/*

 * Copyright 1995-2020 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>

#include <openssl/engine.h>

#include <openssl/dh.h>

#include "crypto/asn1.h"

#include "crypto/evp.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_secmem(&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) {

            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) {

            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_secure_free(nm);

    OPENSSL_secure_clear_free(data, len);

    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)

{

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

        return PEM_write_bio_PKCS8PrivateKey(bp, x, enc,

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

    return PEM_write_bio_PrivateKey_traditional(bp, x, enc, kstr, klen, cb, u);

}

int PEM_write_bio_PrivateKey_traditional(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 == NULL || x->ameth->old_priv_encode == NULL) {

        PEMerr(PEM_F_PEM_WRITE_BIO_PRIVATEKEY_TRADITIONAL,

               PEM_R_UNSUPPORTED_PUBLIC_KEY_TYPE);

        return 0;

    }

    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 == NULL)

            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) {

            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_STDIO

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) == 0)

        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_STDIO

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