/* crypto/pem/pem_pkey.c */

/* 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 "cryptlib.h"

#include <openssl/buffer.h>

#include <openssl/objects.h>

#include <openssl/evp.h>

#include <openssl/rand.h>

#include <openssl/x509.h>

#include <openssl/pkcs12.h>

#include <openssl/pem.h>

#ifndef OPENSSL_NO_ENGINE

# include <openssl/engine.h>

#endif

#ifndef OPENSSL_NO_DH

# include <openssl/dh.h>

#endif

#include "asn1_locl.h"

int pem_check_suffix(const char *pem_str, const char *suffix);

EVP_PKEY *PEM_read_bio_PrivateKey(BIO *bp, EVP_PKEY **x, pem_password_cb *cb,

                                  void *u)

{

    char *nm = NULL;

    const unsigned char *p = NULL;

    unsigned char *data = NULL;

    long len;

    int slen;

    EVP_PKEY *ret = NULL;

    if (!PEM_bytes_read_bio(&data, &len, &nm, PEM_STRING_EVP_PKEY, bp, cb, u))

        return NULL;

    p = data;

    if (strcmp(nm, PEM_STRING_PKCS8INF) == 0) {

        PKCS8_PRIV_KEY_INFO *p8inf;

        p8inf = d2i_PKCS8_PRIV_KEY_INFO(NULL, &p, len);

        if (!p8inf)

            goto p8err;

        ret = EVP_PKCS82PKEY(p8inf);

        if (x) {

            if (*x)

                EVP_PKEY_free((EVP_PKEY *)*x);

            *x = ret;

        }

        PKCS8_PRIV_KEY_INFO_free(p8inf);

    } else if (strcmp(nm, PEM_STRING_PKCS8) == 0) {

        PKCS8_PRIV_KEY_INFO *p8inf;

        X509_SIG *p8;

        int klen;

        char psbuf[PEM_BUFSIZE];

        p8 = d2i_X509_SIG(NULL, &p, len);

        if (!p8)

            goto p8err;

        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_PEM_READ_BIO_PRIVATEKEY, PEM_R_BAD_PASSWORD_READ);

            X509_SIG_free(p8);

            goto err;

        }

        p8inf = PKCS8_decrypt(p8, psbuf, klen);

        X509_SIG_free(p8);

        OPENSSL_cleanse(psbuf, klen);

        if (!p8inf)

            goto p8err;

        ret = EVP_PKCS82PKEY(p8inf);

        if (x) {

            if (*x)

                EVP_PKEY_free((EVP_PKEY *)*x);

            *x = ret;

        }

        PKCS8_PRIV_KEY_INFO_free(p8inf);

    } else if ((slen = pem_check_suffix(nm, "PRIVATE KEY")) > 0) {

        const EVP_PKEY_ASN1_METHOD *ameth;

        ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen);

        if (!ameth || !ameth->old_priv_decode)

            goto p8err;

        ret = d2i_PrivateKey(ameth->pkey_id, x, &p, len);

    }

 p8err:

    if (ret == NULL)

        PEMerr(PEM_F_PEM_READ_BIO_PRIVATEKEY, ERR_R_ASN1_LIB);

 err:

    OPENSSL_free(nm);

    OPENSSL_cleanse(data, len);

    OPENSSL_free(data);

    return (ret);

}

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

                             unsigned char *kstr, int klen,

                             pem_password_cb *cb, void *u)

{

    char pem_str[80];

    if (!x->ameth || x->ameth->priv_encode)

        return PEM_write_bio_PKCS8PrivateKey(bp, x, enc,

                                             (char *)kstr, klen, cb, u);

    BIO_snprintf(pem_str, 80, "%s PRIVATE KEY", x->ameth->pem_str);

    return PEM_ASN1_write_bio((i2d_of_void *)i2d_PrivateKey,

                              pem_str, bp, x, enc, kstr, klen, cb, u);

}

EVP_PKEY *PEM_read_bio_Parameters(BIO *bp, EVP_PKEY **x)

{

    char *nm = NULL;

    const unsigned char *p = NULL;

    unsigned char *data = NULL;

    long len;

    int slen;

