Bug Summary

File:src/lib/libcrypto/pem/pvkfmt.c
Warning:line 682, column 3
Value stored to 'length' is never read

Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.4 -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name pvkfmt.c -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 1 -pic-is-pie -mframe-pointer=all -relaxed-aliasing -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/lib/libcrypto/obj -resource-dir /usr/local/llvm16/lib/clang/16 -D LIBRESSL_INTERNAL -D HAVE_FUNOPEN -I /usr/src/lib/libcrypto -I /usr/src/lib/libcrypto/arch/amd64 -I /usr/src/lib/libcrypto/asn1 -I /usr/src/lib/libcrypto/bio -I /usr/src/lib/libcrypto/bn -I /usr/src/lib/libcrypto/bn/arch/amd64 -I /usr/src/lib/libcrypto/bytestring -I /usr/src/lib/libcrypto/curve25519 -I /usr/src/lib/libcrypto/dh -I /usr/src/lib/libcrypto/dsa -I /usr/src/lib/libcrypto/ec -I /usr/src/lib/libcrypto/ecdsa -I /usr/src/lib/libcrypto/evp -I /usr/src/lib/libcrypto/hidden -I /usr/src/lib/libcrypto/hmac -I /usr/src/lib/libcrypto/kdf -I /usr/src/lib/libcrypto/modes -I /usr/src/lib/libcrypto/ocsp -I /usr/src/lib/libcrypto/pkcs12 -I /usr/src/lib/libcrypto/rsa -I /usr/src/lib/libcrypto/sha -I /usr/src/lib/libcrypto/ts -I /usr/src/lib/libcrypto/x509 -I /usr/src/lib/libcrypto/obj -D AES_ASM -D BSAES_ASM -D VPAES_ASM -D OPENSSL_IA32_SSE2 -D RSA_ASM -D OPENSSL_BN_ASM_MONT -D OPENSSL_BN_ASM_MONT5 -D MD5_ASM -D GHASH_ASM -D RC4_MD5_ASM -D SHA1_ASM -D SHA256_ASM -D SHA512_ASM -D WHIRLPOOL_ASM -D OPENSSL_CPUID_OBJ -internal-isystem /usr/local/llvm16/lib/clang/16/include -internal-externc-isystem /usr/include -O2 -fdebug-compilation-dir=/usr/src/lib/libcrypto/obj -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fcf-protection=branch -fno-jump-tables -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/scan/2024-01-11-140451-98009-1 -x c /usr/src/lib/libcrypto/pem/pvkfmt.c
1/* $OpenBSD: pvkfmt.c,v 1.27 2023/07/07 13:40:44 beck Exp $ */
2/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3 * project 2005.
4 */
5/* ====================================================================
6 * Copyright (c) 2005 The OpenSSL Project. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58
59/* Support for PVK format keys and related structures (such a PUBLICKEYBLOB
60 * and PRIVATEKEYBLOB).
61 */
62
63#include <stdlib.h>
64#include <string.h>
65
66#include <openssl/opensslconf.h>
67
68#include <openssl/bn.h>
69#include <openssl/err.h>
70#include <openssl/pem.h>
71
72#if !defined(OPENSSL_NO_RSA) && !defined(OPENSSL_NO_DSA)
73#include <openssl/dsa.h>
74#include <openssl/rsa.h>
75
76#include "bn_local.h"
77#include "dsa_local.h"
78#include "evp_local.h"
79#include "rsa_local.h"
80
81/* Utility function: read a DWORD (4 byte unsigned integer) in little endian
82 * format
83 */
84
85static unsigned int
86read_ledword(const unsigned char **in)
87{
88 const unsigned char *p = *in;
89 unsigned int ret;
90
91 ret = *p++;
92 ret |= (*p++ << 8);
93 ret |= (*p++ << 16);
94 ret |= (*p++ << 24);
95 *in = p;
96 return ret;
97}
98
99/* Read a BIGNUM in little endian format. The docs say that this should take up
100 * bitlen/8 bytes.
