| 1 |
/* Mixmaster version 3 -- (C) 1999 Anonymizer Inc.
|
| 2 |
|
| 3 |
Mixmaster may be redistributed and modified under certain conditions.
|
| 4 |
This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF
|
| 5 |
ANY KIND, either express or implied. See the file COPYRIGHT for
|
| 6 |
details.
|
| 7 |
|
| 8 |
OpenPGP data
|
| 9 |
$Id: pgpdata.c,v 1.14 2002/09/04 06:40:31 disastry Exp $ */
|
| 10 |
|
| 11 |
|
| 12 |
#include "mix3.h"
|
| 13 |
#ifdef USE_PGP
|
| 14 |
#include "pgp.h"
|
| 15 |
#include "crypto.h"
|
| 16 |
#include <assert.h>
|
| 17 |
#include <time.h>
|
| 18 |
#include <string.h>
|
| 19 |
|
| 20 |
int pgp_keylen(int symalgo)
|
| 21 |
{
|
| 22 |
switch (symalgo) {
|
| 23 |
#ifdef USE_AES
|
| 24 |
case PGP_K_AES256:
|
| 25 |
return (32);
|
| 26 |
case PGP_K_AES192:
|
| 27 |
return (24);
|
| 28 |
case PGP_K_AES128:
|
| 29 |
#endif
|
| 30 |
case PGP_K_IDEA:
|
| 31 |
case PGP_K_CAST5:
|
| 32 |
case PGP_K_BF:
|
| 33 |
return (16);
|
| 34 |
case PGP_K_3DES:
|
| 35 |
return (24);
|
| 36 |
default:
|
| 37 |
return (0);
|
| 38 |
}
|
| 39 |
}
|
| 40 |
|
| 41 |
int pgp_blocklen(int symalgo)
|
| 42 |
{
|
| 43 |
switch (symalgo) {
|
| 44 |
#ifdef USE_AES
|
| 45 |
case PGP_K_AES256:
|
| 46 |
case PGP_K_AES192:
|
| 47 |
case PGP_K_AES128:
|
| 48 |
return (16);
|
| 49 |
#endif
|
| 50 |
case PGP_K_IDEA:
|
| 51 |
case PGP_K_CAST5:
|
| 52 |
case PGP_K_BF:
|
| 53 |
case PGP_K_3DES:
|
| 54 |
return (8);
|
| 55 |
default:
|
| 56 |
return (16);
|
| 57 |
}
|
| 58 |
}
|
| 59 |
|
| 60 |
int mpi_get(BUFFER *b, BUFFER *mpi)
|
| 61 |
{
|
| 62 |
int l;
|
| 63 |
|
| 64 |
l = buf_geti(b);
|
| 65 |
buf_clear(mpi);
|
| 66 |
|
| 67 |
if (l <= 0 || b->ptr + (l + 7) / 8 > b->length)
|
| 68 |
return (-1);
|
| 69 |
buf_get(b, mpi, (l + 7) / 8);
|
| 70 |
return (l);
|
| 71 |
}
|
| 72 |
|
| 73 |
|
| 74 |
int mpi_bitcount(BUFFER *mpi)
|
| 75 |
{
|
| 76 |
int i, l;
|
| 77 |
while (!mpi->data[0] && mpi->length) // remove leading zeros from mpi
|
| 78 |
memmove(mpi->data, mpi->data+1, --mpi->length);
|
| 79 |
l = mpi->length * 8;
|
| 80 |
for (i = 7; i >= 0; i--)
|
| 81 |
if (((mpi->data[0] >> i) & 1) == 1) {
|
| 82 |
l -= 7 - i;
|
| 83 |
break;
|
| 84 |
}
|
| 85 |
return l;
|
| 86 |
}
|
| 87 |
|
| 88 |
int mpi_put(BUFFER *b, BUFFER *mpi)
|
| 89 |
{
|
| 90 |
buf_appendi(b, mpi_bitcount(mpi));
|
| 91 |
buf_cat(b, mpi);
|
| 92 |
return (0);
|
| 93 |
}
|
| 94 |
|
| 95 |
int skcrypt(BUFFER *data, int skalgo, BUFFER *key, BUFFER *iv, int enc)
|
| 96 |
{
|
| 97 |
switch (skalgo) {
|
| 98 |
case 0:
|
| 99 |
return (0);
|
| 100 |
#ifdef USE_IDEA
|
| 101 |
case PGP_K_IDEA:
|
| 102 |
return (buf_ideacrypt(data, key, iv, enc));
|
| 103 |
#endif
|
| 104 |
#ifdef USE_AES
|
| 105 |
case PGP_K_AES128:
|
| 106 |
case PGP_K_AES192:
|
| 107 |
case PGP_K_AES256:
|
| 108 |
return (buf_aescrypt(data, key, iv, enc));
|
| 109 |
#endif
|
| 110 |
case PGP_K_3DES:
|
| 111 |
return (buf_3descrypt(data, key, iv, enc));
|
| 112 |
case PGP_K_BF:
|
| 113 |
return (buf_bfcrypt(data, key, iv, enc));
|
| 114 |
case PGP_K_CAST5:
|
| 115 |
return (buf_castcrypt(data, key, iv, enc));
|
| 116 |
default:
|
| 117 |
return (-1);
|
| 118 |
}
|
| 119 |
}
|
| 120 |
|
| 121 |
int pgp_csum(BUFFER *key, int start)
|
| 122 |
{
|
| 123 |
int i, csum = 0;
|
| 124 |
for (i = start; i < key->length; i++)
|
| 125 |
csum = (csum + key->data[i]) % 65536;
|
| 126 |
return (csum);
|
| 127 |
}
|
| 128 |
|
| 129 |
#ifdef USE_RSA
|
| 130 |
int pgp_rsa(BUFFER *in, BUFFER *k, int mode)
|
| 131 |
{
|
| 132 |
BUFFER *mpi, *out;
|
| 133 |
int err = -1;
|
| 134 |
RSA *key;
|
| 135 |
|
| 136 |
assert(mode == PK_ENCRYPT || mode == PK_VERIFY || mode == PK_DECRYPT
|
| 137 |
|| mode == PK_SIGN);
|
| 138 |
key = RSA_new();
|
| 139 |
out = buf_new();
|
| 140 |
mpi = buf_new();
|
| 141 |
|
| 142 |
mpi_get(k, mpi);
|
| 143 |
key->n = BN_bin2bn(mpi->data, mpi->length, NULL);
|
| 144 |
|
| 145 |
if (mpi_get(k, mpi) < 0)
|
| 146 |
goto end;
|
| 147 |
key->e = BN_bin2bn(mpi->data, mpi->length, NULL);
|
| 148 |
|
| 149 |
if (mode == PK_DECRYPT || mode == PK_SIGN) {
|
| 150 |
if (mpi_get(k, mpi) < 0)
|
| 151 |
goto end;
|
| 152 |
key->d = BN_bin2bn(mpi->data, mpi->length, NULL);
|
| 153 |
|
| 154 |
#if 1
|
| 155 |
/* compute auxiluary parameters */
|
| 156 |
mpi_get(k, mpi); /* PGP'p is SSLeay's q */
|
| 157 |
key->q = BN_bin2bn(mpi->data, mpi->length, NULL);
|
| 158 |
|
| 159 |
mpi_get(k, mpi);
|
| 160 |
key->p = BN_bin2bn(mpi->data, mpi->length, NULL);
|
| 161 |
|
| 162 |
if (mpi_get(k, mpi) < 0)
|
| 163 |
goto end;
|
| 164 |
key->iqmp = BN_bin2bn(mpi->data, mpi->length, NULL);
|
| 165 |
|
| 166 |
{
|
| 167 |
BIGNUM *i;
|
| 168 |
BN_CTX *ctx;
|
| 169 |
|
| 170 |
ctx = BN_CTX_new();
|
| 171 |
i = BN_new();
|
| 172 |
key->dmp1 = BN_new();
|
| 173 |
key->dmq1 = BN_new();
|
| 174 |
|
| 175 |
BN_sub(i, key->p, BN_value_one());
|
| 176 |
BN_mod(key->dmp1, key->d, i, ctx);
|
| 177 |
|
| 178 |
BN_sub(i, key->q, BN_value_one());
|
| 179 |
BN_mod(key->dmq1, key->d, i, ctx);
|
| 180 |
|
| 181 |
BN_free(i);
|
| 182 |
}
|
| 183 |
#endif
|
| 184 |
}
|
| 185 |
buf_prepare(out, RSA_size(key));
|
| 186 |
|
| 187 |
switch (mode) {
|
| 188 |
case PK_ENCRYPT:
|
| 189 |
out->length = RSA_public_encrypt(in->length, in->data, out->data, key,
|
| 190 |
RSA_PKCS1_PADDING);
|
| 191 |
break;
|
| 192 |
case PK_VERIFY:
|
| 193 |
out->length = RSA_public_decrypt(in->length, in->data, out->data, key,
|
| 194 |
RSA_PKCS1_PADDING);
|
| 195 |
break;
|
| 196 |
case PK_SIGN:
|
| 197 |
out->length = RSA_private_encrypt(in->length, in->data, out->data, key,
|
| 198 |
RSA_PKCS1_PADDING);
|
| 199 |
break;
|
| 200 |
case PK_DECRYPT:
|
| 201 |
out->length = RSA_private_decrypt(in->length, in->data, out->data, key,
|
| 202 |
RSA_PKCS1_PADDING);
|
| 203 |
break;
|
| 204 |
}
|
| 205 |
if (out->length == -1)
|
| 206 |
err = -1, out->length = 0;
|
| 207 |
else
|
| 208 |
err = 0;
|
| 209 |
|
| 210 |
buf_move(in, out);
|
| 211 |
end:
|
| 212 |
RSA_free(key);
|
| 213 |
buf_free(out);
|
| 214 |
buf_free(mpi);
|
| 215 |
return (err);
|
| 216 |
}
|
| 217 |
#endif
|
| 218 |
|
| 219 |
/* Contrary to RFC 2440, old PGP versions use this for clearsign only.
