/* $OpenBSD: pvkfmt.c,v 1.30 2025/06/07 09:32:35 tb Exp $ */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project 2005.
 */
/* ====================================================================
 * Copyright (c) 2005 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

/* Support for PVK format keys and related structures (such a PUBLICKEYBLOB
 * and PRIVATEKEYBLOB).
 */

#include <stdlib.h>
#include <string.h>

#include <openssl/opensslconf.h>

#include <openssl/bn.h>
#include <openssl/pem.h>

#if !defined(OPENSSL_NO_RSA) && !defined(OPENSSL_NO_DSA)
#include <openssl/dsa.h>
#include <openssl/rsa.h>

#include "bn_local.h"
#include "dsa_local.h"
#include "err_local.h"
#include "evp_local.h"
#include "rsa_local.h"

/* Utility function: read a DWORD (4 byte unsigned integer) in little endian
 * format
 */

static unsigned int
read_ledword(const unsigned char **in)
{
        const unsigned char *p = *in;
        unsigned int ret;

        ret = *p++;
        ret |= (*p++ << 8);
        ret |= (*p++ << 16);
        ret |= (*p++ << 24);
        *in = p;
        return ret;
}

/* Read a BIGNUM in little endian format. The docs say that this should take up
 * bitlen/8 bytes.
 */

static int
read_lebn(const unsigned char **in, unsigned int nbyte, BIGNUM **r)
{
        const unsigned char *p;
        unsigned char *tmpbuf, *q;
        unsigned int i;

        p = *in + nbyte - 1;
        tmpbuf = malloc(nbyte);
        if (!tmpbuf)
                return 0;
        q = tmpbuf;
        for (i = 0; i < nbyte; i++)
                *q++ = *p--;
        *r = BN_bin2bn(tmpbuf, nbyte, NULL);
        free(tmpbuf);
        if (*r) {
                *in += nbyte;
                return 1;
        } else
                return 0;
}


/* Convert private key blob to EVP_PKEY: RSA and DSA keys supported */

#define MS_PUBLICKEYBLOB        0x6
#define MS_PRIVATEKEYBLOB       0x7
#define MS_RSA1MAGIC            0x31415352L
#define MS_RSA2MAGIC            0x32415352L
#define MS_DSS1MAGIC            0x31535344L
#define MS_DSS2MAGIC            0x32535344L

#define MS_KEYALG_RSA_KEYX      0xa400
#define MS_KEYALG_DSS_SIGN      0x2200

#define MS_KEYTYPE_KEYX         0x1
#define MS_KEYTYPE_SIGN         0x2

/* The PVK file magic number: seems to spell out "bobsfile", who is Bob? */
#define MS_PVKMAGIC             0xb0b5f11eL
/* Salt length for PVK files */
#define PVK_SALTLEN             0x10

static EVP_PKEY *b2i_rsa(const unsigned char **in, unsigned int length,
    unsigned int bitlen, int ispub);
static EVP_PKEY *b2i_dss(const unsigned char **in, unsigned int length,
    unsigned int bitlen, int ispub);

static int
do_blob_header(const unsigned char **in, unsigned int length,
    unsigned int *pmagic, unsigned int *pbitlen, int *pisdss, int *pispub)
{
        const unsigned char *p = *in;

        if (length < 16)
                return 0;
        /* bType */
        if (*p == MS_PUBLICKEYBLOB) {
                if (*pispub == 0) {
                        PEMerror(PEM_R_EXPECTING_PRIVATE_KEY_BLOB);
                        return 0;
                }
                *pispub = 1;
        } else if (*p == MS_PRIVATEKEYBLOB) {
                if (*pispub == 1) {
                        PEMerror(PEM_R_EXPECTING_PUBLIC_KEY_BLOB);
                        return 0;
                }
                *pispub = 0;
        } else
                return 0;
        p++;
        /* Version */
        if (*p++ != 0x2) {
                PEMerror(PEM_R_BAD_VERSION_NUMBER);
                return 0;
        }
        /* Ignore reserved, aiKeyAlg */
        p += 6;
        *pmagic = read_ledword(&p);
        *pbitlen = read_ledword(&p);
        if (*pbitlen > 65536) {
                PEMerror(PEM_R_INCONSISTENT_HEADER);
                return 0;
        }
        *pisdss = 0;
        switch (*pmagic) {