101 */
102
103static int
104read_lebn(const unsigned char **in, unsigned int nbyte, BIGNUM **r)
105{
106 const unsigned char *p;
107 unsigned char *tmpbuf, *q;
108 unsigned int i;
109
110 p = *in + nbyte - 1;
111 tmpbuf = malloc(nbyte);
112 if (!tmpbuf)
113 return 0;
114 q = tmpbuf;
115 for (i = 0; i < nbyte; i++)
116 *q++ = *p--;
117 *r = BN_bin2bn(tmpbuf, nbyte, NULL((void *)0));
118 free(tmpbuf);
119 if (*r) {
120 *in += nbyte;
121 return 1;
122 } else
123 return 0;
124}
125
126
127/* Convert private key blob to EVP_PKEY: RSA and DSA keys supported */
128
129#define MS_PUBLICKEYBLOB0x6 0x6
130#define MS_PRIVATEKEYBLOB0x7 0x7
131#define MS_RSA1MAGIC0x31415352L 0x31415352L
132#define MS_RSA2MAGIC0x32415352L 0x32415352L
133#define MS_DSS1MAGIC0x31535344L 0x31535344L
134#define MS_DSS2MAGIC0x32535344L 0x32535344L
135
136#define MS_KEYALG_RSA_KEYX0xa400 0xa400
137#define MS_KEYALG_DSS_SIGN0x2200 0x2200
138
139#define MS_KEYTYPE_KEYX0x1 0x1
140#define MS_KEYTYPE_SIGN0x2 0x2
141
142/* The PVK file magic number: seems to spell out "bobsfile", who is Bob? */
143#define MS_PVKMAGIC0xb0b5f11eL 0xb0b5f11eL
144/* Salt length for PVK files */
145#define PVK_SALTLEN0x10 0x10
146
147static EVP_PKEY *b2i_rsa(const unsigned char **in, unsigned int length,
148 unsigned int bitlen, int ispub);
149static EVP_PKEY *b2i_dss(const unsigned char **in, unsigned int length,
150 unsigned int bitlen, int ispub);
151
152static int
153do_blob_header(const unsigned char **in, unsigned int length,
154 unsigned int *pmagic, unsigned int *pbitlen, int *pisdss, int *pispub)
155{
156 const unsigned char *p = *in;
157
158 if (length < 16)
159 return 0;
160 /* bType */
161 if (*p == MS_PUBLICKEYBLOB0x6) {
162 if (*pispub == 0) {
163 PEMerror(PEM_R_EXPECTING_PRIVATE_KEY_BLOB)ERR_put_error(9,(0xfff),(119),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,163);
164 return 0;
165 }
166 *pispub = 1;
167 } else if (*p == MS_PRIVATEKEYBLOB0x7) {
168 if (*pispub == 1) {
169 PEMerror(PEM_R_EXPECTING_PUBLIC_KEY_BLOB)ERR_put_error(9,(0xfff),(120),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,169);
170 return 0;
171 }
172 *pispub = 0;
173 } else
174 return 0;
175 p++;
176 /* Version */
177 if (*p++ != 0x2) {
178 PEMerror(PEM_R_BAD_VERSION_NUMBER)ERR_put_error(9,(0xfff),(117),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,178);
179 return 0;
180 }
181 /* Ignore reserved, aiKeyAlg */
182 p += 6;
183 *pmagic = read_ledword(&p);
184 *pbitlen = read_ledword(&p);
185 if (*pbitlen > 65536) {
186 PEMerror(PEM_R_INCONSISTENT_HEADER)ERR_put_error(9,(0xfff),(121),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,186);
187 return 0;
188 }
189 *pisdss = 0;
190 switch (*pmagic) {
191
192 case MS_DSS1MAGIC0x31535344L:
193 *pisdss = 1;
194 case MS_RSA1MAGIC0x31415352L:
195 if (*pispub == 0) {
196 PEMerror(PEM_R_EXPECTING_PRIVATE_KEY_BLOB)ERR_put_error(9,(0xfff),(119),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,196);
197 return 0;
198 }
199 break;
200
201 case MS_DSS2MAGIC0x32535344L:
202 *pisdss = 1;
203 case MS_RSA2MAGIC0x32415352L:
204 if (*pispub == 1) {
205 PEMerror(PEM_R_EXPECTING_PUBLIC_KEY_BLOB)ERR_put_error(9,(0xfff),(120),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,205);
206 return 0;
207 }
208 break;
209
210 default:
211 PEMerror(PEM_R_BAD_MAGIC_NUMBER)ERR_put_error(9,(0xfff),(116),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,211);
212 return -1;
213 }
214 *in = p;
215 return 1;
216}
217
218static unsigned int
219blob_length(unsigned bitlen, int isdss, int ispub)
220{
221 unsigned int nbyte, hnbyte;
222
223 nbyte = (bitlen + 7) >> 3;
224 hnbyte = (bitlen + 15) >> 4;
225 if (isdss) {
226
227 /* Expected length: 20 for q + 3 components bitlen each + 24
228 * for seed structure.
229 */
230 if (ispub)
231 return 44 + 3 * nbyte;
232 /* Expected length: 20 for q, priv, 2 bitlen components + 24
233 * for seed structure.
234 */
235 else
236 return 64 + 2 * nbyte;
237 } else {
238 /* Expected length: 4 for 'e' + 'n' */
239 if (ispub)
240 return 4 + nbyte;
241 else
242 /* Expected length: 4 for 'e' and 7 other components.
