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 <assert.h>
  #include <string.h>
  
  #include <openssl/bio.h>
  #include <openssl/dh.h>
  #include <openssl/dsa.h>
  #include <openssl/ec.h>
  #include <openssl/err.h>
  #include <openssl/mem.h>
  #include <openssl/obj.h>
  #include <openssl/rsa.h>
  #include <openssl/thread.h>
  
  #include "internal.h"
  #include "../internal.h"
  
  
  extern const EVP_PKEY_ASN1_METHOD dsa_asn1_meth;
  extern const EVP_PKEY_ASN1_METHOD ec_asn1_meth;
  extern const EVP_PKEY_ASN1_METHOD rsa_asn1_meth;
  
  EVP_PKEY *EVP_PKEY_new(void) {
    EVP_PKEY *ret;
  
    ret = OPENSSL_malloc(sizeof(EVP_PKEY));
    if (ret == NULL) {
      OPENSSL_PUT_ERROR(EVP, ERR_R_MALLOC_FAILURE);
      return NULL;
    }
  
    memset(ret, 0, sizeof(EVP_PKEY));
    ret->type = EVP_PKEY_NONE;
    ret->references = 1;
  
    return ret;
  }
  
  static void free_it(EVP_PKEY *pkey) {
    if (pkey->ameth && pkey->ameth->pkey_free) {
      pkey->ameth->pkey_free(pkey);
      pkey->pkey.ptr = NULL;
      pkey->type = EVP_PKEY_NONE;
    }
  }
  
  void EVP_PKEY_free(EVP_PKEY *pkey) {
    if (pkey == NULL) {
      return;
    }
  
    if (!CRYPTO_refcount_dec_and_test_zero(&pkey->references)) {
      return;
    }
  
    free_it(pkey);
    OPENSSL_free(pkey);
  }
  
  EVP_PKEY *EVP_PKEY_up_ref(EVP_PKEY *pkey) {
    CRYPTO_refcount_inc(&pkey->references);
    return pkey;
  }
  
  int EVP_PKEY_is_opaque(const EVP_PKEY *pkey) {
    if (pkey->ameth && pkey->ameth->pkey_opaque) {
      return pkey->ameth->pkey_opaque(pkey);
    }
    return 0;
  }
  
  int EVP_PKEY_supports_digest(const EVP_PKEY *pkey, const EVP_MD *md) {
    if (pkey->ameth && pkey->ameth->pkey_supports_digest) {
      return pkey->ameth->pkey_supports_digest(pkey, md);
    }
    return 1;
  }
  
  int EVP_PKEY_cmp(const EVP_PKEY *a, const EVP_PKEY *b) {
    if (a->type != b->type) {
      return -1;
    }
  
    if (a->ameth) {
      int ret;
      /* Compare parameters if the algorithm has them */
      if (a->ameth->param_cmp) {
        ret = a->ameth->param_cmp(a, b);
        if (ret <= 0) {
          return ret;
        }
      }
  
      if (a->ameth->pub_cmp) {
        return a->ameth->pub_cmp(a, b);
      }
    }
  
    return -2;
  }
  
  int EVP_PKEY_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from) {
    if (to->type != from->type) {
      OPENSSL_PUT_ERROR(EVP, EVP_R_DIFFERENT_KEY_TYPES);
      goto err;
    }
  
    if (EVP_PKEY_missing_parameters(from)) {
      OPENSSL_PUT_ERROR(EVP, EVP_R_MISSING_PARAMETERS);
      goto err;
    }
  
    if (from->ameth && from->ameth->param_copy) {
      return from->ameth->param_copy(to, from);
    }
  
  err:
    return 0;
  }
  
  int EVP_PKEY_missing_parameters(const EVP_PKEY *pkey) {
    if (pkey->ameth && pkey->ameth->param_missing) {
      return pkey->ameth->param_missing(pkey);
    }
    return 0;
  }
  
  int EVP_PKEY_size(const EVP_PKEY *pkey) {
    if (pkey && pkey->ameth && pkey->ameth->pkey_size) {
      return pkey->ameth->pkey_size(pkey);
    }
    return 0;
  }
  
