sl@0: /* crypto/pem/pem_seal.c */
sl@0: /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
sl@0:  * All rights reserved.
sl@0:  *
sl@0:  * This package is an SSL implementation written
sl@0:  * by Eric Young (eay@cryptsoft.com).
sl@0:  * The implementation was written so as to conform with Netscapes SSL.
sl@0:  * 
sl@0:  * This library is free for commercial and non-commercial use as long as
sl@0:  * the following conditions are aheared to.  The following conditions
sl@0:  * apply to all code found in this distribution, be it the RC4, RSA,
sl@0:  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
sl@0:  * included with this distribution is covered by the same copyright terms
sl@0:  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
sl@0:  * 
sl@0:  * Copyright remains Eric Young's, and as such any Copyright notices in
sl@0:  * the code are not to be removed.
sl@0:  * If this package is used in a product, Eric Young should be given attribution
sl@0:  * as the author of the parts of the library used.
sl@0:  * This can be in the form of a textual message at program startup or
sl@0:  * in documentation (online or textual) provided with the package.
sl@0:  * 
sl@0:  * Redistribution and use in source and binary forms, with or without
sl@0:  * modification, are permitted provided that the following conditions
sl@0:  * are met:
sl@0:  * 1. Redistributions of source code must retain the copyright
sl@0:  *    notice, this list of conditions and the following disclaimer.
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in the
sl@0:  *    documentation and/or other materials provided with the distribution.
sl@0:  * 3. All advertising materials mentioning features or use of this software
sl@0:  *    must display the following acknowledgement:
sl@0:  *    "This product includes cryptographic software written by
sl@0:  *     Eric Young (eay@cryptsoft.com)"
sl@0:  *    The word 'cryptographic' can be left out if the rouines from the library
sl@0:  *    being used are not cryptographic related :-).
sl@0:  * 4. If you include any Windows specific code (or a derivative thereof) from 
sl@0:  *    the apps directory (application code) you must include an acknowledgement:
sl@0:  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
sl@0:  * 
sl@0:  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
sl@0:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
sl@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
sl@0:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
sl@0:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
sl@0:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
sl@0:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
sl@0:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
sl@0:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
sl@0:  * SUCH DAMAGE.
sl@0:  * 
sl@0:  * The licence and distribution terms for any publically available version or
sl@0:  * derivative of this code cannot be changed.  i.e. this code cannot simply be
sl@0:  * copied and put under another distribution licence
sl@0:  * [including the GNU Public Licence.]
sl@0:  */
sl@0: 
sl@0: #include <openssl/opensslconf.h>	/* for OPENSSL_NO_RSA */
sl@0: #ifndef OPENSSL_NO_RSA
sl@0: #include <stdio.h>
sl@0: #include "cryptlib.h"
sl@0: #include <openssl/evp.h>
sl@0: #include <openssl/rand.h>
sl@0: #include <openssl/objects.h>