243 * 2 components are bitlen size, 5 are bitlen/2
244 */
245 return 4 + 2*nbyte + 5*hnbyte;
246 }
247
248}
249
250static EVP_PKEY *
251do_b2i(const unsigned char **in, unsigned int length, int ispub)
252{
253 const unsigned char *p = *in;
254 unsigned int bitlen, magic;
255 int isdss;
256
257 if (do_blob_header(&p, length, &magic, &bitlen, &isdss, &ispub) <= 0) {
258 PEMerror(PEM_R_KEYBLOB_HEADER_PARSE_ERROR)ERR_put_error(9,(0xfff),(122),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,258);
259 return NULL((void *)0);
260 }
261 length -= 16;
262 if (length < blob_length(bitlen, isdss, ispub)) {
263 PEMerror(PEM_R_KEYBLOB_TOO_SHORT)ERR_put_error(9,(0xfff),(123),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,263);
264 return NULL((void *)0);
265 }
266 if (isdss)
267 return b2i_dss(&p, length, bitlen, ispub);
268 else
269 return b2i_rsa(&p, length, bitlen, ispub);
270}
271
272static EVP_PKEY *
273do_b2i_bio(BIO *in, int ispub)
274{
275 const unsigned char *p;
276 unsigned char hdr_buf[16], *buf = NULL((void *)0);
277 unsigned int bitlen, magic, length;
278 int isdss;
279 EVP_PKEY *ret = NULL((void *)0);
280
281 if (BIO_read(in, hdr_buf, 16) != 16) {
282 PEMerror(PEM_R_KEYBLOB_TOO_SHORT)ERR_put_error(9,(0xfff),(123),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,282);
283 return NULL((void *)0);
284 }
285 p = hdr_buf;
286 if (do_blob_header(&p, 16, &magic, &bitlen, &isdss, &ispub) <= 0)
287 return NULL((void *)0);
288
289 length = blob_length(bitlen, isdss, ispub);
290 buf = malloc(length);
291 if (!buf) {
292 PEMerror(ERR_R_MALLOC_FAILURE)ERR_put_error(9,(0xfff),((1|64)),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,292);
293 goto err;
294 }
295 p = buf;
296 if (BIO_read(in, buf, length) != (int)length) {
297 PEMerror(PEM_R_KEYBLOB_TOO_SHORT)ERR_put_error(9,(0xfff),(123),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,297);
298 goto err;
299 }
300
301 if (isdss)
302 ret = b2i_dss(&p, length, bitlen, ispub);
303 else
304 ret = b2i_rsa(&p, length, bitlen, ispub);
305
306 err:
307 free(buf);
308 return ret;
309}
310
311static EVP_PKEY *
312b2i_dss(const unsigned char **in, unsigned int length, unsigned int bitlen,
313 int ispub)
314{
315 const unsigned char *p = *in;
316 EVP_PKEY *ret = NULL((void *)0);
317 DSA *dsa = NULL((void *)0);
318 BN_CTX *ctx = NULL((void *)0);
319 unsigned int nbyte;
320
321 nbyte = (bitlen + 7) >> 3;
322
323 dsa = DSA_new();
324 ret = EVP_PKEY_new();
325 if (!dsa || !ret)
326 goto err;
327 if (!read_lebn(&p, nbyte, &dsa->p))
328 goto err;
329 if (!read_lebn(&p, 20, &dsa->q))
330 goto err;
331 if (!read_lebn(&p, nbyte, &dsa->g))
332 goto err;
333 if (ispub) {
334 if (!read_lebn(&p, nbyte, &dsa->pub_key))
335 goto err;
336 } else {
337 if (!read_lebn(&p, 20, &dsa->priv_key))
338 goto err;
339 /* Calculate public key */
340 if (!(dsa->pub_key = BN_new()))
341 goto err;
342 if (!(ctx = BN_CTX_new()))
343 goto err;
344 if (!BN_mod_exp_ct(dsa->pub_key, dsa->g,
345 dsa->priv_key, dsa->p, ctx))