    EVP_PKEY *ret = NULL;

    if (!PEM_bytes_read_bio(&data, &len, &nm, PEM_STRING_PARAMETERS,

                            bp, 0, NULL))

        return NULL;

    p = data;

    if ((slen = pem_check_suffix(nm, "PARAMETERS")) > 0) {

        ret = EVP_PKEY_new();

        if (!ret)

            goto err;

        if (!EVP_PKEY_set_type_str(ret, nm, slen)

            || !ret->ameth->param_decode

            || !ret->ameth->param_decode(ret, &p, len)) {

            EVP_PKEY_free(ret);

            ret = NULL;

            goto err;

        }

        if (x) {

            if (*x)

                EVP_PKEY_free((EVP_PKEY *)*x);

            *x = ret;

        }

    }

 err:

    if (ret == NULL)

        PEMerr(PEM_F_PEM_READ_BIO_PARAMETERS, ERR_R_ASN1_LIB);

    OPENSSL_free(nm);

    OPENSSL_free(data);

    return (ret);

}

int PEM_write_bio_Parameters(BIO *bp, EVP_PKEY *x)

{

    char pem_str[80];

    if (!x->ameth || !x->ameth->param_encode)

        return 0;

    BIO_snprintf(pem_str, 80, "%s PARAMETERS", x->ameth->pem_str);

    return PEM_ASN1_write_bio((i2d_of_void *)x->ameth->param_encode,

                              pem_str, bp, x, NULL, NULL, 0, 0, NULL);

}

#ifndef OPENSSL_NO_FP_API

EVP_PKEY *PEM_read_PrivateKey(FILE *fp, EVP_PKEY **x, pem_password_cb *cb,

                              void *u)

{

    BIO *b;

    EVP_PKEY *ret;

    if ((b = BIO_new(BIO_s_file())) == NULL) {

        PEMerr(PEM_F_PEM_READ_PRIVATEKEY, ERR_R_BUF_LIB);

        return (0);

    }

    BIO_set_fp(b, fp, BIO_NOCLOSE);

    ret = PEM_read_bio_PrivateKey(b, x, cb, u);

    BIO_free(b);

    return (ret);

}

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

                         unsigned char *kstr, int klen,

                         pem_password_cb *cb, void *u)

{

    BIO *b;

    int ret;

    if ((b = BIO_new_fp(fp, BIO_NOCLOSE)) == NULL) {

        PEMerr(PEM_F_PEM_WRITE_PRIVATEKEY, ERR_R_BUF_LIB);

        return 0;

    }

    ret = PEM_write_bio_PrivateKey(b, x, enc, kstr, klen, cb, u);

    BIO_free(b);

    return ret;

}

#endif

#ifndef OPENSSL_NO_DH

/* Transparently read in PKCS#3 or X9.42 DH parameters */

DH *PEM_read_bio_DHparams(BIO *bp, DH **x, pem_password_cb *cb, void *u)

{

    char *nm = NULL;

    const unsigned char *p = NULL;

    unsigned char *data = NULL;

    long len;

    DH *ret = NULL;

    if (!PEM_bytes_read_bio(&data, &len, &nm, PEM_STRING_DHPARAMS, bp, cb, u))

        return NULL;

    p = data;

    if (!strcmp(nm, PEM_STRING_DHXPARAMS))

        ret = d2i_DHxparams(x, &p, len);

    else

        ret = d2i_DHparams(x, &p, len);

    if (ret == NULL)

        PEMerr(PEM_F_PEM_READ_BIO_DHPARAMS, ERR_R_ASN1_LIB);

    OPENSSL_free(nm);

    OPENSSL_free(data);

    return ret;

}

# ifndef OPENSSL_NO_FP_API

DH *PEM_read_DHparams(FILE *fp, DH **x, pem_password_cb *cb, void *u)

{

    BIO *b;

    DH *ret;

    if ((b = BIO_new(BIO_s_file())) == NULL) {

        PEMerr(PEM_F_PEM_READ_DHPARAMS, ERR_R_BUF_LIB);

        return (0);

    }

    BIO_set_fp(b, fp, BIO_NOCLOSE);

    ret = PEM_read_bio_DHparams(b, x, cb, u);

    BIO_free(b);

    return (ret);

}

# endif

#endif