/* crypto/rsa/rsa_saos.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 <stdio.h>

#include "cryptlib.h"

#include <openssl/bn.h>

#include <openssl/rsa.h>

#include <openssl/objects.h>

#include <openssl/x509.h>

int RSA_sign_ASN1_OCTET_STRING(int type,

                               const unsigned char *m, unsigned int m_len,

                               unsigned char *sigret, unsigned int *siglen,

                               RSA *rsa)

{

    ASN1_OCTET_STRING sig;

    int i, j, ret = 1;

    unsigned char *p, *s;

    sig.type = V_ASN1_OCTET_STRING;

    sig.length = m_len;

    sig.data = (unsigned char *)m;

    i = i2d_ASN1_OCTET_STRING(&sig, NULL);

    j = RSA_size(rsa);

    if (i > (j - RSA_PKCS1_PADDING_SIZE)) {

        RSAerr(RSA_F_RSA_SIGN_ASN1_OCTET_STRING,

               RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);

        return (0);

    }

    s = (unsigned char *)OPENSSL_malloc((unsigned int)j + 1);

    if (s == NULL) {

        RSAerr(RSA_F_RSA_SIGN_ASN1_OCTET_STRING, ERR_R_MALLOC_FAILURE);

        return (0);

    }

    p = s;

    i2d_ASN1_OCTET_STRING(&sig, &p);

    i = RSA_private_encrypt(i, s, sigret, rsa, RSA_PKCS1_PADDING);

    if (i <= 0)

        ret = 0;

    else

        *siglen = i;

    OPENSSL_cleanse(s, (unsigned int)j + 1);

    OPENSSL_free(s);

    return (ret);

}

int RSA_verify_ASN1_OCTET_STRING(int dtype,

                                 const unsigned char *m,

                                 unsigned int m_len, unsigned char *sigbuf,

                                 unsigned int siglen, RSA *rsa)

{

    int i, ret = 0;

    unsigned char *s;

    const unsigned char *p;

    ASN1_OCTET_STRING *sig = NULL;

    if (siglen != (unsigned int)RSA_size(rsa)) {

        RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING,

               RSA_R_WRONG_SIGNATURE_LENGTH);

        return (0);

    }

    s = (unsigned char *)OPENSSL_malloc((unsigned int)siglen);

    if (s == NULL) {

        RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING, ERR_R_MALLOC_FAILURE);

        goto err;

    }

    i = RSA_public_decrypt((int)siglen, sigbuf, s, rsa, RSA_PKCS1_PADDING);

    if (i <= 0)

        goto err;

    p = s;

    sig = d2i_ASN1_OCTET_STRING(NULL, &p, (long)i);

    if (sig == NULL)

        goto err;

    if (((unsigned int)sig->length != m_len) ||

        (memcmp(m, sig->data, m_len) != 0)) {

        RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING, RSA_R_BAD_SIGNATURE);

    } else

        ret = 1;

 err:

    if (sig != NULL)

        M_ASN1_OCTET_STRING_free(sig);

    if (s != NULL) {

        OPENSSL_cleanse(s, (unsigned int)siglen);

        OPENSSL_free(s);

    }

    return (ret);

}