/* $OpenBSD: pem_pk8.c,v 1.13 2017/01/29 17:49:23 beck Exp $ */

/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

 * All rights reserved.

 *

 * This package is an SSL implementation written

 * by Eric Young (eay@cryptsoft.com).

 * The implementation was written so as to conform with Netscapes SSL.

 *

 * This library is free for commercial and non-commercial use as long as

 * the following conditions are aheared to.  The following conditions

 * apply to all code found in this distribution, be it the RC4, RSA,

 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation

 * included with this distribution is covered by the same copyright terms

 * except that the holder is Tim Hudson (tjh@cryptsoft.com).

 *

 * Copyright remains Eric Young's, and as such any Copyright notices in

 * the code are not to be removed.

 * If this package is used in a product, Eric Young should be given attribution

 * as the author of the parts of the library used.

 * This can be in the form of a textual message at program startup or

 * in documentation (online or textual) provided with the package.

 *

 * 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 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 acknowledgement:

 *    "This product includes cryptographic software written by

 *     Eric Young (eay@cryptsoft.com)"

 *    The word 'cryptographic' can be left out if the rouines from the library

 *    being used are not cryptographic related :-).

 * 4. If you include any Windows specific code (or a derivative thereof) from

 *    the apps directory (application code) you must include an acknowledgement:

 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

 *

 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND

 * ANY EXPRESS 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 AUTHOR OR 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.

 *

 * The licence and distribution terms for any publically available version or

 * derivative of this code cannot be changed.  i.e. this code cannot simply be

 * copied and put under another distribution licence

 * [including the GNU Public Licence.]

 */

#include <stdio.h>

#include <string.h>

#include <openssl/buffer.h>

#include <openssl/err.h>

#include <openssl/evp.h>

#include <openssl/objects.h>

#include <openssl/pem.h>

#include <openssl/pkcs12.h>

#include <openssl/x509.h>

static int do_pk8pkey(BIO *bp, EVP_PKEY *x, int isder, int nid,

    const EVP_CIPHER *enc, char *kstr, int klen, pem_password_cb *cb, void *u);

static int do_pk8pkey_fp(FILE *bp, EVP_PKEY *x, int isder, int nid,

    const EVP_CIPHER *enc, char *kstr, int klen, pem_password_cb *cb, void *u);

/* These functions write a private key in PKCS#8 format: it is a "drop in"

 * replacement for PEM_write_bio_PrivateKey() and friends. As usual if 'enc'

 * is NULL then it uses the unencrypted private key form. The 'nid' versions

 * uses PKCS#5 v1.5 PBE algorithms whereas the others use PKCS#5 v2.0.

 */

int

PEM_write_bio_PKCS8PrivateKey_nid(BIO *bp, EVP_PKEY *x, int nid, char *kstr,

    int klen, pem_password_cb *cb, void *u)

{

  return do_pk8pkey(bp, x, 0, nid, NULL, kstr, klen, cb, u);

}

int

PEM_write_bio_PKCS8PrivateKey(BIO *bp, EVP_PKEY *x, const EVP_CIPHER *enc,

    char *kstr, int klen, pem_password_cb *cb, void *u)

{

  return do_pk8pkey(bp, x, 0, -1, enc, kstr, klen, cb, u);

}

int

i2d_PKCS8PrivateKey_bio(BIO *bp, EVP_PKEY *x, const EVP_CIPHER *enc,

    char *kstr, int klen, pem_password_cb *cb, void *u)

{

  return do_pk8pkey(bp, x, 1, -1, enc, kstr, klen, cb, u);

}

int

i2d_PKCS8PrivateKey_nid_bio(BIO *bp, EVP_PKEY *x, int nid,

    char *kstr, int klen, pem_password_cb *cb, void *u)

{

  return do_pk8pkey(bp, x, 1, nid, NULL, kstr, klen, cb, u);

}

static int

do_pk8pkey(BIO *bp, EVP_PKEY *x, int isder, int nid, const EVP_CIPHER *enc,

    char *kstr, int klen, pem_password_cb *cb, void *u)