|
| 220 |
* If the text is included in the OpenPGP message, the application will
|
| 221 |
* typically provide the text in the proper format (whatever that is);
|
| 222 |
* we use "canonic" format so everybody will be able to read our messages.
|
| 223 |
* In clearsigned messages, trailing whitespace is always ignored.
|
| 224 |
* Detached signatures are the problematic case. For PGP/MIME, we always
|
| 225 |
* escape trailing whitespace as quoted-printable.
|
| 226 |
*/
|
| 227 |
void pgp_sigcanonic(BUFFER *msg)
|
| 228 |
{
|
| 229 |
BUFFER *line, *out;
|
| 230 |
|
| 231 |
out = buf_new();
|
| 232 |
line = buf_new();
|
| 233 |
|
| 234 |
while (buf_getline(msg, line) != -1) {
|
| 235 |
while (line->length > 0 && (line->data[line->length - 1] == ' '
|
| 236 |
#if 0
|
| 237 |
|| line->data[line->length - 1] == '\t'
|
| 238 |
#endif
|
| 239 |
))
|
| 240 |
line->length--;
|
| 241 |
line->data[line->length] = '\0';
|
| 242 |
buf_cat(out, line);
|
| 243 |
buf_appends(out, "\r\n");
|
| 244 |
}
|
| 245 |
buf_move(msg, out);
|
| 246 |
buf_free(out);
|
| 247 |
buf_free(line);
|
| 248 |
}
|
| 249 |
|
| 250 |
static void mpi_bnput(BUFFER *o, BIGNUM *i)
|
| 251 |
{
|
| 252 |
BUFFER *b;
|
| 253 |
|
| 254 |
b = buf_new();
|
| 255 |
buf_prepare(b, BN_num_bytes(i));
|
| 256 |
b->length = BN_bn2bin(i, b->data);
|
| 257 |
mpi_put(o, b);
|
| 258 |
buf_free(b);
|
| 259 |
}
|
| 260 |
|
| 261 |
static void mpi_bnputenc(BUFFER *o, BIGNUM *i, int ska, BUFFER *key,
|
| 262 |
BUFFER *iv)
|
| 263 |
{
|
| 264 |
BUFFER *b;
|
| 265 |
int ivlen = iv->length;
|
| 266 |
|
| 267 |
b = buf_new();
|
| 268 |
buf_prepare(b, BN_num_bytes(i));
|
| 269 |
b->length = BN_bn2bin(i, b->data);
|
| 270 |
buf_appendi(o, mpi_bitcount(b));
|
| 271 |
if (key && key->length) {
|
| 272 |
skcrypt(b, ska, key, iv, ENCRYPT);
|
| 273 |
buf_clear(iv);
|
| 274 |
buf_append(iv, b->data+b->length-ivlen, ivlen);
|
| 275 |
}
|
| 276 |
buf_cat(o, b);
|
| 277 |
buf_free(b);
|
| 278 |
}
|
| 279 |
|
| 280 |
static int getski(BUFFER *p, BUFFER *pass, BUFFER *key, BUFFER *iv)
|
| 281 |
{
|
| 282 |
int skalgo;
|
| 283 |
BUFFER *salt, *temp;
|
| 284 |
|
| 285 |
if (!pass)
|
| 286 |
return(-1);
|
| 287 |
|
| 288 |
salt = buf_new();
|
| 289 |
temp = buf_new();
|
| 290 |
|
| 291 |
skalgo = buf_getc(p);
|
| 292 |
switch (skalgo) {
|
| 293 |
case 0:
|
| 294 |
/* none */
|
| 295 |
goto end;
|
| 296 |
case 255:
|
| 297 |
/* S2K specifier */
|
| 298 |
skalgo = pgp_getsk(p, pass, key);
|
| 299 |
break;
|
| 300 |
default:
|
| 301 |
/* simple */
|
| 302 |
digest_md5(pass, key);
|
| 303 |
break;
|
| 304 |
}
|
| 305 |
|
| 306 |
buf_get(p, iv, pgp_blocklen(skalgo));
|
| 307 |
|
| 308 |
end:
|
| 309 |
buf_free(salt);
|
| 310 |
buf_free(temp);
|
| 311 |
return (skalgo);
|
| 312 |
}
|
| 313 |
|
| 314 |
static void makeski(BUFFER *secret, BUFFER *pass, int remail)
|
| 315 |
{
|
| 316 |
BUFFER *out, *key, *iv;
|
| 317 |
out = buf_new();
|
| 318 |
key = buf_new();
|
| 319 |
iv = buf_new();
|
| 320 |
if (pass == NULL || pass->length == 0 || remail == 2) {
|
| 321 |
buf_appendc(out, 0);
|
| 322 |
buf_cat(out, secret);
|
| 323 |
} else {
|
| 324 |
buf_appendc(out, 255);
|
| 325 |
pgp_makesk(out, key, PGP_K_CAST5, 3, PGP_H_SHA1, pass);
|
| 326 |
buf_setrnd(iv, pgp_blocklen(PGP_K_CAST5));
|
| 327 |
buf_cat(out, iv);
|
| 328 |
skcrypt(secret, PGP_K_CAST5, key, iv, 1);
|
| 329 |
buf_cat(out, secret);
|
| 330 |
}
|
| 331 |
buf_move(secret, out);
|
| 332 |
buf_free(out);
|
| 333 |
buf_free(key);
|
| 334 |
buf_free(iv);
|
| 335 |
}
|
| 336 |
|
| 337 |
int pgp_nummpi(int algo)
|
| 338 |
{
|
| 339 |
switch (algo) {
|
| 340 |
case PGP_ES_RSA:
|
| 341 |
return (2);
|
| 342 |
case PGP_S_DSA:
|
| 343 |
return (4);
|
| 344 |
case PGP_E_ELG:
|
| 345 |
return (3);
|
| 346 |
default:
|
| 347 |
return (0);
|
| 348 |
}
|
| 349 |
}
|
| 350 |
|
| 351 |
int pgp_numsecmpi(int algo)
|
