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Crypto modes: CBC, CFB, ECB.
Not ready to link into build yet. Delta says 1272 lines but only 474 if you subtract the test files, which are mostly data. R=r DELTA=1252 (1249 added, 0 deleted, 3 changed) OCL=29013 CL=29037
This commit is contained in:
Russ Cox
parent
da49bfe664
commit
b0608c1391
75
src/lib/crypto/block/cbc.go
Normal file
75
src/lib/crypto/block/cbc.go
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@ -0,0 +1,75 @@
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// 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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// Cipher block chaining (CBC) mode.
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// CBC provides confidentiality by xoring (chaining) each plaintext block
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// with the previous ciphertext block before applying the block cipher.
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// See NIST SP 800-38A, pp 10-11
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package block
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import (
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"crypto/block";
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"io";
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)
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type cbcCipher struct {
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c Cipher;
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blockSize int;
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iv []byte;
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tmp []byte;
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}
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func newCBC(c Cipher, iv []byte) *cbcCipher {
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n := c.BlockSize();
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x := new(cbcCipher);
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x.c = c;
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x.blockSize = n;
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x.iv = copy(iv);
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x.tmp = make([]byte, n);
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return x;
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}
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func (x *cbcCipher) BlockSize() int {
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return x.blockSize;
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}
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func (x *cbcCipher) Encrypt(src, dst []byte) {
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for i := 0; i < x.blockSize; i++ {
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x.iv[i] ^= src[i];
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}
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x.c.Encrypt(x.iv, x.iv);
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for i := 0; i < x.blockSize; i++ {
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dst[i] = x.iv[i];
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}
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}
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func (x *cbcCipher) Decrypt(src, dst []byte) {
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x.c.Decrypt(src, x.tmp);
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for i := 0; i < x.blockSize; i++ {
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x.tmp[i] ^= x.iv[i];
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x.iv[i] = src[i];
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dst[i] = x.tmp[i];
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}
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}
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// NewCBCDecrypter returns a reader that reads data from r and decrypts it using c
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// in cipher block chaining (CBC) mode with the initialization vector iv.
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// The returned Reader does not buffer or read ahead except
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// as required by the cipher's block size.
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func NewCBCDecrypter(c Cipher, iv []byte, r io.Reader) io.Reader {
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return NewECBDecrypter(newCBC(c, iv), r);
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}
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// NewCBCEncrypter returns a writer that encrypts data using c
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// in cipher block chaining (CBC) mode with the initialization vector iv
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// and writes the encrypted data to w.
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// The returned Writer does no buffering except as required
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// by the cipher's block size, so there is no need for a Flush method.
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func NewCBCEncrypter(c Cipher, iv []byte, w io.Writer) io.Writer {
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return NewECBEncrypter(newCBC(c, iv), w);
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}
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107
src/lib/crypto/block/cbc_aes_test.go
Normal file
107
src/lib/crypto/block/cbc_aes_test.go
Normal file
@ -0,0 +1,107 @@
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// 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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// CBC 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. 24-29.
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package block
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// gobuild: $GC ecb_aes_test.go
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import (
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"crypto/aes";
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"crypto/block";
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"io";
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"os";
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"testing";
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"./ecb_aes_test";
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)
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type cbcTest 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 cbcAESTests = []cbcTest {
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// NIST SP 800-38A pp 27-29
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cbcTest {
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"CBC-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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0x76, 0x49, 0xab, 0xac, 0x81, 0x19, 0xb2, 0x46, 0xce, 0xe9, 0x8e, 0x9b, 0x12, 0xe9, 0x19, 0x7d,
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0x50, 0x86, 0xcb, 0x9b, 0x50, 0x72, 0x19, 0xee, 0x95, 0xdb, 0x11, 0x3a, 0x91, 0x76, 0x78, 0xb2,
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0x73, 0xbe, 0xd6, 0xb8, 0xe3, 0xc1, 0x74, 0x3b, 0x71, 0x16, 0xe6, 0x9e, 0x22, 0x22, 0x95, 0x16,
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0x3f, 0xf1, 0xca, 0xa1, 0x68, 0x1f, 0xac, 0x09, 0x12, 0x0e, 0xca, 0x30, 0x75, 0x86, 0xe1, 0xa7,
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},
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},
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cbcTest {
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"CBC-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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0x4f, 0x02, 0x1d, 0xb2, 0x43, 0xbc, 0x63, 0x3d, 0x71, 0x78, 0x18, 0x3a, 0x9f, 0xa0, 0x71, 0xe8,
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0xb4, 0xd9, 0xad, 0xa9, 0xad, 0x7d, 0xed, 0xf4, 0xe5, 0xe7, 0x38, 0x76, 0x3f, 0x69, 0x14, 0x5a,
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0x57, 0x1b, 0x24, 0x20, 0x12, 0xfb, 0x7a, 0xe0, 0x7f, 0xa9, 0xba, 0xac, 0x3d, 0xf1, 0x02, 0xe0,
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0x08, 0xb0, 0xe2, 0x79, 0x88, 0x59, 0x88, 0x81, 0xd9, 0x20, 0xa9, 0xe6, 0x4f, 0x56, 0x15, 0xcd,
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},
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},
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cbcTest {
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"CBC-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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0xf5, 0x8c, 0x4c, 0x04, 0xd6, 0xe5, 0xf1, 0xba, 0x77, 0x9e, 0xab, 0xfb, 0x5f, 0x7b, 0xfb, 0xd6,
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0x9c, 0xfc, 0x4e, 0x96, 0x7e, 0xdb, 0x80, 0x8d, 0x67, 0x9f, 0x77, 0x7b, 0xc6, 0x70, 0x2c, 0x7d,
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0x39, 0xf2, 0x33, 0x69, 0xa9, 0xd9, 0xba, 0xcf, 0xa5, 0x30, 0xe2, 0x63, 0x04, 0x23, 0x14, 0x61,
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0xb2, 0xeb, 0x05, 0xe2, 0xc3, 0x9b, 0xe9, 0xfc, 0xda, 0x6c, 0x19, 0x07, 0x8c, 0x6a, 0x9d, 0x1b,
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},
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},
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}
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func TestCBC_AES(t *testing.T) {
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for i, tt := range cbcAESTests {
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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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var crypt io.ByteBuffer;
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w := NewCBCEncrypter(c, tt.iv, &crypt);
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var r io.Reader = io.NewByteReader(tt.in);
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n, err := io.Copy(r, w);
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if n != int64(len(tt.in)) || err != nil {
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t.Errorf("%s: CBCEncrypter io.Copy = %d, %v want %d, nil", test, n, err, len(tt.in));
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} else if d := crypt.Data(); !same(tt.out, d) {
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t.Errorf("%s: CBCEncrypter\nhave %x\nwant %x", test, d, tt.out);
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}
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var plain io.ByteBuffer;
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r = NewCBCDecrypter(c, tt.iv, io.NewByteReader(tt.out));
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w = &plain;
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n, err = io.Copy(r, w);
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if n != int64(len(tt.out)) || err != nil {
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t.Errorf("%s: CBCDecrypter io.Copy = %d, %v want %d, nil", test, n, err, len(tt.out));
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} else if d := plain.Data(); !same(tt.in, d) {
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t.Errorf("%s: CBCDecrypter\nhave %x\nwant %x", test, d, tt.in);
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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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100
src/lib/crypto/block/cfb.go
Normal file
100
src/lib/crypto/block/cfb.go
Normal file
@ -0,0 +1,100 @@
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// 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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// Cipher feedback (CFB) mode.
