text: /* $OpenBSD: pmeth_gn.c,v 1.6 2017/01/29 17:49:23 beck Exp $ */
  /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
   * project 2006.
   */
  /* ====================================================================
   * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
   *
   * 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 above 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 acknowledgment:
   *    "This product includes software developed by the OpenSSL Project
   *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
   *
   * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
   *    endorse or promote products derived from this software without
   *    prior written permission. For written permission, please contact
   *    licensing@OpenSSL.org.
   *
   * 5. Products derived from this software may not be called "OpenSSL"
   *    nor may "OpenSSL" appear in their names without prior written
   *    permission of the OpenSSL Project.
   *
   * 6. Redistributions of any form whatsoever must retain the following
   *    acknowledgment:
   *    "This product includes software developed by the OpenSSL Project
   *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
   *
   * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
   * EXPRESSED 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 OpenSSL PROJECT OR
   * ITS 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.
   * ====================================================================
   *
   * This product includes cryptographic software written by Eric Young
   * (eay@cryptsoft.com).  This product includes software written by Tim
   * Hudson (tjh@cryptsoft.com).
   *
   */
  
  #include <stdio.h>
  #include <stdlib.h>
  
  #include <openssl/bn.h>
  #include <openssl/err.h>
  #include <openssl/evp.h>
  #include <openssl/objects.h>
  
  #include "evp_locl.h"
  
  int
  EVP_PKEY_paramgen_init(EVP_PKEY_CTX *ctx)
  {
  	int ret;
  
  	if (!ctx || !ctx->pmeth || !ctx->pmeth->paramgen) {
  		EVPerror(EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
  		return -2;
  	}
  	ctx->operation = EVP_PKEY_OP_PARAMGEN;
  	if (!ctx->pmeth->paramgen_init)
  		return 1;
  	ret = ctx->pmeth->paramgen_init(ctx);
  	if (ret <= 0)
  		ctx->operation = EVP_PKEY_OP_UNDEFINED;
  	return ret;
  }
  
  int
  EVP_PKEY_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey)
  {
  	int ret;
  
  	if (!ctx || !ctx->pmeth || !ctx->pmeth->paramgen) {
  		EVPerror(EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
  		return -2;
  	}
  
  	if (ctx->operation != EVP_PKEY_OP_PARAMGEN) {
  		EVPerror(EVP_R_OPERATON_NOT_INITIALIZED);
  		return -1;
  	}
  
  	if (!ppkey)
  		return -1;
  
  	if (!*ppkey)
  		*ppkey = EVP_PKEY_new();
  
  	ret = ctx->pmeth->paramgen(ctx, *ppkey);
  	if (ret <= 0) {
  		EVP_PKEY_free(*ppkey);
  		*ppkey = NULL;
  	}
  	return ret;
  }
  
  int
  EVP_PKEY_keygen_init(EVP_PKEY_CTX *ctx)
  {
  	int ret;
  
  	if (!ctx || !ctx->pmeth || !ctx->pmeth->keygen) {
  		EVPerror(EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
  		return -2;
  	}
  	ctx->operation = EVP_PKEY_OP_KEYGEN;
  	if (!ctx->pmeth->keygen_init)
  		return 1;
  	ret = ctx->pmeth->keygen_init(ctx);
  	if (ret <= 0)
  		ctx->operation = EVP_PKEY_OP_UNDEFINED;
  	return ret;
  }
  
  int
  EVP_PKEY_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey)
  {
  	int ret;
  
  	if (!ctx || !ctx->pmeth || !ctx->pmeth->keygen) {
  		EVPerror(EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
  		return -2;
  	}
  	if (ctx->operation != EVP_PKEY_OP_KEYGEN) {
  		EVPerror(EVP_R_OPERATON_NOT_INITIALIZED);
  		return -1;
  	}
  
  	if (!ppkey)
  		return -1;
  
  	if (!*ppkey)
  		*ppkey = EVP_PKEY_new();
  
  	ret = ctx->pmeth->keygen(ctx, *ppkey);
  	if (ret <= 0) {
  		EVP_PKEY_free(*ppkey);
  		*ppkey = NULL;
  	}
  	return ret;
  }
  
  void
  EVP_PKEY_CTX_set_cb(EVP_PKEY_CTX *ctx, EVP_PKEY_gen_cb *cb)
  {
  	ctx->pkey_gencb = cb;
  }
  
  EVP_PKEY_gen_cb *
  EVP_PKEY_CTX_get_cb(EVP_PKEY_CTX *ctx)
  {
  	return ctx->pkey_gencb;
  }
  
  /* "translation callback" to call EVP_PKEY_CTX callbacks using BN_GENCB
   * style callbacks.
   */
  
  static int
  trans_cb(int a, int b, BN_GENCB *gcb)
  {
  	EVP_PKEY_CTX *ctx = gcb->arg;
  	ctx->keygen_info[0] = a;
  	ctx->keygen_info[1] = b;
  	return ctx->pkey_gencb(ctx);
  }
  
  void
  evp_pkey_set_cb_translate(BN_GENCB *cb, EVP_PKEY_CTX *ctx)
  {
  	BN_GENCB_set(cb, trans_cb, ctx)
  }
  
  int
  EVP_PKEY_CTX_get_keygen_info(EVP_PKEY_CTX *ctx, int idx)
  {
  	if (idx == -1)
  		return ctx->keygen_info_count;
  	if (idx < 0 || idx > ctx->keygen_info_count)
  		return 0;
  	return ctx->keygen_info[idx];
  }
  
  EVP_PKEY *
  EVP_PKEY_new_mac_key(int type, ENGINE *e, const unsigned char *key, int keylen)
  {
  	EVP_PKEY_CTX *mac_ctx = NULL;
  	EVP_PKEY *mac_key = NULL;
  
  	mac_ctx = EVP_PKEY_CTX_new_id(type, e);
  	if (!mac_ctx)
  		return NULL;
  	if (EVP_PKEY_keygen_init(mac_ctx) <= 0)
  		goto merr;
  	if (EVP_PKEY_CTX_ctrl(mac_ctx, -1, EVP_PKEY_OP_KEYGEN,
  	    EVP_PKEY_CTRL_SET_MAC_KEY, keylen, (void *)key) <= 0)
  		goto merr;
  	if (EVP_PKEY_keygen(mac_ctx, &mac_key) <= 0)
  		goto merr;
  
  merr:
  	EVP_PKEY_CTX_free(mac_ctx);
  	return mac_key;
  }
  