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      1 /* Written by Dr Stephen N Henson (steve (at) openssl.org) for the OpenSSL
      2  * project 2005.
      3  */
      4 /* ====================================================================
      5  * Copyright (c) 2005 The OpenSSL Project.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  *
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  *
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in
     16  *    the documentation and/or other materials provided with the
     17  *    distribution.
     18  *
     19  * 3. All advertising materials mentioning features or use of this
     20  *    software must display the following acknowledgment:
     21  *    "This product includes software developed by the OpenSSL Project
     22  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
     23  *
     24  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
     25  *    endorse or promote products derived from this software without
     26  *    prior written permission. For written permission, please contact
     27  *    licensing (at) OpenSSL.org.
     28  *
     29  * 5. Products derived from this software may not be called "OpenSSL"
     30  *    nor may "OpenSSL" appear in their names without prior written
     31  *    permission of the OpenSSL Project.
     32  *
     33  * 6. Redistributions of any form whatsoever must retain the following
     34  *    acknowledgment:
     35  *    "This product includes software developed by the OpenSSL Project
     36  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
     37  *
     38  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
     39  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     40  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     41  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
     42  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     43  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     44  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     45  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     46  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     47  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     48  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
     49  * OF THE POSSIBILITY OF SUCH DAMAGE.
     50  * ====================================================================
     51  *
     52  * This product includes cryptographic software written by Eric Young
     53  * (eay (at) cryptsoft.com).  This product includes software written by Tim
     54  * Hudson (tjh (at) cryptsoft.com).
     55  *
     56  */
     57 
     58 /* Support for PVK format keys and related structures (such a PUBLICKEYBLOB
     59  * and PRIVATEKEYBLOB).
     60  */
     61 
     62 #include "cryptlib.h"
     63 #include <openssl/pem.h>
     64 #include <openssl/rand.h>
     65 #include <openssl/bn.h>
     66 #if !defined(OPENSSL_NO_RSA) && !defined(OPENSSL_NO_DSA)
     67 #include <openssl/dsa.h>
     68 #include <openssl/rsa.h>
     69 
     70 /* Utility function: read a DWORD (4 byte unsigned integer) in little endian
     71  * format
     72  */
     73 
     74 static unsigned int read_ledword(const unsigned char **in)
     75 	{
     76 	const unsigned char *p = *in;
     77 	unsigned int ret;
     78 	ret = *p++;
     79 	ret |= (*p++ << 8);
     80 	ret |= (*p++ << 16);
     81 	ret |= (*p++ << 24);
     82 	*in = p;
     83 	return ret;
     84 	}
     85 
     86 /* Read a BIGNUM in little endian format. The docs say that this should take up
     87  * bitlen/8 bytes.
     88  */
     89 
     90 static int read_lebn(const unsigned char **in, unsigned int nbyte, BIGNUM **r)
     91 	{
     92 	const unsigned char *p;
     93 	unsigned char *tmpbuf, *q;
     94 	unsigned int i;
     95 	p = *in + nbyte - 1;
     96 	tmpbuf = OPENSSL_malloc(nbyte);
     97 	if (!tmpbuf)
     98 		return 0;
     99 	q = tmpbuf;