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// CFB provides confidentiality by feeding a fraction of
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// the previous ciphertext in as the plaintext for the next
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// block operation.
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// See NIST SP 800-38A, pp 11-13
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package block
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import (
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"crypto/block";
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"io";
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)
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type cfbCipher struct {
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c Cipher;
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blockSize int; // our block size (s/8)
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cipherSize int; // underlying cipher block size
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iv []byte;
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tmp []byte;
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}
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func newCFB(c Cipher, s int, iv []byte) *cfbCipher {
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if s == 0 || s % 8 != 0 {
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panicln("invalid CFB mode", s);
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}
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b := c.BlockSize();
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x := new(cfbCipher);
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x.c = c;
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x.blockSize = s/8;
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x.cipherSize = b;
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x.iv = copy(iv);
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x.tmp = make([]byte, b);
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return x;
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}
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func (x *cfbCipher) BlockSize() int {
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return x.blockSize;
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}
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func (x *cfbCipher) Encrypt(src, dst []byte) {
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// Encrypt old IV and xor prefix with src to make dst.
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x.c.Encrypt(x.iv, x.tmp);
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for i := 0; i < x.blockSize; i++ {
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dst[i] = src[i] ^ x.tmp[i];
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}
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// Slide unused IV pieces down and insert dst at end.
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for i := 0; i < x.cipherSize - x.blockSize; i++ {
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x.iv[i] = x.iv[i + x.blockSize];
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}
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off := x.cipherSize - x.blockSize;
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for i := off; i < x.cipherSize; i++ {
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x.iv[i] = dst[i - off];
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}
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}
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func (x *cfbCipher) Decrypt(src, dst []byte) {
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// Encrypt [sic] old IV and xor prefix with src to make dst.
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x.c.Encrypt(x.iv, x.tmp);
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for i := 0; i < x.blockSize; i++ {
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dst[i] = src[i] ^ x.tmp[i];
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}
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// Slide unused IV pieces down and insert src at top.
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for i := 0; i < x.cipherSize - x.blockSize; i++ {
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x.iv[i] = x.iv[i + x.blockSize];
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}
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off := x.cipherSize - x.blockSize;
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for i := off; i < x.cipherSize; i++ {
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// Reconstruct src = dst ^ x.tmp
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// in case we overwrote src (src == dst).
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x.iv[i] = dst[i - off] ^ x.tmp[i - off];
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}
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}
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// NewCFBDecrypter returns a reader that reads data from r and decrypts it using c
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// in s-bit cipher feedback (CFB) mode with the initialization vector iv.
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// The returned Reader does not buffer or read ahead except
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// as required by the cipher's block size.
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// Modes for s not a multiple of 8 are unimplemented.
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func NewCFBDecrypter(c Cipher, s int, iv []byte, r io.Reader) io.Reader {
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return NewECBDecrypter(newCFB(c, s, iv), r);
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}
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// NewCFBEncrypter returns a writer that encrypts data using c
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// in s-bit cipher feedback (CFB) mode with the initialization vector iv
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// and writes the encrypted data to w.
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// The returned Writer does no buffering except as required
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// by the cipher's block size, so there is no need for a Flush method.
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// Modes for s not a multiple of 8 are unimplemented.
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func NewCFBEncrypter(c Cipher, s int, iv []byte, w io.Writer) io.Writer {
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return NewECBEncrypter(newCFB(c, s, iv), w);
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}
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316
src/lib/crypto/block/cfb_aes_test.go
Normal file
316
src/lib/crypto/block/cfb_aes_test.go
Normal file
@ -0,0 +1,316 @@
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// 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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|
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// CFB 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. 29-52.
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package block
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// gobuild: $GC ecb_aes_test.go
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import (
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"crypto/aes";
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"crypto/block";
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"io";
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"os";
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"testing";
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"./ecb_aes_test";
