openssl/crypto/evp/p_open.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 "internal/cryptlib.h"
#ifdef OPENSSL_NO_RSA
NON_EMPTY_TRANSLATION_UNIT
#else

# include <stdio.h>
# 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_reset(ctx);
        if (!EVP_DecryptInit_ex(ctx, type, NULL, NULL, NULL))
            return 0;
    }

    if (!priv)
        return 1;

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

    size = EVP_PKEY_size(priv);
    key = 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:
    OPENSSL_clear_free(key, size);
    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);
}
#endif