2 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
5 /* ====================================================================
6 * Copyright (c) 2005 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 * ====================================================================
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).
60 * Support for PVK format keys and related structures (such a PUBLICKEYBLOB
61 * and PRIVATEKEYBLOB).
64 #include "internal/cryptlib.h"
65 #include <openssl/pem.h>
66 #include <openssl/rand.h>
67 #include <openssl/bn.h>
68 #if !defined(OPENSSL_NO_RSA) && !defined(OPENSSL_NO_DSA)
69 # include <openssl/dsa.h>
70 # include <openssl/rsa.h>
73 * Utility function: read a DWORD (4 byte unsigned integer) in little endian
77 static unsigned int read_ledword(const unsigned char **in)
79 const unsigned char *p = *in;
90 * Read a BIGNUM in little endian format. The docs say that this should take
94 static int read_lebn(const unsigned char **in, unsigned int nbyte, BIGNUM **r)
96 *r = BN_lebin2bn(*in, nbyte, NULL);
103 /* Convert private key blob to EVP_PKEY: RSA and DSA keys supported */
105 # define MS_PUBLICKEYBLOB 0x6
106 # define MS_PRIVATEKEYBLOB 0x7
107 # define MS_RSA1MAGIC 0x31415352L
108 # define MS_RSA2MAGIC 0x32415352L
109 # define MS_DSS1MAGIC 0x31535344L
110 # define MS_DSS2MAGIC 0x32535344L
112 # define MS_KEYALG_RSA_KEYX 0xa400
113 # define MS_KEYALG_DSS_SIGN 0x2200
115 # define MS_KEYTYPE_KEYX 0x1
116 # define MS_KEYTYPE_SIGN 0x2
118 /* The PVK file magic number: seems to spell out "bobsfile", who is Bob? */
119 # define MS_PVKMAGIC 0xb0b5f11eL
120 /* Salt length for PVK files */
121 # define PVK_SALTLEN 0x10
122 /* Maximum length in PVK header */
123 # define PVK_MAX_KEYLEN 102400
124 /* Maximum salt length */
125 # define PVK_MAX_SALTLEN 10240
127 static EVP_PKEY *b2i_rsa(const unsigned char **in,
128 unsigned int bitlen, int ispub);
129 static EVP_PKEY *b2i_dss(const unsigned char **in,
130 unsigned int bitlen, int ispub);
132 static int do_blob_header(const unsigned char **in, unsigned int length,
133 unsigned int *pmagic, unsigned int *pbitlen,
134 int *pisdss, int *pispub)
136 const unsigned char *p = *in;
140 if (*p == MS_PUBLICKEYBLOB) {
142 PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_EXPECTING_PRIVATE_KEY_BLOB);
146 } else if (*p == MS_PRIVATEKEYBLOB) {
148 PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_EXPECTING_PUBLIC_KEY_BLOB);
157 PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_BAD_VERSION_NUMBER);
160 /* Ignore reserved, aiKeyAlg */
162 *pmagic = read_ledword(&p);
163 *pbitlen = read_ledword(&p);
171 PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_EXPECTING_PRIVATE_KEY_BLOB);
180 PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_EXPECTING_PUBLIC_KEY_BLOB);
186 PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_BAD_MAGIC_NUMBER);
193 static unsigned int blob_length(unsigned bitlen, int isdss, int ispub)
