text: /* 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 <openssl/evp.h>
  
  #include <openssl/asn1.h>
  #include <openssl/err.h>
  #include <openssl/obj.h>
  #include <openssl/x509.h>
  
  #include "internal.h"
  
  
  EVP_PKEY *d2i_PrivateKey(int type, EVP_PKEY **out, const uint8_t **inp,
                           long len) {
    EVP_PKEY *ret;
  
    if (out == NULL || *out == NULL) {
      ret = EVP_PKEY_new();
      if (ret == NULL) {
        OPENSSL_PUT_ERROR(EVP, ERR_R_EVP_LIB);
        return NULL;
      }
    } else {
      ret = *out;
    }
  
    if (!EVP_PKEY_set_type(ret, type)) {
      OPENSSL_PUT_ERROR(EVP, EVP_R_UNKNOWN_PUBLIC_KEY_TYPE);
      goto err;
    }
  
    if (!ret->ameth->old_priv_decode ||
        !ret->ameth->old_priv_decode(ret, inp, len)) {
      if (ret->ameth->priv_decode) {
        PKCS8_PRIV_KEY_INFO *p8 = d2i_PKCS8_PRIV_KEY_INFO(NULL, inp, len);
        if (!p8) {
          goto err;
        }
        EVP_PKEY_free(ret);
        ret = EVP_PKCS82PKEY(p8);
        PKCS8_PRIV_KEY_INFO_free(p8);
      } else {
        OPENSSL_PUT_ERROR(EVP, ERR_R_ASN1_LIB);
        goto err;
      }
    }
  
    if (out != NULL) {
      *out = ret;
    }
    return ret;
  
  err:
    if (out == NULL || *out != ret) {
      EVP_PKEY_free(ret);
    }
    return NULL;
  }
  
  EVP_PKEY *d2i_AutoPrivateKey(EVP_PKEY **out, const uint8_t **inp, long len) {
    STACK_OF(ASN1_TYPE) *inkey;
    const uint8_t *p;
    int keytype;
    p = *inp;
  
    /* Dirty trick: read in the ASN1 data into out STACK_OF(ASN1_TYPE):
     * by analyzing it we can determine the passed structure: this
     * assumes the input is surrounded by an ASN1 SEQUENCE. */
    inkey = d2i_ASN1_SEQUENCE_ANY(NULL, &p, len);
    /* Since we only need to discern "traditional format" RSA and DSA
     * keys we can just count the elements. */
    if (sk_ASN1_TYPE_num(inkey) == 6) {
      keytype = EVP_PKEY_DSA;
    } else if (sk_ASN1_TYPE_num(inkey) == 4) {
      keytype = EVP_PKEY_EC;
    } else if (sk_ASN1_TYPE_num(inkey) == 3) {
      /* This seems to be PKCS8, not traditional format */
      PKCS8_PRIV_KEY_INFO *p8 = d2i_PKCS8_PRIV_KEY_INFO(NULL, inp, len);
      EVP_PKEY *ret;
  
      sk_ASN1_TYPE_pop_free(inkey, ASN1_TYPE_free);
      if (!p8) {
        OPENSSL_PUT_ERROR(EVP, EVP_R_UNSUPPORTED_PUBLIC_KEY_TYPE);
        return NULL;
      }
      ret = EVP_PKCS82PKEY(p8);
      PKCS8_PRIV_KEY_INFO_free(p8);
      if (out) {
        *out = ret;
      }
      return ret;
    } else {
      keytype = EVP_PKEY_RSA;
    }
  
    sk_ASN1_TYPE_pop_free(inkey, ASN1_TYPE_free);
    return d2i_PrivateKey(keytype, out, inp, len);
  }
  
  int i2d_PublicKey(EVP_PKEY *key, uint8_t **outp) {
    switch (key->type) {
      case EVP_PKEY_RSA:
        return i2d_RSAPublicKey(key->pkey.rsa, outp);
      case EVP_PKEY_DSA:
        return i2d_DSAPublicKey(key->pkey.dsa, outp);
      case EVP_PKEY_EC:
        return i2o_ECPublicKey(key->pkey.ec, outp);
      default:
        OPENSSL_PUT_ERROR(EVP, EVP_R_UNSUPPORTED_PUBLIC_KEY_TYPE);
        return -1;
    }
  }
  