    100 	for (i = 0; i < nbyte; i++)
    101 		*q++ = *p--;
    102 	*r = BN_bin2bn(tmpbuf, nbyte, NULL);
    103 	OPENSSL_free(tmpbuf);
    104 	if (*r)
    105 		{
    106 		*in += nbyte;
    107 		return 1;
    108 		}
    109 	else
    110 		return 0;
    111 	}
    112 
    113 
    114 /* Convert private key blob to EVP_PKEY: RSA and DSA keys supported */
    115 
    116 #define MS_PUBLICKEYBLOB	0x6
    117 #define MS_PRIVATEKEYBLOB	0x7
    118 #define MS_RSA1MAGIC		0x31415352L
    119 #define MS_RSA2MAGIC		0x32415352L
    120 #define MS_DSS1MAGIC		0x31535344L
    121 #define MS_DSS2MAGIC		0x32535344L
    122 
    123 #define MS_KEYALG_RSA_KEYX	0xa400
    124 #define MS_KEYALG_DSS_SIGN	0x2200
    125 
    126 #define MS_KEYTYPE_KEYX		0x1
    127 #define MS_KEYTYPE_SIGN		0x2
    128 
    129 /* The PVK file magic number: seems to spell out "bobsfile", who is Bob? */
    130 #define MS_PVKMAGIC		0xb0b5f11eL
    131 /* Salt length for PVK files */
    132 #define PVK_SALTLEN		0x10
    133 
    134 static EVP_PKEY *b2i_rsa(const unsigned char **in, unsigned int length,
    135 						unsigned int bitlen, int ispub);
    136 static EVP_PKEY *b2i_dss(const unsigned char **in, unsigned int length,
    137 						unsigned int bitlen, int ispub);
    138 
    139 static int do_blob_header(const unsigned char **in, unsigned int length,
    140 				unsigned int *pmagic, unsigned int *pbitlen,
    141 				int *pisdss, int *pispub)
    142 	{
    143 	const unsigned char *p = *in;
    144 	if (length < 16)
    145 		return 0;
    146 	/* bType */
    147 	if (*p == MS_PUBLICKEYBLOB)
    148 		{
    149 		if (*pispub == 0)
    150 			{
    151 			PEMerr(PEM_F_DO_BLOB_HEADER,
    152 					PEM_R_EXPECTING_PRIVATE_KEY_BLOB);
    153 			return 0;
    154 			}
    155 		*pispub = 1;
    156 		}
    157 	else if (*p == MS_PRIVATEKEYBLOB)
    158 		{
    159 		if (*pispub == 1)
    160 			{
    161 			PEMerr(PEM_F_DO_BLOB_HEADER,
    162 					PEM_R_EXPECTING_PUBLIC_KEY_BLOB);
    163 			return 0;
    164 			}
    165 		*pispub = 0;
    166 		}
    167 	else
    168 		return 0;
    169 	p++;
    170 	/* Version */
    171 	if (*p++ != 0x2)
    172 		{
    173 		PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_BAD_VERSION_NUMBER);
    174 		return 0;
    175 		}
    176 	/* Ignore reserved, aiKeyAlg */
    177 	p+= 6;
    178 	*pmagic = read_ledword(&p);
    179 	*pbitlen = read_ledword(&p);
    180 	*pisdss = 0;
    181 	switch (*pmagic)
    182 		{
    183 
    184 		case MS_DSS1MAGIC:
    185 		*pisdss = 1;
    186 		case MS_RSA1MAGIC:
    187 		if (*pispub == 0)
    188 			{
    189 			PEMerr(PEM_F_DO_BLOB_HEADER,
    190 					PEM_R_EXPECTING_PRIVATE_KEY_BLOB);
    191 			return 0;
    192 			}
    193 		break;
    194 
    195 		case MS_DSS2MAGIC:
    196 		*pisdss = 1;
    197 		case MS_RSA2MAGIC:
    198 		if (*pispub == 1)
    199 			{
    200 			PEMerr(PEM_F_DO_BLOB_HEADER,
    201 					PEM_R_EXPECTING_PUBLIC_KEY_BLOB);
    202 			return 0;
    203 			}
    204 		break;
    205 
    206 		default:
    207 		PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_BAD_MAGIC_NUMBER);
    208 		return -1;
    209 		}
    210 	*in = p;
    211 	return 1;
    212 	}
    213 
    214 static unsigned int blob_length(unsigned bitlen, int isdss, int ispub)
    215 	{
    216 	unsigned int nbyte, hnbyte;
    217 	nbyte = (bitlen + 7) >> 3;
    218 	hnbyte = (bitlen + 15) >> 4;
    219 	if (isdss)
    220 		{
    221 
    222 		/* Expected length: 20 for q + 3 components bitlen each + 24
    223 		 * for seed structure.
    224 		 */
    225 		if (ispub)
    226 			return  44 + 3 * nbyte;
    227 		/* Expected length: 20 for q, priv, 2 bitlen components + 24
    228 		 * for seed structure.
    229 		 */
    230 		else
    231 			return 64 + 2 * nbyte;
    232 		}
    233 	else
    234 		{
    235 		/* Expected length: 4 for 'e' + 'n' */
    236 		if (ispub)
    237 			return 4 + nbyte;
    238 		else
    239 		/* Expected length: 4 for 'e' and 7 other components.
