/* 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