        case MS_DSS1MAGIC:
                *pisdss = 1;
        case MS_RSA1MAGIC:
                if (*pispub == 0) {
                        PEMerror(PEM_R_EXPECTING_PRIVATE_KEY_BLOB);
                        return 0;
                }
                break;

        case MS_DSS2MAGIC:
                *pisdss = 1;
        case MS_RSA2MAGIC:
                if (*pispub == 1) {
                        PEMerror(PEM_R_EXPECTING_PUBLIC_KEY_BLOB);
                        return 0;
                }
                break;

        default:
                PEMerror(PEM_R_BAD_MAGIC_NUMBER);
                return -1;
        }
        *in = p;
        return 1;
}

static unsigned int
blob_length(unsigned bitlen, int isdss, int ispub)
{
        unsigned int nbyte, hnbyte;

        nbyte = (bitlen + 7) >> 3;
        hnbyte = (bitlen + 15) >> 4;
        if (isdss) {

                /* Expected length: 20 for q + 3 components bitlen each + 24
                 * for seed structure.
                 */
                if (ispub)
                        return 44 + 3 * nbyte;
                /* Expected length: 20 for q, priv, 2 bitlen components + 24
                 * for seed structure.
                 */
                else
                        return 64 + 2 * nbyte;
        } else {
                /* Expected length: 4 for 'e' + 'n' */
                if (ispub)
                        return 4 + nbyte;
                else
                /* Expected length: 4 for 'e' and 7 other components.
                 * 2 components are bitlen size, 5 are bitlen/2
                 */
                                return 4 + 2*nbyte + 5*hnbyte;
        }

}

static EVP_PKEY *
do_b2i(const unsigned char **in, unsigned int length, int ispub)
{
        const unsigned char *p = *in;
        unsigned int bitlen, magic;
        int isdss;

        if (do_blob_header(&p, length, &magic, &bitlen, &isdss, &ispub) <= 0) {
                PEMerror(PEM_R_KEYBLOB_HEADER_PARSE_ERROR);
                return NULL;
        }
        length -= 16;
        if (length < blob_length(bitlen, isdss, ispub)) {
                PEMerror(PEM_R_KEYBLOB_TOO_SHORT);
                return NULL;
        }
        if (isdss)
                return b2i_dss(&p, length, bitlen, ispub);
        else
                return b2i_rsa(&p, length, bitlen, ispub);
}

static EVP_PKEY *
do_b2i_bio(BIO *in, int ispub)
{
        const unsigned char *p;
        unsigned char hdr_buf[16], *buf = NULL;
        unsigned int bitlen, magic, length;
        int isdss;
        EVP_PKEY *ret = NULL;

        if (BIO_read(in, hdr_buf, 16) != 16) {
                PEMerror(PEM_R_KEYBLOB_TOO_SHORT);
                return NULL;
        }
        p = hdr_buf;
        if (do_blob_header(&p, 16, &magic, &bitlen, &isdss, &ispub) <= 0)
                return NULL;

        length = blob_length(bitlen, isdss, ispub);
        buf = malloc(length);
        if (!buf) {
                PEMerror(ERR_R_MALLOC_FAILURE);
                goto err;
        }
        p = buf;
        if (BIO_read(in, buf, length) != (int)length) {
                PEMerror(PEM_R_KEYBLOB_TOO_SHORT);
                goto err;
        }

        if (isdss)
                ret = b2i_dss(&p, length, bitlen, ispub);
        else
                ret = b2i_rsa(&p, length, bitlen, ispub);

 err:
        free(buf);
        return ret;
}

static EVP_PKEY *
b2i_dss(const unsigned char **in, unsigned int length, unsigned int bitlen,
    int ispub)
{
        const unsigned char *p = *in;
        EVP_PKEY *ret = NULL;
        DSA *dsa = NULL;
        BN_CTX *ctx = NULL;
        unsigned int nbyte;

        nbyte = (bitlen + 7) >> 3;

