2 * Copyright 2005-2020 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
11 * Support for PVK format keys and related structures (such a PUBLICKEYBLOB
12 * and PRIVATEKEYBLOB).
16 * DSA low level APIs are deprecated for public use, but still ok for
19 #include "internal/deprecated.h"
21 #include "internal/cryptlib.h"
22 #include <openssl/pem.h>
23 #include <openssl/rand.h>
24 #include <openssl/bn.h>
25 #if !defined(OPENSSL_NO_RSA) && !defined(OPENSSL_NO_DSA)
26 # include <openssl/dsa.h>
27 # include <openssl/rsa.h>
30 * Utility function: read a DWORD (4 byte unsigned integer) in little endian
34 static unsigned int read_ledword(const unsigned char **in)
36 const unsigned char *p = *in;
47 * Read a BIGNUM in little endian format. The docs say that this should take
51 static int read_lebn(const unsigned char **in, unsigned int nbyte, BIGNUM **r)
53 *r = BN_lebin2bn(*in, nbyte, NULL);
60 /* Convert private key blob to EVP_PKEY: RSA and DSA keys supported */
62 # define MS_PUBLICKEYBLOB 0x6
63 # define MS_PRIVATEKEYBLOB 0x7
64 # define MS_RSA1MAGIC 0x31415352L
65 # define MS_RSA2MAGIC 0x32415352L
66 # define MS_DSS1MAGIC 0x31535344L
67 # define MS_DSS2MAGIC 0x32535344L
69 # define MS_KEYALG_RSA_KEYX 0xa400
70 # define MS_KEYALG_DSS_SIGN 0x2200
72 # define MS_KEYTYPE_KEYX 0x1
73 # define MS_KEYTYPE_SIGN 0x2
75 /* Maximum length of a blob after header */
76 # define BLOB_MAX_LENGTH 102400
78 /* The PVK file magic number: seems to spell out "bobsfile", who is Bob? */
79 # define MS_PVKMAGIC 0xb0b5f11eL
80 /* Salt length for PVK files */
81 # define PVK_SALTLEN 0x10
82 /* Maximum length in PVK header */
83 # define PVK_MAX_KEYLEN 102400
84 /* Maximum salt length */
85 # define PVK_MAX_SALTLEN 10240
87 static EVP_PKEY *b2i_rsa(const unsigned char **in,
88 unsigned int bitlen, int ispub);
89 static EVP_PKEY *b2i_dss(const unsigned char **in,
90 unsigned int bitlen, int ispub);
92 static int do_blob_header(const unsigned char **in, unsigned int length,
93 unsigned int *pmagic, unsigned int *pbitlen,
94 int *pisdss, int *pispub)
96 const unsigned char *p = *in;
100 if (*p == MS_PUBLICKEYBLOB) {
102 PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_EXPECTING_PRIVATE_KEY_BLOB);
106 } else if (*p == MS_PRIVATEKEYBLOB) {
108 PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_EXPECTING_PUBLIC_KEY_BLOB);
117 PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_BAD_VERSION_NUMBER);
120 /* Ignore reserved, aiKeyAlg */
122 *pmagic = read_ledword(&p);
123 *pbitlen = read_ledword(&p);
132 PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_EXPECTING_PRIVATE_KEY_BLOB);
142 PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_EXPECTING_PUBLIC_KEY_BLOB);
148 PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_BAD_MAGIC_NUMBER);