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)
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type cfbTest struct {
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name string;
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s int;
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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 cfbAESTests = []cfbTest {
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cfbTest {
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"CFB1-AES128",
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1,
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commonKey128,
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commonIV,
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[]byte{
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0<<7 | 1<<6 | 1<<5 | 0<<4 | 1<<3 | 0<<2 | 1<<1,
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1<<7 | 1<<6 | 0<<5 | 0<<4 | 0<<3 | 0<<2 | 0<<1,
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},
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[]byte{
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0<<7 | 1<<6 | 1<<5 | 0<<4 | 1<<3 | 0<<2 | 0<<1,
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1<<7 | 0<<6 | 1<<5 | 1<<4 | 0<<3 | 0<<2 | 1<<1,
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},
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},
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cfbTest {
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"CFB1-AES192",
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1,
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commonKey192,
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commonIV,
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[]byte{
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0<<7 | 1<<6 | 1<<5 | 0<<4 | 1<<3 | 0<<2 | 1<<1,
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1<<7 | 1<<6 | 0<<5 | 0<<4 | 0<<3 | 0<<2 | 0<<1,
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},
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[]byte{
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1<<7 | 0<<6 | 0<<5 | 1<<4 | 0<<3 | 0<<2 | 1<<1,
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0<<7 | 1<<6 | 0<<5 | 1<<4 | 1<<3 | 0<<2 | 0<<1,
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},
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},
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cfbTest {
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"CFB1-AES256",
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1,
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commonKey256,
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commonIV,
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[]byte{
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0<<7 | 1<<6 | 1<<5 | 0<<4 | 1<<3 | 0<<2 | 1<<1,
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1<<7 | 1<<6 | 0<<5 | 0<<4 | 0<<3 | 0<<2 | 0<<1,
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},
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[]byte{
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1<<7 | 0<<6 | 0<<5 | 1<<4 | 0<<3 | 0<<2 | 0<<1,
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0<<7 | 0<<6 | 1<<5 | 0<<4 | 1<<3 | 0<<2 | 0<<1,
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},
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},
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cfbTest {
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"CFB8-AES128",
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8,
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commonKey128,
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commonIV,
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[]byte{
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0x6b,
|
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0xc1,
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0xbe,
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0xe2,
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0x2e,
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0x40,
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0x9f,
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0x96,
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0xe9,
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0x3d,
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0x7e,
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0x11,
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0x73,
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0x93,
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0x17,
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0x2a,
|
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0xae,
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0x2d,
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},
|
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[]byte{
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0x3b,
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0x79,
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0x42,
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0x4c,
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0x9c,
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0x0d,
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0xd4,
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0x36,
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0xba,
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0xce,
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0x9e,
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0x0e,
|
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0xd4,
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0x58,
|
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0x6a,
|
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0x4f,
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0x32,
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0xb9,
|
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},
|
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},
|
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|
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cfbTest {
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"CFB8-AES192",
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8,
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commonKey192,
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commonIV,
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[]byte{
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0x6b,
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0xc1,
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0xbe,
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0xe2,
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0x2e,
|
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0x40,
|
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0x9f,
|
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0x96,
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0xe9,
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0x3d,
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0x7e,
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0x11,
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0x73,
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0x93,
|
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0x17,
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0x2a,
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0xae,
|
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0x2d,
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},
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[]byte{
|
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0xcd,
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0xa2,