195 unsigned int nbyte, hnbyte;
196 nbyte = (bitlen + 7) >> 3;
197 hnbyte = (bitlen + 15) >> 4;
201 * Expected length: 20 for q + 3 components bitlen each + 24 for seed
205 return 44 + 3 * nbyte;
207 * Expected length: 20 for q, priv, 2 bitlen components + 24 for seed
211 return 64 + 2 * nbyte;
213 /* Expected length: 4 for 'e' + 'n' */
218 * Expected length: 4 for 'e' and 7 other components. 2
219 * components are bitlen size, 5 are bitlen/2
221 return 4 + 2 * nbyte + 5 * hnbyte;
226 static EVP_PKEY *do_b2i(const unsigned char **in, unsigned int length,
229 const unsigned char *p = *in;
230 unsigned int bitlen, magic;
232 if (do_blob_header(&p, length, &magic, &bitlen, &isdss, &ispub) <= 0) {
233 PEMerr(PEM_F_DO_B2I, PEM_R_KEYBLOB_HEADER_PARSE_ERROR);
237 if (length < blob_length(bitlen, isdss, ispub)) {
238 PEMerr(PEM_F_DO_B2I, PEM_R_KEYBLOB_TOO_SHORT);
242 return b2i_dss(&p, bitlen, ispub);
244 return b2i_rsa(&p, bitlen, ispub);
247 static EVP_PKEY *do_b2i_bio(BIO *in, int ispub)
249 const unsigned char *p;
250 unsigned char hdr_buf[16], *buf = NULL;
251 unsigned int bitlen, magic, length;
253 EVP_PKEY *ret = NULL;
254 if (BIO_read(in, hdr_buf, 16) != 16) {
255 PEMerr(PEM_F_DO_B2I_BIO, PEM_R_KEYBLOB_TOO_SHORT);
259 if (do_blob_header(&p, 16, &magic, &bitlen, &isdss, &ispub) <= 0)
262 length = blob_length(bitlen, isdss, ispub);
263 buf = OPENSSL_malloc(length);
265 PEMerr(PEM_F_DO_B2I_BIO, ERR_R_MALLOC_FAILURE);
269 if (BIO_read(in, buf, length) != (int)length) {
270 PEMerr(PEM_F_DO_B2I_BIO, PEM_R_KEYBLOB_TOO_SHORT);
275 ret = b2i_dss(&p, bitlen, ispub);
277 ret = b2i_rsa(&p, bitlen, ispub);
284 static EVP_PKEY *b2i_dss(const unsigned char **in,
285 unsigned int bitlen, int ispub)
287 const unsigned char *p = *in;
288 EVP_PKEY *ret = NULL;
292 nbyte = (bitlen + 7) >> 3;
295 ret = EVP_PKEY_new();
296 if (dsa == NULL || ret == NULL)
298 if (!read_lebn(&p, nbyte, &dsa->p))
300 if (!read_lebn(&p, 20, &dsa->q))
302 if (!read_lebn(&p, nbyte, &dsa->g))
305 if (!read_lebn(&p, nbyte, &dsa->pub_key))
308 if (!read_lebn(&p, 20, &dsa->priv_key))
310 /* Calculate public key */
311 if ((dsa->pub_key = BN_new()) == NULL)
313 if ((ctx = BN_CTX_new()) == NULL)
316 if (!BN_mod_exp(dsa->pub_key, dsa->g, dsa->priv_key, dsa->p, ctx))
321 EVP_PKEY_set1_DSA(ret, dsa);
327 PEMerr(PEM_F_B2I_DSS, ERR_R_MALLOC_FAILURE);
334 static EVP_PKEY *b2i_rsa(const unsigned char **in,
335 unsigned int bitlen, int ispub)
337 const unsigned char *p = *in;
338 EVP_PKEY *ret = NULL;
340 unsigned int nbyte, hnbyte;
341 nbyte = (bitlen + 7) >> 3;
342 hnbyte = (bitlen + 15) >> 4;
344 ret = EVP_PKEY_new();
345 if (rsa == NULL || ret == NULL)
350 if (!BN_set_word(rsa->e, read_ledword(&p)))
352 if (!read_lebn(&p, nbyte, &rsa->n))
355 if (!read_lebn(&p, hnbyte, &rsa->p))
357 if (!read_lebn(&p, hnbyte, &rsa->q))
359 if (!read_lebn(&p, hnbyte, &rsa->dmp1))
361 if (!read_lebn(&p, hnbyte, &rsa->dmq1))