155 static unsigned int blob_length(unsigned bitlen, int isdss, int ispub)
157 unsigned int nbyte, hnbyte;
158 nbyte = (bitlen + 7) >> 3;
159 hnbyte = (bitlen + 15) >> 4;
163 * Expected length: 20 for q + 3 components bitlen each + 24 for seed
167 return 44 + 3 * nbyte;
169 * Expected length: 20 for q, priv, 2 bitlen components + 24 for seed
173 return 64 + 2 * nbyte;
175 /* Expected length: 4 for 'e' + 'n' */
180 * Expected length: 4 for 'e' and 7 other components. 2
181 * components are bitlen size, 5 are bitlen/2
183 return 4 + 2 * nbyte + 5 * hnbyte;
188 static EVP_PKEY *do_b2i(const unsigned char **in, unsigned int length,
191 const unsigned char *p = *in;
192 unsigned int bitlen, magic;
194 if (do_blob_header(&p, length, &magic, &bitlen, &isdss, &ispub) <= 0) {
195 PEMerr(PEM_F_DO_B2I, PEM_R_KEYBLOB_HEADER_PARSE_ERROR);
199 if (length < blob_length(bitlen, isdss, ispub)) {
200 PEMerr(PEM_F_DO_B2I, PEM_R_KEYBLOB_TOO_SHORT);
204 return b2i_dss(&p, bitlen, ispub);
206 return b2i_rsa(&p, bitlen, ispub);
209 static EVP_PKEY *do_b2i_bio(BIO *in, int ispub)
211 const unsigned char *p;
212 unsigned char hdr_buf[16], *buf = NULL;
213 unsigned int bitlen, magic, length;
215 EVP_PKEY *ret = NULL;
216 if (BIO_read(in, hdr_buf, 16) != 16) {
217 PEMerr(PEM_F_DO_B2I_BIO, PEM_R_KEYBLOB_TOO_SHORT);
221 if (do_blob_header(&p, 16, &magic, &bitlen, &isdss, &ispub) <= 0)
224 length = blob_length(bitlen, isdss, ispub);
225 if (length > BLOB_MAX_LENGTH) {
226 PEMerr(PEM_F_DO_B2I_BIO, PEM_R_HEADER_TOO_LONG);
229 buf = OPENSSL_malloc(length);
231 PEMerr(PEM_F_DO_B2I_BIO, ERR_R_MALLOC_FAILURE);
235 if (BIO_read(in, buf, length) != (int)length) {
236 PEMerr(PEM_F_DO_B2I_BIO, PEM_R_KEYBLOB_TOO_SHORT);
241 ret = b2i_dss(&p, bitlen, ispub);
243 ret = b2i_rsa(&p, bitlen, ispub);
250 static EVP_PKEY *b2i_dss(const unsigned char **in,
251 unsigned int bitlen, int ispub)
253 const unsigned char *p = *in;
254 EVP_PKEY *ret = NULL;
258 BIGNUM *pbn = NULL, *qbn = NULL, *gbn = NULL, *priv_key = NULL;
259 BIGNUM *pub_key = NULL;
261 nbyte = (bitlen + 7) >> 3;
264 ret = EVP_PKEY_new();
265 if (dsa == NULL || ret == NULL)
267 if (!read_lebn(&p, nbyte, &pbn))
270 if (!read_lebn(&p, 20, &qbn))
273 if (!read_lebn(&p, nbyte, &gbn))
277 if (!read_lebn(&p, nbyte, &pub_key))
280 if (!read_lebn(&p, 20, &priv_key))
283 /* Set constant time flag before public key calculation */
284 BN_set_flags(priv_key, BN_FLG_CONSTTIME);
286 /* Calculate public key */
290 if ((ctx = BN_CTX_new()) == NULL)
293 if (!BN_mod_exp(pub_key, gbn, priv_key, pbn, ctx))
299 if (!DSA_set0_pqg(dsa, pbn, qbn, gbn))
301 pbn = qbn = gbn = NULL;
302 if (!DSA_set0_key(dsa, pub_key, priv_key))
304 pub_key = priv_key = NULL;
306 if (!EVP_PKEY_set1_DSA(ret, dsa))
