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Commit 80543aca authored by Russ Cox's avatar Russ Cox
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Public AES block interface. 

The higher-level stream modes will be in crypto/block.

R=r
DELTA=205  (136 added, 7 deleted, 62 changed)
OCL=29002
CL=29006
parent 1ed725d7
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Inline Side-by-side
Showing with 196 additions and 67 deletions
src/lib/crypto/aes/Makefile
View file @ 80543aca
......@@ -41,23 +41,29 @@ coverage: packages
O1=\
const.$O\
modes.$O\
O2=\
block.$O\
O3=\
cipher.$O\
phases: a1 a2
phases: a1 a2 a3
_obj$D/aes.a: phases
a1: $(O1)
$(AR) grc _obj$D/aes.a const.$O modes.$O
$(AR) grc _obj$D/aes.a const.$O
rm -f $(O1)
a2: $(O2)
$(AR) grc _obj$D/aes.a block.$O
rm -f $(O2)
a3: $(O3)
$(AR) grc _obj$D/aes.a cipher.$O
rm -f $(O3)
newpkg: clean
mkdir -p _obj$D
......@@ -66,6 +72,7 @@ newpkg: clean
$(O1): newpkg
$(O2): a1
$(O3): a2
$(O4): a3
nuke: clean
rm -f $(GOROOT)/pkg$D/aes.a
......
src/lib/crypto/aes/aes_test.go
View file @ 80543aca
......@@ -126,7 +126,7 @@ func TestTd(t *testing.T) {
// Appendix A of FIPS 197: Key expansion examples
type KeyTest struct {
key []uint32;
key []byte;
enc []uint32;
dec []uint32; // decryption expansion; not in FIPS 197, computed from C implementation.
}
......@@ -134,8 +134,8 @@ type KeyTest struct {
var keyTests = []KeyTest {
KeyTest {
// A.1. Expansion of a 128-bit Cipher Key
[]uint32 {
0x2b7e1516, 0x28aed2a6, 0xabf71588, 0x09cf4f3c
[]byte {
0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c
},
[]uint32 {
0x2b7e1516, 0x28aed2a6, 0xabf71588, 0x09cf4f3c,
......@@ -166,9 +166,9 @@ var keyTests = []KeyTest {
},
KeyTest {
// A.2. Expansion of a 192-bit Cipher Key
[]uint32 {
0x8e73b0f7, 0xda0e6452, 0xc810f32b, 0x809079e5,
0x62f8ead2, 0x522c6b7b,
[]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,
},
[]uint32 {
0x8e73b0f7, 0xda0e6452, 0xc810f32b, 0x809079e5,
......@@ -189,9 +189,9 @@ var keyTests = []KeyTest {
},
KeyTest {
// A.3. Expansion of a 256-bit Cipher Key
[]uint32 {
0x603deb10, 0x15ca71be, 0x2b73aef0, 0x857d7781,
0x1f352c07, 0x3b6108d7, 0x2d9810a3, 0x0914dff4,
[]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,
},
[]uint32 {
0x603deb10, 0x15ca71be, 0x2b73aef0, 0x857d7781,
......@@ -243,70 +243,108 @@ L:
// Appendix B, C of FIPS 197: Cipher examples, Example vectors.
type CryptTest struct {
key []uint32;
in []uint32;
out []uint32;
key []byte;
in []byte;
out []byte;
}
var encryptTests = []CryptTest {
CryptTest {
// Appendix B.
