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/*
* generate printable key IDs
* Copyright (C) 2002 Henry Spencer.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Library General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/lgpl.txt>.
*
* This library 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 Library General Public
* License for more details.
*
* RCSID $Id: keyblobtoid.c,v 1.1 2004/03/15 20:35:26 as Exp $
*/
#include "internal.h"
#include "freeswan.h"
/*
- keyblobtoid - generate a printable key ID from an RFC 2537/3110 key blob
* Current algorithm is just to use first nine base64 digits.
*/
size_t
keyblobtoid(src, srclen, dst, dstlen)
const unsigned char *src;
size_t srclen;
char *dst; /* need not be valid if dstlen is 0 */
size_t dstlen;
{
char buf[KEYID_BUF];
size_t ret;
# define NDIG 9
if (srclen < (NDIG*6 + 7)/8) {
strcpy(buf, "?len= ?");
buf[5] = '0' + srclen;
ret = 0;
} else {
(void) datatot(src, srclen, 64, buf, NDIG+1);
ret = NDIG+1;
}
if (dstlen > 0) {
if (strlen(buf)+1 > dstlen)
*(buf + dstlen - 1) = '\0';
strcpy(dst, buf);
}
return ret;
}
/*
- splitkeytoid - generate a printable key ID from exponent/modulus pair
* Just constructs the beginnings of a key blob and calls keyblobtoid().
*/
size_t
splitkeytoid(e, elen, m, mlen, dst, dstlen)
const unsigned char *e;
size_t elen;
const unsigned char *m;
size_t mlen;
char *dst; /* need not be valid if dstlen is 0 */
size_t dstlen;
{
unsigned char buf[KEYID_BUF]; /* ample room */
unsigned char *bufend = buf + sizeof(buf);
unsigned char *p;
size_t n;
p = buf;
if (elen <= 255)
*p++ = elen;
else if ((elen &~ 0xffff) == 0) {
*p++ = 0;
*p++ = (elen>>8) & 0xff;
*p++ = elen & 0xff;
} else
return 0; /* unrepresentable exponent length */
n = bufend - p;
if (elen < n)
n = elen;
memcpy(p, e, n);
p += n;
n = bufend - p;
if (n > 0) {
if (mlen < n)
n = mlen;
memcpy(p, m, n);
p += n;
}
return keyblobtoid(buf, p - buf, dst, dstlen);
}
#ifdef KEYBLOBTOID_MAIN
#include <stdio.h>
void regress();
int
main(argc, argv)
int argc;
char *argv[];
{
typedef unsigned char uc;
uc hexblob[] = "\x01\x03\x85\xf2\xd6\x76\x9b\x03\x59\xb6\x21\x52";
uc hexe[] = "\x03";
uc hexm[] = "\x85\xf2\xd6\x76\x9b\x03\x59\xb6\x21\x52\xef\x85";
char b64nine[] = "AQOF8tZ2m";
char b64six[] = "AQOF8t";
char buf[100];
size_t n;
char *b = b64nine;
size_t bl = strlen(b) + 1;
int st = 0;
n = keyblobtoid(hexblob, strlen(hexblob), buf, sizeof(buf));
if (n != bl) {
fprintf(stderr, "%s: keyblobtoid returned %d not %d\n",
argv[0], n, bl);
st = 1;
}
if (strcmp(buf, b) != 0) {
fprintf(stderr, "%s: keyblobtoid generated `%s' not `%s'\n",
argv[0], buf, b);
st = 1;
}
n = splitkeytoid(hexe, strlen(hexe), hexm, strlen(hexm), buf,
sizeof(buf));
if (n != bl) {
fprintf(stderr, "%s: splitkeytoid returned %d not %d\n",
argv[0], n, bl);
st = 1;
}
if (strcmp(buf, b) != 0) {
fprintf(stderr, "%s: splitkeytoid generated `%s' not `%s'\n",
argv[0], buf, b);
st = 1;
}
exit(st);
}
#endif /* KEYBLOBTOID_MAIN */
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