		}
  
  		for j := 0; j <= 5; j += 5 {
  			plaintext := tt.in[0 : len(tt.in)-j]
  			ofb := cipher.NewOFB(c, tt.iv)
  			ciphertext := make([]byte, len(plaintext))
  			ofb.XORKeyStream(ciphertext, plaintext)
  			if !bytes.Equal(ciphertext, tt.out[:len(plaintext)]) {
  				t.Errorf("%s/%d: encrypting\ninput % x\nhave % x\nwant % x", test, len(plaintext), plaintext, ciphertext, tt.out)
  			}
  		}
  
  		for j := 0; j <= 5; j += 5 {
  			ciphertext := tt.out[0 : len(tt.in)-j]
  			ofb := cipher.NewOFB(c, tt.iv)
  			plaintext := make([]byte, len(ciphertext))
  			ofb.XORKeyStream(plaintext, ciphertext)
  			if !bytes.Equal(plaintext, tt.in[:len(ciphertext)]) {
  				t.Errorf("%s/%d: decrypting\nhave % x\nwant % x", test, len(ciphertext), plaintext, tt.in)
  			}
  		}
  
  		if t.Failed() {
  			break
  		}
  	}
  }
  

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