346 goto err;
347 BN_CTX_free(ctx);
348 }
349
350 EVP_PKEY_set1_DSA(ret, dsa);
351 DSA_free(dsa);
352 *in = p;
353 return ret;
354
355 err:
356 PEMerror(ERR_R_MALLOC_FAILURE)ERR_put_error(9,(0xfff),((1|64)),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,356);
357 DSA_free(dsa);
358 EVP_PKEY_free(ret);
359 BN_CTX_free(ctx);
360 return NULL((void *)0);
361}
362
363static EVP_PKEY *
364b2i_rsa(const unsigned char **in, unsigned int length, unsigned int bitlen,
365 int ispub)
366{
367 const unsigned char *p = *in;
368 EVP_PKEY *ret = NULL((void *)0);
369 RSA *rsa = NULL((void *)0);
370 unsigned int nbyte, hnbyte;
371
372 nbyte = (bitlen + 7) >> 3;
373 hnbyte = (bitlen + 15) >> 4;
374 rsa = RSA_new();
375 ret = EVP_PKEY_new();
376 if (!rsa || !ret)
377 goto err;
378 rsa->e = BN_new();
379 if (!rsa->e)
380 goto err;
381 if (!BN_set_word(rsa->e, read_ledword(&p)))
382 goto err;
383 if (!read_lebn(&p, nbyte, &rsa->n))
384 goto err;
385 if (!ispub) {
386 if (!read_lebn(&p, hnbyte, &rsa->p))
387 goto err;
388 if (!read_lebn(&p, hnbyte, &rsa->q))
389 goto err;
390 if (!read_lebn(&p, hnbyte, &rsa->dmp1))
391 goto err;
392 if (!read_lebn(&p, hnbyte, &rsa->dmq1))
393 goto err;
394 if (!read_lebn(&p, hnbyte, &rsa->iqmp))
395 goto err;
396 if (!read_lebn(&p, nbyte, &rsa->d))
397 goto err;
398 }
399
400 EVP_PKEY_set1_RSA(ret, rsa);
401 RSA_free(rsa);
402 *in = p;
403 return ret;
404
405 err:
406 PEMerror(ERR_R_MALLOC_FAILURE)ERR_put_error(9,(0xfff),((1|64)),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,406);
407 RSA_free(rsa);
408 EVP_PKEY_free(ret);
409 return NULL((void *)0);
410}
411
412EVP_PKEY *
413b2i_PrivateKey(const unsigned char **in, long length)
414{
415 return do_b2i(in, length, 0);
416}
417LCRYPTO_ALIAS(b2i_PrivateKey)asm("");
418
419EVP_PKEY *
420b2i_PublicKey(const unsigned char **in, long length)
421{
422 return do_b2i(in, length, 1);
423}
424LCRYPTO_ALIAS(b2i_PublicKey)asm("");
425
426EVP_PKEY *
427b2i_PrivateKey_bio(BIO *in)
428{
429 return do_b2i_bio(in, 0);
430}
431LCRYPTO_ALIAS(b2i_PrivateKey_bio)asm("");
432
433EVP_PKEY *
434b2i_PublicKey_bio(BIO *in)
435{
436 return do_b2i_bio(in, 1);
437}
438LCRYPTO_ALIAS(b2i_PublicKey_bio)asm("");
439
440static void
441write_ledword(unsigned char **out, unsigned int dw)
442{
443 unsigned char *p = *out;
444
445 *p++ = dw & 0xff;
446 *p++ = (dw >> 8) & 0xff;
447 *p++ = (dw >> 16) & 0xff;
448 *p++ = (dw >> 24) & 0xff;
449 *out = p;
450}
451
452static void
453write_lebn(unsigned char **out, const BIGNUM *bn, int len)
454{
455 int nb, i;
456 unsigned char *p = *out, *q, c;
457
458 nb = BN_num_bytes(bn)((BN_num_bits(bn)+7)/8);
459 BN_bn2bin(bn, p);
460 q = p + nb - 1;
461 /* In place byte order reversal */
462 for (i = 0; i < nb / 2; i++) {
463 c = *p;
464 *p++ = *q;
465 *q-- = c;
466 }
467 *out += nb;
468 /* Pad with zeroes if we have to */
469 if (len > 0) {
470 len -= nb;
471 if (len > 0) {
472 memset(*out, 0, len);
473 *out += len;
474 }
475 }
476}
477
478