{

  X509_SIG *p8;

  PKCS8_PRIV_KEY_INFO *p8inf;

  char buf[PEM_BUFSIZE];

  int ret;

  if (!(p8inf = EVP_PKEY2PKCS8(x))) {

    PEMerror(PEM_R_ERROR_CONVERTING_PRIVATE_KEY);

    return 0;

  }

  if (enc || (nid != -1)) {

    if (!kstr) {

      if (!cb)

        klen = PEM_def_callback(buf, PEM_BUFSIZE, 1, u);

      else

        klen = cb(buf, PEM_BUFSIZE, 1, u);

      if (klen <= 0) {

        PEMerror(PEM_R_READ_KEY);

        PKCS8_PRIV_KEY_INFO_free(p8inf);

        return 0;

      }

      kstr = buf;

    }

    p8 = PKCS8_encrypt(nid, enc, kstr, klen, NULL, 0, 0, p8inf);

    if (kstr == buf)

      explicit_bzero(buf, klen);

    PKCS8_PRIV_KEY_INFO_free(p8inf);

    if (isder)

      ret = i2d_PKCS8_bio(bp, p8);

    else

      ret = PEM_write_bio_PKCS8(bp, p8);

    X509_SIG_free(p8);

    return ret;

  } else {

    if (isder)

      ret = i2d_PKCS8_PRIV_KEY_INFO_bio(bp, p8inf);

    else

      ret = PEM_write_bio_PKCS8_PRIV_KEY_INFO(bp, p8inf);

    PKCS8_PRIV_KEY_INFO_free(p8inf);

    return ret;

  }

}

EVP_PKEY *

d2i_PKCS8PrivateKey_bio(BIO *bp, EVP_PKEY **x, pem_password_cb *cb, void *u)

{

  PKCS8_PRIV_KEY_INFO *p8inf = NULL;

  X509_SIG *p8 = NULL;

  int klen;

  EVP_PKEY *ret;

  char psbuf[PEM_BUFSIZE];

  p8 = d2i_PKCS8_bio(bp, NULL);

  if (!p8)

    return NULL;

  if (cb)

    klen = cb(psbuf, PEM_BUFSIZE, 0, u);

  else

    klen = PEM_def_callback(psbuf, PEM_BUFSIZE, 0, u);

  if (klen <= 0) {

    PEMerror(PEM_R_BAD_PASSWORD_READ);

    X509_SIG_free(p8);

    return NULL;

  }

  p8inf = PKCS8_decrypt(p8, psbuf, klen);

  X509_SIG_free(p8);

  if (!p8inf)

    return NULL;

  ret = EVP_PKCS82PKEY(p8inf);

  PKCS8_PRIV_KEY_INFO_free(p8inf);

  if (!ret)

    return NULL;

  if (x) {

    EVP_PKEY_free(*x);

    *x = ret;

  }

  return ret;

}

int

i2d_PKCS8PrivateKey_fp(FILE *fp, EVP_PKEY *x, const EVP_CIPHER *enc,

    char *kstr, int klen, pem_password_cb *cb, void *u)

{

  return do_pk8pkey_fp(fp, x, 1, -1, enc, kstr, klen, cb, u);

}

int

i2d_PKCS8PrivateKey_nid_fp(FILE *fp, EVP_PKEY *x, int nid, char *kstr,

    int klen, pem_password_cb *cb, void *u)

{

  return do_pk8pkey_fp(fp, x, 1, nid, NULL, kstr, klen, cb, u);

}

int

PEM_write_PKCS8PrivateKey_nid(FILE *fp, EVP_PKEY *x, int nid, char *kstr,

    int klen, pem_password_cb *cb, void *u)

{

  return do_pk8pkey_fp(fp, x, 0, nid, NULL, kstr, klen, cb, u);

}

int

PEM_write_PKCS8PrivateKey(FILE *fp, EVP_PKEY *x, const EVP_CIPHER *enc,

    char *kstr, int klen, pem_password_cb *cb, void *u)