| 352 |
{
|
| 353 |
switch (algo) {
|
| 354 |
case PGP_ES_RSA:
|
| 355 |
return (4);
|
| 356 |
case PGP_S_DSA:
|
| 357 |
return (1);
|
| 358 |
case PGP_E_ELG:
|
| 359 |
return (1);
|
| 360 |
default:
|
| 361 |
return (0);
|
| 362 |
}
|
| 363 |
}
|
| 364 |
|
| 365 |
/* store key's ID in keyid */
|
| 366 |
int pgp_keyid(BUFFER *key, BUFFER *keyid)
|
| 367 |
{
|
| 368 |
BUFFER *i, *k;
|
| 369 |
int version, algo, j, ptr;
|
| 370 |
|
| 371 |
i = buf_new();
|
| 372 |
k = buf_new();
|
| 373 |
|
| 374 |
ptr = key->ptr;
|
| 375 |
key->ptr = 0;
|
| 376 |
switch (version = buf_getc(key)) {
|
| 377 |
case 2:
|
| 378 |
case 3:
|
| 379 |
buf_getl(key);
|
| 380 |
buf_geti(key);
|
| 381 |
buf_getc(key);
|
| 382 |
mpi_get(key, i);
|
| 383 |
break;
|
| 384 |
case 4:
|
| 385 |
buf_appendc(k, version);
|
| 386 |
buf_appendl(k, buf_getl(key));
|
| 387 |
algo = buf_getc(key);
|
| 388 |
buf_appendc(k, algo);
|
| 389 |
if (pgp_nummpi(algo) == 0)
|
| 390 |
buf_rest(k, key); /* works for public keys only */
|
| 391 |
else
|
| 392 |
for (j = 0; j < pgp_nummpi(algo); j++) {
|
| 393 |
mpi_get(key, i);
|
| 394 |
mpi_put(k, i);
|
| 395 |
}
|
| 396 |
buf_clear(i);
|
| 397 |
buf_appendc(i, 0x99);
|
| 398 |
buf_appendi(i, k->length);
|
| 399 |
buf_cat(i, k);
|
| 400 |
digest_sha1(i, i);
|
| 401 |
break;
|
| 402 |
}
|
| 403 |
buf_clear(keyid);
|
| 404 |
buf_append(keyid, i->data + i->length - 8, 8);
|
| 405 |
buf_free(i);
|
| 406 |
buf_free(k);
|
| 407 |
key->ptr = ptr;
|
| 408 |
return(0);
|
| 409 |
}
|
| 410 |
|
| 411 |
static int pgp_iskeyid(BUFFER *key, BUFFER *keyid)
|
| 412 |
{
|
| 413 |
BUFFER *thisid;
|
| 414 |
int ret;
|
| 415 |
|
| 416 |
thisid = buf_new();
|
| 417 |
pgp_keyid(key, thisid);
|
| 418 |
ret = buf_eq(keyid, thisid);
|
| 419 |
buf_free(thisid);
|
| 420 |
return(ret);
|
| 421 |
}
|
| 422 |
|
| 423 |
int pgp_getkey(int mode, int algo, int *psym, int *pmdc, BUFFER *keypacket, BUFFER *key,
|
| 424 |
BUFFER *keyid, BUFFER *userid, BUFFER *pass)
|
| 425 |
{
|
| 426 |
int tempbuf = 0;
|
| 427 |
int keytype = -1, type, j;
|
| 428 |
int thisalgo = 0, version, skalgo;
|
| 429 |
int needsym = 0, symfound = 0, mdcfound = 0;
|
| 430 |
BUFFER *p1, *iv, *sk, *i, *thiskeyid;
|
| 431 |
int ivlen;
|
| 432 |
int csstart;
|
| 433 |
|
| 434 |
p1 = buf_new();
|
| 435 |
i = buf_new();
|
| 436 |
iv = buf_new();
|
| 437 |
sk = buf_new();
|
| 438 |
thiskeyid = buf_new();
|
| 439 |
if (psym)
|
| 440 |
needsym = *psym;
|
| 441 |
if (keypacket == key) {
|
| 442 |
key = buf_new();
|
| 443 |
tempbuf = 1;
|
| 444 |
}
|
| 445 |
if (userid)
|
| 446 |
buf_clear(userid);
|
| 447 |
|
| 448 |
while ((type = pgp_getpacket(keypacket, p1)) > 0) {
|
| 449 |
switch (type) {
|
| 450 |
case PGP_SIG:
|
| 451 |
/* it is assumed that only valid keys have been imported */
|
| 452 |
if (buf_getc(p1) == 4) {
|
| 453 |
if (buf_getc(p1) == PGP_SIG_CERT) {
|
| 454 |
buf_getc(p1);
|
| 455 |
buf_getc(p1);
|
| 456 |
j = buf_geti(p1);
|
| 457 |
j += p1->ptr;
|
| 458 |
while (p1->ptr < j) {
|
| 459 |
int len, type, a;
|
| 460 |
len = buf_getc(p1);
|
| 461 |
if (len > 192 && len < 255)
|
| 462 |
len = (len - 192) * 256 + buf_getc(p1) + 192;
|
| 463 |
else if (len == 255)
|
| 464 |
len = buf_getl(p1);
|
| 465 |
type = buf_getc(p1);
|
| 466 |
if (len)
|
| 467 |
buf_get(p1, i, len-1); // len-1 - exclude type
|
| 468 |
else
|
| 469 |
buf_clear(i);
|
| 470 |
if (type == PGP_SUB_PSYMMETRIC) {
|
| 471 |
while ((a = buf_getc(i)) != -1)
|
| 472 |
if ((a == PGP_K_3DES || a == PGP_K_CAST5 || a == PGP_K_BF
|
| 473 |
#ifdef USE_IDEA
|
| 474 |
|| a == PGP_K_IDEA
|
| 475 |
#endif
|
| 476 |
#ifdef USE_AES
|
| 477 |
|| a == PGP_K_AES128 || a == PGP_K_AES192 || a == PGP_K_AES256
|
| 478 |
#endif
|
| 479 |
) && (a == needsym || needsym == 0)) {
|
| 480 |
symfound = a;
|
| 481 |
break; // while ((a = buf_getc(i)) != -1)
|
| 482 |
} // if ((a == PGP_K_3DES)...
