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pvkfmt.c

/* 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 "cryptlib.h"
#include <openssl/pem.h>
#include <openssl/rand.h>
#include <openssl/bn.h>
#if !defined(OPENSSL_NO_RSA) && !defined(OPENSSL_NO_DSA)
#include <openssl/dsa.h>
#include <openssl/rsa.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 = OPENSSL_malloc(nbyte);
      if (!tmpbuf)
            return 0;
      q = tmpbuf;
      for (i = 0; i < nbyte; i++)
            *q++ = *p--;
      *r = BN_bin2bn(tmpbuf, nbyte, NULL);
      OPENSSL_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)
                  {
                  PEMerr(PEM_F_DO_BLOB_HEADER,
                              PEM_R_EXPECTING_PRIVATE_KEY_BLOB);
                  return 0;
                  }
            *pispub = 1;
            }
      else if (*p == MS_PRIVATEKEYBLOB)
            {
            if (*pispub == 1)
                  {
                  PEMerr(PEM_F_DO_BLOB_HEADER,
                              PEM_R_EXPECTING_PUBLIC_KEY_BLOB);
                  return 0;
                  }
            *pispub = 0;
            }
      else
            return 0;
      p++;
      /* Version */
      if (*p++ != 0x2)
            {
            PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_BAD_VERSION_NUMBER);
            return 0;
            }
      /* Ignore reserved, aiKeyAlg */
      p+= 6;
      *pmagic = read_ledword(&p);
      *pbitlen = read_ledword(&p);
      *pisdss = 0;
      switch (*pmagic)
            {

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

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

            default:
            PEMerr(PEM_F_DO_BLOB_HEADER, 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)
            {
            PEMerr(PEM_F_DO_B2I, PEM_R_KEYBLOB_HEADER_PARSE_ERROR);
            return NULL;
            }
      length -= 16;
      if (length < blob_length(bitlen, isdss, ispub))
            {
            PEMerr(PEM_F_DO_B2I, 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)
            {
            PEMerr(PEM_F_DO_B2I_BIO, 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 = OPENSSL_malloc(length);
      if (!buf)
            {
            PEMerr(PEM_F_DO_B2I_BIO, ERR_R_MALLOC_FAILURE);
            goto err;
            }
      p = buf;
      if (BIO_read(in, buf, length) != (int)length)
            {
            PEMerr(PEM_F_DO_B2I_BIO, 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:
      if (buf)
            OPENSSL_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 memerr;
      if (!read_lebn(&p, nbyte, &dsa->p))
            goto memerr;
      if (!read_lebn(&p, 20, &dsa->q))
            goto memerr;
      if (!read_lebn(&p, nbyte, &dsa->g))
            goto memerr;
      if (ispub)
            {
            if (!read_lebn(&p, nbyte, &dsa->pub_key))
                  goto memerr;
            }
      else
            {
            if (!read_lebn(&p, 20, &dsa->priv_key))
                  goto memerr;
            /* Calculate public key */
            if (!(dsa->pub_key = BN_new()))
                  goto memerr;
            if (!(ctx = BN_CTX_new()))
                  goto memerr;
                  
            if (!BN_mod_exp(dsa->pub_key, dsa->g,
                                     dsa->priv_key, dsa->p, ctx))
                  
                  goto memerr;
            BN_CTX_free(ctx);
            }

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

      memerr:
      PEMerr(PEM_F_B2I_DSS, ERR_R_MALLOC_FAILURE);
      if (dsa)
            DSA_free(dsa);
      if (ret)
            EVP_PKEY_free(ret);
      if (ctx)
            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 memerr;
      rsa->e = BN_new();
      if (!rsa->e)
            goto memerr;
      if (!BN_set_word(rsa->e, read_ledword(&p)))
            goto memerr;
      if (!read_lebn(&p, nbyte, &rsa->n))
            goto memerr;
      if (!ispub)
            {
            if (!read_lebn(&p, hnbyte, &rsa->p))
                  goto memerr;
            if (!read_lebn(&p, hnbyte, &rsa->q))
                  goto memerr;
            if (!read_lebn(&p, hnbyte, &rsa->dmp1))
                  goto memerr;
            if (!read_lebn(&p, hnbyte, &rsa->dmq1))
                  goto memerr;
            if (!read_lebn(&p, hnbyte, &rsa->iqmp))
                  goto memerr;
            if (!read_lebn(&p, nbyte, &rsa->d))
                  goto memerr;
            }