479static int check_bitlen_rsa(RSA *rsa, int ispub, unsigned int *magic);
480static int check_bitlen_dsa(DSA *dsa, int ispub, unsigned int *magic);
481
482static void write_rsa(unsigned char **out, RSA *rsa, int ispub);
483static void write_dsa(unsigned char **out, DSA *dsa, int ispub);
484
485static int
486do_i2b(unsigned char **out, EVP_PKEY *pk, int ispub)
487{
488 unsigned char *p;
489 unsigned int bitlen, magic = 0, keyalg;
490 int outlen, noinc = 0;
491
492 if (pk->type == EVP_PKEY_DSA116) {
493 bitlen = check_bitlen_dsa(pk->pkey.dsa, ispub, &magic);
494 keyalg = MS_KEYALG_DSS_SIGN0x2200;
495 } else if (pk->type == EVP_PKEY_RSA6) {
496 bitlen = check_bitlen_rsa(pk->pkey.rsa, ispub, &magic);
497 keyalg = MS_KEYALG_RSA_KEYX0xa400;
498 } else
499 return -1;
500 if (bitlen == 0)
501 return -1;
502 outlen = 16 + blob_length(bitlen,
503 keyalg == MS_KEYALG_DSS_SIGN0x2200 ? 1 : 0, ispub);
504 if (out == NULL((void *)0))
505 return outlen;
506 if (*out)
507 p = *out;
508 else {
509 p = malloc(outlen);
510 if (!p)
511 return -1;
512 *out = p;
513 noinc = 1;
514 }
515 if (ispub)
516 *p++ = MS_PUBLICKEYBLOB0x6;
517 else
518 *p++ = MS_PRIVATEKEYBLOB0x7;
519 *p++ = 0x2;
520 *p++ = 0;
521 *p++ = 0;
522 write_ledword(&p, keyalg);
523 write_ledword(&p, magic);
524 write_ledword(&p, bitlen);
525 if (keyalg == MS_KEYALG_DSS_SIGN0x2200)
526 write_dsa(&p, pk->pkey.dsa, ispub);
527 else
528 write_rsa(&p, pk->pkey.rsa, ispub);
529 if (!noinc)
530 *out += outlen;
531 return outlen;
532}
533
534static int
535do_i2b_bio(BIO *out, EVP_PKEY *pk, int ispub)
536{
537 unsigned char *tmp = NULL((void *)0);
538 int outlen, wrlen;
539
540 outlen = do_i2b(&tmp, pk, ispub);
541 if (outlen < 0)
542 return -1;
543 wrlen = BIO_write(out, tmp, outlen);
544 free(tmp);
545 if (wrlen == outlen)
546 return outlen;
547 return -1;
548}
549
550static int
551check_bitlen_dsa(DSA *dsa, int ispub, unsigned int *pmagic)
552{
553 int bitlen;
554
555 bitlen = BN_num_bits(dsa->p);
556 if ((bitlen & 7) || (BN_num_bits(dsa->q) != 160) ||
557 (BN_num_bits(dsa->g) > bitlen))
558 goto err;
559 if (ispub) {
560 if (BN_num_bits(dsa->pub_key) > bitlen)
561 goto err;
562 *pmagic = MS_DSS1MAGIC0x31535344L;
563 } else {
564 if (BN_num_bits(dsa->priv_key) > 160)
565 goto err;
566 *pmagic = MS_DSS2MAGIC0x32535344L;
567 }
568
569 return bitlen;
570
571 err:
572 PEMerror(PEM_R_UNSUPPORTED_KEY_COMPONENTS)ERR_put_error(9,(0xfff),(126),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,572);
573 return 0;
574}
575
576static int
577check_bitlen_rsa(RSA *rsa, int ispub, unsigned int *pmagic)
578{
579 int nbyte, hnbyte, bitlen;
580
581 if (BN_num_bits(rsa->e) > 32)
582 goto err;
583 bitlen = BN_num_bits(rsa->n);
584 nbyte = BN_num_bytes(rsa->n)((BN_num_bits(rsa->n)+7)/8);
585 hnbyte = (BN_num_bits(rsa->n) + 15) >> 4;
586 if (ispub) {
587 *pmagic = MS_RSA1MAGIC0x31415352L;
588 return bitlen;
589 } else {
590 *pmagic = MS_RSA2MAGIC0x32415352L;
591 /* For private key each component must fit within nbyte or
592 * hnbyte.
