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