    240 		 * 2 components are bitlen size, 5 are bitlen/2
    241 		 */
    242 			return 4 + 2*nbyte + 5*hnbyte;
    243 		}
    244 
    245 	}
    246 
    247 static EVP_PKEY *do_b2i(const unsigned char **in, unsigned int length,
    248 								int ispub)
    249 	{
    250 	const unsigned char *p = *in;
    251 	unsigned int bitlen, magic;
    252 	int isdss;
    253 	if (do_blob_header(&p, length, &magic, &bitlen, &isdss, &ispub) <= 0)
    254 		{
    255 		PEMerr(PEM_F_DO_B2I, PEM_R_KEYBLOB_HEADER_PARSE_ERROR);
    256 		return NULL;
    257 		}
    258 	length -= 16;
    259 	if (length < blob_length(bitlen, isdss, ispub))
    260 		{
    261 		PEMerr(PEM_F_DO_B2I, PEM_R_KEYBLOB_TOO_SHORT);
    262 		return NULL;
    263 		}
    264 	if (isdss)
    265 		return b2i_dss(&p, length, bitlen, ispub);
    266 	else
    267 		return b2i_rsa(&p, length, bitlen, ispub);
    268 	}
    269 
    270 static EVP_PKEY *do_b2i_bio(BIO *in, int ispub)
    271 	{
    272 	const unsigned char *p;
    273 	unsigned char hdr_buf[16], *buf = NULL;
    274 	unsigned int bitlen, magic, length;
    275 	int isdss;
    276 	EVP_PKEY *ret = NULL;
    277 	if (BIO_read(in, hdr_buf, 16) != 16)
    278 		{
    279 		PEMerr(PEM_F_DO_B2I_BIO, PEM_R_KEYBLOB_TOO_SHORT);
    280 		return NULL;
    281 		}
    282 	p = hdr_buf;
    283 	if (do_blob_header(&p, 16, &magic, &bitlen, &isdss, &ispub) <= 0)
    284 		return NULL;
    285 
    286 	length = blob_length(bitlen, isdss, ispub);
    287 	buf = OPENSSL_malloc(length);
    288 	if (!buf)
    289 		{
    290 		PEMerr(PEM_F_DO_B2I_BIO, ERR_R_MALLOC_FAILURE);
    291 		goto err;
    292 		}
    293 	p = buf;
    294 	if (BIO_read(in, buf, length) != (int)length)
    295 		{
    296 		PEMerr(PEM_F_DO_B2I_BIO, PEM_R_KEYBLOB_TOO_SHORT);
    297 		goto err;
    298 		}
    299 
    300 	if (isdss)
    301 		ret = b2i_dss(&p, length, bitlen, ispub);
    302 	else
    303 		ret = b2i_rsa(&p, length, bitlen, ispub);
    304 
    305 	err:
    306 	if (buf)
    307 		OPENSSL_free(buf);
    308 	return ret;
    309 	}
    310 
    311 static EVP_PKEY *b2i_dss(const unsigned char **in, unsigned int length,
    312 						unsigned int bitlen, int ispub)
    313 	{
    314 	const unsigned char *p = *in;
    315 	EVP_PKEY *ret = NULL;
    316 	DSA *dsa = NULL;
    317 	BN_CTX *ctx = NULL;
    318 	unsigned int nbyte;
    319 	nbyte = (bitlen + 7) >> 3;
    320 
    321 	dsa = DSA_new();
    322 	ret = EVP_PKEY_new();
    323 	if (!dsa || !ret)
    324 		goto memerr;
    325 	if (!read_lebn(&p, nbyte, &dsa->p))
    326 		goto memerr;
    327 	if (!read_lebn(&p, 20, &dsa->q))
    328 		goto memerr;
    329 	if (!read_lebn(&p, nbyte, &dsa->g))
    330 		goto memerr;
    331 	if (ispub)
    332 		{
    333 		if (!read_lebn(&p, nbyte, &dsa->pub_key))
    334 			goto memerr;
    335 		}
    336 	else
    337 		{
    338 		if (!read_lebn(&p, 20, &dsa->priv_key))
    339 			goto memerr;
    340 		/* Calculate public key */
    341 		if (!(dsa->pub_key = BN_new()))
    342 			goto memerr;
    343 		if (!(ctx = BN_CTX_new()))
    344 			goto memerr;
    345 
    346 		if (!BN_mod_exp(dsa->pub_key, dsa->g,
    347 						 dsa->priv_key, dsa->p, ctx))
    348 
    349 			goto memerr;
    350 		BN_CTX_free(ctx);
    351 		}
    352 
    353 	EVP_PKEY_set1_DSA(ret, dsa);
    354 	DSA_free(dsa);