|
| 483 |
} // if (type == PGP_SUB_PSYMMETRIC)
|
| 484 |
else if (type == PGP_SUB_FEATURES) {
|
| 485 |
if ((a = buf_getc(i)) != -1)
|
| 486 |
if (a & 0x01)
|
| 487 |
mdcfound = 1;
|
| 488 |
} // if (type == PGP_SUB_FEATURES)
|
| 489 |
} // while (p1->ptr < j)
|
| 490 |
} // if (buf_getc(p1) == PGP_SIG_CERT)
|
| 491 |
} // if (buf_getc(p1) == 4)
|
| 492 |
break; // switch (type)
|
| 493 |
case PGP_USERID:
|
| 494 |
if (userid)
|
| 495 |
buf_move(userid, p1);
|
| 496 |
break;
|
| 497 |
case PGP_PUBSUBKEY:
|
| 498 |
case PGP_SECSUBKEY:
|
| 499 |
if (keytype != -1 && (mode == PK_SIGN || mode == PK_VERIFY))
|
| 500 |
continue;
|
| 501 |
case PGP_PUBKEY:
|
| 502 |
case PGP_SECKEY:
|
| 503 |
if ((type == PGP_PUBKEY || type == PGP_PUBSUBKEY) &&
|
| 504 |
(mode == PK_DECRYPT || mode == PK_SIGN))
|
| 505 |
continue;
|
| 506 |
keytype = type;
|
| 507 |
version = buf_getc(p1);
|
| 508 |
switch (version) {
|
| 509 |
case 2:
|
| 510 |
case 3:
|
| 511 |
buf_getl(p1); /* created */
|
| 512 |
buf_geti(p1); /* valid */
|
| 513 |
thisalgo = buf_getc(p1);
|
| 514 |
if (thisalgo != PGP_ES_RSA) {
|
| 515 |
keytype = -1;
|
| 516 |
goto end;
|
| 517 |
}
|
| 518 |
symfound = PGP_K_IDEA;
|
| 519 |
mdcfound = 0;
|
| 520 |
break;
|
| 521 |
case 4:
|
| 522 |
buf_appendc(key, version);
|
| 523 |
buf_appendl(key, buf_getl(p1));
|
| 524 |
thisalgo = buf_getc(p1);
|
| 525 |
buf_appendc(key, thisalgo);
|
| 526 |
if (symfound == 0)
|
| 527 |
symfound = PGP_K_3DES; /* default algorithm */
|
| 528 |
break;
|
| 529 |
default:
|
| 530 |
keytype = -1;
|
| 531 |
goto end;
|
| 532 |
}
|
| 533 |
if (algo != PGP_ANY && thisalgo != algo) {
|
| 534 |
keytype = -1;
|
| 535 |
continue;
|
| 536 |
}
|
| 537 |
if (keyid && keyid->length && !pgp_iskeyid(p1, keyid))
|
| 538 |
continue;
|
| 539 |
pgp_keyid(p1, thiskeyid);
|
| 540 |
if (key) {
|
| 541 |
buf_clear(key);
|
| 542 |
for (j = 0; j < pgp_nummpi(thisalgo); j++) {
|
| 543 |
if (mpi_get(p1, i) == -1)
|
| 544 |
goto end;
|
| 545 |
mpi_put(key, i);
|
| 546 |
}
|
| 547 |
if (keytype == PGP_SECKEY || keytype == PGP_SECSUBKEY) {
|
| 548 |
csstart = key->length;
|
| 549 |
skalgo = getski(p1, pass, sk, iv);
|
| 550 |
switch (version) {
|
| 551 |
case 2:
|
| 552 |
case 3:
|
| 553 |
ivlen = pgp_blocklen(skalgo);
|
| 554 |
for (j = 0; j < pgp_numsecmpi(thisalgo); j++) {
|
| 555 |
unsigned char lastb[16];
|
| 556 |
if (mpi_get(p1, i) == -1) {
|
| 557 |
keytype = -1;
|
| 558 |
goto end;
|
| 559 |
}
|
| 560 |
assert(ivlen <= 16);
|
| 561 |
memcpy(lastb, i->data+i->length-ivlen, ivlen);
|
| 562 |
skcrypt(i, skalgo, sk, iv, DECRYPT);
|
| 563 |
buf_clear(iv);
|
| 564 |
buf_append(iv, lastb, ivlen);
|
| 565 |
mpi_put(key, i);
|
| 566 |
}
|
| 567 |
break;
|
| 568 |
case 4:
|
| 569 |
buf_clear(i);
|
| 570 |
buf_rest(i, p1);
|
| 571 |
skcrypt(i, skalgo, sk, iv, DECRYPT);
|
| 572 |
buf_move(p1, i);
|
| 573 |
for (j = 0; j < pgp_numsecmpi(thisalgo); j++) {
|
| 574 |
if (mpi_get(p1, i) == -1) {
|
| 575 |
keytype = PGP_PASS;
|
| 576 |
goto end;
|
| 577 |
}
|
| 578 |
mpi_put(key, i);
|
| 579 |
}
|
| 580 |
break;
|
| 581 |
}
|
| 582 |
if (pgp_csum(key, csstart) != buf_geti(p1)) {
|
| 583 |
keytype = PGP_PASS;
|
| 584 |
goto end;
|
| 585 |
}
|
| 586 |
}
|
| 587 |
}
|
| 588 |
break;
|
| 589 |
default:
|
| 590 |
/* ignore trust packets etc */
|
| 591 |
break;
|
| 592 |
} // switch (type)
|
| 593 |
} // while ((type = pgp_getpacket(keypacket, p1)) > 0)
|
| 594 |
end:
|
| 595 |
if (keyid) buf_set(keyid, thiskeyid);
|
| 596 |
if (tempbuf) {
|
| 597 |
buf_move(keypacket, key);
|
| 598 |
buf_free(key);
|
| 599 |
}
|
| 600 |
buf_free(p1);
|
| 601 |
buf_free(i);
|
| 602 |
buf_free(iv);
|
| 603 |
buf_free(sk);
|
| 604 |
buf_free(thiskeyid);
|
| 605 |
#ifndef USE_RSA
|
| 606 |
if (thisalgo == PGP_ES_RSA)
|
| 607 |
keytype = -1;
|
| 608 |
#endif
|
| 609 |
if (needsym > 0 && symfound != needsym)
|
| 610 |
keytype = -1;
|
| 611 |
else if (psym && *psym == 0)
|
| 612 |
*psym = symfound;
|
| 613 |
if (pmdc)
|
| 614 |
*pmdc = mdcfound;
|
| 615 |
|
| 616 |
return (keytype <= 0 ? keytype : thisalgo);
|
| 617 |
}
|
| 618 |
|
| 619 |
int pgp_makepkpacket(int type, BUFFER *p, BUFFER *outtxt, BUFFER *out,
|
| 620 |
BUFFER *key, BUFFER *pass, time_t *created)
|
| 621 |
{
|
| 622 |
BUFFER *i, *id;
|
| 623 |
char txt[LINELEN], algoid;
|
| 624 |
int version, algo, valid = 0, err = 0;
|
| 625 |
int len, j;
|
| 626 |
struct tm *tc;
|
| 627 |
|
| 628 |
i = buf_new();
|
| 629 |
id = buf_new();
|
| 630 |
|
| 631 |
version = buf_getc(p);
|
| 632 |
buf_clear(key);
|
| 633 |
switch (version) {
|
| 634 |
case 2:
|
| 635 |
case 3:
|
| 636 |
*created = buf_getl(p);
|
| 637 |
valid = buf_geti(p);
|
| 638 |
algo = buf_getc(p);
|
| 639 |
if (algo != PGP_ES_RSA)
|
| 640 |
return(-1);
|
| 641 |
break;
|
| 642 |
case 4:
|
| 643 |
*created = buf_getl(p);
|
| 644 |
algo = buf_getc(p);
|
| 645 |
break;
|
| 646 |
default:
|
| 647 |
return(-1);
|
| 648 |
}
|
| 649 |
|
| 650 |
switch (version) {
|
| 651 |
case 2:
|
| 652 |
case 3:
|
| 653 |
buf_appendc(key, version);
|
| 654 |
buf_appendl(key, *created);
|
| 655 |
buf_appendi(key, valid);
|
| 656 |
buf_appendc(key, algo);
