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LCrypt.c
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C/C++ Source or Header
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1986-11-21
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449 lines
/**********************************************************************
*
* LCrypt.c 03/06/88
*
* Original cipher code lifted, almost verbatim, from LUCIFER.C
* by R.W. Outerbridge. I'm not sure that this code is copyrighted,
* no mention of it's status was present in the orginal source file.
*
* The original MS-DOS source was aquired from the Cryptography BBS,
* (703) 237-4322 McLean VA.
*
* Command line interface code by Jack Radigan. This code is
* is free of any restrictions, You are free to include and/or
* modifiy for your use in any program, commercial or otherwise.
*
* A one line blurb of credit in your source would be nice though...
*
* Compiled with Aztec C vers. 3.40a
*
***********************************************************************/
#include <stdio.h>
#define toascii(a) ((a)&0177)
#define EN 0
#define DE 1
typedef char BYTE;
int IOedf, End, Once, crypt_flag;
char output[132], dir[35], temp[132], *rindex();
BYTE Block[16], Link[16], Temp[16], IV[16], Last[16];
BYTE DFLTKY[16] = { 1,35,69,103,137,171,205,239,254,220,186,152,118,84,50,16 };
FILE *fp_in, *fp_out;
main(argc, argv)
int argc;
char **argv;
{
int c, i, j, k, count;
char *filename, *s, *fn[500];
char *scdir(), *malloc();
BYTE kv[16];
printf("LCrypt 1.0 1988 by Jack Radigan\n");
if(*argv[1] == '?')
help();
if(argc < 3)
useage_error();
crypt_flag = EN;
if(strlen(argv[1]) == 1) {
if(*argv[1] != 'e' && *argv[1] != 'E' && *argv[1] != 'd' &&
*argv[1] != 'D')
useage_error();
if(*argv[1] == 'd' || *argv[1] == 'D')
crypt_flag = DE;
argv++;
argc--;
}
if(*argv[1] == '-') {
strcpy(dir, argv[1] + 1);
if(dir[strlen(dir) - 1] != ':' && dir[strlen(dir) - 1] != '/') {
printf("Illegal directory specification!\n");
exit(0);
}
argv++;
argc--;
}
getkey(argv[1], kv);
j = 0;
printf("Creating file list,");
fflush(stdout);
for(i = 2; i < argc; i++) {
strcpy(temp, argv[i]);
if(crypt_flag)
if(strcmp(temp + strlen(temp) - 3, ".lu"))
strcat(temp, ".lu");
while((filename = scdir(temp)) && j < 500) {
fn[j] = malloc(strlen(filename) + 1);
strcpy(fn[j++], filename);
}
}
printf(" %d files found.\n", j);
for(i = 0; i < j; i++) {
strcpy(output, fn[i]);
if((fp_in = fopen(output, "r")) == NULL) {
printf("Unable to open input file.\n");
continue;
}
if((fp_out = fopen("ram:LCrypt.tmp", "w")) == NULL) {
fclose(fp_in);
printf("Unable to open temporary file in ram:, exiting.\n");
exit(0);
}
printf("%s ", output);
fflush(stdout);
loadkey(kv, crypt_flag);
initio(crypt_flag);
while(get16(Block) != EOF) {
lucifer(Block);
put16(Block);
}
fclose(fp_in);
fclose(fp_out);
strcpy(temp, dir);
if(s = rindex(output, '/'))
s++;
else if(s = rindex(output, ':'))
s++;
else
s = output;
strcat(temp, s);
if((fp_in = fopen("ram:LCrypt.tmp", "r")) == NULL)
continue;
if((fp_out = fopen(temp, "w")) == NULL) {
fclose(fp_in);
exit(0);
}
count = 0;
while((c = fgetc(fp_in)) != EOF) {
fputc(c, fp_out);
count++;
}
fclose(fp_in);
fclose(fp_out);
if((fp_in = fopen("ram:LCrypt.tmp", "w")) == NULL)
continue;
for(k = 0; k <= count; k++)
fputc('\0', fp_in);
fclose(fp_in);
strcpy(output, temp);
if(crypt_flag) {
output[strlen(output) - 3] = '\0';
Rename(temp, output);
printf("decrypted.\n");
}
else {
strcat(output, ".lu");
Rename(temp, output);
printf("encrypted.\n");
}
}
DeleteFile("ram:LCrypt.tmp");
printf("LCrypt finished.\n");
}
useage_error()
{
printf("Usage: LCrypt [de] [-directory] key filename [filename...]\n");