    355 	*in = p;
    356 	return ret;
    357 
    358 	memerr:
    359 	PEMerr(PEM_F_B2I_DSS, ERR_R_MALLOC_FAILURE);
    360 	if (dsa)
    361 		DSA_free(dsa);
    362 	if (ret)
    363 		EVP_PKEY_free(ret);
    364 	if (ctx)
    365 		BN_CTX_free(ctx);
    366 	return NULL;
    367 	}
    368 
    369 static EVP_PKEY *b2i_rsa(const unsigned char **in, unsigned int length,
    370 						unsigned int bitlen, int ispub)
    371 
    372 	{
    373 	const unsigned char *p = *in;
    374 	EVP_PKEY *ret = NULL;
    375 	RSA *rsa = NULL;
    376 	unsigned int nbyte, hnbyte;
    377 	nbyte = (bitlen + 7) >> 3;
    378 	hnbyte = (bitlen + 15) >> 4;
    379 	rsa = RSA_new();
    380 	ret = EVP_PKEY_new();
    381 	if (!rsa || !ret)
    382 		goto memerr;
    383 	rsa->e = BN_new();
    384 	if (!rsa->e)
    385 		goto memerr;
    386 	if (!BN_set_word(rsa->e, read_ledword(&p)))
    387 		goto memerr;
    388 	if (!read_lebn(&p, nbyte, &rsa->n))
    389 		goto memerr;
    390 	if (!ispub)
    391 		{
    392 		if (!read_lebn(&p, hnbyte, &rsa->p))
    393 			goto memerr;
    394 		if (!read_lebn(&p, hnbyte, &rsa->q))
    395 			goto memerr;
    396 		if (!read_lebn(&p, hnbyte, &rsa->dmp1))
    397 			goto memerr;
    398 		if (!read_lebn(&p, hnbyte, &rsa->dmq1))
    399 			goto memerr;
    400 		if (!read_lebn(&p, hnbyte, &rsa->iqmp))
    401 			goto memerr;
    402 		if (!read_lebn(&p, nbyte, &rsa->d))
    403 			goto memerr;
    404 		}
    405 
    406 	EVP_PKEY_set1_RSA(ret, rsa);
    407 	RSA_free(rsa);
    408 	*in = p;
    409 	return ret;
    410 	memerr:
    411 	PEMerr(PEM_F_B2I_RSA, ERR_R_MALLOC_FAILURE);
    412 	if (rsa)
    413 		RSA_free(rsa);
    414 	if (ret)
    415 		EVP_PKEY_free(ret);
    416 	return NULL;
    417 	}
    418 
    419 EVP_PKEY *b2i_PrivateKey(const unsigned char **in, long length)
    420 	{
    421 	return do_b2i(in, length, 0);
    422 	}
    423 
    424 EVP_PKEY *b2i_PublicKey(const unsigned char **in, long length)
    425 	{
    426 	return do_b2i(in, length, 1);
    427 	}
    428 
    429 
    430 EVP_PKEY *b2i_PrivateKey_bio(BIO *in)
    431 	{
    432 	return do_b2i_bio(in, 0);
    433 	}
    434 
    435 EVP_PKEY *b2i_PublicKey_bio(BIO *in)
    436 	{
    437 	return do_b2i_bio(in, 1);
    438 	}
    439 
    440 static void write_ledword(unsigned char **out, unsigned int dw)
    441 	{
    442 	unsigned char *p = *out;
    443 	*p++ = dw & 0xff;
    444 	*p++ = (dw>>8) & 0xff;
    445 	*p++ = (dw>>16) & 0xff;
    446 	*p++ = (dw>>24) & 0xff;
    447 	*out = p;
    448 	}
    449 
    450 static void write_lebn(unsigned char **out, const BIGNUM *bn, int len)
    451 	{
    452 	int nb, i;
    453 	unsigned char *p = *out, *q, c;
    454 	nb = BN_num_bytes(bn);
    455 	BN_bn2bin(bn, p);
    456 	q = p + nb - 1;
    457 	/* In place byte order reversal */
    458 	for (i = 0; i < nb/2; i++)
    459 		{
    460 		c = *p;
    461 		*p++ = *q;
    462 		*q-- = c;
    463 		}
    464 	*out += nb;
    465 	/* Pad with zeroes if we have to */
    466 	if (len > 0)
    467 		{
    468 		len -= nb;
    469 		if (len > 0)
    470 			{
    471 			memset(*out, 0, len);
    472 			*out += len;
    473 			}
    474 		}
    475 	}
    476 
    477 
    478 static int check_bitlen_rsa(RSA *rsa, int ispub, unsigned int *magic);
    479 static int check_bitlen_dsa(DSA *dsa, int ispub, unsigned int *magic);
