crypto/asn1/i2d_pr.c

   1 /*
   2  * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include "internal/cryptlib.h"
  12 #include <openssl/evp.h>
  13 #include <openssl/encoder.h>
  14 #include <openssl/buffer.h>
  15 #include <openssl/x509.h>
  16 #include "crypto/asn1.h"
  17 #include "crypto/evp.h"
  18
  19 int i2d_PrivateKey(const EVP_PKEY *a, unsigned char **pp)
  20 {
  21     if (a->ameth && a->ameth->old_priv_encode) {
  22         return a->ameth->old_priv_encode(a, pp);
  23     }
  24     if (a->ameth && a->ameth->priv_encode) {
  25         PKCS8_PRIV_KEY_INFO *p8 = EVP_PKEY2PKCS8(a);
  26         int ret = 0;
  27         if (p8 != NULL) {
  28             ret = i2d_PKCS8_PRIV_KEY_INFO(p8, pp);
  29             PKCS8_PRIV_KEY_INFO_free(p8);
  30         }
  31         return ret;
  32     }
  33     if (a->keymgmt != NULL) {
  34         /* The private key includes everything */
  35         int selection =
  36             OSSL_KEYMGMT_SELECT_ALL_PARAMETERS | OSSL_KEYMGMT_SELECT_KEYPAIR;
  37         OSSL_ENCODER_CTX *ctx =
  38             OSSL_ENCODER_CTX_new_by_EVP_PKEY(a, "DER", selection, NULL, NULL);
  39         BIO *out = BIO_new(BIO_s_mem());
  40         BUF_MEM *buf = NULL;
  41         int ret = -1;
  42
  43         if (ctx != NULL
  44             && out != NULL
  45             && OSSL_ENCODER_CTX_get_num_encoders(ctx) != 0
  46             && OSSL_ENCODER_to_bio(ctx, out)
  47             && BIO_get_mem_ptr(out, &buf) > 0) {
  48             ret = buf->length;
  49
  50             if (pp != NULL) {
  51                 if (*pp == NULL) {
  52                     *pp = (unsigned char *)buf->data;
  53                     buf->length = 0;
  54                     buf->data = NULL;
  55                 } else {
  56                     memcpy(*pp, buf->data, ret);
  57                     *pp += ret;
  58                 }
  59             }
  60         }
  61         BIO_free(out);
  62         OSSL_ENCODER_CTX_free(ctx);
  63         return ret;
  64     }
  65     ASN1err(ASN1_F_I2D_PRIVATEKEY, ASN1_R_UNSUPPORTED_PUBLIC_KEY_TYPE);
  66     return -1;
  67 }