[]uint32 { 0x2b7e1516, 0x28aed2a6, 0xabf71588, 0x09cf4f3c, },
[]uint32 { 0x3243f6a8, 0x885a308d, 0x313198a2, 0xe0370734, },
[]uint32 { 0x3925841d, 0x02dc09fb, 0xdc118597, 0x196a0b32, },
[]byte { 0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c, },
[]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, },
},
CryptTest {
// Appendix C.1. AES-128
[]uint32 { 0x00010203, 0x04050607, 0x08090a0b, 0x0c0d0e0f, },
[]uint32 { 0x00112233, 0x44556677, 0x8899aabb, 0xccddeeff, },
[]uint32 { 0x69c4e0d8, 0x6a7b0430, 0xd8cdb780, 0x70b4c55a, },
[]byte { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, },
[]byte { 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff, },
[]byte { 0x69, 0xc4, 0xe0, 0xd8, 0x6a, 0x7b, 0x04, 0x30, 0xd8, 0xcd, 0xb7, 0x80, 0x70, 0xb4, 0xc5, 0x5a, },
},
CryptTest {
// Appendix C.2. AES-192
[]uint32 { 0x00010203, 0x04050607, 0x08090a0b, 0x0c0d0e0f,
0x10111213, 0x14151617, },
[]uint32 { 0x00112233, 0x44556677, 0x8899aabb, 0xccddeeff, },
[]uint32 { 0xdda97ca4, 0x864cdfe0, 0x6eaf70a0, 0xec0d7191, },
[]byte { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, },
[]byte { 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff, },
[]byte { 0xdd, 0xa9, 0x7c, 0xa4, 0x86, 0x4c, 0xdf, 0xe0, 0x6e, 0xaf, 0x70, 0xa0, 0xec, 0x0d, 0x71, 0x91, },
},
CryptTest {
// Appendix C.3. AES-256
[]uint32 { 0x00010203, 0x04050607, 0x08090a0b, 0x0c0d0e0f,
0x10111213, 0x14151617, 0x18191a1b, 0x1c1d1e1f, },
[]uint32 { 0x00112233, 0x44556677, 0x8899aabb, 0xccddeeff, },
[]uint32 { 0x8ea2b7ca, 0x516745bf, 0xeafc4990, 0x4b496089, },
[]byte { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, },
[]byte { 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff, },
[]byte { 0x8e, 0xa2, 0xb7, 0xca, 0x51, 0x67, 0x45, 0xbf, 0xea, 0xfc, 0x49, 0x90, 0x4b, 0x49, 0x60, 0x89, },
},
}
// Test encryption against FIPS 197 examples.
func TestEncrypt(t *testing.T) {
// Test encryptBlock against FIPS 197 examples.
func TestEncryptBlock(t *testing.T) {
for i, tt := range encryptTests {
n := 4*(len(tt.key) + 7);
n := len(tt.key) + 28;
enc := make([]uint32, n);
dec := make([]uint32, n);
expandKey(tt.key, enc, dec);
out := make([]uint32, len(tt.in));
out := make([]byte, len(tt.in));
encryptBlock(enc, tt.in, out);
for j, v := range out {
if v != tt.out[j] {
t.Errorf("encrypt %d: out[%d] = %#x, want %#x", i, j, v, tt.out[j]);
t.Errorf("encryptBlock %d: out[%d] = %#x, want %#x", i, j, v, tt.out[j]);
break;
}
}
}
}
// Test decryption against FIPS 197 examples.
func TestDecrypt(t *testing.T) {
// Test decryptBlock against FIPS 197 examples.
func TestDecryptBlock(t *testing.T) {
for i, tt := range encryptTests {
n := 4*(len(tt.key) + 7);
n := len(tt.key) + 28;
enc := make([]uint32, n);
dec := make([]uint32, n);
expandKey(tt.key, enc, dec);
plain := make([]uint32, len(tt.in));
plain := make([]byte, len(tt.in));
decryptBlock(dec, tt.out, plain);
for j, v := range plain {
if v != tt.in[j] {
t.Errorf("decrypt %d: plain[%d] = %#x, want %#x", i, j, v, tt.in[j]);
t.Errorf("decryptBlock %d: plain[%d] = %#x, want %#x", i, j, v, tt.in[j]);
break;
}
}
}
}
// Test Cipher Encrypt method against FIPS 197 examples.
func TestCipherEncrypt(t *testing.T) {
for i, tt := range encryptTests {
c, err := NewCipher(tt.key);
if err != nil {
t.Errorf("NewCipher(%d bytes) = %s", len(tt.key), err);
continue;
}
out := make([]byte, len(tt.in));
c.Encrypt(tt.in, out);
for j, v := range out {
if v != tt.out[j] {
t.Errorf("Cipher.Encrypt %d: out[%d] = %#x, want %#x", i, j, v, tt.out[j]);
break;
}
}
}
}
// Test Cipher Decrypt against FIPS 197 examples.
