/*

 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include <stdio.h>

#include "internal/cryptlib.h"

#include <openssl/buffer.h>

#include <openssl/objects.h>

#include <openssl/evp.h>

#include <openssl/x509.h>

#include <openssl/pkcs12.h>

#include <openssl/pem.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);

#ifndef OPENSSL_NO_STDIO

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);

#endif

/*

 * 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)) == NULL) {

        PEMerr(PEM_F_DO_PK8PKEY, 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) {

                PEMerr(PEM_F_DO_PK8PKEY, 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)

            OPENSSL_cleanse(buf, klen);

        PKCS8_PRIV_KEY_INFO_free(p8inf);

        if (p8 == NULL)

            return 0;

        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) {

        PEMerr(PEM_F_D2I_PKCS8PRIVATEKEY_BIO, PEM_R_BAD_PASSWORD_READ);

        X509_SIG_free(p8);

        return NULL;

    }

    p8inf = PKCS8_decrypt(p8, psbuf, klen);

    X509_SIG_free(p8);

    OPENSSL_cleanse(psbuf, klen);

    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;

}

#ifndef OPENSSL_NO_STDIO

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)) == NULL) {

        PEMerr(PEM_F_DO_PK8PKEY_FP, 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)) == NULL) {

        PEMerr(PEM_F_D2I_PKCS8PRIVATEKEY_FP, ERR_R_BUF_LIB);

        return NULL;

    }

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

    BIO_free(bp);

    return ret;

}

#endif

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)