313 PEMerr(PEM_F_B2I_DSS, ERR_R_MALLOC_FAILURE);
325 static EVP_PKEY *b2i_rsa(const unsigned char **in,
326 unsigned int bitlen, int ispub)
328 const unsigned char *pin = *in;
329 EVP_PKEY *ret = NULL;
330 BIGNUM *e = NULL, *n = NULL, *d = NULL;
331 BIGNUM *p = NULL, *q = NULL, *dmp1 = NULL, *dmq1 = NULL, *iqmp = NULL;
333 unsigned int nbyte, hnbyte;
334 nbyte = (bitlen + 7) >> 3;
335 hnbyte = (bitlen + 15) >> 4;
337 ret = EVP_PKEY_new();
338 if (rsa == NULL || ret == NULL)
343 if (!BN_set_word(e, read_ledword(&pin)))
345 if (!read_lebn(&pin, nbyte, &n))
348 if (!read_lebn(&pin, hnbyte, &p))
350 if (!read_lebn(&pin, hnbyte, &q))
352 if (!read_lebn(&pin, hnbyte, &dmp1))
354 if (!read_lebn(&pin, hnbyte, &dmq1))
356 if (!read_lebn(&pin, hnbyte, &iqmp))
358 if (!read_lebn(&pin, nbyte, &d))
360 if (!RSA_set0_factors(rsa, p, q))
363 if (!RSA_set0_crt_params(rsa, dmp1, dmq1, iqmp))
365 dmp1 = dmq1 = iqmp = NULL;
367 if (!RSA_set0_key(rsa, n, e, d))
371 if (!EVP_PKEY_set1_RSA(ret, rsa))
377 PEMerr(PEM_F_B2I_RSA, ERR_R_MALLOC_FAILURE);
391 EVP_PKEY *b2i_PrivateKey(const unsigned char **in, long length)
393 return do_b2i(in, length, 0);
396 EVP_PKEY *b2i_PublicKey(const unsigned char **in, long length)
398 return do_b2i(in, length, 1);
401 EVP_PKEY *b2i_PrivateKey_bio(BIO *in)
403 return do_b2i_bio(in, 0);
406 EVP_PKEY *b2i_PublicKey_bio(BIO *in)
408 return do_b2i_bio(in, 1);
411 static void write_ledword(unsigned char **out, unsigned int dw)
413 unsigned char *p = *out;
415 *p++ = (dw >> 8) & 0xff;
416 *p++ = (dw >> 16) & 0xff;
417 *p++ = (dw >> 24) & 0xff;
421 static void write_lebn(unsigned char **out, const BIGNUM *bn, int len)
423 BN_bn2lebinpad(bn, *out, len);
427 static int check_bitlen_rsa(RSA *rsa, int ispub, unsigned int *magic);
428 static int check_bitlen_dsa(DSA *dsa, int ispub, unsigned int *magic);
430 static void write_rsa(unsigned char **out, RSA *rsa, int ispub);
431 static void write_dsa(unsigned char **out, DSA *dsa, int ispub);
433 static int do_i2b(unsigned char **out, const EVP_PKEY *pk, int ispub)
436 unsigned int bitlen, magic = 0, keyalg;
437 int outlen, noinc = 0;
438 int pktype = EVP_PKEY_id(pk);
439 if (pktype == EVP_PKEY_DSA) {
440 bitlen = check_bitlen_dsa(EVP_PKEY_get0_DSA(pk), ispub, &magic);
441 keyalg = MS_KEYALG_DSS_SIGN;
442 } else if (pktype == EVP_PKEY_RSA) {
443 bitlen = check_bitlen_rsa(EVP_PKEY_get0_RSA(pk), ispub, &magic);
444 keyalg = MS_KEYALG_RSA_KEYX;
449 outlen = 16 + blob_length(bitlen,
450 keyalg == MS_KEYALG_DSS_SIGN ? 1 : 0, ispub);
456 if ((p = OPENSSL_malloc(outlen)) == NULL) {
457 PEMerr(PEM_F_DO_I2B, ERR_R_MALLOC_FAILURE);
464 *p++ = MS_PUBLICKEYBLOB;
466 *p++ = MS_PRIVATEKEYBLOB;
470 write_ledword(&p, keyalg);
471 write_ledword(&p, magic);
472 write_ledword(&p, bitlen);
473 if (keyalg == MS_KEYALG_DSS_SIGN)