printf(" LCrypt ? for help.\n\n");
exit(0);
}
help()
{
printf("Usage: LCrypt [de] [-directory] key filename [filename...]\n\n");
printf(" d - decrypt file.\n");
printf(" e - encrypt file. [default mode]\n");
printf(" -directory - optional directory for output, include\n");
printf(" trailing ':' or '/' for a sub-directory.\n");
printf(" key - delimit with quotes if spaces are used.\n");
printf(" filename - wildcards '?' and '*' can be used. AmigaDOS\n");
printf(" style wildcards are not supported.\n");
exit(0);
}
copy16(from, to)
register BYTE *from, *to;
{
register int i;
for(i = 0; i < 16; i++)
to[i] = from[i];
return;
}
xor16(to, with)
register BYTE *to, *with;
{
register int i;
for(i = 0; i < 16; i++)
to[i] ^= with[i];
return;
}
put16(block)
register BYTE *block;
{
if(IOedf == DE)
copy16(block, Last);
else
vraiput(block, &block[16]);
return;
}
get16(input)
register BYTE *input;
{
register int i, j;
if(End == 1)
return(EOF); /* no more input */
for(i=0; i < 16 && ((j = fgetc(fp_in)) != EOF); i++)
*input++ = j;
if(IOedf == DE) { /* DECRYPTION */
/* complete block? pending output? */
if(i == 16 && (Once > 0))
vraiput(Last, &Last[16]);
else if(j == EOF) {
End = 1;
if(Once > 0) {
/* incomplete block means no nulls */
if(i != 0)
i = 0;
else {
i = Last[15]&0377;
if(i > 16)
i = 0; /* huh? */
}
vraiput(Last, &Last[16-i]);
}
return(EOF);
}
}
else if(j == EOF) { /* ENCRYPTION */
End = 1;
if(i == 0 && (IOedf == EN || (Once > 0))) {
/* if no padding to do, print a kludge */
if(IOedf == EN && (Once > 0))
fputc('0', fp_out);
return(EOF);
}
for(j=i; j < 15; j++)
*input++ = NULL;
*input = 16-i;
}
Once = 1;
return(0);
}
getkey(aptr, kptr)
register BYTE *aptr;
register BYTE *kptr;
{
register BYTE *store;
register int i, first;
BYTE hold[16];
first = 1;
loadkey(DFLTKY, EN);
copy16(DFLTKY, hold);
while(*aptr || first) {
store = kptr;
for(i=0; i<16 && (*aptr != NULL); i++) {
*store++ = toascii(*aptr);
*aptr++ = NULL;
}
while(i++ < 16)
*store++ = NULL;
xor16(kptr, hold);
lucifer(kptr);
copy16(kptr, hold);
first = 0;
}
return;
}
vraiput(cp, ep)
register BYTE *cp, *ep;
{
while(cp < ep)
fputc((BYTE)*cp++, fp_out);
return;
}
initio(edf)
int edf;
{
IOedf = edf;
End = Once = 0;
return;
}
/* LUCIFER is a cryptographic algorithm developed by IBM in the early
* seventies. It was a predecessor of the DES, and is much simpler
* than that algorithm. In particular, it has only two substitution
* boxes. It does, however, use a 128 bit key and operates on
* sixteen byte data blocks...
*
* This implementation of LUCIFER was crafted by Graven Cyphers at the
* University of Toronto, Canada, with programming assistance from
* Richard Outerbridge. It is based on the FORTRAN routines which
* concluded Arthur Sorkin's article "LUCIFER: A Cryptographic Algorithm",
* CRYPTOLOGIA, Volume 8, Number 1, January 1984, pp22-42. The interested
* reader should refer to that article rather than this program for more
* details on LUCIFER.
*
* These routines bear little resemblance to the actual LUCIFER algorithm,
* which has been severely twisted in the interests of speed. They do
* perform the same transformations, and are believed to be UNIX portable.
* The package was developed for use on UNIX-like systems lacking crypto
* facilities. They are not very fast, but the cipher is very strong.
* The routines in this file are suitable for use as a subroutine library
* after the fashion of crypt(3). When linked together with applications
* routines they can also provide a high-level cryptographic system.
*
* -DENHANCE : modify LUCIFER by changing the key schedule and performing
* an "autokeyed" encryption. These may improve the algorithm.