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0x52,
|
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0x1e,
|
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0xf0,
|
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0xa9,
|
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0x05,
|
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0xca,
|
||||
0x44,
|
||||
0xcd,
|
||||
0x05,
|
||||
0x7c,
|
||||
0xbf,
|
||||
0x0d,
|
||||
0x47,
|
||||
0xa0,
|
||||
0x67,
|
||||
0x8a,
|
||||
},
|
||||
},
|
||||
|
||||
cfbTest {
|
||||
"CFB8-AES256",
|
||||
8,
|
||||
commonKey256,
|
||||
commonIV,
|
||||
[]byte{
|
||||
0x6b,
|
||||
0xc1,
|
||||
0xbe,
|
||||
0xe2,
|
||||
0x2e,
|
||||
0x40,
|
||||
0x9f,
|
||||
0x96,
|
||||
0xe9,
|
||||
0x3d,
|
||||
0x7e,
|
||||
0x11,
|
||||
0x73,
|
||||
0x93,
|
||||
0x17,
|
||||
0x2a,
|
||||
0xae,
|
||||
0x2d,
|
||||
},
|
||||
[]byte{
|
||||
0xdc,
|
||||
0x1f,
|
||||
0x1a,
|
||||
0x85,
|
||||
0x20,
|
||||
0xa6,
|
||||
0x4d,
|
||||
0xb5,
|
||||
0x5f,
|
||||
0xcc,
|
||||
0x8a,
|
||||
0xc5,
|
||||
0x54,
|
||||
0x84,
|
||||
0x4e,
|
||||
0x88,
|
||||
0x97,
|
||||
0x00,
|
||||
},
|
||||
},
|
||||
|
||||
cfbTest {
|
||||
"CFB128-AES128",
|
||||
128,
|
||||
commonKey128,
|
||||
commonIV,
|
||||
[]byte{
|
||||
0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96, 0xe9, 0x3d, 0x7e, 0x11, 0x73, 0x93, 0x17, 0x2a,
|
||||
0xae, 0x2d, 0x8a, 0x57, 0x1e, 0x03, 0xac, 0x9c, 0x9e, 0xb7, 0x6f, 0xac, 0x45, 0xaf, 0x8e, 0x51,
|
||||
0x30, 0xc8, 0x1c, 0x46, 0xa3, 0x5c, 0xe4, 0x11, 0xe5, 0xfb, 0xc1, 0x19, 0x1a, 0x0a, 0x52, 0xef,
|
||||
0xf6, 0x9f, 0x24, 0x45, 0xdf, 0x4f, 0x9b, 0x17, 0xad, 0x2b, 0x41, 0x7b, 0xe6, 0x6c, 0x37, 0x10,
|
||||
},
|
||||
[]byte{
|
||||
0x3b, 0x3f, 0xd9, 0x2e, 0xb7, 0x2d, 0xad, 0x20, 0x33, 0x34, 0x49, 0xf8, 0xe8, 0x3c, 0xfb, 0x4a,
|
||||
0xc8, 0xa6, 0x45, 0x37, 0xa0, 0xb3, 0xa9, 0x3f, 0xcd, 0xe3, 0xcd, 0xad, 0x9f, 0x1c, 0xe5, 0x8b,
|
||||
0x26, 0x75, 0x1f, 0x67, 0xa3, 0xcb, 0xb1, 0x40, 0xb1, 0x80, 0x8c, 0xf1, 0x87, 0xa4, 0xf4, 0xdf,
|
||||
0xc0, 0x4b, 0x05, 0x35, 0x7c, 0x5d, 0x1c, 0x0e, 0xea, 0xc4, 0xc6, 0x6f, 0x9f, 0xf7, 0xf2, 0xe6,
|
||||
},
|
||||
},
|
||||
|
||||
cfbTest {
|
||||
"CFB128-AES192",
|
||||
128,
|
||||
commonKey192,
|
||||
commonIV,
|
||||
[]byte{
|
||||
0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96, 0xe9, 0x3d, 0x7e, 0x11, 0x73, 0x93, 0x17, 0x2a,
|
||||
0xae, 0x2d, 0x8a, 0x57, 0x1e, 0x03, 0xac, 0x9c, 0x9e, 0xb7, 0x6f, 0xac, 0x45, 0xaf, 0x8e, 0x51,
|
||||
0x30, 0xc8, 0x1c, 0x46, 0xa3, 0x5c, 0xe4, 0x11, 0xe5, 0xfb, 0xc1, 0x19, 0x1a, 0x0a, 0x52, 0xef,
|
||||
0xf6, 0x9f, 0x24, 0x45, 0xdf, 0x4f, 0x9b, 0x17, 0xad, 0x2b, 0x41, 0x7b, 0xe6, 0x6c, 0x37, 0x10,
|
||||
},
|
||||
[]byte{
|
||||
0xcd, 0xc8, 0x0d, 0x6f, 0xdd, 0xf1, 0x8c, 0xab, 0x34, 0xc2, 0x59, 0x09, 0xc9, 0x9a, 0x41, 0x74,
|
||||
0x67, 0xce, 0x7f, 0x7f, 0x81, 0x17, 0x36, 0x21, 0x96, 0x1a, 0x2b, 0x70, 0x17, 0x1d, 0x3d, 0x7a,
|
||||
0x2e, 0x1e, 0x8a, 0x1d, 0xd5, 0x9b, 0x88, 0xb1, 0xc8, 0xe6, 0x0f, 0xed, 0x1e, 0xfa, 0xc4, 0xc9,
|
||||
0xc0, 0x5f, 0x9f, 0x9c, 0xa9, 0x83, 0x4f, 0xa0, 0x42, 0xae, 0x8f, 0xba, 0x58, 0x4b, 0x09, 0xff,
|
||||
},
|
||||
},
|
||||
|
||||
cfbTest {
|
||||
"CFB128-AES256",
|
||||
128,
|
||||
commonKey256,
|
||||
commonIV,
|
||||
[]byte{
|
||||
0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96, 0xe9, 0x3d, 0x7e, 0x11, 0x73, 0x93, 0x17, 0x2a,
|
||||
0xae, 0x2d, 0x8a, 0x57, 0x1e, 0x03, 0xac, 0x9c, 0x9e, 0xb7, 0x6f, 0xac, 0x45, 0xaf, 0x8e, 0x51,
|
||||
0x30, 0xc8, 0x1c, 0x46, 0xa3, 0x5c, 0xe4, 0x11, 0xe5, 0xfb, 0xc1, 0x19, 0x1a, 0x0a, 0x52, 0xef,
|
||||
0xf6, 0x9f, 0x24, 0x45, 0xdf, 0x4f, 0x9b, 0x17, 0xad, 0x2b, 0x41, 0x7b, 0xe6, 0x6c, 0x37, 0x10,
|
||||
},
|
||||
[]byte{
|
||||
0xdc, 0x7e, 0x84, 0xbf, 0xda, 0x79, 0x16, 0x4b, 0x7e, 0xcd, 0x84, 0x86, 0x98, 0x5d, 0x38, 0x60,
|
||||
0x39, 0xff, 0xed, 0x14, 0x3b, 0x28, 0xb1, 0xc8, 0x32, 0x11, 0x3c, 0x63, 0x31, 0xe5, 0x40, 0x7b,
|
||||
0xdf, 0x10, 0x13, 0x24, 0x15, 0xe5, 0x4b, 0x92, 0xa1, 0x3e, 0xd0, 0xa8, 0x26, 0x7a, 0xe2, 0xf9,
|
||||
0x75, 0xa3, 0x85, 0x74, 0x1a, 0xb9, 0xce, 0xf8, 0x20, 0x31, 0x62, 0x3d, 0x55, 0xb1, 0xe4, 0x71,
|
||||
},
|
||||
},
|
||||
}
|
||||
|
||||
func TestCFB_AES(t *testing.T) {
|
||||
for i, tt := range cfbAESTests {
|
||||
test := tt.name;
|
||||
|
||||
if tt.s == 1 {
|
||||
// 1-bit CFB not implemented
|
||||
continue;
|
||||
}
|
||||
|
||||
c, err := aes.NewCipher(tt.key);
|
||||
if err != nil {
|
||||
t.Errorf("%s: NewCipher(%d bytes) = %s", test, len(tt.key), err);
|
||||
continue;
|
||||
}
|
||||
|
||||
var crypt io.ByteBuffer;
|
||||
w := NewCFBEncrypter(c, tt.s, tt.iv, &crypt);
|
||||
var r io.Reader = io.NewByteReader(tt.in);
|
||||
n, err := io.Copy(r, w);
|
||||
if n != int64(len(tt.in)) || err != nil {
|
||||
t.Errorf("%s: CFBEncrypter io.Copy = %d, %v want %d, nil", test, n, err, len(tt.in));
|
||||
} else if d := crypt.Data(); !same(tt.out, d) {
|
||||
t.Errorf("%s: CFBEncrypter\nhave %x\nwant %x", test, d, tt.out);
|
||||
}
|
||||
|
||||
var plain io.ByteBuffer;
|
||||
r = NewCFBDecrypter(c, tt.s, tt.iv, io.NewByteReader(tt.out));
|
||||
w = &plain;
|
||||
n, err = io.Copy(r, w);
|
||||
if n != int64(len(tt.out)) || err != nil {
|
||||
t.Errorf("%s: CFBDecrypter io.Copy = %d, %v want %d, nil", test, n, err, len(tt.out));
|
||||
} else if d := plain.Data(); !same(tt.in, d) {
|
||||
t.Errorf("%s: CFBDecrypter\nhave %x\nwant %x", test, d, tt.in);
|
||||
}
|
||||
|
||||
if t.Failed() {
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
58
src/lib/crypto/block/cipher.go
Normal file
58
src/lib/crypto/block/cipher.go
Normal file
@ -0,0 +1,58 @@
|
||||
// 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.
|
||||
|
||||
// The block package implements standard block cipher modes
|
||||
// that can be wrapped around low-level block cipher implementations.
|
||||
// See http://csrc.nist.gov/groups/ST/toolkit/BCM/current_modes.html
|
||||
// and NIST Special Publication 800-38A.
|
||||
package block
|
||||
|
||||
// A Cipher represents an implementation of block cipher
|
||||
// using a given key. It provides the capability to encrypt
|
||||
// or decrypt individual blocks. The mode implementations
|
||||
// extend that capability to streams of blocks.
|
||||
type Cipher interface {
|
||||
// BlockSize returns the cipher's block size.
|
||||
BlockSize() int;
|
||||
|
||||
// Encrypt encrypts the first block in src into dst.
|
||||
// Src and dst may point at the same memory.
|
||||
Encrypt(src, dst []byte);
|
||||
|
||||
// Decrypt decrypts the first block in src into dst.
|
||||
// Src and dst may point at the same memory.
|
||||
Decrypt(src, dst []byte);
|
||||
}
|
||||
|
||||
// Utility routines
|
||||
|
||||
func shift1(src, dst []byte) byte {
|
||||
var b byte;
|
||||
for i := len(src)-1; i >= 0; i-- {
|
||||
bb := src[i]>>7;
|
||||
dst[i] = src[i]<<1 | b;
|
||||
b = bb;
|
||||
}
|
||||
return b;
|
||||
}
|
||||
|
||||
func same(p, q []byte) bool {
|
||||
if len(p) != len(q) {
|
||||
return false;
|
||||
}
|
||||
for i := 0; i < len(p); i++ {
|
||||
if p[i] != q[i] {
|
||||
return false;
|
||||
}
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
func copy(p []byte) []byte {
|
||||
q := make([]byte, len(p));
|
||||
for i, b := range p {
|
||||
q[i] = b;
|
||||
}
|
||||
return q;
|
||||
}
|
||||
271
src/lib/crypto/block/ecb.go
Normal file
271
src/lib/crypto/block/ecb.go
Normal file
@ -0,0 +1,271 @@
|
||||
// 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.
|
||||
|
||||
// Electronic codebook (ECB) mode.
|
||||
// ECB is a fancy name for ``encrypt and decrypt each block separately.''
|
||||
// It's a pretty bad thing to do for any large amount of data (more than one block),
|
||||
// because the individual blocks can still be identified, duplicated, and reordered.
|
||||
// The ECB implementation exists mainly to provide buffering for
|
||||
// the other modes, which wrap it by providing modified Ciphers.