|
| 657 |
break;
|
| 658 |
case 4:
|
| 659 |
buf_appendc(key, version);
|
| 660 |
buf_appendl(key, *created);
|
| 661 |
buf_appendc(key, algo);
|
| 662 |
break;
|
| 663 |
}
|
| 664 |
|
| 665 |
pgp_keyid(p, id);
|
| 666 |
len = mpi_get(p, i);
|
| 667 |
mpi_put(key, i);
|
| 668 |
for (j = 1; j < pgp_nummpi(algo); j++) {
|
| 669 |
if (mpi_get(p, i) == -1) {
|
| 670 |
err = -1;
|
| 671 |
goto end;
|
| 672 |
}
|
| 673 |
mpi_put(key, i);
|
| 674 |
}
|
| 675 |
pgp_packet(key, type);
|
| 676 |
buf_cat(out, key);
|
| 677 |
|
| 678 |
if (outtxt != NULL) {
|
| 679 |
switch(algo) {
|
| 680 |
case PGP_ES_RSA:
|
| 681 |
algoid = 'R';
|
| 682 |
break;
|
| 683 |
case PGP_S_DSA:
|
| 684 |
algoid = 'D';
|
| 685 |
break;
|
| 686 |
case PGP_E_ELG:
|
| 687 |
algoid = 'g';
|
| 688 |
break;
|
| 689 |
default:
|
| 690 |
algoid = '?';
|
| 691 |
}
|
| 692 |
buf_appendf(outtxt, "%s %4d%c/%02X%02X%02X%02X ",
|
| 693 |
type == PGP_PUBSUBKEY ? "sub" :
|
| 694 |
type == PGP_PUBKEY ? "pub" :
|
| 695 |
type == PGP_SECKEY ? "sec" :
|
| 696 |
type == PGP_SECSUBKEY ? "ssb" :
|
| 697 |
"???", len, algoid,
|
| 698 |
id->data[4], id->data[5], id->data[6], id->data[7]);
|
| 699 |
tc = localtime(created);
|
| 700 |
strftime(txt, LINELEN, "%Y/%m/%d ", tc);
|
| 701 |
buf_appends(outtxt, txt);
|
| 702 |
}
|
| 703 |
end:
|
| 704 |
buf_free(i);
|
| 705 |
buf_free(id);
|
| 706 |
return(err == 0 ? algo : err);
|
| 707 |
}
|
| 708 |
|
| 709 |
int pgp_makepubkey(BUFFER *keypacket, BUFFER *outtxt, BUFFER *out,
|
| 710 |
BUFFER *pass, int keyalgo)
|
| 711 |
{
|
| 712 |
BUFFER *p, *pubkey, *seckey, *subkey, *sig, *tmp;
|
| 713 |
int err = -1, type, thisalgo;
|
| 714 |
time_t created;
|
| 715 |
|
| 716 |
p = buf_new();
|
| 717 |
seckey = buf_new();
|
| 718 |
pubkey = buf_new();
|
| 719 |
subkey = buf_new();
|
| 720 |
sig = buf_new();
|
| 721 |
tmp = buf_new();
|
| 722 |
|
| 723 |
buf_set(seckey, keypacket);
|
| 724 |
type = pgp_getpacket(keypacket, p);
|
| 725 |
if (type != PGP_SECKEY)
|
| 726 |
goto end;
|
| 727 |
|
| 728 |
thisalgo = pgp_makepkpacket(PGP_PUBKEY, p, outtxt, tmp, pubkey, pass,
|
| 729 |
&created);
|
| 730 |
if (thisalgo == -1 || (keyalgo != 0 && keyalgo != thisalgo))
|
| 731 |
goto end;
|
| 732 |
buf_cat(out, tmp);
|
| 733 |
|
| 734 |
while ((type = pgp_getpacket(keypacket, p)) > 0) {
|
| 735 |
if (type == PGP_SECSUBKEY) {
|
| 736 |
if (pgp_makepkpacket(PGP_PUBSUBKEY, p, outtxt, out, subkey, pass,
|
| 737 |
&created) == -1)
|
| 738 |
goto end;
|
| 739 |
if (pgp_sign(pubkey, subkey, sig, NULL, pass, PGP_SIG_BINDSUBKEY, 0,
|
| 740 |
created, 0, seckey, NULL) != -1)
|
| 741 |
buf_cat(out, sig);
|
| 742 |
if (outtxt)
|
| 743 |
buf_nl(outtxt);
|
| 744 |
} else if (type == PGP_USERID) {
|
| 745 |
if (outtxt != NULL) {
|
| 746 |
buf_cat(outtxt, p);
|
| 747 |
buf_nl(outtxt);
|
| 748 |
}
|
| 749 |
pgp_packet(p, PGP_USERID);
|
| 750 |
err = pgp_sign(pubkey, p, sig, NULL, pass, PGP_SIG_CERT, 1, created, 0,
|
| 751 |
seckey, NULL);
|
| 752 |
buf_cat(out, p);
|
| 753 |
if (err == 0)
|
| 754 |
buf_cat(out, sig);
|
| 755 |
} else if (type == PGP_PUBKEY || type == PGP_SECKEY)
|
| 756 |
break;
|
| 757 |
}
|
| 758 |
end:
|
| 759 |
buf_free(pubkey);
|
| 760 |
buf_free(seckey);
|
| 761 |
buf_free(subkey);
|
| 762 |
buf_free(sig);
|
| 763 |
buf_free(p);
|
| 764 |
buf_free(tmp);
|
| 765 |
return (err);
|
| 766 |
}
|
| 767 |
|
| 768 |
int pgp_makeseckey(BUFFER *keypacket, BUFFER *outtxt,
|
| 769 |
BUFFER *pass, int keyalgo)
|
| 770 |
{
|
| 771 |
BUFFER *p, *pubkey, *seckey, *subkey, *sig, *tmp, *dummy;
|
| 772 |
int type, thisalgo, err = -1;
|
| 773 |
time_t created;
|
| 774 |
|
| 775 |
p = buf_new();
|
| 776 |
seckey = buf_new();
|
| 777 |
pubkey = buf_new();
|
| 778 |
subkey = buf_new();
|
| 779 |
sig = buf_new();
|
| 780 |
tmp = buf_new();
|
| 781 |
dummy = buf_new();
|
| 782 |
|
| 783 |
buf_set(seckey, keypacket);
|
| 784 |
type = pgp_getpacket(keypacket, p);
|
| 785 |
if (type != PGP_SECKEY)
|
| 786 |
goto end;
|
| 787 |
|
| 788 |
thisalgo = pgp_makepkpacket(PGP_SECKEY, p, outtxt, tmp, pubkey, pass,
|
| 789 |
&created);
|
| 790 |
if (thisalgo == -1 || (keyalgo != 0 && keyalgo != thisalgo))
|
| 791 |
goto end;
|
| 792 |
|
| 793 |
while ((type = pgp_getpacket(keypacket, p)) > 0) {
|
| 794 |
if (type == PGP_SECSUBKEY) {
|
| 795 |
if (pgp_makepkpacket(PGP_SECSUBKEY, p, outtxt, dummy, subkey, pass,
|
| 796 |
&created) == -1)
|
| 797 |
goto end;
|
| 798 |
buf_nl(outtxt);
|
| 799 |
} else if (type == PGP_USERID) {
|
| 800 |
buf_cat(outtxt, p);
|
| 801 |
buf_nl(outtxt);
|
| 802 |
pgp_packet(p, PGP_USERID);
|
| 803 |
} else if (type == PGP_PUBKEY || type == PGP_SECKEY)
|
| 804 |
break;
|
| 805 |
}
|
| 806 |
err = 0;
|
| 807 |
end:
|
| 808 |
buf_free(pubkey);
|
| 809 |
buf_free(seckey);
|
| 810 |
buf_free(subkey);
|
| 811 |
buf_free(sig);
|
| 812 |
buf_free(p);
|
| 813 |
buf_free(dummy);
|
| 814 |
buf_free(tmp);
|
| 815 |
return (err);
|
| 816 |
}
|
| 817 |
|
| 818 |
#ifdef USE_RSA
|
| 819 |
int pgp_rsakeygen(int bits, BUFFER *userid, BUFFER *pass, char *pubring,
|
| 820 |
char *secring, int remail)
|
| 821 |
/* remail==2: encrypt the secring */
|