363 if (!read_lebn(&p, hnbyte, &rsa->iqmp))
365 if (!read_lebn(&p, nbyte, &rsa->d))
369 EVP_PKEY_set1_RSA(ret, rsa);
374 PEMerr(PEM_F_B2I_RSA, ERR_R_MALLOC_FAILURE);
380 EVP_PKEY *b2i_PrivateKey(const unsigned char **in, long length)
382 return do_b2i(in, length, 0);
385 EVP_PKEY *b2i_PublicKey(const unsigned char **in, long length)
387 return do_b2i(in, length, 1);
390 EVP_PKEY *b2i_PrivateKey_bio(BIO *in)
392 return do_b2i_bio(in, 0);
395 EVP_PKEY *b2i_PublicKey_bio(BIO *in)
397 return do_b2i_bio(in, 1);
400 static void write_ledword(unsigned char **out, unsigned int dw)
402 unsigned char *p = *out;
404 *p++ = (dw >> 8) & 0xff;
405 *p++ = (dw >> 16) & 0xff;
406 *p++ = (dw >> 24) & 0xff;
410 static void write_lebn(unsigned char **out, const BIGNUM *bn, int len)
412 BN_bn2lebinpad(bn, *out, len);
416 static int check_bitlen_rsa(RSA *rsa, int ispub, unsigned int *magic);
417 static int check_bitlen_dsa(DSA *dsa, int ispub, unsigned int *magic);
419 static void write_rsa(unsigned char **out, RSA *rsa, int ispub);
420 static void write_dsa(unsigned char **out, DSA *dsa, int ispub);
422 static int do_i2b(unsigned char **out, EVP_PKEY *pk, int ispub)
425 unsigned int bitlen, magic = 0, keyalg;
426 int outlen, noinc = 0;
427 int pktype = EVP_PKEY_id(pk);
428 if (pktype == EVP_PKEY_DSA) {
429 bitlen = check_bitlen_dsa(EVP_PKEY_get0_DSA(pk), ispub, &magic);
430 keyalg = MS_KEYALG_DSS_SIGN;
431 } else if (pktype == EVP_PKEY_RSA) {
432 bitlen = check_bitlen_rsa(EVP_PKEY_get0_RSA(pk), ispub, &magic);
433 keyalg = MS_KEYALG_RSA_KEYX;
438 outlen = 16 + blob_length(bitlen,
439 keyalg == MS_KEYALG_DSS_SIGN ? 1 : 0, ispub);
445 p = OPENSSL_malloc(outlen);
452 *p++ = MS_PUBLICKEYBLOB;
454 *p++ = MS_PRIVATEKEYBLOB;
458 write_ledword(&p, keyalg);
459 write_ledword(&p, magic);
460 write_ledword(&p, bitlen);
461 if (keyalg == MS_KEYALG_DSS_SIGN)
462 write_dsa(&p, EVP_PKEY_get0_DSA(pk), ispub);
464 write_rsa(&p, EVP_PKEY_get0_RSA(pk), ispub);
470 static int do_i2b_bio(BIO *out, EVP_PKEY *pk, int ispub)
472 unsigned char *tmp = NULL;
474 outlen = do_i2b(&tmp, pk, ispub);
477 wrlen = BIO_write(out, tmp, outlen);
484 static int check_bitlen_dsa(DSA *dsa, int ispub, unsigned int *pmagic)
487 bitlen = BN_num_bits(dsa->p);
488 if ((bitlen & 7) || (BN_num_bits(dsa->q) != 160)
489 || (BN_num_bits(dsa->g) > bitlen))
492 if (BN_num_bits(dsa->pub_key) > bitlen)
494 *pmagic = MS_DSS1MAGIC;
496 if (BN_num_bits(dsa->priv_key) > 160)
498 *pmagic = MS_DSS2MAGIC;
503 PEMerr(PEM_F_CHECK_BITLEN_DSA, PEM_R_UNSUPPORTED_KEY_COMPONENTS);
507 static int check_bitlen_rsa(RSA *rsa, int ispub, unsigned int *pmagic)
509 int nbyte, hnbyte, bitlen;
510 if (BN_num_bits(rsa->e) > 32)
512 bitlen = BN_num_bits(rsa->n);
513 nbyte = BN_num_bytes(rsa->n);
514 hnbyte = (BN_num_bits(rsa->n) + 15) >> 4;
516 *pmagic = MS_RSA1MAGIC;
519 *pmagic = MS_RSA2MAGIC;
521 * For private key each component must fit within nbyte or hnbyte.
