/* crypto/pem/pem_seal.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 <openssl/opensslconf.h>	/* for OPENSSL_NO_RSA */

#ifndef OPENSSL_NO_RSA

#include <stdio.h>

#include "cryptlib.h"

#include <openssl/evp.h>

#include <openssl/rand.h>

#include <openssl/objects.h>

#include <openssl/x509.h>

#include <openssl/pem.h>

#include <openssl/rsa.h>

EXPORT_C int PEM_SealInit(PEM_ENCODE_SEAL_CTX *ctx, EVP_CIPHER *type, EVP_MD *md_type,

	     unsigned char **ek, int *ekl, unsigned char *iv, EVP_PKEY **pubk,

	     int npubk)

	{

	unsigned char key[EVP_MAX_KEY_LENGTH];

	int ret= -1;

	int i,j,max=0;

	char *s=NULL;

	for (i=0; i<npubk; i++)

		{

		if (pubk[i]->type != EVP_PKEY_RSA)

			{

			PEMerr(PEM_F_PEM_SEALINIT,PEM_R_PUBLIC_KEY_NO_RSA);

			goto err;

			}

		j=RSA_size(pubk[i]->pkey.rsa);

		if (j > max) max=j;

		}

	s=(char *)OPENSSL_malloc(max*2);

	if (s == NULL)

		{

		PEMerr(PEM_F_PEM_SEALINIT,ERR_R_MALLOC_FAILURE);

		goto err;

		}

	EVP_EncodeInit(&ctx->encode);

	EVP_MD_CTX_init(&ctx->md);

	EVP_SignInit(&ctx->md,md_type);

	EVP_CIPHER_CTX_init(&ctx->cipher);

	ret=EVP_SealInit(&ctx->cipher,type,ek,ekl,iv,pubk,npubk);

	if (!ret) goto err;

	/* base64 encode the keys */

	for (i=0; i<npubk; i++)

		{

		j=EVP_EncodeBlock((unsigned char *)s,ek[i],

			RSA_size(pubk[i]->pkey.rsa));

		ekl[i]=j;

		memcpy(ek[i],s,j+1);

		}

	ret=npubk;

err:

	if (s != NULL) OPENSSL_free(s);

	OPENSSL_cleanse(key,EVP_MAX_KEY_LENGTH);

	return(ret);

	}

EXPORT_C void PEM_SealUpdate(PEM_ENCODE_SEAL_CTX *ctx, unsigned char *out, int *outl,

	     unsigned char *in, int inl)

	{

	unsigned char buffer[1600];

	int i,j;

	*outl=0;

	EVP_SignUpdate(&ctx->md,in,inl);

	for (;;)

		{

		if (inl <= 0) break;

		if (inl > 1200)

			i=1200;

		else

			i=inl;

		EVP_EncryptUpdate(&ctx->cipher,buffer,&j,in,i);

		EVP_EncodeUpdate(&ctx->encode,out,&j,buffer,j);

		*outl+=j;

		out+=j;

		in+=i;

		inl-=i;

		}

	}

EXPORT_C int PEM_SealFinal(PEM_ENCODE_SEAL_CTX *ctx, unsigned char *sig, int *sigl,

	     unsigned char *out, int *outl, EVP_PKEY *priv)

	{

	unsigned char *s=NULL;

	int ret=0,j;

	unsigned int i;

	if (priv->type != EVP_PKEY_RSA)

		{

		PEMerr(PEM_F_PEM_SEALFINAL,PEM_R_PUBLIC_KEY_NO_RSA);

		goto err;

		}

	i=RSA_size(priv->pkey.rsa);

	if (i < 100) i=100;

	s=(unsigned char *)OPENSSL_malloc(i*2);

	if (s == NULL)

		{

		PEMerr(PEM_F_PEM_SEALFINAL,ERR_R_MALLOC_FAILURE);

		goto err;

		}

	EVP_EncryptFinal_ex(&ctx->cipher,s,(int *)&i);

	EVP_EncodeUpdate(&ctx->encode,out,&j,s,i);

	*outl=j;

	out+=j;

	EVP_EncodeFinal(&ctx->encode,out,&j);

	*outl+=j;

	if (!EVP_SignFinal(&ctx->md,s,&i,priv)) goto err;

	*sigl=EVP_EncodeBlock(sig,s,i);

	ret=1;

err:

	EVP_MD_CTX_cleanup(&ctx->md);

	EVP_CIPHER_CTX_cleanup(&ctx->cipher);

	if (s != NULL) OPENSSL_free(s);

	return(ret);

	}

#else /* !OPENSSL_NO_RSA */

# if PEDANTIC

static void *dummy=&dummy;

# endif

#endif