| 822 |
{
|
| 823 |
RSA *k;
|
| 824 |
KEYRING *keydb;
|
| 825 |
BUFFER *pkey, *skey;
|
| 826 |
BUFFER *dk, *sig, *iv, *p;
|
| 827 |
long now;
|
| 828 |
int skalgo = 0;
|
| 829 |
int err = 0;
|
| 830 |
|
| 831 |
pkey = buf_new();
|
| 832 |
skey = buf_new();
|
| 833 |
iv = buf_new();
|
| 834 |
dk = buf_new();
|
| 835 |
p = buf_new();
|
| 836 |
sig = buf_new();
|
| 837 |
|
| 838 |
errlog(NOTICE, "Generating OpenPGP RSA key.\n");
|
| 839 |
k = RSA_generate_key(bits == 0 ? 1024 : bits, 17, NULL, NULL);
|
| 840 |
if (k == NULL) {
|
| 841 |
err = -1;
|
| 842 |
goto end;
|
| 843 |
}
|
| 844 |
now = time(NULL);
|
| 845 |
if (remail) /* fake time in nym keys */
|
| 846 |
now -= rnd_number(4 * 24 * 60 * 60);
|
| 847 |
|
| 848 |
buf_appendc(skey, 3);
|
| 849 |
buf_appendl(skey, now);
|
| 850 |
buf_appendi(skey, KEYLIFETIME/(24*60*60));
|
| 851 |
buf_appendc(skey, PGP_ES_RSA);
|
| 852 |
mpi_bnput(skey, k->n);
|
| 853 |
mpi_bnput(skey, k->e);
|
| 854 |
|
| 855 |
#ifdef USE_IDEA
|
| 856 |
if (pass != NULL && pass->length > 0 && remail != 2) {
|
| 857 |
skalgo = PGP_K_IDEA;
|
| 858 |
digest_md5(pass, dk);
|
| 859 |
buf_setrnd(iv, pgp_blocklen(skalgo));
|
| 860 |
buf_appendc(skey, skalgo);
|
| 861 |
buf_cat(skey, iv);
|
| 862 |
}
|
| 863 |
else
|
| 864 |
#endif
|
| 865 |
buf_appendc(skey, 0);
|
| 866 |
|
| 867 |
mpi_bnputenc(skey, k->d, skalgo, dk, iv);
|
| 868 |
mpi_bnputenc(skey, k->q, skalgo, dk, iv);
|
| 869 |
mpi_bnputenc(skey, k->p, skalgo, dk, iv);
|
| 870 |
mpi_bnputenc(skey, k->iqmp, skalgo, dk, iv);
|
| 871 |
|
| 872 |
buf_clear(p);
|
| 873 |
mpi_bnput(p, k->d);
|
| 874 |
mpi_bnput(p, k->q);
|
| 875 |
mpi_bnput(p, k->p);
|
| 876 |
mpi_bnput(p, k->iqmp);
|
| 877 |
buf_appendi(skey, pgp_csum(p, 0));
|
| 878 |
|
| 879 |
pgp_packet(skey, PGP_SECKEY);
|
| 880 |
buf_set(p, userid);
|
| 881 |
pgp_packet(p, PGP_USERID);
|
| 882 |
buf_cat(skey, p);
|
| 883 |
|
| 884 |
if (secring == NULL)
|
| 885 |
secring = PGPREMSECRING;
|
| 886 |
keydb = pgpdb_open(secring, remail == 2 ? pass : NULL, 1);
|
| 887 |
if (keydb == NULL) {
|
| 888 |
err = -1;
|
| 889 |
goto end;
|
| 890 |
}
|
| 891 |
if (keydb->filetype == -1)
|
| 892 |
keydb->filetype = ARMORED;
|
| 893 |
pgpdb_append(keydb, skey);
|
| 894 |
pgpdb_close(keydb);
|
| 895 |
|
| 896 |
if (pubring != NULL) {
|
| 897 |
if (pgp_makepubkey(skey, NULL, pkey, pass, 0) == -1)
|
| 898 |
goto end;
|
| 899 |
keydb = pgpdb_open(pubring, NULL, 1);
|
| 900 |
if (keydb == NULL)
|
| 901 |
goto end;
|
| 902 |
if (keydb->filetype == -1)
|
| 903 |
keydb->filetype = ARMORED;
|
| 904 |
pgpdb_append(keydb, pkey);
|
| 905 |
pgpdb_close(keydb);
|
| 906 |
}
|
| 907 |
end:
|
| 908 |
RSA_free(k);
|
| 909 |
buf_free(pkey);
|
| 910 |
buf_free(skey);
|
| 911 |
buf_free(iv);
|
| 912 |
buf_free(dk);
|
| 913 |
buf_free(p);
|
| 914 |
buf_free(sig);
|
| 915 |
return (err);
|
| 916 |
}
|
| 917 |
#endif
|
| 918 |
|
| 919 |
#define begin_param "-----BEGIN PUBLIC PARAMETER BLOCK-----"
|
| 920 |
#define end_param "-----END PUBLIC PARAMETER BLOCK-----"
|
| 921 |
|
| 922 |
static void *params(int dsa, int bits)
|
| 923 |
{
|
| 924 |
DSA *k = NULL;
|
| 925 |
DH *d = NULL;
|
| 926 |
FILE *f;
|
| 927 |
BUFFER *p, *n;
|
| 928 |
char line[LINELEN];
|
| 929 |
byte b[1024];
|
| 930 |
int m, l;
|
| 931 |
|
| 932 |
if (bits == 0)
|
| 933 |
bits = 1024;
|
| 934 |
if (dsa && bits > 1024)
|
| 935 |
bits = 1024;
|
| 936 |
|
| 937 |
p = buf_new();
|
| 938 |
n = buf_new();
|
| 939 |
f = mix_openfile(dsa ? DSAPARAMS : DHPARAMS, "r");
|
| 940 |
if (f != NULL) {
|
| 941 |
for (;;) {
|
| 942 |
if (fgets(line, sizeof(line), f) == NULL)
|
| 943 |
break;
|
| 944 |
if (strleft(line, begin_param)) {
|
| 945 |
if (fgets(line, sizeof(line), f) == NULL)
|
| 946 |
break;
|
| 947 |
m = 0;
|
| 948 |
sscanf(line, "%d", &m);
|
| 949 |
if (bits == m) {
|
| 950 |
buf_clear(p);
|
| 951 |
while (fgets(line, sizeof(line), f) != NULL) {
|
| 952 |
if (strleft(line, end_param)) {
|
| 953 |
decode(p, p);
|
| 954 |
if (dsa) {
|
| 955 |
k = DSA_new();
|
| 956 |
l = buf_geti(p);
|
| 957 |
buf_get(p, n, l);
|
| 958 |
k->p = BN_bin2bn(n->data, n->length, NULL);
|
| 959 |
l = buf_geti(p);
|
| 960 |
buf_get(p, n, l);
|
| 961 |
k->q = BN_bin2bn(n->data, n->length, NULL);
|
| 962 |
l = buf_geti(p);
|
| 963 |
buf_get(p, n, l);
|
| 964 |
k->g = BN_bin2bn(n->data, n->length, NULL);
|
| 965 |
} else {
|
| 966 |
d = DH_new();
|
| 967 |
l = buf_geti(p);
|
| 968 |
buf_get(p, n, l);
|
| 969 |
d->p = BN_bin2bn(n->data, n->length, NULL);
|
| 970 |
l = buf_geti(p);
|
| 971 |
buf_get(p, n, l);
|
| 972 |
d->g = BN_bin2bn(n->data, n->length, NULL);
|
| 973 |
}
|
| 974 |
break;
|
| 975 |
}
|
| 976 |
buf_appends(p, line);
|
| 977 |
}
|
| 978 |
}
|
| 979 |
}
|
| 980 |
}
|
| 981 |
fclose(f);
|
| 982 |
}
|
| 983 |
|
| 984 |
buf_free(p);
|
| 985 |
buf_free(n);
|
| 986 |
|
| 987 |
if (dsa) {
|
| 988 |
if (k == NULL) {
|
| 989 |
errlog(NOTICE, "Generating DSA parameters.\n");
|
| 990 |
k = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL);
|
| 991 |
p = buf_new();
|
| 992 |
l = BN_bn2bin(k->p, b);
|
| 993 |
buf_appendi(p, l);
|
| 994 |
buf_append(p, b, l);
|
| 995 |