523 if (BN_num_bytes(rsa->d) > nbyte)
525 if ((BN_num_bytes(rsa->iqmp) > hnbyte)
526 || (BN_num_bytes(rsa->p) > hnbyte)
527 || (BN_num_bytes(rsa->q) > hnbyte)
528 || (BN_num_bytes(rsa->dmp1) > hnbyte)
529 || (BN_num_bytes(rsa->dmq1) > hnbyte))
534 PEMerr(PEM_F_CHECK_BITLEN_RSA, PEM_R_UNSUPPORTED_KEY_COMPONENTS);
538 static void write_rsa(unsigned char **out, RSA *rsa, int ispub)
541 nbyte = BN_num_bytes(rsa->n);
542 hnbyte = (BN_num_bits(rsa->n) + 15) >> 4;
543 write_lebn(out, rsa->e, 4);
544 write_lebn(out, rsa->n, -1);
547 write_lebn(out, rsa->p, hnbyte);
548 write_lebn(out, rsa->q, hnbyte);
549 write_lebn(out, rsa->dmp1, hnbyte);
550 write_lebn(out, rsa->dmq1, hnbyte);
551 write_lebn(out, rsa->iqmp, hnbyte);
552 write_lebn(out, rsa->d, nbyte);
555 static void write_dsa(unsigned char **out, DSA *dsa, int ispub)
558 nbyte = BN_num_bytes(dsa->p);
559 write_lebn(out, dsa->p, nbyte);
560 write_lebn(out, dsa->q, 20);
561 write_lebn(out, dsa->g, nbyte);
563 write_lebn(out, dsa->pub_key, nbyte);
565 write_lebn(out, dsa->priv_key, 20);
566 /* Set "invalid" for seed structure values */
567 memset(*out, 0xff, 24);
572 int i2b_PrivateKey_bio(BIO *out, EVP_PKEY *pk)
574 return do_i2b_bio(out, pk, 0);
577 int i2b_PublicKey_bio(BIO *out, EVP_PKEY *pk)
579 return do_i2b_bio(out, pk, 1);
582 # ifndef OPENSSL_NO_RC4
584 static int do_PVK_header(const unsigned char **in, unsigned int length,
586 unsigned int *psaltlen, unsigned int *pkeylen)
588 const unsigned char *p = *in;
589 unsigned int pvk_magic, is_encrypted;
592 PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_PVK_TOO_SHORT);
597 PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_PVK_TOO_SHORT);
600 pvk_magic = read_ledword(&p);
601 if (pvk_magic != MS_PVKMAGIC) {
602 PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_BAD_MAGIC_NUMBER);
611 is_encrypted = read_ledword(&p);
612 *psaltlen = read_ledword(&p);
613 *pkeylen = read_ledword(&p);
615 if (*pkeylen > PVK_MAX_KEYLEN || *psaltlen > PVK_MAX_SALTLEN)
618 if (is_encrypted && !*psaltlen) {
619 PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_INCONSISTENT_HEADER);
627 static int derive_pvk_key(unsigned char *key,
628 const unsigned char *salt, unsigned int saltlen,
629 const unsigned char *pass, int passlen)
631 EVP_MD_CTX *mctx = EVP_MD_CTX_new();
634 || !EVP_DigestInit_ex(mctx, EVP_sha1(), NULL)
635 || !EVP_DigestUpdate(mctx, salt, saltlen)
636 || !EVP_DigestUpdate(mctx, pass, passlen)
637 || !EVP_DigestFinal_ex(mctx, key, NULL))
640 EVP_MD_CTX_free(mctx);
644 static EVP_PKEY *do_PVK_body(const unsigned char **in,
645 unsigned int saltlen, unsigned int keylen,
646 pem_password_cb *cb, void *u)
648 EVP_PKEY *ret = NULL;
649 const unsigned char *p = *in;
651 unsigned char *enctmp = NULL, *q;
653 EVP_CIPHER_CTX *cctx = EVP_CIPHER_CTX_new();
655 char psbuf[PEM_BUFSIZE];
656 unsigned char keybuf[20];
657 int enctmplen, inlen;
659 inlen = cb(psbuf, PEM_BUFSIZE, 0, u);
661 inlen = PEM_def_callback(psbuf, PEM_BUFSIZE, 0, u);
663 PEMerr(PEM_F_DO_PVK_BODY, PEM_R_BAD_PASSWORD_READ);
666 enctmp = OPENSSL_malloc(keylen + 8);
667 if (enctmp == NULL) {
668 PEMerr(PEM_F_DO_PVK_BODY, ERR_R_MALLOC_FAILURE);
671 if (!derive_pvk_key(keybuf, p, saltlen,
672 (unsigned char *)psbuf, inlen))
675 /* Copy BLOBHEADER across, decrypt rest */