  int EVP_PKEY_bits(EVP_PKEY *pkey) {
    if (pkey && pkey->ameth && pkey->ameth->pkey_bits) {
      return pkey->ameth->pkey_bits(pkey);
    }
    return 0;
  }
  
  int EVP_PKEY_id(const EVP_PKEY *pkey) {
    return pkey->type;
  }
  
  /* TODO(fork): remove the first argument. */
  const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_find(ENGINE **pengine, int nid) {
    switch (nid) {
      case EVP_PKEY_RSA:
      case EVP_PKEY_RSA2:
        return &rsa_asn1_meth;
      case EVP_PKEY_EC:
        return &ec_asn1_meth;
      case EVP_PKEY_DSA:
        return &dsa_asn1_meth;
      default:
        return NULL;
    }
  }
  
  int EVP_PKEY_type(int nid) {
    const EVP_PKEY_ASN1_METHOD *meth = EVP_PKEY_asn1_find(NULL, nid);
    if (meth == NULL) {
      return NID_undef;
    }
    return meth->pkey_id;
  }
  
  int EVP_PKEY_set1_RSA(EVP_PKEY *pkey, RSA *key) {
    if (EVP_PKEY_assign_RSA(pkey, key)) {
      RSA_up_ref(key);
      return 1;
    }
    return 0;
  }
  
  int EVP_PKEY_assign_RSA(EVP_PKEY *pkey, RSA *key) {
    return EVP_PKEY_assign(pkey, EVP_PKEY_RSA, key);
  }
  
  RSA *EVP_PKEY_get1_RSA(EVP_PKEY *pkey) {
    if (pkey->type != EVP_PKEY_RSA) {
      OPENSSL_PUT_ERROR(EVP, EVP_R_EXPECTING_AN_RSA_KEY);
      return NULL;
    }
    RSA_up_ref(pkey->pkey.rsa);
    return pkey->pkey.rsa;
  }
  
  int EVP_PKEY_set1_DSA(EVP_PKEY *pkey, DSA *key) {
    if (EVP_PKEY_assign_DSA(pkey, key)) {
      DSA_up_ref(key);
      return 1;
    }
    return 0;
  }
  
  int EVP_PKEY_assign_DSA(EVP_PKEY *pkey, DSA *key) {
    return EVP_PKEY_assign(pkey, EVP_PKEY_DSA, key);
  }
  
  DSA *EVP_PKEY_get1_DSA(EVP_PKEY *pkey) {
    if (pkey->type != EVP_PKEY_DSA) {
      OPENSSL_PUT_ERROR(EVP, EVP_R_EXPECTING_A_DSA_KEY);
      return NULL;
    }
    DSA_up_ref(pkey->pkey.dsa);
    return pkey->pkey.dsa;
  }
  
  int EVP_PKEY_set1_EC_KEY(EVP_PKEY *pkey, EC_KEY *key) {
    if (EVP_PKEY_assign_EC_KEY(pkey, key)) {
      EC_KEY_up_ref(key);
      return 1;
    }
    return 0;
  }
  
  int EVP_PKEY_assign_EC_KEY(EVP_PKEY *pkey, EC_KEY *key) {
    return EVP_PKEY_assign(pkey, EVP_PKEY_EC, key);
  }
  
  EC_KEY *EVP_PKEY_get1_EC_KEY(EVP_PKEY *pkey) {
    if (pkey->type != EVP_PKEY_EC) {
      OPENSSL_PUT_ERROR(EVP, EVP_R_EXPECTING_AN_EC_KEY_KEY);
      return NULL;
    }
    EC_KEY_up_ref(pkey->pkey.ec);
    return pkey->pkey.ec;
  }
  
  int EVP_PKEY_set1_DH(EVP_PKEY *pkey, DH *key) {
    if (EVP_PKEY_assign_DH(pkey, key)) {
      DH_up_ref(key);
      return 1;
    }
    return 0;
  }
  
  int EVP_PKEY_assign_DH(EVP_PKEY *pkey, DH *key) {
    return EVP_PKEY_assign(pkey, EVP_PKEY_DH, key);
  }
  