    480 
    481 static void write_rsa(unsigned char **out, RSA *rsa, int ispub);
    482 static void write_dsa(unsigned char **out, DSA *dsa, int ispub);
    483 
    484 static int do_i2b(unsigned char **out, EVP_PKEY *pk, int ispub)
    485 	{
    486 	unsigned char *p;
    487 	unsigned int bitlen, magic = 0, keyalg;
    488 	int outlen, noinc = 0;
    489 	if (pk->type == EVP_PKEY_DSA)
    490 		{
    491 		bitlen = check_bitlen_dsa(pk->pkey.dsa, ispub, &magic);
    492 		keyalg = MS_KEYALG_DSS_SIGN;
    493 		}
    494 	else if (pk->type == EVP_PKEY_RSA)
    495 		{
    496 		bitlen = check_bitlen_rsa(pk->pkey.rsa, ispub, &magic);
    497 		keyalg = MS_KEYALG_RSA_KEYX;
    498 		}
    499 	else
    500 		return -1;
    501 	if (bitlen == 0)
    502 		return -1;
    503 	outlen = 16 + blob_length(bitlen,
    504 			keyalg == MS_KEYALG_DSS_SIGN ? 1 : 0, ispub);
    505 	if (out == NULL)
    506 		return outlen;
    507 	if (*out)
    508 		p = *out;
    509 	else
    510 		{
    511 		p = OPENSSL_malloc(outlen);
    512 		if (!p)
    513 			return -1;
    514 		*out = p;
    515 		noinc = 1;
    516 		}
    517 	if (ispub)
    518 		*p++ = MS_PUBLICKEYBLOB;
    519 	else
    520 		*p++ = MS_PRIVATEKEYBLOB;
    521 	*p++ = 0x2;
    522 	*p++ = 0;
    523 	*p++ = 0;
    524 	write_ledword(&p, keyalg);
    525 	write_ledword(&p, magic);
    526 	write_ledword(&p, bitlen);
    527 	if (keyalg == MS_KEYALG_DSS_SIGN)
    528 		write_dsa(&p, pk->pkey.dsa, ispub);
    529 	else
    530 		write_rsa(&p, pk->pkey.rsa, ispub);
    531 	if (!noinc)
    532 		*out += outlen;
    533 	return outlen;
    534 	}
    535 
    536 static int do_i2b_bio(BIO *out, EVP_PKEY *pk, int ispub)
    537 	{
    538 	unsigned char *tmp = NULL;
    539 	int outlen, wrlen;
    540 	outlen = do_i2b(&tmp, pk, ispub);
    541 	if (outlen < 0)
    542 		return -1;
    543 	wrlen = BIO_write(out, tmp, outlen);
    544 	OPENSSL_free(tmp);
    545 	if (wrlen == outlen)
    546 		return outlen;
    547 	return -1;
    548 	}
    549 
    550 static int check_bitlen_dsa(DSA *dsa, int ispub, unsigned int *pmagic)
    551 	{
    552 	int bitlen;
    553 	bitlen = BN_num_bits(dsa->p);
    554 	if ((bitlen & 7) || (BN_num_bits(dsa->q) != 160)
    555 		|| (BN_num_bits(dsa->g) > bitlen))
    556 		goto badkey;
    557 	if (ispub)
    558 		{
    559 		if (BN_num_bits(dsa->pub_key) > bitlen)
    560 			goto badkey;
    561 		*pmagic = MS_DSS1MAGIC;
    562 		}
    563 	else
    564 		{
    565 		if (BN_num_bits(dsa->priv_key) > 160)
    566 			goto badkey;
    567 		*pmagic = MS_DSS2MAGIC;
    568 		}
    569 
    570 	return bitlen;
    571 	badkey:
    572 	PEMerr(PEM_F_CHECK_BITLEN_DSA, PEM_R_UNSUPPORTED_KEY_COMPONENTS);
    573 	return 0;
    574 	}
    575 
    576 static int check_bitlen_rsa(RSA *rsa, int ispub, unsigned int *pmagic)
    577 	{
    578 	int nbyte, hnbyte, bitlen;
    579 	if (BN_num_bits(rsa->e) > 32)
    580 		goto badkey;
    581 	bitlen = BN_num_bits(rsa->n);
    582 	nbyte = BN_num_bytes(rsa->n);
    583 	hnbyte = (BN_num_bits(rsa->n) + 15) >> 4;
    584 	if (ispub)
    585 		{
    586 		*pmagic = MS_RSA1MAGIC;
    587 		return bitlen;
    588 		}
    589 	else
    590 	{
    591 		*pmagic = MS_RSA2MAGIC;
    592 		/* For private key each component must fit within nbyte or
    593 		 * hnbyte.
