ofb_test.go

Documentation: crypto/cipher

     1  // Copyright 2009 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  // OFB AES test vectors.
     6  
     7  // See U.S. National Institute of Standards and Technology (NIST)
     8  // Special Publication 800-38A, ``Recommendation for Block Cipher
     9  // Modes of Operation,'' 2001 Edition, pp. 52-55.
    10  
    11  package cipher_test
    12  
    13  import (
    14  	"bytes"
    15  	"crypto/aes"
    16  	"crypto/cipher"
    17  	"testing"
    18  )
    19  
    20  type ofbTest struct {
    21  	name string
    22  	key  []byte
    23  	iv   []byte
    24  	in   []byte
    25  	out  []byte
    26  }
    27  
    28  var ofbTests = []ofbTest{
    29  	// NIST SP 800-38A pp 52-55
    30  	{
    31  		"OFB-AES128",
    32  		commonKey128,
    33  		commonIV,
    34  		commonInput,
    35  		[]byte{
    36  			0x3b, 0x3f, 0xd9, 0x2e, 0xb7, 0x2d, 0xad, 0x20, 0x33, 0x34, 0x49, 0xf8, 0xe8, 0x3c, 0xfb, 0x4a,
    37  			0x77, 0x89, 0x50, 0x8d, 0x16, 0x91, 0x8f, 0x03, 0xf5, 0x3c, 0x52, 0xda, 0xc5, 0x4e, 0xd8, 0x25,
    38  			0x97, 0x40, 0x05, 0x1e, 0x9c, 0x5f, 0xec, 0xf6, 0x43, 0x44, 0xf7, 0xa8, 0x22, 0x60, 0xed, 0xcc,
    39  			0x30, 0x4c, 0x65, 0x28, 0xf6, 0x59, 0xc7, 0x78, 0x66, 0xa5, 0x10, 0xd9, 0xc1, 0xd6, 0xae, 0x5e,
    40  		},
    41  	},
    42  	{
    43  		"OFB-AES192",
    44  		commonKey192,
    45  		commonIV,
    46  		commonInput,
    47  		[]byte{
    48  			0xcd, 0xc8, 0x0d, 0x6f, 0xdd, 0xf1, 0x8c, 0xab, 0x34, 0xc2, 0x59, 0x09, 0xc9, 0x9a, 0x41, 0x74,
    49  			0xfc, 0xc2, 0x8b, 0x8d, 0x4c, 0x63, 0x83, 0x7c, 0x09, 0xe8, 0x17, 0x00, 0xc1, 0x10, 0x04, 0x01,
    50  			0x8d, 0x9a, 0x9a, 0xea, 0xc0, 0xf6, 0x59, 0x6f, 0x55, 0x9c, 0x6d, 0x4d, 0xaf, 0x59, 0xa5, 0xf2,
    51  			0x6d, 0x9f, 0x20, 0x08, 0x57, 0xca, 0x6c, 0x3e, 0x9c, 0xac, 0x52, 0x4b, 0xd9, 0xac, 0xc9, 0x2a,
    52  		},
    53  	},
    54  	{
    55  		"OFB-AES256",
    56  		commonKey256,
    57  		commonIV,
    58  		commonInput,
    59  		[]byte{
    60  			0xdc, 0x7e, 0x84, 0xbf, 0xda, 0x79, 0x16, 0x4b, 0x7e, 0xcd, 0x84, 0x86, 0x98, 0x5d, 0x38, 0x60,
    61  			0x4f, 0xeb, 0xdc, 0x67, 0x40, 0xd2, 0x0b, 0x3a, 0xc8, 0x8f, 0x6a, 0xd8, 0x2a, 0x4f, 0xb0, 0x8d,
    62  			0x71, 0xab, 0x47, 0xa0, 0x86, 0xe8, 0x6e, 0xed, 0xf3, 0x9d, 0x1c, 0x5b, 0xba, 0x97, 0xc4, 0x08,
    63  			0x01, 0x26, 0x14, 0x1d, 0x67, 0xf3, 0x7b, 0xe8, 0x53, 0x8f, 0x5a, 0x8b, 0xe7, 0x40, 0xe4, 0x84,
    64  		},
    65  	},
    66  }
    67  
    68  func TestOFB(t *testing.T) {
    69  	for _, tt := range ofbTests {
    70  		test := tt.name
    71  
    72  		c, err := aes.NewCipher(tt.key)
    73  		if err != nil {
    74  			t.Errorf("%s: NewCipher(%d bytes) = %s", test, len(tt.key), err)
    75  			continue
    76  		}
    77  
    78  		for j := 0; j <= 5; j += 5 {
    79  			plaintext := tt.in[0 : len(tt.in)-j]
    80  			ofb := cipher.NewOFB(c, tt.iv)
    81  			ciphertext := make([]byte, len(plaintext))
    82  			ofb.XORKeyStream(ciphertext, plaintext)
    83  			if !bytes.Equal(ciphertext, tt.out[:len(plaintext)]) {
    84  				t.Errorf("%s/%d: encrypting\ninput % x\nhave % x\nwant % x", test, len(plaintext), plaintext, ciphertext, tt.out)
    85  			}
    86  		}
    87  
    88  		for j := 0; j <= 5; j += 5 {
    89  			ciphertext := tt.out[0 : len(tt.in)-j]
    90  			ofb := cipher.NewOFB(c, tt.iv)
    91  			plaintext := make([]byte, len(ciphertext))
    92  			ofb.XORKeyStream(plaintext, ciphertext)
    93  			if !bytes.Equal(plaintext, tt.in[:len(ciphertext)]) {
    94  				t.Errorf("%s/%d: decrypting\nhave % x\nwant % x", test, len(ciphertext), plaintext, tt.in)
    95  			}
    96  		}
    97  
    98  		if t.Failed() {
    99  			break
   100  		}
   101  	}
   102  }
   103
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