Java example source code file (Crypt.java)
The Crypt.java Java example source code/*
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*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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/* Copyright (c) 1988 AT&T */
/* All Rights Reserved */
/**
* Implements the UNIX crypt(3) function, based on a direct port of the
* libc crypt function.
*
* <p>
* From the crypt man page:
* <p>
* crypt() is the password encryption routine, based on the NBS
* Data Encryption Standard, with variations intended (among
* other things) to frustrate use of hardware implementations
* of the DES for key search.
* <p>
* The first argument to crypt() is normally a user's typed
* password. The second is a 2-character string chosen from
* the set [a-zA-Z0-9./]. the salt string is used to perturb
* the DES algorithm in one
* of 4096 different ways, after which the password is used as
* the key to encrypt repeatedly a constant string. The
* returned value points to the encrypted password, in the same
* alphabet as the salt. The first two characters are the salt
* itself.
*
* @author Roland Schemers
*/
package com.sun.security.auth.module;
class Crypt {
/* EXPORT DELETE START */
private static final byte[] IP = {
58, 50, 42, 34, 26, 18, 10, 2,
60, 52, 44, 36, 28, 20, 12, 4,
62, 54, 46, 38, 30, 22, 14, 6,
64, 56, 48, 40, 32, 24, 16, 8,
57, 49, 41, 33, 25, 17, 9, 1,
59, 51, 43, 35, 27, 19, 11, 3,
61, 53, 45, 37, 29, 21, 13, 5,
63, 55, 47, 39, 31, 23, 15, 7,
};
private static final byte[] FP = {
40, 8, 48, 16, 56, 24, 64, 32,
39, 7, 47, 15, 55, 23, 63, 31,
38, 6, 46, 14, 54, 22, 62, 30,
37, 5, 45, 13, 53, 21, 61, 29,
36, 4, 44, 12, 52, 20, 60, 28,
35, 3, 43, 11, 51, 19, 59, 27,
34, 2, 42, 10, 50, 18, 58, 26,
33, 1, 41, 9, 49, 17, 57, 25,
};
private static final byte[] PC1_C = {
57, 49, 41, 33, 25, 17, 9,
1, 58, 50, 42, 34, 26, 18,
10, 2, 59, 51, 43, 35, 27,
19, 11, 3, 60, 52, 44, 36,
};
private static final byte[] PC1_D = {
63, 55, 47, 39, 31, 23, 15,
7, 62, 54, 46, 38, 30, 22,
14, 6, 61, 53, 45, 37, 29,
21, 13, 5, 28, 20, 12, 4,
};
private static final byte[] shifts = { 1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1, };
private static final byte[] PC2_C = {
14, 17, 11, 24, 1, 5,
3, 28, 15, 6, 21, 10,
23, 19, 12, 4, 26, 8,
16, 7, 27, 20, 13, 2,
};
private static final byte[] PC2_D = {
41,52,31,37,47,55,
30,40,51,45,33,48,
44,49,39,56,34,53,
46,42,50,36,29,32,
};
private byte[] C = new byte[28];
private byte[] D = new byte[28];
private byte[] KS;
private byte[] E = new byte[48];
private static final byte[] e2 = {
32, 1, 2, 3, 4, 5,
4, 5, 6, 7, 8, 9,
8, 9,10,11,12,13,
12,13,14,15,16,17,
