p_open.c

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/* crypto/evp/p_open.c */
/* Copyright (C) 1995-1998 Eric Young ([email protected])
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young ([email protected]).
 * 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 ([email protected]).
 * 
 * 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 ([email protected])"
 *    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 ([email protected])"
 * 
 * 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"

#ifndef OPENSSL_NO_RSA

#include <openssl/evp.h>
#include <openssl/objects.h>
#include <openssl/x509.h>
#include <openssl/rsa.h>

int EVP_OpenInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *type,
    const unsigned char *ek, int ekl, const unsigned char *iv,
    EVP_PKEY *priv)
    {
    unsigned char *key=NULL;
    int i,size=0,ret=0;

    if(type) {  
        EVP_CIPHER_CTX_init(ctx);
        if(!EVP_DecryptInit_ex(ctx,type,NULL, NULL,NULL)) return 0;
    }

    if(!priv) return 1;

    if (priv->type != EVP_PKEY_RSA)
        {
        EVPerr(EVP_F_EVP_OPENINIT,EVP_R_PUBLIC_KEY_NOT_RSA);
        goto err;
                }

    size=RSA_size(priv->pkey.rsa);
    key=(unsigned char *)OPENSSL_malloc(size+2);
    if (key == NULL)
        {
        /* ERROR */
        EVPerr(EVP_F_EVP_OPENINIT,ERR_R_MALLOC_FAILURE);
        goto err;
        }

    i=EVP_PKEY_decrypt_old(key,ek,ekl,priv);
    if ((i <= 0) || !EVP_CIPHER_CTX_set_key_length(ctx, i))
        {
        /* ERROR */
        goto err;
        }
    if(!EVP_DecryptInit_ex(ctx,NULL,NULL,key,iv)) goto err;

    ret=1;
err:
    if (key != NULL) OPENSSL_cleanse(key,size);
    OPENSSL_free(key);
    return(ret);
    }

int EVP_OpenFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
    {
    int i;

    i=EVP_DecryptFinal_ex(ctx,out,outl);
    if (i)
        i = EVP_DecryptInit_ex(ctx,NULL,NULL,NULL,NULL);
    return(i);
    }
#else /* !OPENSSL_NO_RSA */

# ifdef PEDANTIC
static void *dummy=&dummy;
# endif

#endif