l = BN_bn2bin(k->q, b);
|
| 996 |
buf_appendi(p, l);
|
| 997 |
buf_append(p, b, l);
|
| 998 |
l = BN_bn2bin(k->g, b);
|
| 999 |
buf_appendi(p, l);
|
| 1000 |
buf_append(p, b, l);
|
| 1001 |
encode(p, 64);
|
| 1002 |
f = mix_openfile(DSAPARAMS, "a");
|
| 1003 |
fprintf(f, "%s\n%d\n", begin_param, bits);
|
| 1004 |
buf_write(p, f);
|
| 1005 |
fprintf(f, "%s\n", end_param);
|
| 1006 |
fclose(f);
|
| 1007 |
buf_free(p);
|
| 1008 |
}
|
| 1009 |
return (k);
|
| 1010 |
} else {
|
| 1011 |
if (d == NULL) {
|
| 1012 |
errlog(NOTICE, "Generating DH parameters. (This may take a long time!)\n");
|
| 1013 |
d = DH_generate_parameters(bits, DH_GENERATOR_5, NULL, NULL);
|
| 1014 |
p = buf_new();
|
| 1015 |
l = BN_bn2bin(d->p, b);
|
| 1016 |
buf_appendi(p, l);
|
| 1017 |
buf_append(p, b, l);
|
| 1018 |
l = BN_bn2bin(d->g, b);
|
| 1019 |
buf_appendi(p, l);
|
| 1020 |
buf_append(p, b, l);
|
| 1021 |
encode(p, 64);
|
| 1022 |
f = mix_openfile(DHPARAMS, "a");
|
| 1023 |
fprintf(f, "%s\n%d\n", begin_param, bits);
|
| 1024 |
buf_write(p, f);
|
| 1025 |
fprintf(f, "%s\n", end_param);
|
| 1026 |
fclose(f);
|
| 1027 |
buf_free(p);
|
| 1028 |
}
|
| 1029 |
return (d);
|
| 1030 |
}
|
| 1031 |
}
|
| 1032 |
|
| 1033 |
int pgp_dhkeygen(int bits, BUFFER *userid, BUFFER *pass, char *pubring,
|
| 1034 |
char *secring, int remail)
|
| 1035 |
/* remail==2: encrypt the secring */
|
| 1036 |
{
|
| 1037 |
DSA *s;
|
| 1038 |
DH *e;
|
| 1039 |
KEYRING *keydb;
|
| 1040 |
BUFFER *pkey, *skey, *subkey, *secret;
|
| 1041 |
BUFFER *dk, *sig, *iv, *p;
|
| 1042 |
long now;
|
| 1043 |
int err = 0;
|
| 1044 |
|
| 1045 |
pkey = buf_new();
|
| 1046 |
skey = buf_new();
|
| 1047 |
subkey = buf_new();
|
| 1048 |
iv = buf_new();
|
| 1049 |
dk = buf_new();
|
| 1050 |
p = buf_new();
|
| 1051 |
sig = buf_new();
|
| 1052 |
secret = buf_new();
|
| 1053 |
|
| 1054 |
s = params(1, bits);
|
| 1055 |
errlog(NOTICE, "Generating OpenPGP DSA key.\n");
|
| 1056 |
if (s == NULL || DSA_generate_key(s) != 1) {
|
| 1057 |
err = -1;
|
| 1058 |
goto end;
|
| 1059 |
}
|
| 1060 |
e = params(0, bits);
|
| 1061 |
errlog(NOTICE, "Generating OpenPGP ElGamal key.\n");
|
| 1062 |
if (e == NULL || DH_generate_key(e) != 1) {
|
| 1063 |
err = -1;
|
| 1064 |
goto end;
|
| 1065 |
}
|
| 1066 |
|
| 1067 |
now = time(NULL);
|
| 1068 |
if (remail) /* fake time in nym keys */
|
| 1069 |
now -= rnd_number(4 * 24 * 60 * 60);
|
| 1070 |
|
| 1071 |
/* DSA key */
|
| 1072 |
buf_setc(skey, 4);
|
| 1073 |
buf_appendl(skey, now);
|
| 1074 |
buf_appendc(skey, PGP_S_DSA);
|
| 1075 |
mpi_bnput(skey, s->p);
|
| 1076 |
mpi_bnput(skey, s->q);
|
| 1077 |
mpi_bnput(skey, s->g);
|
| 1078 |
mpi_bnput(skey, s->pub_key);
|
| 1079 |
|
| 1080 |
mpi_bnput(secret, s->priv_key);
|
| 1081 |
buf_appendi(secret, pgp_csum(secret, 0));
|
| 1082 |
makeski(secret, pass, remail);
|
| 1083 |
buf_cat(skey, secret);
|
| 1084 |
pgp_packet(skey, PGP_SECKEY);
|
| 1085 |
|
| 1086 |
/* ElGamal key */
|
| 1087 |
buf_setc(subkey, 4);
|
| 1088 |
buf_appendl(subkey, now);
|
| 1089 |
buf_appendc(subkey, PGP_E_ELG);
|
| 1090 |
mpi_bnput(subkey, e->p);
|
| 1091 |
mpi_bnput(subkey, e->g);
|
| 1092 |
mpi_bnput(subkey, e->pub_key);
|
| 1093 |
|
| 1094 |
buf_clear(secret);
|
| 1095 |
mpi_bnput(secret, e->priv_key);
|
| 1096 |
buf_appendi(secret, pgp_csum(secret, 0));
|
| 1097 |
makeski(secret, pass, remail);
|
| 1098 |
buf_cat(subkey, secret);
|
| 1099 |
|
| 1100 |
buf_set(p, userid);
|
| 1101 |
pgp_packet(p, PGP_USERID);
|
| 1102 |
buf_cat(skey, p);
|
| 1103 |
|
| 1104 |
pgp_packet(subkey, PGP_SECSUBKEY);
|
| 1105 |
buf_cat(skey, subkey);
|
| 1106 |
|
| 1107 |
if (secring == NULL)
|
| 1108 |
secring = PGPREMSECRING;
|
| 1109 |
keydb = pgpdb_open(secring, remail == 2 ? pass : NULL, 1);
|
| 1110 |
if (keydb == NULL) {
|
| 1111 |
err = -1;
|
| 1112 |
goto end;
|
| 1113 |
}
|
| 1114 |
if (keydb->filetype == -1)
|
| 1115 |
keydb->filetype = ARMORED;
|
| 1116 |
pgpdb_append(keydb, skey);
|
| 1117 |
pgpdb_close(keydb);
|
| 1118 |
|
| 1119 |
if (pubring != NULL) {
|
| 1120 |
pgp_makepubkey(skey, NULL, pkey, pass, 0);
|
| 1121 |
keydb = pgpdb_open(pubring, NULL, 1);
|
| 1122 |
if (keydb == NULL)
|
| 1123 |
goto end;
|
| 1124 |
if (keydb->filetype == -1)
|
| 1125 |
keydb->filetype = ARMORED;
|
| 1126 |
pgpdb_append(keydb, pkey);
|
| 1127 |
pgpdb_close(keydb);
|
| 1128 |
}
|
| 1129 |
end:
|
| 1130 |
buf_free(pkey);
|
| 1131 |
buf_free(skey);
|
| 1132 |
buf_free(subkey);
|
| 1133 |
buf_free(iv);
|
| 1134 |
buf_free(dk);
|
| 1135 |
buf_free(p);
|
| 1136 |
buf_free(sig);
|
| 1137 |
buf_free(secret);
|
| 1138 |
return (err);
|
| 1139 |
}
|
| 1140 |
|
| 1141 |
int pgp_dsasign(BUFFER *data, BUFFER *key, BUFFER *out)
|
| 1142 |
{
|
| 1143 |
BUFFER *mpi, *b;
|
| 1144 |
DSA *d;
|
| 1145 |
DSA_SIG *sig = NULL;
|
| 1146 |
|
| 1147 |
d = DSA_new();
|
| 1148 |
b = buf_new();
|
| 1149 |
mpi = buf_new();
|
| 1150 |
mpi_get(key, mpi);
|
| 1151 |
d->p = BN_bin2bn(mpi->data, mpi->length, NULL);
|
| 1152 |
mpi_get(key, mpi);
|
| 1153 |
d->q = BN_bin2bn(mpi->data, mpi->length, NULL);
|
| 1154 |
mpi_get(key, mpi);
|
| 1155 |
d->g = BN_bin2bn(mpi->data, mpi->length, NULL);
|