        dsa = DSA_new();
        ret = EVP_PKEY_new();
        if (!dsa || !ret)
                goto err;
        if (!read_lebn(&p, nbyte, &dsa->p))
                goto err;
        if (!read_lebn(&p, 20, &dsa->q))
                goto err;
        if (!read_lebn(&p, nbyte, &dsa->g))
                goto err;
        if (ispub) {
                if (!read_lebn(&p, nbyte, &dsa->pub_key))
                        goto err;
        } else {
                if (!read_lebn(&p, 20, &dsa->priv_key))
                        goto err;
                /* Calculate public key */
                if (!(dsa->pub_key = BN_new()))
                        goto err;
                if (!(ctx = BN_CTX_new()))
                        goto err;
                if (!BN_mod_exp_ct(dsa->pub_key, dsa->g,
                    dsa->priv_key, dsa->p, ctx))
                        goto err;
                BN_CTX_free(ctx);
        }

        EVP_PKEY_set1_DSA(ret, dsa);
        DSA_free(dsa);
        *in = p;
        return ret;

 err:
        PEMerror(ERR_R_MALLOC_FAILURE);
        DSA_free(dsa);
        EVP_PKEY_free(ret);
        BN_CTX_free(ctx);
        return NULL;
}

static EVP_PKEY *
b2i_rsa(const unsigned char **in, unsigned int length, unsigned int bitlen,
    int ispub)
{
        const unsigned char *p = *in;
        EVP_PKEY *ret = NULL;
        RSA *rsa = NULL;
        unsigned int nbyte, hnbyte;

        nbyte = (bitlen + 7) >> 3;
        hnbyte = (bitlen + 15) >> 4;
        rsa = RSA_new();
        ret = EVP_PKEY_new();
        if (!rsa || !ret)
                goto err;
        rsa->e = BN_new();
        if (!rsa->e)
                goto err;
        if (!BN_set_word(rsa->e, read_ledword(&p)))
                goto err;
        if (!read_lebn(&p, nbyte, &rsa->n))
                goto err;
        if (!ispub) {
                if (!read_lebn(&p, hnbyte, &rsa->p))
                        goto err;
                if (!read_lebn(&p, hnbyte, &rsa->q))
                        goto err;
                if (!read_lebn(&p, hnbyte, &rsa->dmp1))
                        goto err;
                if (!read_lebn(&p, hnbyte, &rsa->dmq1))
                        goto err;
                if (!read_lebn(&p, hnbyte, &rsa->iqmp))
                        goto err;
                if (!read_lebn(&p, nbyte, &rsa->d))
                        goto err;
        }

        EVP_PKEY_set1_RSA(ret, rsa);
        RSA_free(rsa);
        *in = p;
        return ret;

 err:
        PEMerror(ERR_R_MALLOC_FAILURE);
        RSA_free(rsa);
        EVP_PKEY_free(ret);
        return NULL;
}

EVP_PKEY *
b2i_PrivateKey(const unsigned char **in, long length)
{
        return do_b2i(in, length, 0);
}
LCRYPTO_ALIAS(b2i_PrivateKey);

EVP_PKEY *
b2i_PublicKey(const unsigned char **in, long length)
{
        return do_b2i(in, length, 1);
}
LCRYPTO_ALIAS(b2i_PublicKey);

EVP_PKEY *
b2i_PrivateKey_bio(BIO *in)
{
        return do_b2i_bio(in, 0);
}
LCRYPTO_ALIAS(b2i_PrivateKey_bio);

EVP_PKEY *
b2i_PublicKey_bio(BIO *in)
{
        return do_b2i_bio(in, 1);
}
LCRYPTO_ALIAS(b2i_PublicKey_bio);

static void
write_ledword(unsigned char **out, unsigned int dw)
{
        unsigned char *p = *out;