676 memcpy(enctmp, p, 8);
679 PEMerr(PEM_F_DO_PVK_BODY, PEM_R_PVK_TOO_SHORT);
684 if (!EVP_DecryptInit_ex(cctx, EVP_rc4(), NULL, keybuf, NULL))
686 if (!EVP_DecryptUpdate(cctx, q, &enctmplen, p, inlen))
688 if (!EVP_DecryptFinal_ex(cctx, q + enctmplen, &enctmplen))
690 magic = read_ledword((const unsigned char **)&q);
691 if (magic != MS_RSA2MAGIC && magic != MS_DSS2MAGIC) {
693 memset(keybuf + 5, 0, 11);
694 if (!EVP_DecryptInit_ex(cctx, EVP_rc4(), NULL, keybuf, NULL))
696 OPENSSL_cleanse(keybuf, 20);
697 if (!EVP_DecryptUpdate(cctx, q, &enctmplen, p, inlen))
699 if (!EVP_DecryptFinal_ex(cctx, q + enctmplen, &enctmplen))
701 magic = read_ledword((const unsigned char **)&q);
702 if (magic != MS_RSA2MAGIC && magic != MS_DSS2MAGIC) {
703 PEMerr(PEM_F_DO_PVK_BODY, PEM_R_BAD_DECRYPT);
707 OPENSSL_cleanse(keybuf, 20);
711 ret = b2i_PrivateKey(&p, keylen);
713 EVP_CIPHER_CTX_free(cctx);
714 OPENSSL_free(enctmp);
718 EVP_PKEY *b2i_PVK_bio(BIO *in, pem_password_cb *cb, void *u)
720 unsigned char pvk_hdr[24], *buf = NULL;
721 const unsigned char *p;
723 EVP_PKEY *ret = NULL;
724 unsigned int saltlen, keylen;
725 if (BIO_read(in, pvk_hdr, 24) != 24) {
726 PEMerr(PEM_F_B2I_PVK_BIO, PEM_R_PVK_DATA_TOO_SHORT);
731 if (!do_PVK_header(&p, 24, 0, &saltlen, &keylen))
733 buflen = (int)keylen + saltlen;
734 buf = OPENSSL_malloc(buflen);
736 PEMerr(PEM_F_B2I_PVK_BIO, ERR_R_MALLOC_FAILURE);
740 if (BIO_read(in, buf, buflen) != buflen) {
741 PEMerr(PEM_F_B2I_PVK_BIO, PEM_R_PVK_DATA_TOO_SHORT);
744 ret = do_PVK_body(&p, saltlen, keylen, cb, u);
747 OPENSSL_clear_free(buf, buflen);
751 static int i2b_PVK(unsigned char **out, EVP_PKEY *pk, int enclevel,
752 pem_password_cb *cb, void *u)
754 int outlen = 24, pklen;
755 unsigned char *p, *salt = NULL;
756 EVP_CIPHER_CTX *cctx = EVP_CIPHER_CTX_new();
758 outlen += PVK_SALTLEN;
759 pklen = do_i2b(NULL, pk, 0);
768 p = OPENSSL_malloc(outlen);
770 PEMerr(PEM_F_I2B_PVK, ERR_R_MALLOC_FAILURE);
776 write_ledword(&p, MS_PVKMAGIC);
777 write_ledword(&p, 0);
778 if (EVP_PKEY_id(pk) == EVP_PKEY_DSA)
779 write_ledword(&p, MS_KEYTYPE_SIGN);
781 write_ledword(&p, MS_KEYTYPE_KEYX);
782 write_ledword(&p, enclevel ? 1 : 0);
783 write_ledword(&p, enclevel ? PVK_SALTLEN : 0);
784 write_ledword(&p, pklen);
786 if (RAND_bytes(p, PVK_SALTLEN) <= 0)
795 char psbuf[PEM_BUFSIZE];
796 unsigned char keybuf[20];
797 int enctmplen, inlen;
799 inlen = cb(psbuf, PEM_BUFSIZE, 1, u);
801 inlen = PEM_def_callback(psbuf, PEM_BUFSIZE, 1, u);
803 PEMerr(PEM_F_I2B_PVK, PEM_R_BAD_PASSWORD_READ);
806 if (!derive_pvk_key(keybuf, salt, PVK_SALTLEN,
807 (unsigned char *)psbuf, inlen))
810 memset(keybuf + 5, 0, 11);
811 p = salt + PVK_SALTLEN + 8;
812 if (!EVP_EncryptInit_ex(cctx, EVP_rc4(), NULL, keybuf, NULL))
814 OPENSSL_cleanse(keybuf, 20);
815 if (!EVP_DecryptUpdate(cctx, p, &enctmplen, p, pklen - 8))
817 if (!EVP_DecryptFinal_ex(cctx, p + enctmplen, &enctmplen))
820 EVP_CIPHER_CTX_free(cctx);
824 EVP_CIPHER_CTX_free(cctx);
828 int i2b_PVK_bio(BIO *out, EVP_PKEY *pk, int enclevel,
829 pem_password_cb *cb, void *u)
831 unsigned char *tmp = NULL;
833 outlen = i2b_PVK(&tmp, pk, enclevel, cb, u);
836 wrlen = BIO_write(out, tmp, outlen);
838 if (wrlen == outlen) {
839 PEMerr(PEM_F_I2B_PVK_BIO, PEM_R_BIO_WRITE_FAILURE);