text: /* crypto/pem/pem_sign.c */
  /* 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 <stdio.h>
  #include "cryptlib.h"
  #include <openssl/rand.h>
  #include <openssl/evp.h>
  #include <openssl/objects.h>
  #include <openssl/x509.h>
  #include <openssl/pem.h>
  
  void PEM_SignInit(EVP_MD_CTX *ctx, EVP_MD *type)
  	{
  	EVP_DigestInit_ex(ctx, type, NULL);
  	}
  
  void PEM_SignUpdate(EVP_MD_CTX *ctx, unsigned char *data,
  	     unsigned int count)
  	{
  	EVP_DigestUpdate(ctx,data,count);
  	}
  
  int PEM_SignFinal(EVP_MD_CTX *ctx, unsigned char *sigret, unsigned int *siglen,
  	     EVP_PKEY *pkey)
  	{
  	unsigned char *m;
  	int i,ret=0;
  	unsigned int m_len;
  
  	m=(unsigned char *)OPENSSL_malloc(EVP_PKEY_size(pkey)+2);
  	if (m == NULL)
  		{
  		PEMerr(PEM_F_PEM_SIGNFINAL,ERR_R_MALLOC_FAILURE);
  		goto err;
  		}
  
  	if (EVP_SignFinal(ctx,m,&m_len,pkey) <= 0) goto err;
  
  	i=EVP_EncodeBlock(sigret,m,m_len);
  	*siglen=i;
  	ret=1;
  err:
  	/* ctx has been zeroed by EVP_SignFinal() */
  	if (m != NULL) OPENSSL_free(m);
  	return(ret);
  	}
  
  