593 */
594 if (BN_num_bytes(rsa->d)((BN_num_bits(rsa->d)+7)/8) > nbyte)
595 goto err;
596 if ((BN_num_bytes(rsa->iqmp)((BN_num_bits(rsa->iqmp)+7)/8) > hnbyte) ||
597 (BN_num_bytes(rsa->p)((BN_num_bits(rsa->p)+7)/8) > hnbyte) ||
598 (BN_num_bytes(rsa->q)((BN_num_bits(rsa->q)+7)/8) > hnbyte) ||
599 (BN_num_bytes(rsa->dmp1)((BN_num_bits(rsa->dmp1)+7)/8) > hnbyte) ||
600 (BN_num_bytes(rsa->dmq1)((BN_num_bits(rsa->dmq1)+7)/8) > hnbyte))
601 goto err;
602 }
603 return bitlen;
604
605 err:
606 PEMerror(PEM_R_UNSUPPORTED_KEY_COMPONENTS)ERR_put_error(9,(0xfff),(126),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,606);
607 return 0;
608}
609
610static void
611write_rsa(unsigned char **out, RSA *rsa, int ispub)
612{
613 int nbyte, hnbyte;
614
615 nbyte = BN_num_bytes(rsa->n)((BN_num_bits(rsa->n)+7)/8);
616 hnbyte = (BN_num_bits(rsa->n) + 15) >> 4;
617 write_lebn(out, rsa->e, 4);
618 write_lebn(out, rsa->n, -1);
619 if (ispub)
620 return;
621 write_lebn(out, rsa->p, hnbyte);
622 write_lebn(out, rsa->q, hnbyte);
623 write_lebn(out, rsa->dmp1, hnbyte);
624 write_lebn(out, rsa->dmq1, hnbyte);
625 write_lebn(out, rsa->iqmp, hnbyte);
626 write_lebn(out, rsa->d, nbyte);
627}
628
629static void
630write_dsa(unsigned char **out, DSA *dsa, int ispub)
631{
632 int nbyte;
633
634 nbyte = BN_num_bytes(dsa->p)((BN_num_bits(dsa->p)+7)/8);
635 write_lebn(out, dsa->p, nbyte);
636 write_lebn(out, dsa->q, 20);
637 write_lebn(out, dsa->g, nbyte);
638 if (ispub)
639 write_lebn(out, dsa->pub_key, nbyte);
640 else
641 write_lebn(out, dsa->priv_key, 20);
642 /* Set "invalid" for seed structure values */
643 memset(*out, 0xff, 24);
644 *out += 24;
645 return;
646}
647
648int
649i2b_PrivateKey_bio(BIO *out, EVP_PKEY *pk)
650{
651 return do_i2b_bio(out, pk, 0);
652}
653LCRYPTO_ALIAS(i2b_PrivateKey_bio)asm("");
654
655int
656i2b_PublicKey_bio(BIO *out, EVP_PKEY *pk)
657{
658 return do_i2b_bio(out, pk, 1);
659}
660LCRYPTO_ALIAS(i2b_PublicKey_bio)asm("");
661
662#ifndef OPENSSL_NO_RC4
663
664static int
665do_PVK_header(const unsigned char **in, unsigned int length, int skip_magic,
666 unsigned int *psaltlen, unsigned int *pkeylen)
667{
668 const unsigned char *p = *in;
669 unsigned int pvk_magic, is_encrypted;
670
671 if (skip_magic) {
672 if (length < 20) {
673 PEMerror(PEM_R_PVK_TOO_SHORT)ERR_put_error(9,(0xfff),(125),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,673);
674 return 0;
675 }
676 length -= 20;
677 } else {
678 if (length < 24) {
679 PEMerror(PEM_R_PVK_TOO_SHORT)ERR_put_error(9,(0xfff),(125),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,679);
680 return 0;
681 }
682 length -= 24;
Value stored to 'length' is never read
683 pvk_magic = read_ledword(&p);
684 if (pvk_magic != MS_PVKMAGIC0xb0b5f11eL) {
685 PEMerror(PEM_R_BAD_MAGIC_NUMBER)ERR_put_error(9,(0xfff),(116),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,685);
686 return 0;
687 }
688 }
689 /* Skip reserved */
690 p += 4;
691 /*keytype = */read_ledword(&p);
692 is_encrypted = read_ledword(&p);
693 *psaltlen = read_ledword(&p);
694 *pkeylen = read_ledword(&p);
695 if (*psaltlen > 65536 || *pkeylen > 65536) {
696 PEMerror(PEM_R_ERROR_CONVERTING_PRIVATE_KEY)ERR_put_error(9,(0xfff),(115),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,696);
697 return 0;
698 }
699
700 if (is_encrypted && !*psaltlen) {
701 PEMerror(PEM_R_INCONSISTENT_HEADER)ERR_put_error(9,(0xfff),(121),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,701);
702 return 0;
703 }
704
705 *in = p;
706 return 1;
707}
708
709static int
710derive_pvk_key(unsigned char *key, const unsigned char *salt,