|
||||
|
||||
// See NIST SP 800-38A, pp 9-10
|
||||
|
||||
package block
|
||||
|
||||
import (
|
||||
"crypto/block";
|
||||
"io";
|
||||
"os";
|
||||
)
|
||||
|
||||
type ecbDecrypter struct {
|
||||
c Cipher;
|
||||
r io.Reader;
|
||||
blockSize int; // block size
|
||||
|
||||
// Buffered data.
|
||||
// The buffer buf is used as storage for both
|
||||
// plain or crypt; at least one of those is nil at any given time.
|
||||
buf []byte;
|
||||
plain []byte; // plain text waiting to be read
|
||||
crypt []byte; // ciphertext waiting to be decrypted
|
||||
}
|
||||
|
||||
// Read into x.crypt until it has a full block or EOF or an error happens.
|
||||
func (x *ecbDecrypter) fillCrypt() os.Error {
|
||||
var err os.Error;
|
||||
for len(x.crypt) < x.blockSize {
|
||||
off := len(x.crypt);
|
||||
var m int;
|
||||
m, err = x.r.Read(x.crypt[off:x.blockSize]);
|
||||
x.crypt = x.crypt[0:off+m];
|
||||
if m == 0 {
|
||||
break;
|
||||
}
|
||||
|
||||
// If an error happened but we got enough
|
||||
// data to do some decryption, we can decrypt
|
||||
// first and report the error (with some data) later.
|
||||
// But if we don't have enough to decrypt,
|
||||
// have to stop now.
|
||||
if err != nil && len(x.crypt) < x.blockSize {
|
||||
break;
|
||||
}
|
||||
}
|
||||
return err;
|
||||
}
|
||||
|
||||
// Read from plain text buffer into p.
|
||||
func (x *ecbDecrypter) readPlain(p []byte) int {
|
||||
n := len(x.plain);
|
||||
if n > len(p) {
|
||||
n = len(p);
|
||||
}
|
||||
for i := 0; i < n; i++ {
|
||||
p[i] = x.plain[i];
|
||||
}
|
||||
if n < len(x.plain) {
|
||||
x.plain = x.plain[n:len(x.plain)];
|
||||
} else {
|
||||
x.plain = nil;
|
||||
}
|
||||
return n;
|
||||
}
|
||||
|
||||
func (x *ecbDecrypter) Read(p []byte) (n int, err os.Error) {
|
||||
if len(p) == 0 {
|
||||
return;
|
||||
}
|
||||
|
||||
// If there's no plaintext waiting and p is not big enough
|
||||
// to hold a whole cipher block, we'll have to work in the
|
||||
// cipher text buffer. Set it to non-nil so that the
|
||||
// code below will fill it.
|
||||
if x.plain == nil && len(p) < x.blockSize && x.crypt == nil {
|
||||
x.crypt = x.buf[0:0];
|
||||
}
|
||||
|
||||
// If there is a leftover cipher text buffer,
|
||||
// try to accumulate a full block.
|
||||
if x.crypt != nil {
|
||||
err = x.fillCrypt();
|
||||
if err != nil || len(x.crypt) == 0 {
|
||||
return;
|
||||
}
|
||||
x.c.Decrypt(x.crypt, x.crypt);
|
||||
x.plain = x.crypt;
|
||||
x.crypt = nil;
|
||||
}
|
||||
|
||||
// If there is a leftover plain text buffer, read from it.
|
||||
if x.plain != nil {
|
||||
n = x.readPlain(p);
|
||||
return;
|
||||
}
|
||||
|
||||
// Read and decrypt directly in caller's buffer.
|
||||
n, err = io.ReadAtLeast(x.r, p, x.blockSize);
|
||||
if err == io.ErrEOF && n == 0 {
|
||||
// EOF is okay on block boundary
|
||||
err = nil;
|
||||
return;
|
||||
}
|
||||
var i int;
|
||||
for i = 0; i+x.blockSize <= n; i += x.blockSize {
|
||||
a := p[i:i+x.blockSize];
|
||||
x.c.Decrypt(a, a);
|
||||
}
|
||||
|
||||
// There might be an encrypted fringe remaining.
|
||||
// Save it for next time.
|
||||
if i < n {
|
||||
p = p[i:n];
|
||||
for j, v := range p {
|
||||
x.buf[j] = p[j];
|
||||
}
|
||||
x.crypt = x.buf[0:len(p)];
|
||||
n = i;
|
||||
}
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
// NewECBDecrypter returns a reader that reads data from r and decrypts it using c.
|
||||
// It decrypts by calling c.Decrypt on each block in sequence;
|
||||
// this mode is known as electronic codebook mode, or ECB.
|
||||
// The returned Reader does not buffer or read ahead except
|
||||
// as required by the cipher's block size.
|
||||
func NewECBDecrypter(c Cipher, r io.Reader) io.Reader {
|
||||
x := new(ecbDecrypter);
|
||||
x.c = c;
|
||||
x.r = r;
|
||||
x.blockSize = c.BlockSize();
|
||||
x.buf = make([]byte, x.blockSize);
|
||||
return x;
|
||||
}
|
||||
|
||||
type ecbEncrypter struct {
|
||||
c Cipher;
|
||||
w io.Writer;
|
||||
blockSize int;
|
||||
|
||||
// Buffered data.
|
||||
// The buffer buf is used as storage for both
|
||||
// plain or crypt. If both are non-nil, plain
|
||||
// follows crypt in buf.
|
||||
buf []byte;
|
||||
plain []byte; // plain text waiting to be encrypted
|
||||
crypt []byte; // encrypted text waiting to be written
|
||||
}
|
||||
|
||||
// Flush the x.crypt buffer to x.w.
|
||||
func (x *ecbEncrypter) flushCrypt() os.Error {
|
||||
if len(x.crypt) == 0 {
|
||||
return nil;
|
||||
}
|
||||
n, err := x.w.Write(x.crypt);
|
||||
if n < len(x.crypt) {
|
||||
x.crypt = x.crypt[n:len(x.crypt)];
|
||||
if err == nil {
|
||||
err = io.ErrShortWrite;
|
||||
}
|
||||
}
|
||||
if err != nil {
|
||||
return err;
|
||||
}
|
||||
x.crypt = nil;
|
||||
return nil;
|
||||
}
|
||||
|
||||
// Slide x.plain down to the beginning of x.buf.
|
||||
// Plain is known to have less than one block of data,
|
||||
// so this is cheap enough.
|
||||
func (x *ecbEncrypter) slidePlain() {
|
||||
if len(x.plain) == 0 {
|
||||
x.plain = x.buf[0:0];
|
||||
} else if cap(x.plain) < cap(x.buf) {
|
||||
// plain and buf share same data,
|
||||
// but buf is before plain, so forward loop is correct
|
||||
for i := 0; i < len(x.plain); i++ {
|
||||
x.buf[i] = x.plain[i];
|
||||
}
|
||||
x.plain = x.buf[0:len(x.plain)];
|
||||
}
|
||||
}
|
||||
|
||||
// Fill x.plain from the data in p.