        *p++ = dw & 0xff;
        *p++ = (dw >> 8) & 0xff;
        *p++ = (dw >> 16) & 0xff;
        *p++ = (dw >> 24) & 0xff;
        *out = p;
}

static void
write_lebn(unsigned char **out, const BIGNUM *bn, int len)
{
        int nb, i;
        unsigned char *p = *out, *q, c;

        nb = BN_num_bytes(bn);
        BN_bn2bin(bn, p);
        q = p + nb - 1;
        /* In place byte order reversal */
        for (i = 0; i < nb / 2; i++) {
                c = *p;
                *p++ = *q;
                *q-- = c;
        }
        *out += nb;
        /* Pad with zeroes if we have to */
        if (len > 0) {
                len -= nb;
                if (len > 0) {
                        memset(*out, 0, len);
                        *out += len;
                }
        }
}


static int check_bitlen_rsa(RSA *rsa, int ispub, unsigned int *magic);
static int check_bitlen_dsa(DSA *dsa, int ispub, unsigned int *magic);

static void write_rsa(unsigned char **out, RSA *rsa, int ispub);
static void write_dsa(unsigned char **out, DSA *dsa, int ispub);

static int
do_i2b(unsigned char **out, EVP_PKEY *pk, int ispub)
{
        unsigned char *p;
        unsigned int bitlen, magic = 0, keyalg;
        int outlen, noinc = 0;

        if (pk->type == EVP_PKEY_DSA) {
                bitlen = check_bitlen_dsa(pk->pkey.dsa, ispub, &magic);
                keyalg = MS_KEYALG_DSS_SIGN;
        } else if (pk->type == EVP_PKEY_RSA) {
                bitlen = check_bitlen_rsa(pk->pkey.rsa, ispub, &magic);
                keyalg = MS_KEYALG_RSA_KEYX;
        } else
                return -1;
        if (bitlen == 0)
                return -1;
        outlen = 16 + blob_length(bitlen,
            keyalg == MS_KEYALG_DSS_SIGN ? 1 : 0, ispub);
        if (out == NULL)
                return outlen;
        if (*out)
                p = *out;
        else {
                p = malloc(outlen);
                if (!p)
                        return -1;
                *out = p;
                noinc = 1;
        }
        if (ispub)
                *p++ = MS_PUBLICKEYBLOB;
        else
                *p++ = MS_PRIVATEKEYBLOB;
        *p++ = 0x2;
        *p++ = 0;
        *p++ = 0;
        write_ledword(&p, keyalg);
        write_ledword(&p, magic);
        write_ledword(&p, bitlen);
        if (keyalg == MS_KEYALG_DSS_SIGN)
                write_dsa(&p, pk->pkey.dsa, ispub);
        else
                write_rsa(&p, pk->pkey.rsa, ispub);
        if (!noinc)
                *out += outlen;
        return outlen;
}

static int
do_i2b_bio(BIO *out, EVP_PKEY *pk, int ispub)
{
        unsigned char *tmp = NULL;
        int outlen, wrlen;

        outlen = do_i2b(&tmp, pk, ispub);
        if (outlen < 0)
                return -1;
        wrlen = BIO_write(out, tmp, outlen);
        free(tmp);
        if (wrlen == outlen)
                return outlen;
        return -1;
}

static int
check_bitlen_dsa(DSA *dsa, int ispub, unsigned int *pmagic)
{
        int bitlen;

        bitlen = BN_num_bits(dsa->p);
        if ((bitlen & 7) || (BN_num_bits(dsa->q) != 160) ||
            (BN_num_bits(dsa->g) > bitlen))
                goto err;
        if (ispub) {
                if (BN_num_bits(dsa->pub_key) > bitlen)
                        goto err;
                *pmagic = MS_DSS1MAGIC;
        } else {
                if (BN_num_bits(dsa->priv_key) > 160)
                        goto err;
                *pmagic = MS_DSS2MAGIC;
        }

        return bitlen;

 err:
        PEMerror(PEM_R_UNSUPPORTED_KEY_COMPONENTS);
        return 0;
}

static int
check_bitlen_rsa(RSA *rsa, int ispub, unsigned int *pmagic)
{
        int nbyte, hnbyte, bitlen;