16,17,18,19,20,21,
20,21,22,23,24,25,
24,25,26,27,28,29,
28,29,30,31,32, 1,
};
private void setkey(byte[] key) {
int i, j, k;
byte t;
if (KS == null) {
KS = new byte[16*48];
}
for (i = 0; i < 28; i++) {
C[i] = key[PC1_C[i]-1];
D[i] = key[PC1_D[i]-1];
}
for (i = 0; i < 16; i++) {
for (k = 0; k < shifts[i]; k++) {
t = C[0];
for (j = 0; j < 28-1; j++)
C[j] = C[j+1];
C[27] = t;
t = D[0];
for (j = 0; j < 28-1; j++)
D[j] = D[j+1];
D[27] = t;
}
for (j = 0; j < 24; j++) {
int index = i * 48;
KS[index+j] = C[PC2_C[j]-1];
KS[index+j+24] = D[PC2_D[j]-28-1];
}
}
for (i = 0; i < 48; i++)
E[i] = e2[i];
}
private static final byte[][] S = {
{14, 4,13, 1, 2,15,11, 8, 3,10, 6,12, 5, 9, 0, 7,
0,15, 7, 4,14, 2,13, 1,10, 6,12,11, 9, 5, 3, 8,
4, 1,14, 8,13, 6, 2,11,15,12, 9, 7, 3,10, 5, 0,
15,12, 8, 2, 4, 9, 1, 7, 5,11, 3,14,10, 0, 6,13},
{15, 1, 8,14, 6,11, 3, 4, 9, 7, 2,13,12, 0, 5,10,
3,13, 4, 7,15, 2, 8,14,12, 0, 1,10, 6, 9,11, 5,
0,14, 7,11,10, 4,13, 1, 5, 8,12, 6, 9, 3, 2,15,
13, 8,10, 1, 3,15, 4, 2,11, 6, 7,12, 0, 5,14, 9},
{10, 0, 9,14, 6, 3,15, 5, 1,13,12, 7,11, 4, 2, 8,
13, 7, 0, 9, 3, 4, 6,10, 2, 8, 5,14,12,11,15, 1,
13, 6, 4, 9, 8,15, 3, 0,11, 1, 2,12, 5,10,14, 7,
1,10,13, 0, 6, 9, 8, 7, 4,15,14, 3,11, 5, 2,12},
{7,13,14, 3, 0, 6, 9,10, 1, 2, 8, 5,11,12, 4,15,
13, 8,11, 5, 6,15, 0, 3, 4, 7, 2,12, 1,10,14, 9,
10, 6, 9, 0,12,11, 7,13,15, 1, 3,14, 5, 2, 8, 4,
3,15, 0, 6,10, 1,13, 8, 9, 4, 5,11,12, 7, 2,14},
{2,12, 4, 1, 7,10,11, 6, 8, 5, 3,15,13, 0,14, 9,
14,11, 2,12, 4, 7,13, 1, 5, 0,15,10, 3, 9, 8, 6,
4, 2, 1,11,10,13, 7, 8,15, 9,12, 5, 6, 3, 0,14,
11, 8,12, 7, 1,14, 2,13, 6,15, 0, 9,10, 4, 5, 3},
{12, 1,10,15, 9, 2, 6, 8, 0,13, 3, 4,14, 7, 5,11,
10,15, 4, 2, 7,12, 9, 5, 6, 1,13,14, 0,11, 3, 8,
9,14,15, 5, 2, 8,12, 3, 7, 0, 4,10, 1,13,11, 6,
4, 3, 2,12, 9, 5,15,10,11,14, 1, 7, 6, 0, 8,13},
{4,11, 2,14,15, 0, 8,13, 3,12, 9, 7, 5,10, 6, 1,
13, 0,11, 7, 4, 9, 1,10,14, 3, 5,12, 2,15, 8, 6,
1, 4,11,13,12, 3, 7,14,10,15, 6, 8, 0, 5, 9, 2,
6,11,13, 8, 1, 4,10, 7, 9, 5, 0,15,14, 2, 3,12},
{13, 2, 8, 4, 6,15,11, 1,10, 9, 3,14, 5, 0,12, 7,
1,15,13, 8,10, 3, 7, 4,12, 5, 6,11, 0,14, 9, 2,
7,11, 4, 1, 9,12,14, 2, 0, 6,10,13,15, 3, 5, 8,
2, 1,14, 7, 4,10, 8,13,15,12, 9, 0, 3, 5, 6,11},
};
private static final byte[] P = {
16, 7,20,21,
29,12,28,17,
1,15,23,26,
5,18,31,10,
2, 8,24,14,
32,27, 3, 9,
19,13,30, 6,
22,11, 4,25,
};
private byte[] L = new byte[64];
private byte[] tempL = new byte[32];
private byte[] f = new byte[32];
private byte[] preS = new byte[48];
private void encrypt(byte[] block,int fake) {
int i;
int t, j, k;
int R = 32; // &L[32]
if (KS == null) {
KS = new byte[16*48];
}
for(j=0; j < 64; j++) {
L[j] = block[IP[j]-1];
}