474 write_dsa(&p, EVP_PKEY_get0_DSA(pk), ispub);
476 write_rsa(&p, EVP_PKEY_get0_RSA(pk), ispub);
482 static int do_i2b_bio(BIO *out, const EVP_PKEY *pk, int ispub)
484 unsigned char *tmp = NULL;
486 outlen = do_i2b(&tmp, pk, ispub);
489 wrlen = BIO_write(out, tmp, outlen);
496 static int check_bitlen_dsa(DSA *dsa, int ispub, unsigned int *pmagic)
499 const BIGNUM *p = NULL, *q = NULL, *g = NULL;
500 const BIGNUM *pub_key = NULL, *priv_key = NULL;
502 DSA_get0_pqg(dsa, &p, &q, &g);
503 DSA_get0_key(dsa, &pub_key, &priv_key);
504 bitlen = BN_num_bits(p);
505 if ((bitlen & 7) || (BN_num_bits(q) != 160)
506 || (BN_num_bits(g) > bitlen))
509 if (BN_num_bits(pub_key) > bitlen)
511 *pmagic = MS_DSS1MAGIC;
513 if (BN_num_bits(priv_key) > 160)
515 *pmagic = MS_DSS2MAGIC;
520 PEMerr(PEM_F_CHECK_BITLEN_DSA, PEM_R_UNSUPPORTED_KEY_COMPONENTS);
524 static int check_bitlen_rsa(RSA *rsa, int ispub, unsigned int *pmagic)
526 int nbyte, hnbyte, bitlen;
529 RSA_get0_key(rsa, NULL, &e, NULL);
530 if (BN_num_bits(e) > 32)
532 bitlen = RSA_bits(rsa);
533 nbyte = RSA_size(rsa);
534 hnbyte = (bitlen + 15) >> 4;
536 *pmagic = MS_RSA1MAGIC;
539 const BIGNUM *d, *p, *q, *iqmp, *dmp1, *dmq1;
541 *pmagic = MS_RSA2MAGIC;
544 * For private key each component must fit within nbyte or hnbyte.
546 RSA_get0_key(rsa, NULL, NULL, &d);
547 if (BN_num_bytes(d) > nbyte)
549 RSA_get0_factors(rsa, &p, &q);
550 RSA_get0_crt_params(rsa, &dmp1, &dmq1, &iqmp);
551 if ((BN_num_bytes(iqmp) > hnbyte)
552 || (BN_num_bytes(p) > hnbyte)
553 || (BN_num_bytes(q) > hnbyte)
554 || (BN_num_bytes(dmp1) > hnbyte)
555 || (BN_num_bytes(dmq1) > hnbyte))
560 PEMerr(PEM_F_CHECK_BITLEN_RSA, PEM_R_UNSUPPORTED_KEY_COMPONENTS);
564 static void write_rsa(unsigned char **out, RSA *rsa, int ispub)
567 const BIGNUM *n, *d, *e, *p, *q, *iqmp, *dmp1, *dmq1;
569 nbyte = RSA_size(rsa);
570 hnbyte = (RSA_bits(rsa) + 15) >> 4;
571 RSA_get0_key(rsa, &n, &e, &d);
572 write_lebn(out, e, 4);
573 write_lebn(out, n, nbyte);
576 RSA_get0_factors(rsa, &p, &q);
577 RSA_get0_crt_params(rsa, &dmp1, &dmq1, &iqmp);
578 write_lebn(out, p, hnbyte);
579 write_lebn(out, q, hnbyte);
580 write_lebn(out, dmp1, hnbyte);
581 write_lebn(out, dmq1, hnbyte);
582 write_lebn(out, iqmp, hnbyte);
583 write_lebn(out, d, nbyte);
586 static void write_dsa(unsigned char **out, DSA *dsa, int ispub)
589 const BIGNUM *p = NULL, *q = NULL, *g = NULL;
590 const BIGNUM *pub_key = NULL, *priv_key = NULL;
592 DSA_get0_pqg(dsa, &p, &q, &g);
593 DSA_get0_key(dsa, &pub_key, &priv_key);
594 nbyte = BN_num_bytes(p);
595 write_lebn(out, p, nbyte);
596 write_lebn(out, q, 20);
597 write_lebn(out, g, nbyte);
599 write_lebn(out, pub_key, nbyte);
601 write_lebn(out, priv_key, 20);
602 /* Set "invalid" for seed structure values */