func TestCipherDecrypt(t *testing.T) {
for i, tt := range encryptTests {
c, err := NewCipher(tt.key);
if err != nil {
t.Errorf("NewCipher(%d bytes) = %s", len(tt.key), err);
continue;
}
plain := make([]byte, len(tt.in));
c.Decrypt(tt.out, plain);
for j, v := range plain {
if v != tt.in[j] {
t.Errorf("decryptBlock %d: plain[%d] = %#x, want %#x", i, j, v, tt.in[j]);
break;
}
}
......
src/lib/crypto/aes/block.go
View file @ 80543aca
......@@ -39,14 +39,19 @@ package aes
import "crypto/aes"
// Encrypt one block from src into dst, using the expanded key xk.
func encryptBlock(xk, src, dst []uint32) {
func encryptBlock(xk []uint32, src, dst []byte) {
var s0, s1, s2, s3, t0, t1, t2, t3 uint32;
s0 = uint32(src[0])<<24 | uint32(src[1])<<16 | uint32(src[2])<<8 | uint32(src[3]);
s1 = uint32(src[4])<<24 | uint32(src[5])<<16 | uint32(src[6])<<8 | uint32(src[7]);
s2 = uint32(src[8])<<24 | uint32(src[9])<<16 | uint32(src[10])<<8 | uint32(src[11]);
s3 = uint32(src[12])<<24 | uint32(src[13])<<16 | uint32(src[14])<<8 | uint32(src[15]);
// First round just XORs input with key.
s0 = src[0] ^ xk[0];
s1 = src[1] ^ xk[1];
s2 = src[2] ^ xk[2];
s3 = src[3] ^ xk[3];
s0 ^= xk[0];
s1 ^= xk[1];
s2 ^= xk[2];
s3 ^= xk[3];
// Middle rounds shuffle using tables.
// Number of rounds is set by length of expanded key.
......@@ -67,21 +72,31 @@ func encryptBlock(xk, src, dst []uint32) {
s2 = uint32(sbox0[t2>>24])<<24 | uint32(sbox0[t3>>16 & 0xff])<<16 | uint32(sbox0[t0>>8 & 0xff])<<8 | uint32(sbox0[t1 & 0xff]);
s3 = uint32(sbox0[t3>>24])<<24 | uint32(sbox0[t0>>16 & 0xff])<<16 | uint32(sbox0[t1>>8 & 0xff])<<8 | uint32(sbox0[t2 & 0xff]);
dst[0] = s0 ^ xk[k+0];
dst[1] = s1 ^ xk[k+1];
dst[2] = s2 ^ xk[k+2];
dst[3] = s3 ^ xk[k+3];
s0 ^= xk[k+0];
s1 ^= xk[k+1];
s2 ^= xk[k+2];
s3 ^= xk[k+3];
dst[0], dst[1], dst[2], dst[3] = byte(s0>>24), byte(s0>>16), byte(s0>>8), byte(s0);
dst[4], dst[5], dst[6], dst[7] = byte(s1>>24), byte(s1>>16), byte(s1>>8), byte(s1);
dst[8], dst[9], dst[10], dst[11] = byte(s2>>24), byte(s2>>16), byte(s2>>8), byte(s2);
dst[12], dst[13], dst[14], dst[15] = byte(s3>>24), byte(s3>>16), byte(s3>>8), byte(s3);
}
// Decrypt one block from src into dst, using the expanded key xk.
func decryptBlock(xk, src, dst []uint32) {
func decryptBlock(xk []uint32, src, dst []byte) {
var s0, s1, s2, s3, t0, t1, t2, t3 uint32;
s0 = uint32(src[0])<<24 | uint32(src[1])<<16 | uint32(src[2])<<8 | uint32(src[3]);
s1 = uint32(src[4])<<24 | uint32(src[5])<<16 | uint32(src[6])<<8 | uint32(src[7]);
s2 = uint32(src[8])<<24 | uint32(src[9])<<16 | uint32(src[10])<<8 | uint32(src[11]);
s3 = uint32(src[12])<<24 | uint32(src[13])<<16 | uint32(src[14])<<8 | uint32(src[15]);
// First round just XORs input with key.
s0 = src[0] ^ xk[0];
s1 = src[1] ^ xk[1];
s2 = src[2] ^ xk[2];
s3 = src[3] ^ xk[3];
s0 ^= xk[0];
s1 ^= xk[1];
s2 ^= xk[2];
s3 ^= xk[3];
// Middle rounds shuffle using tables.
// Number of rounds is set by length of expanded key.