|
||||
// Return the number of bytes copied.
|
||||
func (x *ecbEncrypter) fillPlain(p []byte) int {
|
||||
off := len(x.plain);
|
||||
n := len(p);
|
||||
if max := cap(x.plain) - off; n > max {
|
||||
n = max;
|
||||
}
|
||||
x.plain = x.plain[0:off+n];
|
||||
for i := 0; i < n; i++ {
|
||||
x.plain[off + i] = p[i];
|
||||
}
|
||||
return n;
|
||||
}
|
||||
|
||||
// Encrypt x.plain; record encrypted range as x.crypt.
|
||||
func (x *ecbEncrypter) encrypt() {
|
||||
var i int;
|
||||
n := len(x.plain);
|
||||
for i = 0; i+x.blockSize <= n; i += x.blockSize {
|
||||
a := x.plain[i:i+x.blockSize];
|
||||
x.c.Encrypt(a, a);
|
||||
}
|
||||
x.crypt = x.plain[0:i];
|
||||
x.plain = x.plain[i:n];
|
||||
}
|
||||
|
||||
func (x *ecbEncrypter) Write(p []byte) (n int, err os.Error) {
|
||||
for {
|
||||
// If there is data waiting to be written, write it.
|
||||
// This can happen on the first iteration
|
||||
// if a write failed in an earlier call.
|
||||
if err = x.flushCrypt(); err != nil {
|
||||
return;
|
||||
}
|
||||
|
||||
// Now that encrypted data is gone (flush ran),
|
||||
// perhaps we need to slide the plaintext down.
|
||||
x.slidePlain();
|
||||
|
||||
// Fill plaintext buffer from p.
|
||||
m := x.fillPlain(p);
|
||||
if m == 0 {
|
||||
break;
|
||||
}
|
||||
n += m;
|
||||
p = p[m:len(p)];
|
||||
|
||||
// Encrypt, adjusting crypt and plain.
|
||||
x.encrypt();
|
||||
|
||||
// Write x.crypt.
|
||||
if err = x.flushCrypt(); err != nil {
|
||||
break;
|
||||
}
|
||||
}
|
||||
return;
|
||||
}
|
||||
|
||||
// NewECBEncrypter returns a writer that encrypts data using c and writes it to w.
|
||||
// It encrypts by calling c.Encrypt on each block in sequence;
|
||||
// this mode is known as electronic codebook mode, or ECB.
|
||||
// The returned Writer does no buffering except as required
|
||||
// by the cipher's block size, so there is no need for a Flush method.
|
||||
func NewECBEncrypter(c Cipher, w io.Writer) io.Writer {
|
||||
x := new(ecbEncrypter);
|
||||
x.c = c;
|
||||
x.w = w;
|
||||
x.blockSize = c.BlockSize();
|
||||
|
||||
// Create a buffer that is an integral number of blocks.
|
||||
x.buf = make([]byte, 8192/x.blockSize * x.blockSize);
|
||||
return x;
|
||||
}
|
||||
|
||||
136
src/lib/crypto/block/ecb_aes_test.go
Normal file
136
src/lib/crypto/block/ecb_aes_test.go
Normal file
@ -0,0 +1,136 @@
|
||||
// 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.
|
||||
|
||||
// ECB 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. 24-27.
|
||||
|
||||
package block
|
||||
|
||||
import (
|
||||
"crypto/aes";
|
||||
"crypto/block";
|
||||
"io";
|
||||
"os";
|
||||
"testing";
|
||||
)
|
||||
|
||||
type ecbTest struct {
|
||||
name string;
|
||||
key []byte;
|
||||
in []byte;
|
||||
out []byte;
|
||||
}
|
||||
|
||||
var commonInput = []byte {
|
||||
0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96, 0xe9, 0x3d, 0x7e, 0x11, 0x73, 0x93, 0x17, 0x2a,
|
||||
0xae, 0x2d, 0x8a, 0x57, 0x1e, 0x03, 0xac, 0x9c, 0x9e, 0xb7, 0x6f, 0xac, 0x45, 0xaf, 0x8e, 0x51,
|
||||
0x30, 0xc8, 0x1c, 0x46, 0xa3, 0x5c, 0xe4, 0x11, 0xe5, 0xfb, 0xc1, 0x19, 0x1a, 0x0a, 0x52, 0xef,
|
||||
0xf6, 0x9f, 0x24, 0x45, 0xdf, 0x4f, 0x9b, 0x17, 0xad, 0x2b, 0x41, 0x7b, 0xe6, 0x6c, 0x37, 0x10,
|
||||
}
|
||||
|
||||
var commonKey128 = []byte {
|
||||
0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c,
|
||||
}
|
||||
|
||||
var commonKey192 = []byte {
|
||||
0x8e, 0x73, 0xb0, 0xf7, 0xda, 0x0e, 0x64, 0x52, 0xc8, 0x10, 0xf3, 0x2b, 0x80, 0x90, 0x79, 0xe5,
|
||||
0x62, 0xf8, 0xea, 0xd2, 0x52, 0x2c, 0x6b, 0x7b,
|
||||
}
|
||||
|
||||
var commonKey256 = []byte {
|
||||
0x60, 0x3d, 0xeb, 0x10, 0x15, 0xca, 0x71, 0xbe, 0x2b, 0x73, 0xae, 0xf0, 0x85, 0x7d, 0x77, 0x81,
|
||||
0x1f, 0x35, 0x2c, 0x07, 0x3b, 0x61, 0x08, 0xd7, 0x2d, 0x98, 0x10, 0xa3, 0x09, 0x14, 0xdf, 0xf4,
|
||||
}
|
||||
|
||||
var commonIV = []byte {
|
||||
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
|
||||
}
|
||||
|
||||
var ecbAESTests = []ecbTest {
|
||||
// FIPS 197, Appendix B, C
|
||||
ecbTest {
|
||||
"FIPS-197 Appendix B",
|
||||
commonKey128,
|
||||
[]byte {
|
||||
0x32, 0x43, 0xf6, 0xa8, 0x88, 0x5a, 0x30, 0x8d, 0x31, 0x31, 0x98, 0xa2, 0xe0, 0x37, 0x07, 0x34,
|
||||
},
|
||||
[]byte {
|
||||
0x39, 0x25, 0x84, 0x1d, 0x02, 0xdc, 0x09, 0xfb, 0xdc, 0x11, 0x85, 0x97, 0x19, 0x6a, 0x0b, 0x32,
|
||||
}
|
||||
},
|
||||
|
||||
// NIST SP 800-38A pp 24-27
|
||||
ecbTest {
|
||||
"ECB-AES128",
|
||||
commonKey128,
|
||||
commonInput,
|
||||
[]byte {
|
||||
0x3a, 0xd7, 0x7b, 0xb4, 0x0d, 0x7a, 0x36, 0x60, 0xa8, 0x9e, 0xca, 0xf3, 0x24, 0x66, 0xef, 0x97,