603 memset(*out, 0xff, 24);
608 int i2b_PrivateKey_bio(BIO *out, const EVP_PKEY *pk)
610 return do_i2b_bio(out, pk, 0);
613 int i2b_PublicKey_bio(BIO *out, const EVP_PKEY *pk)
615 return do_i2b_bio(out, pk, 1);
618 # ifndef OPENSSL_NO_RC4
620 static int do_PVK_header(const unsigned char **in, unsigned int length,
622 unsigned int *psaltlen, unsigned int *pkeylen)
624 const unsigned char *p = *in;
625 unsigned int pvk_magic, is_encrypted;
629 PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_PVK_TOO_SHORT);
634 PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_PVK_TOO_SHORT);
637 pvk_magic = read_ledword(&p);
638 if (pvk_magic != MS_PVKMAGIC) {
639 PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_BAD_MAGIC_NUMBER);
648 is_encrypted = read_ledword(&p);
649 *psaltlen = read_ledword(&p);
650 *pkeylen = read_ledword(&p);
652 if (*pkeylen > PVK_MAX_KEYLEN || *psaltlen > PVK_MAX_SALTLEN)
655 if (is_encrypted && *psaltlen == 0) {
656 PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_INCONSISTENT_HEADER);
664 static int derive_pvk_key(unsigned char *key,
665 const unsigned char *salt, unsigned int saltlen,
666 const unsigned char *pass, int passlen)
668 EVP_MD_CTX *mctx = EVP_MD_CTX_new();
671 || !EVP_DigestInit_ex(mctx, EVP_sha1(), NULL)
672 || !EVP_DigestUpdate(mctx, salt, saltlen)
673 || !EVP_DigestUpdate(mctx, pass, passlen)
674 || !EVP_DigestFinal_ex(mctx, key, NULL))
677 EVP_MD_CTX_free(mctx);
681 static EVP_PKEY *do_PVK_body(const unsigned char **in,
682 unsigned int saltlen, unsigned int keylen,
683 pem_password_cb *cb, void *u)
685 EVP_PKEY *ret = NULL;
686 const unsigned char *p = *in;
688 unsigned char *enctmp = NULL, *q;
689 unsigned char keybuf[20];
691 EVP_CIPHER_CTX *cctx = EVP_CIPHER_CTX_new();
693 char psbuf[PEM_BUFSIZE];
694 int enctmplen, inlen;
696 inlen = cb(psbuf, PEM_BUFSIZE, 0, u);
698 inlen = PEM_def_callback(psbuf, PEM_BUFSIZE, 0, u);
700 PEMerr(PEM_F_DO_PVK_BODY, PEM_R_BAD_PASSWORD_READ);
703 enctmp = OPENSSL_malloc(keylen + 8);
704 if (enctmp == NULL) {
705 PEMerr(PEM_F_DO_PVK_BODY, ERR_R_MALLOC_FAILURE);
708 if (!derive_pvk_key(keybuf, p, saltlen,
709 (unsigned char *)psbuf, inlen))
712 /* Copy BLOBHEADER across, decrypt rest */
713 memcpy(enctmp, p, 8);
716 PEMerr(PEM_F_DO_PVK_BODY, PEM_R_PVK_TOO_SHORT);
721 if (!EVP_DecryptInit_ex(cctx, EVP_rc4(), NULL, keybuf, NULL))
723 if (!EVP_DecryptUpdate(cctx, q, &enctmplen, p, inlen))
725 if (!EVP_DecryptFinal_ex(cctx, q + enctmplen, &enctmplen))
727 magic = read_ledword((const unsigned char **)&q);
728 if (magic != MS_RSA2MAGIC && magic != MS_DSS2MAGIC) {
730 memset(keybuf + 5, 0, 11);
731 if (!EVP_DecryptInit_ex(cctx, EVP_rc4(), NULL, keybuf, NULL))
733 if (!EVP_DecryptUpdate(cctx, q, &enctmplen, p, inlen))