      EVP_PKEY_set1_RSA(ret, rsa);
      RSA_free(rsa);
      *in = p;
      return ret;
      memerr:
      PEMerr(PEM_F_B2I_RSA, ERR_R_MALLOC_FAILURE);
      if (rsa)
            RSA_free(rsa);
      if (ret)
            EVP_PKEY_free(ret);
      return NULL;
      }

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

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


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

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

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 = OPENSSL_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);
      OPENSSL_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 badkey;
      if (ispub)
            {
            if (BN_num_bits(dsa->pub_key) > bitlen)
                  goto badkey;
            *pmagic = MS_DSS1MAGIC;
            }
      else
            {
            if (BN_num_bits(dsa->priv_key) > 160)
                  goto badkey;
            *pmagic = MS_DSS2MAGIC;
            }
      
      return bitlen;
      badkey:
      PEMerr(PEM_F_CHECK_BITLEN_DSA, 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 badkey;
      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 badkey;
            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 badkey;
      }
      return bitlen;
      badkey:
      PEMerr(PEM_F_CHECK_BITLEN_RSA, 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);
      }

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

#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)
                  {
                  PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_PVK_TOO_SHORT);
                  return 0;
                  }
            length -= 20;
            }
      else
            {
            if (length < 24)
                  {
                  PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_PVK_TOO_SHORT);
                  return 0;
                  }
            length -= 24;
            pvk_magic = read_ledword(&p);
            if (pvk_magic != MS_PVKMAGIC)
                  {
                  PEMerr(PEM_F_DO_PVK_HEADER, 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 (is_encrypted && !*psaltlen)
            {
            PEMerr(PEM_F_DO_PVK_HEADER, 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;
      EVP_MD_CTX_init(&mctx);
      EVP_DigestInit_ex(&mctx, EVP_sha1(), NULL);
      EVP_DigestUpdate(&mctx, salt, saltlen);
      EVP_DigestUpdate(&mctx, pass, passlen);
      EVP_DigestFinal_ex(&mctx, key, NULL);
      EVP_MD_CTX_cleanup(&mctx);
      return 1;
      }
      

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;
      if (saltlen)
            {
            char psbuf[PEM_BUFSIZE];
            unsigned char keybuf[20];
            EVP_CIPHER_CTX cctx;
            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)
                  {
                  PEMerr(PEM_F_DO_PVK_BODY,PEM_R_BAD_PASSWORD_READ);
                  return NULL;
                  }
            enctmp = OPENSSL_malloc(keylen + 8);
            if (!enctmp)
                  {
                  PEMerr(PEM_F_DO_PVK_BODY, ERR_R_MALLOC_FAILURE);
                  return NULL;
                  }
            if (!derive_pvk_key(keybuf, p, saltlen,
                      (unsigned char *)psbuf, inlen))
                  return NULL;
            p += saltlen;
            /* Copy BLOBHEADER across, decrypt rest */
            memcpy(enctmp, p, 8);
            p += 8;
            inlen = keylen - 8;
            q = enctmp + 8;
            EVP_CIPHER_CTX_init(&cctx);
            EVP_DecryptInit_ex(&cctx, EVP_rc4(), NULL, keybuf, NULL);
            EVP_DecryptUpdate(&cctx, q, &enctmplen, p, inlen);
            EVP_DecryptFinal_ex(&cctx, q + enctmplen, &enctmplen);
            magic = read_ledword((const unsigned char **)&q);
            if (magic != MS_RSA2MAGIC && magic != MS_DSS2MAGIC)
                  {
                  q = enctmp + 8;
                  memset(keybuf + 5, 0, 11);
                  EVP_DecryptInit_ex(&cctx, EVP_rc4(), NULL, keybuf,
                                                NULL);
                  OPENSSL_cleanse(keybuf, 20);
                  EVP_DecryptUpdate(&cctx, q, &enctmplen, p, inlen);
                  EVP_DecryptFinal_ex(&cctx, q + enctmplen,
                                                &enctmplen);
                  magic = read_ledword((const unsigned char **)&q);
                  if (magic != MS_RSA2MAGIC && magic != MS_DSS2MAGIC)
                        {
                        EVP_CIPHER_CTX_cleanup(&cctx);
                        PEMerr(PEM_F_DO_PVK_BODY, PEM_R_BAD_DECRYPT);
                        goto err;
                        }
                  }
            else
                  OPENSSL_cleanse(keybuf, 20);
            EVP_CIPHER_CTX_cleanup(&cctx);
            p = enctmp;
            }