|
||||
0xf5, 0xd3, 0xd5, 0x85, 0x03, 0xb9, 0x69, 0x9d, 0xe7, 0x85, 0x89, 0x5a, 0x96, 0xfd, 0xba, 0xaf,
|
||||
0x43, 0xb1, 0xcd, 0x7f, 0x59, 0x8e, 0xce, 0x23, 0x88, 0x1b, 0x00, 0xe3, 0xed, 0x03, 0x06, 0x88,
|
||||
0x7b, 0x0c, 0x78, 0x5e, 0x27, 0xe8, 0xad, 0x3f, 0x82, 0x23, 0x20, 0x71, 0x04, 0x72, 0x5d, 0xd4,
|
||||
}
|
||||
},
|
||||
ecbTest {
|
||||
"ECB-AES192",
|
||||
commonKey192,
|
||||
commonInput,
|
||||
[]byte {
|
||||
0xbd, 0x33, 0x4f, 0x1d, 0x6e, 0x45, 0xf2, 0x5f, 0xf7, 0x12, 0xa2, 0x14, 0x57, 0x1f, 0xa5, 0xcc,
|
||||
0x97, 0x41, 0x04, 0x84, 0x6d, 0x0a, 0xd3, 0xad, 0x77, 0x34, 0xec, 0xb3, 0xec, 0xee, 0x4e, 0xef,
|
||||
0xef, 0x7a, 0xfd, 0x22, 0x70, 0xe2, 0xe6, 0x0a, 0xdc, 0xe0, 0xba, 0x2f, 0xac, 0xe6, 0x44, 0x4e,
|
||||
0x9a, 0x4b, 0x41, 0xba, 0x73, 0x8d, 0x6c, 0x72, 0xfb, 0x16, 0x69, 0x16, 0x03, 0xc1, 0x8e, 0x0e,
|
||||
}
|
||||
},
|
||||
ecbTest {
|
||||
"ECB-AES256",
|
||||
commonKey256,
|
||||
commonInput,
|
||||
[]byte {
|
||||
0xf3, 0xee, 0xd1, 0xbd, 0xb5, 0xd2, 0xa0, 0x3c, 0x06, 0x4b, 0x5a, 0x7e, 0x3d, 0xb1, 0x81, 0xf8,
|
||||
0x59, 0x1c, 0xcb, 0x10, 0xd4, 0x10, 0xed, 0x26, 0xdc, 0x5b, 0xa7, 0x4a, 0x31, 0x36, 0x28, 0x70,
|
||||
0xb6, 0xed, 0x21, 0xb9, 0x9c, 0xa6, 0xf4, 0xf9, 0xf1, 0x53, 0xe7, 0xb1, 0xbe, 0xaf, 0xed, 0x1d,
|
||||
0x23, 0x30, 0x4b, 0x7a, 0x39, 0xf9, 0xf3, 0xff, 0x06, 0x7d, 0x8d, 0x8f, 0x9e, 0x24, 0xec, 0xc7,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func TestECB_AES(t *testing.T) {
|
||||
for i, tt := range ecbAESTests {
|
||||
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;
|
||||
}
|
||||
|
||||
var crypt io.ByteBuffer;
|
||||
w := NewECBEncrypter(c, &crypt);
|
||||
var r io.Reader = io.NewByteReader(tt.in);
|
||||
n, err := io.Copy(r, w);
|
||||
if n != int64(len(tt.in)) || err != nil {
|
||||
t.Errorf("%s: ECBReader io.Copy = %d, %v want %d, nil", test, n, err, len(tt.in));
|
||||
} else if d := crypt.Data(); !same(tt.out, d) {
|
||||
t.Errorf("%s: ECBReader\nhave %x\nwant %x", test, d, tt.out);
|
||||
}
|
||||
|
||||
var plain io.ByteBuffer;
|
||||
r = NewECBDecrypter(c, io.NewByteReader(tt.out));
|
||||
w = &plain;
|
||||
n, err = io.Copy(r, w);
|
||||
if n != int64(len(tt.out)) || err != nil {
|
||||
t.Errorf("%s: ECBWriter io.Copy = %d, %v want %d, nil", test, n, err, len(tt.out));
|
||||
} else if d := plain.Data(); !same(tt.in, d) {
|
||||
t.Errorf("%s: ECBWriter\nhave %x\nwant %x", test, d, tt.in);
|
||||
}
|
||||
|
||||
if t.Failed() {
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
183
src/lib/crypto/block/ecb_test.go
Normal file
183
src/lib/crypto/block/ecb_test.go
Normal file
@ -0,0 +1,183 @@
|
||||
// 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.
|
||||
|
||||
package block
|
||||
|
||||
import (
|
||||
"crypto/block";
|
||||
"fmt";
|
||||
"io";
|
||||
"testing";
|
||||
"testing/iotest";
|
||||
)
|
||||
|
||||
// Simple Cipher for testing: adds an incrementing amount
|
||||
// to each byte in each
|
||||
type IncCipher struct {
|
||||
blockSize int;
|
||||
delta byte;
|
||||
encrypting bool;
|
||||
}
|
||||
|
||||
func (c *IncCipher) BlockSize() int {
|
||||
return c.blockSize;
|
||||
}
|
||||
|
||||
func (c *IncCipher) Encrypt(src, dst []byte) {
|
||||
if !c.encrypting {
|
||||
panicln("encrypt: not encrypting");
|
||||
}
|
||||
if len(src) != c.blockSize || len(dst) != c.blockSize {
|
||||
panicln("encrypt: wrong block size", c.blockSize, len(src), len(dst));
|
||||
}
|
||||
c.delta++;
|
||||
for i, b := range src {
|
||||
dst[i] = b + c.delta;
|
||||
}
|
||||
}
|
||||
|
||||
func (c *IncCipher) Decrypt(src, dst []byte) {
|
||||
if c.encrypting {
|
||||
panicln("decrypt: not decrypting");
|
||||
}
|
||||
if len(src) != c.blockSize || len(dst) != c.blockSize {
|
||||
panicln("decrypt: wrong block size", c.blockSize, len(src), len(dst));
|
||||
}
|
||||
c.delta--;
|
||||
for i, b := range src {
|
||||
dst[i] = b + c.delta;
|
||||
}
|
||||
}
|
||||
|
||||
func TestECBEncrypter(t *testing.T) {
|
||||
var plain, crypt [256]byte;
|
||||
for i := 0; i < len(plain); i++ {
|
||||
plain[i] = byte(i);
|
||||
}
|
||||
b := new(io.ByteBuffer);
|
||||
for block := 1; block <= 64; block *= 2 {
|
||||
// compute encrypted version
|
||||
delta := byte(0);
|
||||
for i := 0; i < len(crypt); i++ {
|
||||
if i % block == 0 {
|
||||
delta++;
|
||||
}
|
||||
crypt[i] = plain[i] + delta;
|
||||
}
|
||||
|
||||
for frag := 0; frag < 2; frag++ {
|
||||
c := &IncCipher{block, 0, true};
|
||||
b.Reset();
|
||||
r := io.NewByteReader(&plain);
|
||||
w := NewECBEncrypter(c, b);
|
||||
|
||||
// copy plain into w in increasingly large chunks: 1, 1, 2, 4, 8, ...