711 unsigned int saltlen, const unsigned char *pass, int passlen)
712{
713 EVP_MD_CTX mctx;
714 int rv = 1;
715
716 EVP_MD_CTX_init(&mctx);
717 if (!EVP_DigestInit_ex(&mctx, EVP_sha1(), NULL((void *)0)) ||
718 !EVP_DigestUpdate(&mctx, salt, saltlen) ||
719 !EVP_DigestUpdate(&mctx, pass, passlen) ||
720 !EVP_DigestFinal_ex(&mctx, key, NULL((void *)0)))
721 rv = 0;
722
723 EVP_MD_CTX_cleanup(&mctx);
724 return rv;
725}
726
727static EVP_PKEY *
728do_PVK_body(const unsigned char **in, unsigned int saltlen,
729 unsigned int keylen, pem_password_cb *cb, void *u)
730{
731 EVP_PKEY *ret = NULL((void *)0);
732 const unsigned char *p = *in;
733 unsigned int magic;
734 unsigned char *enctmp = NULL((void *)0), *q;
735 EVP_CIPHER_CTX *cctx = NULL((void *)0);
736
737 if ((cctx = EVP_CIPHER_CTX_new()) == NULL((void *)0)) {
738 PEMerror(ERR_R_MALLOC_FAILURE)ERR_put_error(9,(0xfff),((1|64)),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,738);
739 goto err;
740 }
741 if (saltlen) {
742 char psbuf[PEM_BUFSIZE1024];
743 unsigned char keybuf[20];
744 int enctmplen, inlen;
745
746 if (cb)
747 inlen = cb(psbuf, PEM_BUFSIZE1024, 0, u);
748 else
749 inlen = PEM_def_callback(psbuf, PEM_BUFSIZE1024, 0, u);
750 if (inlen <= 0) {
751 PEMerror(PEM_R_BAD_PASSWORD_READ)ERR_put_error(9,(0xfff),(104),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,751);
752 goto err;
753 }
754 enctmp = malloc(keylen + 8);
755 if (!enctmp) {
756 PEMerror(ERR_R_MALLOC_FAILURE)ERR_put_error(9,(0xfff),((1|64)),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,756);
757 goto err;
758 }
759 if (!derive_pvk_key(keybuf, p, saltlen, (unsigned char *)psbuf,
760 inlen)) {
761 goto err;
762 }
763 p += saltlen;
764 /* Copy BLOBHEADER across, decrypt rest */
765 memcpy(enctmp, p, 8);
766 p += 8;
767 if (keylen < 8) {
768 PEMerror(PEM_R_PVK_TOO_SHORT)ERR_put_error(9,(0xfff),(125),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,768);
769 goto err;
770 }
771 inlen = keylen - 8;
772 q = enctmp + 8;
773 if (!EVP_DecryptInit_ex(cctx, EVP_rc4(), NULL((void *)0), keybuf, NULL((void *)0)))
774 goto err;
775 if (!EVP_DecryptUpdate(cctx, q, &enctmplen, p, inlen))
776 goto err;
777 if (!EVP_DecryptFinal_ex(cctx, q + enctmplen, &enctmplen))
778 goto err;
779 magic = read_ledword((const unsigned char **)&q);
780 if (magic != MS_RSA2MAGIC0x32415352L && magic != MS_DSS2MAGIC0x32535344L) {
781 q = enctmp + 8;
782 memset(keybuf + 5, 0, 11);
783 if (!EVP_DecryptInit_ex(cctx, EVP_rc4(), NULL((void *)0), keybuf,
784 NULL((void *)0)))
785 goto err;
786 explicit_bzero(keybuf, 20);
787 if (!EVP_DecryptUpdate(cctx, q, &enctmplen, p, inlen))
788 goto err;
789 if (!EVP_DecryptFinal_ex(cctx, q + enctmplen,
790 &enctmplen))
791 goto err;
792 magic = read_ledword((const unsigned char **)&q);
793 if (magic != MS_RSA2MAGIC0x32415352L && magic != MS_DSS2MAGIC0x32535344L) {
794 PEMerror(PEM_R_BAD_DECRYPT)ERR_put_error(9,(0xfff),(101),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,794);
795 goto err;
796 }
797 } else
798 explicit_bzero(keybuf, 20);
799 p = enctmp;
800 }
801
802 ret = b2i_PrivateKey(&p, keylen);
803
804 err:
805 EVP_CIPHER_CTX_free(cctx);
806 if (enctmp && saltlen)
807 free(enctmp);
808 return ret;
809}
810
811
812EVP_PKEY *
813b2i_PVK_bio(BIO *in, pem_password_cb *cb, void *u)
814{
815 unsigned char pvk_hdr[24], *buf = NULL((void *)0);
816 const unsigned char *p;
817 size_t buflen;
818 EVP_PKEY *ret = NULL((void *)0);
819 unsigned int saltlen, keylen;
820
821 if (BIO_read(in, pvk_hdr, 24) != 24) {
822 PEMerror(PEM_R_PVK_DATA_TOO_SHORT)ERR_put_error(9,(0xfff),(124),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,822);