        if (BN_num_bits(rsa->e) > 32)
                goto err;
        bitlen = BN_num_bits(rsa->n);
        nbyte = BN_num_bytes(rsa->n);
        hnbyte = (BN_num_bits(rsa->n) + 15) >> 4;
        if (ispub) {
                *pmagic = MS_RSA1MAGIC;
                return bitlen;
        } else {
                *pmagic = MS_RSA2MAGIC;
                /* For private key each component must fit within nbyte or
                 * hnbyte.
                 */
                if (BN_num_bytes(rsa->d) > nbyte)
                        goto err;
                if ((BN_num_bytes(rsa->iqmp) > hnbyte) ||
                    (BN_num_bytes(rsa->p) > hnbyte) ||
                    (BN_num_bytes(rsa->q) > hnbyte) ||
                    (BN_num_bytes(rsa->dmp1) > hnbyte) ||
                    (BN_num_bytes(rsa->dmq1) > hnbyte))
                        goto err;
        }
        return bitlen;

 err:
        PEMerror(PEM_R_UNSUPPORTED_KEY_COMPONENTS);
        return 0;
}

static void
write_rsa(unsigned char **out, RSA *rsa, int ispub)
{
        int nbyte, hnbyte;

        nbyte = BN_num_bytes(rsa->n);
        hnbyte = (BN_num_bits(rsa->n) + 15) >> 4;
        write_lebn(out, rsa->e, 4);
        write_lebn(out, rsa->n, -1);
        if (ispub)
                return;
        write_lebn(out, rsa->p, hnbyte);
        write_lebn(out, rsa->q, hnbyte);
        write_lebn(out, rsa->dmp1, hnbyte);
        write_lebn(out, rsa->dmq1, hnbyte);
        write_lebn(out, rsa->iqmp, hnbyte);
        write_lebn(out, rsa->d, nbyte);
}

static void
write_dsa(unsigned char **out, DSA *dsa, int ispub)
{
        int nbyte;

        nbyte = BN_num_bytes(dsa->p);
        write_lebn(out, dsa->p, nbyte);
        write_lebn(out, dsa->q, 20);
        write_lebn(out, dsa->g, nbyte);
        if (ispub)
                write_lebn(out, dsa->pub_key, nbyte);
        else
                write_lebn(out, dsa->priv_key, 20);
        /* Set "invalid" for seed structure values */
        memset(*out, 0xff, 24);
        *out += 24;
        return;
}

int
i2b_PrivateKey_bio(BIO *out, EVP_PKEY *pk)
{
        return do_i2b_bio(out, pk, 0);
}
LCRYPTO_ALIAS(i2b_PrivateKey_bio);

int
i2b_PublicKey_bio(BIO *out, EVP_PKEY *pk)
{
        return do_i2b_bio(out, pk, 1);
}
LCRYPTO_ALIAS(i2b_PublicKey_bio);

#ifndef OPENSSL_NO_RC4

static int
do_PVK_header(const unsigned char **in, unsigned int length, int skip_magic,
    unsigned int *psaltlen, unsigned int *pkeylen)
{
        const unsigned char *p = *in;
        unsigned int pvk_magic, is_encrypted;

        if (skip_magic) {
                if (length < 20) {
                        PEMerror(PEM_R_PVK_TOO_SHORT);
                        return 0;
                }
                length -= 20;
        } else {
                if (length < 24) {
                        PEMerror(PEM_R_PVK_TOO_SHORT);
                        return 0;
                }
                length -= 24;
                pvk_magic = read_ledword(&p);
                if (pvk_magic != MS_PVKMAGIC) {
                        PEMerror(PEM_R_BAD_MAGIC_NUMBER);
                        return 0;
                }
        }
        /* Skip reserved */
        p += 4;
        /*keytype = */read_ledword(&p);
        is_encrypted = read_ledword(&p);
        *psaltlen = read_ledword(&p);
        *pkeylen = read_ledword(&p);
        if (*psaltlen > 65536 || *pkeylen > 65536) {
                PEMerror(PEM_R_ERROR_CONVERTING_PRIVATE_KEY);
                return 0;
        }

        if (is_encrypted && !*psaltlen) {
                PEMerror(PEM_R_INCONSISTENT_HEADER);
                return 0;
        }

        *in = p;
        return 1;
}

static int
derive_pvk_key(unsigned char *key, const unsigned char *salt,
    unsigned int saltlen, const unsigned char *pass, int passlen)
{
        EVP_MD_CTX mctx;
        int rv = 1;