  DH *EVP_PKEY_get1_DH(EVP_PKEY *pkey) {
    if (pkey->type != EVP_PKEY_DH) {
      OPENSSL_PUT_ERROR(EVP, EVP_R_EXPECTING_A_DH_KEY);
      return NULL;
    }
    DH_up_ref(pkey->pkey.dh);
    return pkey->pkey.dh;
  }
  
  int EVP_PKEY_assign(EVP_PKEY *pkey, int type, void *key) {
    if (!EVP_PKEY_set_type(pkey, type)) {
      return 0;
    }
    pkey->pkey.ptr = key;
    return key != NULL;
  }
  
  const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_find_str(ENGINE **pengine,
                                                     const char *name,
                                                     size_t len) {
    if (len == 3 && memcmp(name, "RSA", 3) == 0) {
      return &rsa_asn1_meth;
    } if (len == 2 && memcmp(name, "EC", 2) == 0) {
      return &ec_asn1_meth;
    }
    return NULL;
  }
  
  int EVP_PKEY_set_type(EVP_PKEY *pkey, int type) {
    const EVP_PKEY_ASN1_METHOD *ameth;
  
    if (pkey && pkey->pkey.ptr) {
      free_it(pkey);
    }
  
    ameth = EVP_PKEY_asn1_find(NULL, type);
    if (ameth == NULL) {
      OPENSSL_PUT_ERROR(EVP, EVP_R_UNSUPPORTED_ALGORITHM);
      ERR_add_error_dataf("algorithm %d (%s)", type, OBJ_nid2sn(type));
      return 0;
    }
  
    if (pkey) {
      pkey->ameth = ameth;
      pkey->type = pkey->ameth->pkey_id;
    }
  
    return 1;
  }
  
  
  
  int EVP_PKEY_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b) {
    if (a->type != b->type) {
      return -1;
    }
    if (a->ameth && a->ameth->param_cmp) {
      return a->ameth->param_cmp(a, b);
    }
    return -2;
  }
  
  static int print_unsupported(BIO *out, const EVP_PKEY *pkey, int indent,
                               const char *kstr) {
    BIO_indent(out, indent, 128);
    BIO_printf(out, "%s algorithm \"%s\" unsupported\n", kstr,
               OBJ_nid2ln(pkey->type));
    return 1;
  }
  
  int EVP_PKEY_print_public(BIO *out, const EVP_PKEY *pkey, int indent,
                            ASN1_PCTX *pctx) {
    if (pkey->ameth && pkey->ameth->pub_print) {
      return pkey->ameth->pub_print(out, pkey, indent, pctx);
    }
  
    return print_unsupported(out, pkey, indent, "Public Key");
  }
  
  int EVP_PKEY_print_private(BIO *out, const EVP_PKEY *pkey, int indent,
                             ASN1_PCTX *pctx) {
    if (pkey->ameth && pkey->ameth->priv_print) {
      return pkey->ameth->priv_print(out, pkey, indent, pctx);
    }
  
    return print_unsupported(out, pkey, indent, "Private Key");
  }
  
  int EVP_PKEY_print_params(BIO *out, const EVP_PKEY *pkey, int indent,
                            ASN1_PCTX *pctx) {
    if (pkey->ameth && pkey->ameth->param_print) {
      return pkey->ameth->param_print(out, pkey, indent, pctx);
    }
  
    return print_unsupported(out, pkey, indent, "Parameters");
  }
  
  int EVP_PKEY_CTX_set_signature_md(EVP_PKEY_CTX *ctx, const EVP_MD *md) {
    return EVP_PKEY_CTX_ctrl(ctx, -1, EVP_PKEY_OP_TYPE_SIG, EVP_PKEY_CTRL_MD, 0,
                             (void *)md);
  }
  
  int EVP_PKEY_CTX_get_signature_md(EVP_PKEY_CTX *ctx, const EVP_MD **out_md) {
    return EVP_PKEY_CTX_ctrl(ctx, -1, EVP_PKEY_OP_TYPE_SIG, EVP_PKEY_CTRL_GET_MD,
                             0, (void *)out_md);
  }
  
  void OpenSSL_add_all_algorithms(void) {}
  
  void OpenSSL_add_all_ciphers(void) {}
  
  void OpenSSL_add_all_digests(void) {}
  
  void EVP_cleanup(void) {}
  