sl@0: #include <openssl/x509.h>
sl@0: #include <openssl/pem.h>
sl@0: #include <openssl/rsa.h>
sl@0: 
sl@0: EXPORT_C int PEM_SealInit(PEM_ENCODE_SEAL_CTX *ctx, EVP_CIPHER *type, EVP_MD *md_type,
sl@0: 	     unsigned char **ek, int *ekl, unsigned char *iv, EVP_PKEY **pubk,
sl@0: 	     int npubk)
sl@0: 	{
sl@0: 	unsigned char key[EVP_MAX_KEY_LENGTH];
sl@0: 	int ret= -1;
sl@0: 	int i,j,max=0;
sl@0: 	char *s=NULL;
sl@0: 
sl@0: 	for (i=0; i<npubk; i++)
sl@0: 		{
sl@0: 		if (pubk[i]->type != EVP_PKEY_RSA)
sl@0: 			{
sl@0: 			PEMerr(PEM_F_PEM_SEALINIT,PEM_R_PUBLIC_KEY_NO_RSA);
sl@0: 			goto err;
sl@0: 			}
sl@0: 		j=RSA_size(pubk[i]->pkey.rsa);
sl@0: 		if (j > max) max=j;
sl@0: 		}
sl@0: 	s=(char *)OPENSSL_malloc(max*2);
sl@0: 	if (s == NULL)
sl@0: 		{
sl@0: 		PEMerr(PEM_F_PEM_SEALINIT,ERR_R_MALLOC_FAILURE);
sl@0: 		goto err;
sl@0: 		}
sl@0: 
sl@0: 	EVP_EncodeInit(&ctx->encode);
sl@0: 
sl@0: 	EVP_MD_CTX_init(&ctx->md);
sl@0: 	EVP_SignInit(&ctx->md,md_type);
sl@0: 
sl@0: 	EVP_CIPHER_CTX_init(&ctx->cipher);
sl@0: 	ret=EVP_SealInit(&ctx->cipher,type,ek,ekl,iv,pubk,npubk);
sl@0: 	if (!ret) goto err;
sl@0: 
sl@0: 	/* base64 encode the keys */
sl@0: 	for (i=0; i<npubk; i++)
sl@0: 		{
sl@0: 		j=EVP_EncodeBlock((unsigned char *)s,ek[i],
sl@0: 			RSA_size(pubk[i]->pkey.rsa));
sl@0: 		ekl[i]=j;
sl@0: 		memcpy(ek[i],s,j+1);
sl@0: 		}
sl@0: 
sl@0: 	ret=npubk;
sl@0: err:
sl@0: 	if (s != NULL) OPENSSL_free(s);
sl@0: 	OPENSSL_cleanse(key,EVP_MAX_KEY_LENGTH);
sl@0: 	return(ret);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void PEM_SealUpdate(PEM_ENCODE_SEAL_CTX *ctx, unsigned char *out, int *outl,
sl@0: 	     unsigned char *in, int inl)
sl@0: 	{
sl@0: 	unsigned char buffer[1600];
sl@0: 	int i,j;
sl@0: 
sl@0: 	*outl=0;
sl@0: 	EVP_SignUpdate(&ctx->md,in,inl);
sl@0: 	for (;;)
sl@0: 		{
sl@0: 		if (inl <= 0) break;
sl@0: 		if (inl > 1200)
sl@0: 			i=1200;
sl@0: 		else
sl@0: 			i=inl;
sl@0: 		EVP_EncryptUpdate(&ctx->cipher,buffer,&j,in,i);
sl@0: 		EVP_EncodeUpdate(&ctx->encode,out,&j,buffer,j);
sl@0: 		*outl+=j;
sl@0: 		out+=j;
sl@0: 		in+=i;
sl@0: 		inl-=i;
sl@0: 		}
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int PEM_SealFinal(PEM_ENCODE_SEAL_CTX *ctx, unsigned char *sig, int *sigl,
sl@0: 	     unsigned char *out, int *outl, EVP_PKEY *priv)
sl@0: 	{
sl@0: 	unsigned char *s=NULL;
sl@0: 	int ret=0,j;
sl@0: 	unsigned int i;
sl@0: 
sl@0: 	if (priv->type != EVP_PKEY_RSA)
sl@0: 		{
sl@0: 		PEMerr(PEM_F_PEM_SEALFINAL,PEM_R_PUBLIC_KEY_NO_RSA);
sl@0: 		goto err;
sl@0: 		}
sl@0: 	i=RSA_size(priv->pkey.rsa);
sl@0: 	if (i < 100) i=100;
sl@0: 	s=(unsigned char *)OPENSSL_malloc(i*2);
sl@0: 	if (s == NULL)
sl@0: 		{
sl@0: 		PEMerr(PEM_F_PEM_SEALFINAL,ERR_R_MALLOC_FAILURE);
sl@0: 		goto err;
sl@0: 		}
sl@0: 
sl@0: 	EVP_EncryptFinal_ex(&ctx->cipher,s,(int *)&i);
sl@0: 	EVP_EncodeUpdate(&ctx->encode,out,&j,s,i);
sl@0: 	*outl=j;
sl@0: 	out+=j;
sl@0: 	EVP_EncodeFinal(&ctx->encode,out,&j);
sl@0: 	*outl+=j;
sl@0: 
sl@0: 	if (!EVP_SignFinal(&ctx->md,s,&i,priv)) goto err;
sl@0: 	*sigl=EVP_EncodeBlock(sig,s,i);
sl@0: 
sl@0: 	ret=1;
sl@0: err:
sl@0: 	EVP_MD_CTX_cleanup(&ctx->md);
sl@0: 	EVP_CIPHER_CTX_cleanup(&ctx->cipher);
sl@0: 	if (s != NULL) OPENSSL_free(s);
sl@0: 	return(ret);
sl@0: 	}
sl@0: #else /* !OPENSSL_NO_RSA */
sl@0: 
sl@0: # if PEDANTIC
sl@0: static void *dummy=&dummy;
sl@0: # endif
sl@0: 
sl@0: #endif