*/
static BYTE Dps[64] = { /* Diffusion Pattern schedule */
4,16,32,2,1,8,64,128, 128,4,16,32,2,1,8,64,
64,128,4,16,32,2,1,8, 8,64,128,4,16,32,2,1,
1,8,64,128,4,16,32,2, 2,1,8,64,128,4,16,32,
32,2,1,8,64,128,4,16, 16,32,2,1,8,64,128,4 };
/* Precomputed S&P Boxes, Two Varieties */
static BYTE TCB0[256] = {
87, 21,117, 54, 23, 55, 20, 84,116,118, 22, 53, 85,119, 52, 86,
223,157,253,190,159,191,156,220,252,254,158,189,221,255,188,222,
207,141,237,174,143,175,140,204,236,238,142,173,205,239,172,206,
211,145,241,178,147,179,144,208,240,242,146,177,209,243,176,210,
215,149,245,182,151,183,148,212,244,246,150,181,213,247,180,214,
95, 29,125, 62, 31, 63, 28, 92,124,126, 30, 61, 93,127, 60, 94,
219,153,249,186,155,187,152,216,248,250,154,185,217,251,184,218,
67, 1, 97, 34, 3, 35, 0, 64, 96, 98, 2, 33, 65, 99, 32, 66,
195,129,225,162,131,163,128,192,224,226,130,161,193,227,160,194,
199,133,229,166,135,167,132,196,228,230,134,165,197,231,164,198,
203,137,233,170,139,171,136,200,232,234,138,169,201,235,168,202,
75, 9,105, 42, 11, 43, 8, 72,104,106, 10, 41, 73,107, 40, 74,
91, 25,121, 58, 27, 59, 24, 88,120,122, 26, 57, 89,123, 56, 90,
71, 5,101, 38, 7, 39, 4, 68,100,102, 6, 37, 69,103, 36, 70,
79, 13,109, 46, 15, 47, 12, 76,108,110, 14, 45, 77,111, 44, 78,
83, 17,113, 50, 19, 51, 16, 80,112,114, 18, 49, 81,115, 48, 82 };
static BYTE TCB1[256] = {
87,223,207,211,215, 95,219, 67,195,199,203, 75, 91, 71, 79, 83,
21,157,141,145,149, 29,153, 1,129,133,137, 9, 25, 5, 13, 17,
117,253,237,241,245,125,249, 97,225,229,233,105,121,101,109,113,
54,190,174,178,182, 62,186, 34,162,166,170, 42, 58, 38, 46, 50,
23,159,143,147,151, 31,155, 3,131,135,139, 11, 27, 7, 15, 19,
55,191,175,179,183, 63,187, 35,163,167,171, 43, 59, 39, 47, 51,
20,156,140,144,148, 28,152, 0,128,132,136, 8, 24, 4, 12, 16,
84,220,204,208,212, 92,216, 64,192,196,200, 72, 88, 68, 76, 80,
116,252,236,240,244,124,248, 96,224,228,232,104,120,100,108,112,
118,254,238,242,246,126,250, 98,226,230,234,106,122,102,110,114,
22,158,142,146,150, 30,154, 2,130,134,138, 10, 26, 6, 14, 18,
53,189,173,177,181, 61,185, 33,161,165,169, 41, 57, 37, 45, 49,
85,221,205,209,213, 93,217, 65,193,197,201, 73, 89, 69, 77, 81,
119,255,239,243,247,127,251, 99,227,231,235,107,123,103,111,115,
52,188,172,176,180, 60,184, 32,160,164,168, 40, 56, 36, 44, 48,
86,222,206,210,214, 94,218, 66,194,198,202, 74, 90, 70, 78, 82 };
static BYTE Key[16], Pkey[128];
static int P[8] = { 3,5,0,4,2,1,7,6 };
static int Smask[16] = { 128,64,32,16,8,4,2,1 };
lucifer(bytes)
BYTE *bytes; /* points to a 16-byte array */
{
register BYTE *cp, *sp, *dp;
register int val, *sbs, tcb, j, i;
BYTE *h0, *h1, *kc, *ks;
h0 = bytes; /* the "lower" half */
h1 = bytes + 8; /* the "upper" half */
kc = Pkey;
ks = Key;
for(i=0; i<16; i++) {
tcb = *ks++;
sbs = Smask;
dp = Dps;
sp = &h0[8];
for(j=0; j<8; j++) {
if(tcb&*sbs++) val = TCB1[h1[j]&0377];
else val = TCB0[h1[j]&0377];
val ^= *kc++;
for(cp=h0; cp<sp;) *cp++ ^= (val&*dp++);
}
/* swap (virtual) halves */
cp = h0;
h0 = h1;
h1 = cp;
}
/* REALLY swap halves */
dp = bytes;
cp = bytes + 8;
for(sp=cp; dp<sp; dp++, cp++) {
val = *dp;
*dp = *cp;
*cp = val;
}
return;
}
loadkey(keystr, edf) /* precomputes the key schedules */
BYTE *keystr;
register int edf;
{
register BYTE *ep, *cp, *pp;
register int kc, i, j;
BYTE kk[16], pk[16];
cp = kk;
pp = pk;
ep = &kk[16];
while(cp < ep) {
*cp++ = *keystr;
for(*pp=i=0; i<8; i++)
if(*keystr&Smask[i]) *pp |= Smask[P[i]];
keystr++;
pp++;
}
cp = Key;
pp = Pkey;
kc = (edf == DE) ? 8 : 0;
for(i=0; i<16; i++) {
if(edf == DE) kc = (++kc)&017;
*cp++ = kk[kc];
for(j=0; j<8; j++) {
*pp++ = pk[kc];
if(j<7 || (edf == DE)) kc = (++kc)&017;
}
}
return;
}