......@@ -102,10 +117,15 @@ func decryptBlock(xk, src, dst []uint32) {
s2 = uint32(sbox1[t2>>24])<<24 | uint32(sbox1[t1>>16 & 0xff])<<16 | uint32(sbox1[t0>>8 & 0xff])<<8 | uint32(sbox1[t3 & 0xff]);
s3 = uint32(sbox1[t3>>24])<<24 | uint32(sbox1[t2>>16 & 0xff])<<16 | uint32(sbox1[t1>>8 & 0xff])<<8 | uint32(sbox1[t0 & 0xff]);
dst[0] = s0 ^ xk[k+0];
dst[1] = s1 ^ xk[k+1];
dst[2] = s2 ^ xk[k+2];
dst[3] = s3 ^ xk[k+3];
s0 ^= xk[k+0];
s1 ^= xk[k+1];
s2 ^= xk[k+2];
s3 ^= xk[k+3];
dst[0], dst[1], dst[2], dst[3] = byte(s0>>24), byte(s0>>16), byte(s0>>8), byte(s0);
dst[4], dst[5], dst[6], dst[7] = byte(s1>>24), byte(s1>>16), byte(s1>>8), byte(s1);
dst[8], dst[9], dst[10], dst[11] = byte(s2>>24), byte(s2>>16), byte(s2>>8), byte(s2);
dst[12], dst[13], dst[14], dst[15] = byte(s3>>24), byte(s3>>16), byte(s3>>8), byte(s3);
}
// Apply sbox0 to each byte in w.
......@@ -124,12 +144,12 @@ func rotw(w uint32) uint32 {
// Key expansion algorithm. See FIPS-197, Figure 11.
// Their rcon[i] is our powx[i-1] << 24.
func expandKey(key, enc, dec []uint32) {
func expandKey(key []byte, enc, dec []uint32) {
// Encryption key setup.
var i int;
nk := len(key);
nk := len(key) / 4;
for i = 0; i < nk; i++ {
enc[i] = key[i];
enc[i] = uint32(key[4*i])<<24 | uint32(key[4*i+1])<<16 | uint32(key[4*i+2])<<8 | uint32(key[4*i+3]);
}
for ; i < len(enc); i++ {
t := enc[i-1];
......
src/lib/crypto/aes/cipher.go 0 → 100644
View file @ 80543aca
// 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 aes
import (
"crypto/aes";
"os";
)
// The AES block size in bytes.
const BlockSize = 16;
// A Cipher is an instance of AES encryption using a particular key.
type Cipher struct {
enc []uint32;
dec []uint32;
}
// NewCipher creates and returns a new Cipher.
// The key argument should be the AES key,
// either 16, 24, or 32 bytes to select
// AES-128, AES-192, or AES-256.
func NewCipher(key []byte) (*Cipher, os.Error) {
switch len(key) {
default:
return nil, os.ErrorString("crypto/aes: invalid key size");
case 16, 24, 32:
break;
}
n := len(key) + 28;
c := &Cipher{make([]uint32, n), make([]uint32, n)};
expandKey(key, c.enc, c.dec);
return c, nil;
}
// BlockSize returns the AES block size, 16 bytes.
// It is necessary to satisfy the Key interface in the
// package "crypto/modes".
func (c *Cipher) BlockSize() int {
return BlockSize;
}
// Encrypt encrypts the 16-byte buffer src using the key k
// and stores the result in dst.
// Note that for amounts of data larger than a block,
// it is not safe to just call Encrypt on successive blocks;
// instead, use an encryption mode like AESCBC (see modes.go).
func (c *Cipher) Encrypt(src, dst []byte) {
encryptBlock(c.enc, src, dst);
}
// Decrypt decrypts the 16-byte buffer src using the key k
// and stores the result in dst.
func (c *Cipher) Decrypt(src, dst []byte) {
decryptBlock(c.dec, src, dst);
}
// Reset zeros the key data, so that it will no longer
// appear in the process's memory.
func (c *Cipher) Reset() {
for i := 0; i < len(c.enc); i++ {
c.enc[i] = 0;
}
for i := 0; i < len(c.dec); i++ {
c.dec[i] = 0;
}
}
src/lib/crypto/aes/modes.go deleted 100644 → 0
View file @ 1ed725d7
// 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 aes
// TODO(rsc): mode implementations go here.
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