for(i=0; i < 16; i++) {
int index = i * 48;
for(j=0; j < 32; j++) {
tempL[j] = L[R+j];
}
for(j=0; j < 48; j++) {
preS[j] = (byte) (L[R+E[j]-1] ^ KS[index+j]);
}
for(j=0; j < 8; j++) {
t = 6*j;
k = S[j][(preS[t+0]<<5)+
(preS[t+1]<<3)+
(preS[t+2]<<2)+
(preS[t+3]<<1)+
(preS[t+4]<<0)+
(preS[t+5]<<4)];
t = 4*j;
f[t+0] = (byte) ((k>>3)&01);
f[t+1] = (byte) ((k>>2)&01);
f[t+2] = (byte) ((k>>1)&01);
f[t+3] = (byte) ((k>>0)&01);
}
for(j=0; j < 32; j++) {
L[R+j] = (byte) (L[j] ^ f[P[j]-1]);
}
for(j=0; j < 32; j++) {
L[j] = tempL[j];
}
}
for(j=0; j < 32; j++) {
t = L[j];
L[j] = L[R+j];
L[R+j] = (byte)t;
}
for(j=0; j < 64; j++) {
block[j] = L[FP[j]-1];
}
}
/* EXPORT DELETE END */
/**
* Creates a new Crypt object for use with the crypt method.
*
*/
public Crypt()
{
// does nothing at this time
super();
}
/**
* Implements the libc crypt(3) function.
*
* @param pw the password to "encrypt".
*
* @param salt the salt to use.
*
* @return A new byte[13] array that contains the encrypted
* password. The first two characters are the salt.
*
*/
public synchronized byte[] crypt(byte[] pw, byte[] salt) {
int c, i, j, pwi;
byte temp;
byte[] block = new byte[66];
byte[] iobuf = new byte[13];
/* EXPORT DELETE START */
pwi = 0;
for(i=0; pwi < pw.length && i < 64; pwi++) {
c = pw[pwi];
for(j=0; j < 7; j++, i++) {
block[i] = (byte) ((c>>(6-j)) & 01);
}
i++;
}
setkey(block);
for(i=0; i < 66; i++) {
block[i] = 0;
}
for(i=0; i < 2; i++) {
c = salt[i];
iobuf[i] = (byte)c;
if(c > 'Z')
c -= 6;
if(c > '9')
c -= 7;
c -= '.';
for(j=0; j < 6; j++) {
if( ((c>>j) & 01) != 0) {
temp = E[6*i+j];
E[6*i+j] = E[6*i+j+24];
E[6*i+j+24] = temp;
}
}
}
for(i=0; i < 25; i++) {
encrypt(block,0);
}
for(i=0; i < 11; i++) {
c = 0;
for(j=0; j < 6; j++) {
c <<= 1;
c |= block[6*i+j];
}
c += '.';
if(c > '9') {
c += 7;
}
if(c > 'Z') {
c += 6;
}
iobuf[i+2] = (byte)c;
}
//iobuf[i+2] = 0;
if(iobuf[1] == 0) {
iobuf[1] = iobuf[0];
}
/* EXPORT DELETE END */
return(iobuf);
}
/**
* program to test the crypt routine.
*
* The first parameter is the cleartext password, the second is
* the salt to use. The salt should be two characters from the
* set [a-zA-Z0-9./]. Outputs the crypt result.
*
* @param arg command line arguments.
*
*/
public static void main(String arg[]) {
if (arg.length!=2) {
System.err.println("usage: Crypt password salt");
System.exit(1);
}
Crypt c = new Crypt();
try {
byte result[] = c.crypt
(arg[0].getBytes("ISO-8859-1"), arg[1].getBytes("ISO-8859-1"));
for (int i=0; i<result.length; i++) {
System.out.println(" "+i+" "+(char)result[i]);
}
} catch (java.io.UnsupportedEncodingException uee) {
// cannot happen
}
}
}
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