    594 		 */
    595 		if (BN_num_bytes(rsa->d) > nbyte)
    596 			goto badkey;
    597 		if ((BN_num_bytes(rsa->iqmp) > hnbyte)
    598 			|| (BN_num_bytes(rsa->p) > hnbyte)
    599 			|| (BN_num_bytes(rsa->q) > hnbyte)
    600 			|| (BN_num_bytes(rsa->dmp1) > hnbyte)
    601 			|| (BN_num_bytes(rsa->dmq1) > hnbyte))
    602 			goto badkey;
    603 	}
    604 	return bitlen;
    605 	badkey:
    606 	PEMerr(PEM_F_CHECK_BITLEN_RSA, PEM_R_UNSUPPORTED_KEY_COMPONENTS);
    607 	return 0;
    608 	}
    609 
    610 
    611 static void write_rsa(unsigned char **out, RSA *rsa, int ispub)
    612 	{
    613 	int nbyte, hnbyte;
    614 	nbyte = BN_num_bytes(rsa->n);
    615 	hnbyte = (BN_num_bits(rsa->n) + 15) >> 4;
    616 	write_lebn(out, rsa->e, 4);
    617 	write_lebn(out, rsa->n, -1);
    618 	if (ispub)
    619 		return;
    620 	write_lebn(out, rsa->p, hnbyte);
    621 	write_lebn(out, rsa->q, hnbyte);
    622 	write_lebn(out, rsa->dmp1, hnbyte);
    623 	write_lebn(out, rsa->dmq1, hnbyte);
    624 	write_lebn(out, rsa->iqmp, hnbyte);
    625 	write_lebn(out, rsa->d, nbyte);
    626 	}
    627 
    628 
    629 static void write_dsa(unsigned char **out, DSA *dsa, int ispub)
    630 	{
    631 	int nbyte;
    632 	nbyte = BN_num_bytes(dsa->p);
    633 	write_lebn(out, dsa->p, nbyte);
    634 	write_lebn(out, dsa->q, 20);
    635 	write_lebn(out, dsa->g, nbyte);
    636 	if (ispub)
    637 		write_lebn(out, dsa->pub_key, nbyte);
    638 	else
    639 		write_lebn(out, dsa->priv_key, 20);
    640 	/* Set "invalid" for seed structure values */
    641 	memset(*out, 0xff, 24);
    642 	*out += 24;
    643 	return;
    644 	}
    645 
    646 
    647 int i2b_PrivateKey_bio(BIO *out, EVP_PKEY *pk)
    648 	{
    649 	return do_i2b_bio(out, pk, 0);
    650 	}
    651 
    652 int i2b_PublicKey_bio(BIO *out, EVP_PKEY *pk)
    653 	{
    654 	return do_i2b_bio(out, pk, 1);
    655 	}
    656 
    657 #ifndef OPENSSL_NO_RC4
    658 
    659 static int do_PVK_header(const unsigned char **in, unsigned int length,
    660 		int skip_magic,
    661 	       	unsigned int *psaltlen, unsigned int *pkeylen)
    662 
    663 	{
    664 	const unsigned char *p = *in;
    665 	unsigned int pvk_magic, is_encrypted;
    666 	if (skip_magic)
    667 		{
    668 		if (length < 20)
    669 			{
    670 			PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_PVK_TOO_SHORT);
    671 			return 0;
    672 			}
    673 		length -= 20;
    674 		}
    675 	else
    676 		{
    677 		if (length < 24)
    678 			{
    679 			PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_PVK_TOO_SHORT);
    680 			return 0;
    681 			}
    682 		length -= 24;
    683 		pvk_magic = read_ledword(&p);
    684 		if (pvk_magic != MS_PVKMAGIC)
    685 			{
    686 			PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_BAD_MAGIC_NUMBER);
    687 			return 0;
    688 			}
    689 		}
    690 	/* Skip reserved */
    691 	p += 4;
    692 	/*keytype = */read_ledword(&p);
    693 	is_encrypted = read_ledword(&p);
    694 	*psaltlen = read_ledword(&p);
    695 	*pkeylen = read_ledword(&p);
    696 
    697 	if (is_encrypted && !*psaltlen)
    698 		{
    699 		PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_INCONSISTENT_HEADER);
    700 		return 0;
    701 		}
    702 
    703 	*in = p;
    704 	return 1;
    705 	}
    706 
    707 static int derive_pvk_key(unsigned char *key,
    708 			const unsigned char *salt, unsigned int saltlen,
    709 			const unsigned char *pass, int passlen)
    710 	{
    711 	EVP_MD_CTX mctx;
    712 	int rv = 1;
    713 	EVP_MD_CTX_init(&mctx);
    714 	if (!EVP_DigestInit_ex(&mctx, EVP_sha1(), NULL)