823 return NULL((void *)0);
824 }
825 p = pvk_hdr;
826
827 if (!do_PVK_header(&p, 24, 0, &saltlen, &keylen))
828 return 0;
829 buflen = keylen + saltlen;
830 buf = malloc(buflen);
831 if (!buf) {
832 PEMerror(ERR_R_MALLOC_FAILURE)ERR_put_error(9,(0xfff),((1|64)),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,832);
833 return 0;
834 }
835 p = buf;
836 if (BIO_read(in, buf, buflen) != buflen) {
837 PEMerror(PEM_R_PVK_DATA_TOO_SHORT)ERR_put_error(9,(0xfff),(124),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,837);
838 goto err;
839 }
840 ret = do_PVK_body(&p, saltlen, keylen, cb, u);
841
842 err:
843 freezero(buf, buflen);
844 return ret;
845}
846LCRYPTO_ALIAS(b2i_PVK_bio)asm("");
847
848static int
849i2b_PVK(unsigned char **out, EVP_PKEY*pk, int enclevel, pem_password_cb *cb,
850 void *u)
851{
852 int outlen = 24, pklen;
853 unsigned char *p = NULL((void *)0), *start = NULL((void *)0), *salt = NULL((void *)0);
854 EVP_CIPHER_CTX *cctx = NULL((void *)0);
855
856 if ((cctx = EVP_CIPHER_CTX_new()) == NULL((void *)0)) {
857 PEMerror(ERR_R_MALLOC_FAILURE)ERR_put_error(9,(0xfff),((1|64)),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,857);
858 goto err;
859 }
860 if (enclevel != 0)
861 outlen += PVK_SALTLEN0x10;
862 pklen = do_i2b(NULL((void *)0), pk, 0);
863 if (pklen < 0)
864 goto err;
865 outlen += pklen;
866 start = p = malloc(outlen);
867 if (!p) {
868 PEMerror(ERR_R_MALLOC_FAILURE)ERR_put_error(9,(0xfff),((1|64)),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,868);
869 goto err;
870 }
871
872 write_ledword(&p, MS_PVKMAGIC0xb0b5f11eL);
873 write_ledword(&p, 0);
874 if (pk->type == EVP_PKEY_DSA116)
875 write_ledword(&p, MS_KEYTYPE_SIGN0x2);
876 else
877 write_ledword(&p, MS_KEYTYPE_KEYX0x1);
878 write_ledword(&p, enclevel ? 1 : 0);
879 write_ledword(&p, enclevel ? PVK_SALTLEN0x10 : 0);
880 write_ledword(&p, pklen);
881 if (enclevel != 0) {
882 arc4random_buf(p, PVK_SALTLEN0x10);
883 salt = p;
884 p += PVK_SALTLEN0x10;
885 }
886 do_i2b(&p, pk, 0);
887 if (enclevel != 0) {
888 char psbuf[PEM_BUFSIZE1024];
889 unsigned char keybuf[20];
890 int enctmplen, inlen;
891 if (cb)
892 inlen = cb(psbuf, PEM_BUFSIZE1024, 1, u);
893 else
894 inlen = PEM_def_callback(psbuf, PEM_BUFSIZE1024, 1, u);
895 if (inlen <= 0) {
896 PEMerror(PEM_R_BAD_PASSWORD_READ)ERR_put_error(9,(0xfff),(104),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,896);
897 goto err;
898 }
899 if (!derive_pvk_key(keybuf, salt, PVK_SALTLEN0x10,
900 (unsigned char *)psbuf, inlen))
901 goto err;
902 if (enclevel == 1)
903 memset(keybuf + 5, 0, 11);
904 p = salt + PVK_SALTLEN0x10 + 8;
905 if (!EVP_EncryptInit_ex(cctx, EVP_rc4(), NULL((void *)0), keybuf, NULL((void *)0)))
906 goto err;
907 explicit_bzero(keybuf, 20);
908 if (!EVP_EncryptUpdate(cctx, p, &enctmplen, p, pklen - 8))
909 goto err;
910 if (!EVP_EncryptFinal_ex(cctx, p + enctmplen, &enctmplen))
911 goto err;
912 }
913 EVP_CIPHER_CTX_free(cctx);
914 *out = start;
915 return outlen;
916
917 err:
918 EVP_CIPHER_CTX_free(cctx);
919 free(start);
920 return -1;
921}
922
923int
924i2b_PVK_bio(BIO *out, EVP_PKEY *pk, int enclevel, pem_password_cb *cb, void *u)
925{
926 unsigned char *tmp = NULL((void *)0);
927 int outlen, wrlen;
928
929 outlen = i2b_PVK(&tmp, pk, enclevel, cb, u);
930 if (outlen < 0)
931 return -1;
932 wrlen = BIO_write(out, tmp, outlen);
933 free(tmp);
934 if (wrlen != outlen) {
935 PEMerror(PEM_R_BIO_WRITE_FAILURE)ERR_put_error(9,(0xfff),(118),"/usr/src/lib/libcrypto/pem/pvkfmt.c"
,935);
936 return -1;
937 }
938 return outlen;
939}
940LCRYPTO_ALIAS(i2b_PVK_bio)asm("");
941
942#endif
943
944#endif