        EVP_MD_CTX_legacy_clear(&mctx);
        if (!EVP_DigestInit_ex(&mctx, EVP_sha1(), NULL) ||
            !EVP_DigestUpdate(&mctx, salt, saltlen) ||
            !EVP_DigestUpdate(&mctx, pass, passlen) ||
            !EVP_DigestFinal_ex(&mctx, key, NULL))
                rv = 0;

        EVP_MD_CTX_cleanup(&mctx);
        return rv;
}

static EVP_PKEY *
do_PVK_body(const unsigned char **in, unsigned int saltlen,
    unsigned int keylen, pem_password_cb *cb, void *u)
{
        EVP_PKEY *ret = NULL;
        const unsigned char *p = *in;
        unsigned int magic;
        unsigned char *enctmp = NULL, *q;
        EVP_CIPHER_CTX *cctx = NULL;

        if ((cctx = EVP_CIPHER_CTX_new()) == NULL) {
                PEMerror(ERR_R_MALLOC_FAILURE);
                goto err;
        }
        if (saltlen) {
                char psbuf[PEM_BUFSIZE];
                unsigned char keybuf[20];
                int enctmplen, inlen;

                if (cb)
                        inlen = cb(psbuf, PEM_BUFSIZE, 0, u);
                else
                        inlen = PEM_def_callback(psbuf, PEM_BUFSIZE, 0, u);
                if (inlen <= 0) {
                        PEMerror(PEM_R_BAD_PASSWORD_READ);
                        goto err;
                }
                enctmp = malloc(keylen + 8);
                if (!enctmp) {
                        PEMerror(ERR_R_MALLOC_FAILURE);
                        goto err;
                }
                if (!derive_pvk_key(keybuf, p, saltlen, (unsigned char *)psbuf,
                    inlen)) {
                        goto err;
                }
                p += saltlen;
                /* Copy BLOBHEADER across, decrypt rest */
                memcpy(enctmp, p, 8);
                p += 8;
                if (keylen < 8) {
                        PEMerror(PEM_R_PVK_TOO_SHORT);
                        goto err;
                }
                inlen = keylen - 8;
                q = enctmp + 8;
                if (!EVP_DecryptInit_ex(cctx, EVP_rc4(), NULL, keybuf, NULL))
                        goto err;
                if (!EVP_DecryptUpdate(cctx, q, &enctmplen, p, inlen))
                        goto err;
                if (!EVP_DecryptFinal_ex(cctx, q + enctmplen, &enctmplen))
                        goto err;
                magic = read_ledword((const unsigned char **)&q);
                if (magic != MS_RSA2MAGIC && magic != MS_DSS2MAGIC) {
                        q = enctmp + 8;
                        memset(keybuf + 5, 0, 11);
                        if (!EVP_DecryptInit_ex(cctx, EVP_rc4(), NULL, keybuf,
                            NULL))
                                goto err;
                        explicit_bzero(keybuf, 20);
                        if (!EVP_DecryptUpdate(cctx, q, &enctmplen, p, inlen))
                                goto err;
                        if (!EVP_DecryptFinal_ex(cctx, q + enctmplen,
                            &enctmplen))
                                goto err;
                        magic = read_ledword((const unsigned char **)&q);
                        if (magic != MS_RSA2MAGIC && magic != MS_DSS2MAGIC) {
                                PEMerror(PEM_R_BAD_DECRYPT);
                                goto err;
                        }
                } else
                        explicit_bzero(keybuf, 20);
                p = enctmp;
        }

        ret = b2i_PrivateKey(&p, keylen);

 err:
        EVP_CIPHER_CTX_free(cctx);
        free(enctmp);

        return ret;
}


EVP_PKEY *
b2i_PVK_bio(BIO *in, pem_password_cb *cb, void *u)
{
        unsigned char pvk_hdr[24], *buf = NULL;
        const unsigned char *p;
        size_t buflen;
        EVP_PKEY *ret = NULL;
        unsigned int saltlen, keylen;

        if (BIO_read(in, pvk_hdr, 24) != 24) {
                PEMerror(PEM_R_PVK_DATA_TOO_SHORT);
                return NULL;
        }
        p = pvk_hdr;