|
||||
// if frag != 0, move the 1 to the end to cause fragmentation.
|
||||
if frag == 0 {
|
||||
nn, err := io.Copyn(r, w, 1);
|
||||
if err != nil {
|
||||
t.Errorf("block=%d frag=0: first Copyn: %s", block, err);
|
||||
continue;
|
||||
}
|
||||
}
|
||||
for n := 1; n <= len(plain)/2; n *= 2 {
|
||||
nn, err := io.Copyn(r, w, int64(n));
|
||||
if err != nil {
|
||||
t.Errorf("block=%d frag=%d: Copyn %d: %s", block, frag, n, err);
|
||||
}
|
||||
}
|
||||
if frag != 0 {
|
||||
nn, err := io.Copyn(r, w, 1);
|
||||
if err != nil {
|
||||
t.Errorf("block=%d frag=1: last Copyn: %s", block, err);
|
||||
continue;
|
||||
}
|
||||
}
|
||||
|
||||
// check output
|
||||
data := b.Data();
|
||||
if len(data) != len(crypt) {
|
||||
t.Errorf("block=%d frag=%d: want %d bytes, got %d", block, frag, len(crypt), len(data));
|
||||
continue;
|
||||
}
|
||||
|
||||
if string(data) != string(&crypt) {
|
||||
t.Errorf("block=%d frag=%d: want %x got %x", block, frag, data, crypt);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func testECBDecrypter(t *testing.T, maxio int) {
|
||||
var readers = []func(io.Reader) io.Reader {
|
||||
func (r io.Reader) io.Reader { return r },
|
||||
iotest.OneByteReader,
|
||||
iotest.HalfReader,
|
||||
};
|
||||
var plain, crypt [256]byte;
|
||||
for i := 0; i < len(plain); i++ {
|
||||
plain[i] = byte(255 - i);
|
||||
}
|
||||
b := new(io.ByteBuffer);
|
||||
for block := 1; block <= 64 && block <= maxio; block *= 2 {
|
||||
// compute encrypted version
|
||||
delta := byte(0);
|
||||
for i := 0; i < len(crypt); i++ {
|
||||
if i % block == 0 {
|
||||
delta++;
|
||||
}
|
||||
crypt[i] = plain[i] + delta;
|
||||
}
|
||||
|
||||
for mode := 0; mode < len(readers); mode++ {
|
||||
for frag := 0; frag < 2; frag++ {
|
||||
test := fmt.Sprintf("block=%d mode=%d frag=%d maxio=%d", block, mode, frag, maxio);
|
||||
c := &IncCipher{block, 0, false};
|
||||
b.Reset();
|
||||
r := NewECBDecrypter(c, readers[mode](io.NewByteReader(crypt[0:maxio])));
|
||||
|
||||
// read from crypt in increasingly large chunks: 1, 1, 2, 4, 8, ...
|
||||
// if frag == 1, move the 1 to the end to cause fragmentation.
|
||||
if frag == 0 {
|
||||
nn, err := io.Copyn(r, b, 1);
|
||||
if err != nil {
|
||||
t.Errorf("%s: first Copyn: %s", test, err);
|
||||
continue;
|
||||
}
|
||||
}
|
||||
for n := 1; n <= maxio/2; n *= 2 {
|
||||
nn, err := io.Copyn(r, b, int64(n));
|
||||
if err != nil {
|
||||
t.Errorf("%s: Copyn %d: %s", test, n, err);
|
||||
}
|
||||
}
|
||||
if frag != 0 {
|
||||
nn, err := io.Copyn(r, b, 1);
|
||||
if err != nil {
|
||||
t.Errorf("%s: last Copyn: %s", test, err);
|
||||
continue;
|
||||
}
|
||||
}
|
||||
|
||||
// check output
|
||||
data := b.Data();
|
||||
if len(data) != maxio {
|
||||
t.Errorf("%s: want %d bytes, got %d", test, maxio, len(data));
|
||||
continue;
|
||||
}
|
||||
|
||||
if string(data) != string(plain[0:maxio]) {
|
||||
t.Errorf("%s: input=%x want %x got %x", test, crypt[0:maxio], plain[0:maxio], data);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func TestECBDecrypter(t *testing.T) {
|
||||
// Do shorter I/O sizes first; they're easier to debug.
|
||||
for n := 1; n <= 256 && !t.Failed(); n *= 2 {
|
||||
testECBDecrypter(t, n);
|
||||
}
|
||||
}
|
||||
@ -27,6 +27,9 @@ var ErrShortWrite os.Error = &Error{"short write"}
|
||||
|
||||
|
||||
// Reader is the interface that wraps the basic Read method.
|
||||
// An implementation of Read is allowed to use all of p for
|
||||
// scratch space during the call, even if it eventually returns
|
||||
// n < len(p).
|
||||
type Reader interface {
|
||||
Read(p []byte) (n int, err os.Error);
|
||||
}
|
||||
@ -80,10 +83,11 @@ func WriteString(w Writer, s string) (n int, err os.Error) {
|
||||
return w.Write(StringBytes(s))
|
||||
}
|
||||
|
||||
// FullRead reads r until the buffer buf is full, or until EOF or error.
|
||||
func FullRead(r Reader, buf []byte) (n int, err os.Error) {
|
||||
// ReadAtLeast reads r into buf until at least min bytes have been read,
|
||||
// or until EOF or error.
|
||||
func ReadAtLeast(r Reader, buf []byte, min int) (n int, err os.Error) {
|
||||
n = 0;
|
||||
for n < len(buf) {
|
||||
for n < min {
|
||||
nn, e := r.Read(buf[n:len(buf)]);
|
||||
if nn > 0 {
|
||||
n += nn
|
||||
@ -98,6 +102,13 @@ func FullRead(r Reader, buf []byte) (n int, err os.Error) {
|
||||
return n, nil
|
||||
}
|
||||
|
||||
// FullRead reads r until the buffer buf is full, or until EOF or error.
|
||||
func FullRead(r Reader, buf []byte) (n int, err os.Error) {
|
||||
// TODO(rsc): 6g bug prevents obvious return
|
||||
n, err = ReadAtLeast(r, buf, len(buf));
|
||||
return;
|
||||
}
|
||||
|
||||
// Convert something that implements Read into something
|
||||
// whose Reads are always FullReads
|
||||
type fullRead struct {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user