    715 		|| !EVP_DigestUpdate(&mctx, salt, saltlen)
    716 		|| !EVP_DigestUpdate(&mctx, pass, passlen)
    717 		|| !EVP_DigestFinal_ex(&mctx, key, NULL))
    718 			rv = 0;
    719 
    720 	EVP_MD_CTX_cleanup(&mctx);
    721 	return rv;
    722 	}
    723 
    724 
    725 static EVP_PKEY *do_PVK_body(const unsigned char **in,
    726 		unsigned int saltlen, unsigned int keylen,
    727 		pem_password_cb *cb, void *u)
    728 	{
    729 	EVP_PKEY *ret = NULL;
    730 	const unsigned char *p = *in;
    731 	unsigned int magic;
    732 	unsigned char *enctmp = NULL, *q;
    733 	EVP_CIPHER_CTX cctx;
    734 	EVP_CIPHER_CTX_init(&cctx);
    735 	if (saltlen)
    736 		{
    737 		char psbuf[PEM_BUFSIZE];
    738 		unsigned char keybuf[20];
    739 		int enctmplen, inlen;
    740 		if (cb)
    741 			inlen=cb(psbuf,PEM_BUFSIZE,0,u);
    742 		else
    743 			inlen=PEM_def_callback(psbuf,PEM_BUFSIZE,0,u);
    744 		if (inlen <= 0)
    745 			{
    746 			PEMerr(PEM_F_DO_PVK_BODY,PEM_R_BAD_PASSWORD_READ);
    747 			return NULL;
    748 			}
    749 		enctmp = OPENSSL_malloc(keylen + 8);
    750 		if (!enctmp)
    751 			{
    752 			PEMerr(PEM_F_DO_PVK_BODY, ERR_R_MALLOC_FAILURE);
    753 			return NULL;
    754 			}
    755 		if (!derive_pvk_key(keybuf, p, saltlen,
    756 			    (unsigned char *)psbuf, inlen))
    757 			return NULL;
    758 		p += saltlen;
    759 		/* Copy BLOBHEADER across, decrypt rest */
    760 		memcpy(enctmp, p, 8);
    761 		p += 8;
    762 		if (keylen < 8)
    763 			{
    764 			PEMerr(PEM_F_DO_PVK_BODY, PEM_R_PVK_TOO_SHORT);
    765 			return NULL;
    766 			}
    767 		inlen = keylen - 8;
    768 		q = enctmp + 8;
    769 		if (!EVP_DecryptInit_ex(&cctx, EVP_rc4(), NULL, keybuf, NULL))
    770 			goto err;
    771 		if (!EVP_DecryptUpdate(&cctx, q, &enctmplen, p, inlen))
    772 			goto err;
    773 		if (!EVP_DecryptFinal_ex(&cctx, q + enctmplen, &enctmplen))
    774 			goto err;
    775 		magic = read_ledword((const unsigned char **)&q);
    776 		if (magic != MS_RSA2MAGIC && magic != MS_DSS2MAGIC)
    777 			{
    778 			q = enctmp + 8;
    779 			memset(keybuf + 5, 0, 11);
    780 			if (!EVP_DecryptInit_ex(&cctx, EVP_rc4(), NULL, keybuf,
    781 								NULL))
    782 				goto err;
    783 			OPENSSL_cleanse(keybuf, 20);
    784 			if (!EVP_DecryptUpdate(&cctx, q, &enctmplen, p, inlen))
    785 				goto err;
    786 			if (!EVP_DecryptFinal_ex(&cctx, q + enctmplen,
    787 								&enctmplen))
    788 				goto err;
    789 			magic = read_ledword((const unsigned char **)&q);
    790 			if (magic != MS_RSA2MAGIC && magic != MS_DSS2MAGIC)
    791 				{
    792 				PEMerr(PEM_F_DO_PVK_BODY, PEM_R_BAD_DECRYPT);
    793 				goto err;
    794 				}
    795 			}
    796 		else
    797 			OPENSSL_cleanse(keybuf, 20);
    798 		p = enctmp;
    799 		}
    800 
    801 	ret = b2i_PrivateKey(&p, keylen);
    802 	err:
    803 	EVP_CIPHER_CTX_cleanup(&cctx);
    804 	if (enctmp && saltlen)
    805 		OPENSSL_free(enctmp);
    806 	return ret;
    807 	}
    808 
    809 
    810 EVP_PKEY *b2i_PVK_bio(BIO *in, pem_password_cb *cb, void *u)
    811 	{
    812 	unsigned char pvk_hdr[24], *buf = NULL;
    813 	const unsigned char *p;
    814 	int buflen;
    815 	EVP_PKEY *ret = NULL;
    816 	unsigned int saltlen, keylen;
    817 	if (BIO_read(in, pvk_hdr, 24) != 24)
    818 		{
    819 		PEMerr(PEM_F_B2I_PVK_BIO, PEM_R_PVK_DATA_TOO_SHORT);
    820 		return NULL;
    821 		}
    822 	p = pvk_hdr;
    823 
    824 	if (!do_PVK_header(&p, 24, 0, &saltlen, &keylen))
    825 		return 0;
    826 	buflen = (int) keylen + saltlen;