{

  return do_pk8pkey_fp(fp, x, 0, -1, enc, kstr, klen, cb, u);

}

static int

do_pk8pkey_fp(FILE *fp, EVP_PKEY *x, int isder, int nid, const EVP_CIPHER *enc,

    char *kstr, int klen, pem_password_cb *cb, void *u)

{

  BIO *bp;

  int ret;

  if (!(bp = BIO_new_fp(fp, BIO_NOCLOSE))) {

    PEMerror(ERR_R_BUF_LIB);

    return (0);

  }

  ret = do_pk8pkey(bp, x, isder, nid, enc, kstr, klen, cb, u);

  BIO_free(bp);

  return ret;

}

EVP_PKEY *

d2i_PKCS8PrivateKey_fp(FILE *fp, EVP_PKEY **x, pem_password_cb *cb, void *u)

{

  BIO *bp;

  EVP_PKEY *ret;

  if (!(bp = BIO_new_fp(fp, BIO_NOCLOSE))) {

    PEMerror(ERR_R_BUF_LIB);

    return NULL;

  }

  ret = d2i_PKCS8PrivateKey_bio(bp, x, cb, u);

  BIO_free(bp);

  return ret;

}

X509_SIG *

PEM_read_PKCS8(FILE *fp, X509_SIG **x, pem_password_cb *cb, void *u)

{

  return PEM_ASN1_read((d2i_of_void *)d2i_X509_SIG, PEM_STRING_PKCS8, fp,

      (void **)x, cb, u);

}

int

PEM_write_PKCS8(FILE *fp, X509_SIG *x)

{

  return PEM_ASN1_write((i2d_of_void *)i2d_X509_SIG, PEM_STRING_PKCS8, fp,

      x, NULL, NULL, 0, NULL, NULL);

}

X509_SIG *

PEM_read_bio_PKCS8(BIO *bp, X509_SIG **x, pem_password_cb *cb, void *u)

{

  return PEM_ASN1_read_bio((d2i_of_void *)d2i_X509_SIG, PEM_STRING_PKCS8, bp,

      (void **)x, cb, u);

}

int

PEM_write_bio_PKCS8(BIO *bp, X509_SIG *x)

{

  return PEM_ASN1_write_bio((i2d_of_void *)i2d_X509_SIG, PEM_STRING_PKCS8, bp,

      x, NULL, NULL, 0, NULL, NULL);

}

PKCS8_PRIV_KEY_INFO *

PEM_read_PKCS8_PRIV_KEY_INFO(FILE *fp, PKCS8_PRIV_KEY_INFO **x, pem_password_cb *cb, void *u)

{

  return PEM_ASN1_read((d2i_of_void *)d2i_PKCS8_PRIV_KEY_INFO, PEM_STRING_PKCS8INF, fp,

      (void **)x, cb, u);

}

int

PEM_write_PKCS8_PRIV_KEY_INFO(FILE *fp, PKCS8_PRIV_KEY_INFO *x)

{

  return PEM_ASN1_write((i2d_of_void *)i2d_PKCS8_PRIV_KEY_INFO, PEM_STRING_PKCS8INF, fp,

      x, NULL, NULL, 0, NULL, NULL);

}

PKCS8_PRIV_KEY_INFO *

PEM_read_bio_PKCS8_PRIV_KEY_INFO(BIO *bp, PKCS8_PRIV_KEY_INFO **x, pem_password_cb *cb, void *u)

{

  return PEM_ASN1_read_bio((d2i_of_void *)d2i_PKCS8_PRIV_KEY_INFO, PEM_STRING_PKCS8INF, bp,

      (void **)x, cb, u);

}

int

PEM_write_bio_PKCS8_PRIV_KEY_INFO(BIO *bp, PKCS8_PRIV_KEY_INFO *x)

{

  return PEM_ASN1_write_bio((i2d_of_void *)i2d_PKCS8_PRIV_KEY_INFO, PEM_STRING_PKCS8INF, bp,

      x, NULL, NULL, 0, NULL, NULL);

}