| 1156 |
mpi_get(key, mpi);
|
| 1157 |
d->pub_key = BN_bin2bn(mpi->data, mpi->length, NULL);
|
| 1158 |
if (mpi_get(key, mpi) == -1) {
|
| 1159 |
goto end;
|
| 1160 |
}
|
| 1161 |
d->priv_key = BN_bin2bn(mpi->data, mpi->length, NULL);
|
| 1162 |
|
| 1163 |
sig = DSA_do_sign(data->data, data->length, d);
|
| 1164 |
if (sig) {
|
| 1165 |
buf_prepare(b, BN_num_bytes(sig->r));
|
| 1166 |
b->length = BN_bn2bin(sig->r, b->data);
|
| 1167 |
mpi_put(out, b);
|
| 1168 |
b->length = BN_bn2bin(sig->s, b->data);
|
| 1169 |
mpi_put(out, b);
|
| 1170 |
}
|
| 1171 |
end:
|
| 1172 |
buf_free(mpi);
|
| 1173 |
buf_free(b);
|
| 1174 |
DSA_SIG_free(sig);
|
| 1175 |
DSA_free(d);
|
| 1176 |
return(sig ? 0 : -1);
|
| 1177 |
}
|
| 1178 |
|
| 1179 |
int pgp_dosign(int algo, BUFFER *data, BUFFER *key)
|
| 1180 |
{
|
| 1181 |
int err;
|
| 1182 |
BUFFER *out, *r, *s;
|
| 1183 |
|
| 1184 |
out = buf_new();
|
| 1185 |
r = buf_new();
|
| 1186 |
s = buf_new();
|
| 1187 |
switch (algo) {
|
| 1188 |
#ifdef USE_RSA
|
| 1189 |
case PGP_ES_RSA:
|
| 1190 |
err = pgp_rsa(data, key, PK_SIGN);
|
| 1191 |
if (err == 0)
|
| 1192 |
mpi_put(out, data);
|
| 1193 |
break;
|
| 1194 |
#endif
|
| 1195 |
case PGP_S_DSA:
|
| 1196 |
err = pgp_dsasign(data, key, out);
|
| 1197 |
break;
|
| 1198 |
default:
|
| 1199 |
errlog(NOTICE, "Unknown encryption algorithm!\n");
|
| 1200 |
return (-1);
|
| 1201 |
}
|
| 1202 |
if (err == -1)
|
| 1203 |
errlog(ERRORMSG, "Signing operation failed!\n");
|
| 1204 |
|
| 1205 |
buf_move(data, out);
|
| 1206 |
buf_free(out);
|
| 1207 |
buf_free(r);
|
| 1208 |
buf_free(s);
|
| 1209 |
return (err);
|
| 1210 |
}
|
| 1211 |
|
| 1212 |
int pgp_elgdecrypt(BUFFER *in, BUFFER *key)
|
| 1213 |
{
|
| 1214 |
BIGNUM *a = NULL, *b = NULL, *c = NULL,
|
| 1215 |
*p = NULL, *g = NULL, *x = NULL;
|
| 1216 |
BN_CTX *ctx;
|
| 1217 |
BUFFER *i;
|
| 1218 |
int err = -1;
|
| 1219 |
|
| 1220 |
i = buf_new();
|
| 1221 |
ctx = BN_CTX_new();
|
| 1222 |
if (ctx == NULL) goto end;
|
| 1223 |
mpi_get(key, i);
|
| 1224 |
p = BN_bin2bn(i->data, i->length, NULL);
|
| 1225 |
mpi_get(key, i);
|
| 1226 |
g = BN_bin2bn(i->data, i->length, NULL);
|
| 1227 |
mpi_get(key, i); /* y */
|
| 1228 |
mpi_get(key, i);
|
| 1229 |
x = BN_bin2bn(i->data, i->length, NULL);
|
| 1230 |
mpi_get(in, i);
|
| 1231 |
a = BN_bin2bn(i->data, i->length, NULL);
|
| 1232 |
if (mpi_get(in, i) == -1)
|
| 1233 |
goto e1;
|
| 1234 |
b = BN_bin2bn(i->data, i->length, NULL);
|
| 1235 |
c = BN_new();
|
| 1236 |
|
| 1237 |
if (BN_mod_exp(c, a, x, p, ctx) == 0) goto end;
|
| 1238 |
if (BN_mod_inverse(a, c, p, ctx) == 0) goto end;
|
| 1239 |
if (BN_mod_mul(c, a, b, p, ctx) == 0) goto end;
|
| 1240 |
|
| 1241 |
buf_prepare(i, BN_num_bytes(c));
|
| 1242 |
i->length = BN_bn2bin(c, i->data);
|
| 1243 |
|
| 1244 |
buf_prepare(in, BN_num_bytes(c));
|
| 1245 |
in->length = RSA_padding_check_PKCS1_type_2(in->data, in->length, i->data,
|
| 1246 |
i->length, i->length + 1);
|
| 1247 |
if (in->length <= 0)
|
| 1248 |
in->length = 0;
|
| 1249 |
else
|
| 1250 |
err = 0;
|
| 1251 |
|
| 1252 |
end:
|
| 1253 |
BN_free(b);
|
| 1254 |
BN_free(c);
|
| 1255 |
e1:
|
| 1256 |
buf_free(i);
|
| 1257 |
BN_free(a);
|
| 1258 |
BN_free(p);
|
| 1259 |
BN_free(g);
|
| 1260 |
BN_clear_free(x);
|
| 1261 |
BN_CTX_free(ctx);
|
| 1262 |
|
| 1263 |
return (err);
|
| 1264 |
}
|
| 1265 |
|
| 1266 |
int pgp_elgencrypt(BUFFER *in, BUFFER *key)
|
| 1267 |
{
|
| 1268 |
BIGNUM *m, *k, *a, *b, *c, *p, *g, *y = NULL;
|
| 1269 |
BN_CTX *ctx;
|
| 1270 |
BUFFER *i;
|
| 1271 |
int err = -1;
|
| 1272 |
|
| 1273 |
i = buf_new();
|
| 1274 |
ctx = BN_CTX_new();
|
| 1275 |
if (ctx == NULL) goto end;
|
| 1276 |
mpi_get(key, i);
|
| 1277 |
p = BN_bin2bn(i->data, i->length, NULL);
|
| 1278 |
mpi_get(key, i);
|
| 1279 |
g = BN_bin2bn(i->data, i->length, NULL);
|
| 1280 |
if (mpi_get(key, i) == -1)
|
| 1281 |
goto e1;
|
| 1282 |
y = BN_bin2bn(i->data, i->length, NULL);
|
| 1283 |
|
| 1284 |
buf_prepare(i, BN_num_bytes(p));
|
| 1285 |
if (RSA_padding_add_PKCS1_type_2(i->data, i->length, in->data, in->length)
|
| 1286 |
!= 1)
|
| 1287 |
goto end;
|
| 1288 |
m = BN_bin2bn(i->data, i->length, NULL);
|
| 1289 |
|
| 1290 |
k = BN_new();
|
| 1291 |
BN_rand(k, BN_num_bits(p), 0, 0);
|
| 1292 |
|
| 1293 |
a = BN_new();
|
| 1294 |
b = BN_new();
|
| 1295 |
c = BN_new();
|
| 1296 |
|
| 1297 |
if (BN_mod_exp(a, g, k, p, ctx) == 0) goto end;
|
| 1298 |
if (BN_mod_exp(c, y, k, p, ctx) == 0) goto end;
|
| 1299 |
if (BN_mod_mul(b, m, c, p, ctx) == 0) goto end;
|
| 1300 |
|
| 1301 |
buf_clear(in);
|
| 1302 |
i->length = BN_bn2bin(a, i->data);
|
| 1303 |
mpi_put(in, i);
|
| 1304 |
i->length = BN_bn2bin(b, i->data);
|
| 1305 |
mpi_put(in, i);
|
| 1306 |
|
| 1307 |
err = 0;
|
| 1308 |
|
| 1309 |
BN_free(a);
|
| 1310 |
BN_free(b);
|
| 1311 |
BN_free(c);
|
| 1312 |
BN_free(m);
|
| 1313 |
e1:
|
| 1314 |
buf_free(i);
|
| 1315 |
BN_free(p);
|
| 1316 |
BN_free(g);
|
| 1317 |
BN_free(y);
|
| 1318 |
BN_CTX_free(ctx);
|
| 1319 |
end:
|
| 1320 |
|
| 1321 |
return (err);
|
| 1322 |
}
|
| 1323 |
|
| 1324 |
#endif /* USE_PGP */
|
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