/* crypto/asn1/a_sign.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.]

 */

/* ====================================================================

 * Copyright (c) 1998-2003 The OpenSSL Project.  All rights reserved.

 *

 * 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 above 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 acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"

 *

 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to

 *    endorse or promote products derived from this software without

 *    prior written permission. For written permission, please contact

 *    openssl-core@openssl.org.

 *

 * 5. Products derived from this software may not be called "OpenSSL"

 *    nor may "OpenSSL" appear in their names without prior written

 *    permission of the OpenSSL Project.

 *

 * 6. Redistributions of any form whatsoever must retain the following

 *    acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"

 *

 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY

 * EXPRESSED 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 OpenSSL PROJECT OR

 * ITS 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.

 * ====================================================================

 *

 * This product includes cryptographic software written by Eric Young

 * (eay@cryptsoft.com).  This product includes software written by Tim

 * Hudson (tjh@cryptsoft.com).

 *

 */

#include <stdio.h>

#include <time.h>

#include "cryptlib.h"

#ifndef NO_SYS_TYPES_H

# include <sys/types.h>

#endif

#include <openssl/bn.h>

#include <openssl/evp.h>

#include <openssl/x509.h>

#include <openssl/objects.h>

#include <openssl/buffer.h>

#include "asn1_locl.h"

#ifndef NO_ASN1_OLD

int ASN1_sign(i2d_of_void *i2d, X509_ALGOR *algor1, X509_ALGOR *algor2,

              ASN1_BIT_STRING *signature, char *data, EVP_PKEY *pkey,

              const EVP_MD *type)

{

    EVP_MD_CTX ctx;

    unsigned char *p, *buf_in = NULL, *buf_out = NULL;

    int i, inl = 0, outl = 0, outll = 0;

    X509_ALGOR *a;

    EVP_MD_CTX_init(&ctx);

    for (i = 0; i < 2; i++) {

        if (i == 0)

            a = algor1;

        else

            a = algor2;

        if (a == NULL)

            continue;

        if (type->pkey_type == NID_dsaWithSHA1) {

            /*

             * special case: RFC 2459 tells us to omit 'parameters' with

             * id-dsa-with-sha1

             */

            ASN1_TYPE_free(a->parameter);

            a->parameter = NULL;

        } else if ((a->parameter == NULL) ||

                   (a->parameter->type != V_ASN1_NULL)) {

            ASN1_TYPE_free(a->parameter);

            if ((a->parameter = ASN1_TYPE_new()) == NULL)

                goto err;

            a->parameter->type = V_ASN1_NULL;

        }

        ASN1_OBJECT_free(a->algorithm);

        a->algorithm = OBJ_nid2obj(type->pkey_type);

        if (a->algorithm == NULL) {

            ASN1err(ASN1_F_ASN1_SIGN, ASN1_R_UNKNOWN_OBJECT_TYPE);

            goto err;

        }

        if (a->algorithm->length == 0) {

            ASN1err(ASN1_F_ASN1_SIGN,

                    ASN1_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);

            goto err;

        }

    }

    inl = i2d(data, NULL);

    buf_in = (unsigned char *)OPENSSL_malloc((unsigned int)inl);

    outll = outl = EVP_PKEY_size(pkey);

    buf_out = (unsigned char *)OPENSSL_malloc((unsigned int)outl);

    if ((buf_in == NULL) || (buf_out == NULL)) {

        outl = 0;

        ASN1err(ASN1_F_ASN1_SIGN, ERR_R_MALLOC_FAILURE);

        goto err;

    }

    p = buf_in;

    i2d(data, &p);

    if (!EVP_SignInit_ex(&ctx, type, NULL)

        || !EVP_SignUpdate(&ctx, (unsigned char *)buf_in, inl)

        || !EVP_SignFinal(&ctx, (unsigned char *)buf_out,

                          (unsigned int *)&outl, pkey)) {

        outl = 0;

        ASN1err(ASN1_F_ASN1_SIGN, ERR_R_EVP_LIB);

        goto err;

    }

    if (signature->data != NULL)

        OPENSSL_free(signature->data);

    signature->data = buf_out;

    buf_out = NULL;

    signature->length = outl;

    /*

     * In the interests of compatibility, I'll make sure that the bit string

     * has a 'not-used bits' value of 0

     */

    signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);

    signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;

 err:

    EVP_MD_CTX_cleanup(&ctx);

    if (buf_in != NULL) {

        OPENSSL_cleanse((char *)buf_in, (unsigned int)inl);

        OPENSSL_free(buf_in);

    }

    if (buf_out != NULL) {

        OPENSSL_cleanse((char *)buf_out, outll);

        OPENSSL_free(buf_out);

    }

    return (outl);

}

#endif

int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1,

                   X509_ALGOR *algor2, ASN1_BIT_STRING *signature, void *asn,

                   EVP_PKEY *pkey, const EVP_MD *type)

{

    EVP_MD_CTX ctx;

    EVP_MD_CTX_init(&ctx);

    if (!EVP_DigestSignInit(&ctx, NULL, type, NULL, pkey)) {

        EVP_MD_CTX_cleanup(&ctx);

        return 0;

    }

    return ASN1_item_sign_ctx(it, algor1, algor2, signature, asn, &ctx);

}

int ASN1_item_sign_ctx(const ASN1_ITEM *it,

                       X509_ALGOR *algor1, X509_ALGOR *algor2,

                       ASN1_BIT_STRING *signature, void *asn, EVP_MD_CTX *ctx)

{

    const EVP_MD *type;

    EVP_PKEY *pkey;

    unsigned char *buf_in = NULL, *buf_out = NULL;

    size_t inl = 0, outl = 0, outll = 0;

    int signid, paramtype;

    int rv;

    type = EVP_MD_CTX_md(ctx);

    pkey = EVP_PKEY_CTX_get0_pkey(ctx->pctx);

    if (!type || !pkey) {

        ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_CONTEXT_NOT_INITIALISED);

        return 0;

    }

    if (pkey->ameth->item_sign) {

        rv = pkey->ameth->item_sign(ctx, it, asn, algor1, algor2, signature);

        if (rv == 1)

            outl = signature->length;

        /*-

         * Return value meanings:

         * <=0: error.

         *   1: method does everything.

         *   2: carry on as normal.

         *   3: ASN1 method sets algorithm identifiers: just sign.

         */

        if (rv <= 0)

            ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB);

        if (rv <= 1)

            goto err;

    } else

        rv = 2;

    if (rv == 2) {

        if (type->flags & EVP_MD_FLAG_PKEY_METHOD_SIGNATURE) {

            if (!pkey->ameth ||

                !OBJ_find_sigid_by_algs(&signid,

                                        EVP_MD_nid(type),

                                        pkey->ameth->pkey_id)) {

                ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX,

                        ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);

                return 0;

            }

        } else

            signid = type->pkey_type;

        if (pkey->ameth->pkey_flags & ASN1_PKEY_SIGPARAM_NULL)

            paramtype = V_ASN1_NULL;

        else

            paramtype = V_ASN1_UNDEF;

        if (algor1)

            X509_ALGOR_set0(algor1, OBJ_nid2obj(signid), paramtype, NULL);

        if (algor2)

            X509_ALGOR_set0(algor2, OBJ_nid2obj(signid), paramtype, NULL);

    }

    inl = ASN1_item_i2d(asn, &buf_in, it);

    outll = outl = EVP_PKEY_size(pkey);

    buf_out = OPENSSL_malloc((unsigned int)outl);

    if ((buf_in == NULL) || (buf_out == NULL)) {

        outl = 0;

        ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_MALLOC_FAILURE);

        goto err;

    }

    if (!EVP_DigestSignUpdate(ctx, buf_in, inl)

        || !EVP_DigestSignFinal(ctx, buf_out, &outl)) {

        outl = 0;

        ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB);

        goto err;

    }

    if (signature->data != NULL)

        OPENSSL_free(signature->data);

    signature->data = buf_out;

    buf_out = NULL;

    signature->length = outl;

    /*

     * In the interests of compatibility, I'll make sure that the bit string

     * has a 'not-used bits' value of 0

     */

    signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);

    signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;

 err:

    EVP_MD_CTX_cleanup(ctx);

    if (buf_in != NULL) {

        OPENSSL_cleanse((char *)buf_in, (unsigned int)inl);

        OPENSSL_free(buf_in);

    }

    if (buf_out != NULL) {

        OPENSSL_cleanse((char *)buf_out, outll);

        OPENSSL_free(buf_out);

    }

    return (outl);

}