      ret = b2i_PrivateKey(&p, keylen);
      err:
      if (enctmp && saltlen)
            OPENSSL_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;
      int buflen;
      EVP_PKEY *ret = NULL;
      unsigned int saltlen, keylen;
      if (BIO_read(in, pvk_hdr, 24) != 24)
            {
            PEMerr(PEM_F_B2I_PVK_BIO, PEM_R_PVK_DATA_TOO_SHORT);
            return NULL;
            }
      p = pvk_hdr;

      if (!do_PVK_header(&p, 24, 0, &saltlen, &keylen))
            return 0;
      buflen = (int) keylen + saltlen;
      buf = OPENSSL_malloc(buflen);
      if (!buf)
            {
            PEMerr(PEM_F_B2I_PVK_BIO, ERR_R_MALLOC_FAILURE);
            return 0;
            }
      p = buf;
      if (BIO_read(in, buf, buflen) != buflen)
            {
            PEMerr(PEM_F_B2I_PVK_BIO, PEM_R_PVK_DATA_TOO_SHORT);
            goto err;
            }
      ret = do_PVK_body(&p, saltlen, keylen, cb, u);

      err:
      if (buf)
            {
            OPENSSL_cleanse(buf, buflen);
            OPENSSL_free(buf);
            }
      return ret;
      }

      
      
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, *salt = NULL;
      if (enclevel)
            outlen += PVK_SALTLEN;
      pklen = do_i2b(NULL, pk, 0);
      if (pklen < 0)
            return -1;
      outlen += pklen;
      if (!out)
            return outlen;
      if (*out)
            p = *out;
      else
            {
            p = OPENSSL_malloc(outlen);
            if (!p)
                  {
                  PEMerr(PEM_F_I2B_PVK,ERR_R_MALLOC_FAILURE);
                  return -1;
                  }
            *out = p;
            }

      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)
            {
            if (RAND_bytes(p, PVK_SALTLEN) <= 0)
                  goto error;
            salt = p;
            p += PVK_SALTLEN;
            }
      do_i2b(&p, pk, 0);
      if (enclevel == 0)
            return outlen;
      else
            {
            char psbuf[PEM_BUFSIZE];
            unsigned char keybuf[20];
            EVP_CIPHER_CTX cctx;
            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)
                  {
                  PEMerr(PEM_F_I2B_PVK,PEM_R_BAD_PASSWORD_READ);
                  goto error;
                  }
            if (!derive_pvk_key(keybuf, salt, PVK_SALTLEN,
                      (unsigned char *)psbuf, inlen))
                  goto error;
            if (enclevel == 1)
                  memset(keybuf + 5, 0, 11);
            p = salt + PVK_SALTLEN + 8;
            EVP_CIPHER_CTX_init(&cctx);
            EVP_EncryptInit_ex(&cctx, EVP_rc4(), NULL, keybuf, NULL);
            OPENSSL_cleanse(keybuf, 20);
            EVP_DecryptUpdate(&cctx, p, &enctmplen, p, pklen - 8);
            EVP_DecryptFinal_ex(&cctx, p + enctmplen, &enctmplen);
            EVP_CIPHER_CTX_cleanup(&cctx);
            }
      return outlen;

      error:
      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);
      OPENSSL_free(tmp);
      if (wrlen == outlen)
            {
            PEMerr(PEM_F_I2B_PVK_BIO, PEM_R_BIO_WRITE_FAILURE);
            return outlen;
            }
      return -1;
      }

#endif

#endif

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