// Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

//     https://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

#include <openssl/pem.h>

#include <openssl/err.h>

#include <openssl/evp.h>

#include <openssl/mem.h>

#include <openssl/obj.h>

#include <openssl/pkcs8.h>

#include <openssl/rand.h>

#include <openssl/x509.h>

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

                      const EVP_CIPHER *enc, const char *pass, int pass_len,

                      pem_password_cb *cb, void *u);

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

                         const EVP_CIPHER *enc, const char *pass, int pass_len,

                         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, const EVP_PKEY *x, int nid,

                                      const char *pass, int pass_len,

                                      pem_password_cb *cb, void *u) {

  return do_pk8pkey(bp, x, 0, nid, NULL, pass, pass_len, cb, u);

}

int PEM_write_bio_PKCS8PrivateKey(BIO *bp, const EVP_PKEY *x,

                                  const EVP_CIPHER *enc, const char *pass,

                                  int pass_len, pem_password_cb *cb, void *u) {

  return do_pk8pkey(bp, x, 0, -1, enc, pass, pass_len, cb, u);

}

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

                            const char *pass, int pass_len, pem_password_cb *cb,

                            void *u) {

  return do_pk8pkey(bp, x, 1, -1, enc, pass, pass_len, cb, u);

}

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

                                const char *pass, int pass_len,

                                pem_password_cb *cb, void *u) {

  return do_pk8pkey(bp, x, 1, nid, NULL, pass, pass_len, cb, u);

}

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

                      const EVP_CIPHER *enc, const char *pass, int pass_len,

                      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))) {

    OPENSSL_PUT_ERROR(PEM, PEM_R_ERROR_CONVERTING_PRIVATE_KEY);

    return 0;

  }

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

    if (!pass) {

      if (!cb) {

        cb = PEM_def_callback;

      }

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

      if (pass_len < 0) {

        OPENSSL_PUT_ERROR(PEM, PEM_R_READ_KEY);

        PKCS8_PRIV_KEY_INFO_free(p8inf);

        return 0;

      }

      pass = buf;

    }

    p8 = PKCS8_encrypt(nid, enc, pass, pass_len, NULL, 0, 0, p8inf);

    if (pass == buf) {

      OPENSSL_cleanse(buf, pass_len);

    }

    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 pass_len;

  EVP_PKEY *ret;

  char psbuf[PEM_BUFSIZE];

  p8 = d2i_PKCS8_bio(bp, NULL);

  if (!p8) {

    return NULL;

  }

  pass_len = 0;

  if (!cb) {

    cb = PEM_def_callback;

  }

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

  if (pass_len < 0) {

    OPENSSL_PUT_ERROR(PEM, PEM_R_BAD_PASSWORD_READ);

    X509_SIG_free(p8);

    return NULL;

  }

  p8inf = PKCS8_decrypt(p8, psbuf, pass_len);

  X509_SIG_free(p8);

  OPENSSL_cleanse(psbuf, pass_len);

  if (!p8inf) {

    return NULL;

  }

  ret = EVP_PKCS82PKEY(p8inf);

  PKCS8_PRIV_KEY_INFO_free(p8inf);

  if (!ret) {

    return NULL;

  }

  if (x) {

    if (*x) {

      EVP_PKEY_free(*x);

    }

    *x = ret;

  }

  return ret;

}

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

                           const char *pass, int pass_len, pem_password_cb *cb,

                           void *u) {

  return do_pk8pkey_fp(fp, x, 1, -1, enc, pass, pass_len, cb, u);

}

int i2d_PKCS8PrivateKey_nid_fp(FILE *fp, const EVP_PKEY *x, int nid,

                               const char *pass, int pass_len,

                               pem_password_cb *cb, void *u) {

  return do_pk8pkey_fp(fp, x, 1, nid, NULL, pass, pass_len, cb, u);

}

int PEM_write_PKCS8PrivateKey_nid(FILE *fp, const EVP_PKEY *x, int nid,

                                  const char *pass, int pass_len,

                                  pem_password_cb *cb, void *u) {

  return do_pk8pkey_fp(fp, x, 0, nid, NULL, pass, pass_len, cb, u);

}

int PEM_write_PKCS8PrivateKey(FILE *fp, const EVP_PKEY *x,

                              const EVP_CIPHER *enc, const char *pass,

                              int pass_len, pem_password_cb *cb, void *u) {

  return do_pk8pkey_fp(fp, x, 0, -1, enc, pass, pass_len, cb, u);

}

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

                         const EVP_CIPHER *enc, const char *pass, int pass_len,

                         pem_password_cb *cb, void *u) {

  BIO *bp;

  int ret;

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

    OPENSSL_PUT_ERROR(PEM, ERR_R_BUF_LIB);

    return 0;

  }

  ret = do_pk8pkey(bp, x, isder, nid, enc, pass, pass_len, 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))) {

    OPENSSL_PUT_ERROR(PEM, ERR_R_BUF_LIB);

    return NULL;

  }

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

  BIO_free(bp);

  return ret;

}

IMPLEMENT_PEM_rw(PKCS8, X509_SIG, PEM_STRING_PKCS8, X509_SIG)

IMPLEMENT_PEM_rw(PKCS8_PRIV_KEY_INFO, PKCS8_PRIV_KEY_INFO, PEM_STRING_PKCS8INF,

                 PKCS8_PRIV_KEY_INFO)