735 if (!EVP_DecryptFinal_ex(cctx, q + enctmplen, &enctmplen))
737 magic = read_ledword((const unsigned char **)&q);
738 if (magic != MS_RSA2MAGIC && magic != MS_DSS2MAGIC) {
739 PEMerr(PEM_F_DO_PVK_BODY, PEM_R_BAD_DECRYPT);
746 ret = b2i_PrivateKey(&p, keylen);
748 EVP_CIPHER_CTX_free(cctx);
749 if (enctmp != NULL) {
750 OPENSSL_cleanse(keybuf, sizeof(keybuf));
751 OPENSSL_free(enctmp);
756 EVP_PKEY *b2i_PVK_bio(BIO *in, pem_password_cb *cb, void *u)
758 unsigned char pvk_hdr[24], *buf = NULL;
759 const unsigned char *p;
761 EVP_PKEY *ret = NULL;
762 unsigned int saltlen, keylen;
763 if (BIO_read(in, pvk_hdr, 24) != 24) {
764 PEMerr(PEM_F_B2I_PVK_BIO, PEM_R_PVK_DATA_TOO_SHORT);
769 if (!do_PVK_header(&p, 24, 0, &saltlen, &keylen))
771 buflen = (int)keylen + saltlen;
772 buf = OPENSSL_malloc(buflen);
774 PEMerr(PEM_F_B2I_PVK_BIO, ERR_R_MALLOC_FAILURE);
778 if (BIO_read(in, buf, buflen) != buflen) {
779 PEMerr(PEM_F_B2I_PVK_BIO, PEM_R_PVK_DATA_TOO_SHORT);
782 ret = do_PVK_body(&p, saltlen, keylen, cb, u);
785 OPENSSL_clear_free(buf, buflen);
789 static int i2b_PVK(unsigned char **out, const EVP_PKEY *pk, int enclevel,
790 pem_password_cb *cb, void *u)
792 int outlen = 24, pklen;
793 unsigned char *p = NULL, *start = NULL, *salt = NULL;
794 EVP_CIPHER_CTX *cctx = NULL;
796 outlen += PVK_SALTLEN;
797 pklen = do_i2b(NULL, pk, 0);
806 start = p = OPENSSL_malloc(outlen);
808 PEMerr(PEM_F_I2B_PVK, ERR_R_MALLOC_FAILURE);
813 cctx = EVP_CIPHER_CTX_new();
817 write_ledword(&p, MS_PVKMAGIC);
818 write_ledword(&p, 0);
819 if (EVP_PKEY_id(pk) == EVP_PKEY_DSA)
820 write_ledword(&p, MS_KEYTYPE_SIGN);
822 write_ledword(&p, MS_KEYTYPE_KEYX);
823 write_ledword(&p, enclevel ? 1 : 0);
824 write_ledword(&p, enclevel ? PVK_SALTLEN : 0);
825 write_ledword(&p, pklen);
827 if (RAND_bytes(p, PVK_SALTLEN) <= 0)
834 char psbuf[PEM_BUFSIZE];
835 unsigned char keybuf[20];
836 int enctmplen, inlen;
838 inlen = cb(psbuf, PEM_BUFSIZE, 1, u);
840 inlen = PEM_def_callback(psbuf, PEM_BUFSIZE, 1, u);
842 PEMerr(PEM_F_I2B_PVK, PEM_R_BAD_PASSWORD_READ);
845 if (!derive_pvk_key(keybuf, salt, PVK_SALTLEN,
846 (unsigned char *)psbuf, inlen))
849 memset(keybuf + 5, 0, 11);
850 p = salt + PVK_SALTLEN + 8;
851 if (!EVP_EncryptInit_ex(cctx, EVP_rc4(), NULL, keybuf, NULL))
853 OPENSSL_cleanse(keybuf, 20);
854 if (!EVP_DecryptUpdate(cctx, p, &enctmplen, p, pklen - 8))
856 if (!EVP_DecryptFinal_ex(cctx, p + enctmplen, &enctmplen))
860 EVP_CIPHER_CTX_free(cctx);
868 EVP_CIPHER_CTX_free(cctx);
874 int i2b_PVK_bio(BIO *out, const EVP_PKEY *pk, int enclevel,
875 pem_password_cb *cb, void *u)
877 unsigned char *tmp = NULL;
879 outlen = i2b_PVK(&tmp, pk, enclevel, cb, u);
882 wrlen = BIO_write(out, tmp, outlen);
884 if (wrlen == outlen) {
885 PEMerr(PEM_F_I2B_PVK_BIO, PEM_R_BIO_WRITE_FAILURE);