        if (!do_PVK_header(&p, 24, 0, &saltlen, &keylen))
                return 0;
        buflen = keylen + saltlen;
        buf = malloc(buflen);
        if (!buf) {
                PEMerror(ERR_R_MALLOC_FAILURE);
                return 0;
        }
        p = buf;
        if (BIO_read(in, buf, buflen) != buflen) {
                PEMerror(PEM_R_PVK_DATA_TOO_SHORT);
                goto err;
        }
        ret = do_PVK_body(&p, saltlen, keylen, cb, u);

 err:
        freezero(buf, buflen);
        return ret;
}
LCRYPTO_ALIAS(b2i_PVK_bio);

static int
i2b_PVK(unsigned char **out, EVP_PKEY*pk, int enclevel, pem_password_cb *cb,
    void *u)
{
        int outlen = 24, pklen;
        unsigned char *p = NULL, *start = NULL, *salt = NULL;
        EVP_CIPHER_CTX *cctx = NULL;

        if ((cctx = EVP_CIPHER_CTX_new()) == NULL) {
                PEMerror(ERR_R_MALLOC_FAILURE);
                goto err;
        }
        if (enclevel != 0)
                outlen += PVK_SALTLEN;
        pklen = do_i2b(NULL, pk, 0);
        if (pklen < 0)
                goto err;
        outlen += pklen;
        start = p = malloc(outlen);
        if (!p) {
                PEMerror(ERR_R_MALLOC_FAILURE);
                goto err;
        }

        write_ledword(&p, MS_PVKMAGIC);
        write_ledword(&p, 0);
        if (pk->type == EVP_PKEY_DSA)
                write_ledword(&p, MS_KEYTYPE_SIGN);
        else
                write_ledword(&p, MS_KEYTYPE_KEYX);
        write_ledword(&p, enclevel ? 1 : 0);
        write_ledword(&p, enclevel ? PVK_SALTLEN : 0);
        write_ledword(&p, pklen);
        if (enclevel != 0) {
                arc4random_buf(p, PVK_SALTLEN);
                salt = p;
                p += PVK_SALTLEN;
        }
        do_i2b(&p, pk, 0);
        if (enclevel != 0) {
                char psbuf[PEM_BUFSIZE];
                unsigned char keybuf[20];
                int enctmplen, inlen;
                if (cb)
                        inlen = cb(psbuf, PEM_BUFSIZE, 1, u);
                else
                        inlen = PEM_def_callback(psbuf, PEM_BUFSIZE, 1, u);
                if (inlen <= 0) {
                        PEMerror(PEM_R_BAD_PASSWORD_READ);
                        goto err;
                }
                if (!derive_pvk_key(keybuf, salt, PVK_SALTLEN,
                    (unsigned char *)psbuf, inlen))
                        goto err;
                if (enclevel == 1)
                        memset(keybuf + 5, 0, 11);
                p = salt + PVK_SALTLEN + 8;
                if (!EVP_EncryptInit_ex(cctx, EVP_rc4(), NULL, keybuf, NULL))
                        goto err;
                explicit_bzero(keybuf, 20);
                if (!EVP_EncryptUpdate(cctx, p, &enctmplen, p, pklen - 8))
                        goto err;
                if (!EVP_EncryptFinal_ex(cctx, p + enctmplen, &enctmplen))
                        goto err;
        }
        EVP_CIPHER_CTX_free(cctx);
        *out = start;
        return outlen;

 err:
        EVP_CIPHER_CTX_free(cctx);
        free(start);
        return -1;
}

int
i2b_PVK_bio(BIO *out, EVP_PKEY *pk, int enclevel, pem_password_cb *cb, void *u)
{
        unsigned char *tmp = NULL;
        int outlen, wrlen;

        outlen = i2b_PVK(&tmp, pk, enclevel, cb, u);
        if (outlen < 0)
                return -1;
        wrlen = BIO_write(out, tmp, outlen);
        free(tmp);
        if (wrlen != outlen) {
                PEMerror(PEM_R_BIO_WRITE_FAILURE);
                return -1;
        }
        return outlen;
}
LCRYPTO_ALIAS(i2b_PVK_bio);

#endif

#endif