    827 	buf = OPENSSL_malloc(buflen);
    828 	if (!buf)
    829 		{
    830 		PEMerr(PEM_F_B2I_PVK_BIO, ERR_R_MALLOC_FAILURE);
    831 		return 0;
    832 		}
    833 	p = buf;
    834 	if (BIO_read(in, buf, buflen) != buflen)
    835 		{
    836 		PEMerr(PEM_F_B2I_PVK_BIO, PEM_R_PVK_DATA_TOO_SHORT);
    837 		goto err;
    838 		}
    839 	ret = do_PVK_body(&p, saltlen, keylen, cb, u);
    840 
    841 	err:
    842 	if (buf)
    843 		{
    844 		OPENSSL_cleanse(buf, buflen);
    845 		OPENSSL_free(buf);
    846 		}
    847 	return ret;
    848 	}
    849 
    850 
    851 
    852 static int i2b_PVK(unsigned char **out, EVP_PKEY*pk, int enclevel,
    853 		pem_password_cb *cb, void *u)
    854 	{
    855 	int outlen = 24, pklen;
    856 	unsigned char *p, *salt = NULL;
    857 	EVP_CIPHER_CTX cctx;
    858 	EVP_CIPHER_CTX_init(&cctx);
    859 	if (enclevel)
    860 		outlen += PVK_SALTLEN;
    861 	pklen = do_i2b(NULL, pk, 0);
    862 	if (pklen < 0)
    863 		return -1;
    864 	outlen += pklen;
    865 	if (!out)
    866 		return outlen;
    867 	if (*out)
    868 		p = *out;
    869 	else
    870 		{
    871 		p = OPENSSL_malloc(outlen);
    872 		if (!p)
    873 			{
    874 			PEMerr(PEM_F_I2B_PVK,ERR_R_MALLOC_FAILURE);
    875 			return -1;
    876 			}
    877 		*out = p;
    878 		}
    879 
    880 	write_ledword(&p, MS_PVKMAGIC);
    881 	write_ledword(&p, 0);
    882 	if (pk->type == EVP_PKEY_DSA)
    883 		write_ledword(&p, MS_KEYTYPE_SIGN);
    884 	else
    885 		write_ledword(&p, MS_KEYTYPE_KEYX);
    886 	write_ledword(&p, enclevel ? 1 : 0);
    887 	write_ledword(&p, enclevel ? PVK_SALTLEN: 0);
    888 	write_ledword(&p, pklen);
    889 	if (enclevel)
    890 		{
    891 		if (RAND_bytes(p, PVK_SALTLEN) <= 0)
    892 			goto error;
    893 		salt = p;
    894 		p += PVK_SALTLEN;
    895 		}
    896 	do_i2b(&p, pk, 0);
    897 	if (enclevel == 0)
    898 		return outlen;
    899 	else
    900 		{
    901 		char psbuf[PEM_BUFSIZE];
    902 		unsigned char keybuf[20];
    903 		int enctmplen, inlen;
    904 		if (cb)
    905 			inlen=cb(psbuf,PEM_BUFSIZE,1,u);
    906 		else
    907 			inlen=PEM_def_callback(psbuf,PEM_BUFSIZE,1,u);
    908 		if (inlen <= 0)
    909 			{
    910 			PEMerr(PEM_F_I2B_PVK,PEM_R_BAD_PASSWORD_READ);
    911 			goto error;
    912 			}
    913 		if (!derive_pvk_key(keybuf, salt, PVK_SALTLEN,
    914 			    (unsigned char *)psbuf, inlen))
    915 			goto error;
    916 		if (enclevel == 1)
    917 			memset(keybuf + 5, 0, 11);
    918 		p = salt + PVK_SALTLEN + 8;
    919 		if (!EVP_EncryptInit_ex(&cctx, EVP_rc4(), NULL, keybuf, NULL))
    920 			goto error;
    921 		OPENSSL_cleanse(keybuf, 20);
    922 		if (!EVP_DecryptUpdate(&cctx, p, &enctmplen, p, pklen - 8))
    923 			goto error;
    924 		if (!EVP_DecryptFinal_ex(&cctx, p + enctmplen, &enctmplen))
    925 			goto error;
    926 		}
    927 	EVP_CIPHER_CTX_cleanup(&cctx);
    928 	return outlen;
    929 
    930 	error:
    931 	EVP_CIPHER_CTX_cleanup(&cctx);
    932 	return -1;
    933 	}
    934 
    935 int i2b_PVK_bio(BIO *out, EVP_PKEY *pk, int enclevel,
    936 		pem_password_cb *cb, void *u)
    937 	{
    938 	unsigned char *tmp = NULL;
    939 	int outlen, wrlen;
    940 	outlen = i2b_PVK(&tmp, pk, enclevel, cb, u);
    941 	if (outlen < 0)
    942 		return -1;
    943 	wrlen = BIO_write(out, tmp, outlen);
    944 	OPENSSL_free(tmp);
    945 	if (wrlen == outlen)
    946 		{
    947 		PEMerr(PEM_F_I2B_PVK_BIO, PEM_R_BIO_WRITE_FAILURE);
    948 		return outlen;
    949 		}
    950 	return -1;
    951 	}
    952 
    953 #endif
    954 
    955 #endif
    956