/*

 * Copyright 1995-2022 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the Apache License 2.0 (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/core_dispatch.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/encoder.h>

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

                      int nid, const EVP_CIPHER *enc,

                      const char *kstr, int klen,

                      pem_password_cb *cb, void *u,

                      const char *propq);

#ifndef OPENSSL_NO_STDIO

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

                         int nid, const EVP_CIPHER *enc,

                         const char *kstr, int klen,

                         pem_password_cb *cb, void *u,

                         const char *propq);

#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, const EVP_PKEY *x, int nid,

                                      const char *kstr, int klen,

                                      pem_password_cb *cb, void *u)

{

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

}

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

                                  const char *kstr, int klen,

                                  pem_password_cb *cb, void *u)

{

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

}

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

                            const char *kstr, int klen,

                            pem_password_cb *cb, void *u)

{

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

}

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

                                const char *kstr, int klen,

                                pem_password_cb *cb, void *u)

{

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

}

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

                      const EVP_CIPHER *enc, const char *kstr, int klen,

                      pem_password_cb *cb, void *u, const char *propq)

{

    int ret = 0;

    const char *outtype = isder ? "DER" : "PEM";

    OSSL_ENCODER_CTX *ctx =

        OSSL_ENCODER_CTX_new_for_pkey(x, OSSL_KEYMGMT_SELECT_ALL,

                                      outtype, "PrivateKeyInfo", propq);

    if (ctx == NULL)

        return 0;

    /*

     * If no keystring or callback is set, OpenSSL traditionally uses the

     * user's cb argument as a password string, or if that's NULL, it falls

     * back on PEM_def_callback().

     */

    if (kstr == NULL && cb == NULL) {

        if (u != NULL) {

            kstr = u;

            klen = strlen(u);

        } else {

            cb = PEM_def_callback;

        }

    }

    /*

     * NOTE: There is no attempt to do a EVP_CIPHER_fetch() using the nid,

     * since the nid is a PBE algorithm which can't be fetched currently.

     * (e.g. NID_pbe_WithSHA1And2_Key_TripleDES_CBC). Just use the legacy

     * path if the NID is passed.

     */

    if (nid == -1 && OSSL_ENCODER_CTX_get_num_encoders(ctx) != 0) {

        ret = 1;

        if (enc != NULL) {

            ret = 0;

            if (OSSL_ENCODER_CTX_set_cipher(ctx, EVP_CIPHER_get0_name(enc),

                                            NULL)) {

                const unsigned char *ukstr = (const unsigned char *)kstr;

                /*

                 * Try to pass the passphrase if one was given, or the

                 * passphrase callback if one was given.  If none of them

                 * are given and that's wrong, we rely on the _to_bio()

                 * call to generate errors.

                 */

                ret = 1;

                if (kstr != NULL

                    && !OSSL_ENCODER_CTX_set_passphrase(ctx, ukstr, klen))

                    ret = 0;

                else if (cb != NULL

                         && !OSSL_ENCODER_CTX_set_pem_password_cb(ctx, cb, u))

                    ret = 0;

            }

        }

        ret = ret && OSSL_ENCODER_to_bio(ctx, bp);

    } else {

        X509_SIG *p8;

        PKCS8_PRIV_KEY_INFO *p8inf;

        char buf[PEM_BUFSIZE];

        ret = 0;

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

            ERR_raise(ERR_LIB_PEM, PEM_R_ERROR_CONVERTING_PRIVATE_KEY);

            goto legacy_end;

        }

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

            if (kstr == NULL) {

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

                if (klen < 0) {

                    ERR_raise(ERR_LIB_PEM, PEM_R_READ_KEY);

                    goto legacy_end;

                }

                kstr = buf;

            }

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

            if (kstr == buf)

                OPENSSL_cleanse(buf, klen);

            if (p8 == NULL)

                goto legacy_end;

            if (isder)

                ret = i2d_PKCS8_bio(bp, p8);

            else

                ret = PEM_write_bio_PKCS8(bp, p8);

            X509_SIG_free(p8);

        } else {

            if (isder)

                ret = i2d_PKCS8_PRIV_KEY_INFO_bio(bp, p8inf);

            else

                ret = PEM_write_bio_PKCS8_PRIV_KEY_INFO(bp, p8inf);

        }

     legacy_end:

        PKCS8_PRIV_KEY_INFO_free(p8inf);

    }

    OSSL_ENCODER_CTX_free(ctx);

    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 + 1]; /* reserve one byte at the end */

    p8 = d2i_PKCS8_bio(bp, NULL);

    if (p8 == NULL)

        return NULL;

    if (cb != NULL)

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

    else

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

    if (klen < 0 || klen > PEM_BUFSIZE) {

        ERR_raise(ERR_LIB_PEM, 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 == NULL)

        return NULL;

    ret = EVP_PKCS82PKEY(p8inf);

    PKCS8_PRIV_KEY_INFO_free(p8inf);

    if (!ret)

        return NULL;

    if (x != NULL) {

        EVP_PKEY_free(*x);

        *x = ret;

    }

    return ret;

}

#ifndef OPENSSL_NO_STDIO

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

                           const char *kstr, int klen,

                           pem_password_cb *cb, void *u)

{

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

}

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

                               const char *kstr, int klen,

                               pem_password_cb *cb, void *u)

{

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

}

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

                                  const char *kstr, int klen,

                                  pem_password_cb *cb, void *u)

{

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

}

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

                              const char *kstr, int klen,

                              pem_password_cb *cb, void *u)

{

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

}

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

                         const EVP_CIPHER *enc, const char *kstr, int klen,

                         pem_password_cb *cb, void *u, const char *propq)

{

    BIO *bp;

    int ret;

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

        ERR_raise(ERR_LIB_PEM, ERR_R_BUF_LIB);

        return 0;

    }

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

    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) {

        ERR_raise(ERR_LIB_PEM, 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)