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      1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com)
      2  * All rights reserved.
      3  *
      4  * This package is an SSL implementation written
      5  * by Eric Young (eay (at) cryptsoft.com).
      6  * The implementation was written so as to conform with Netscapes SSL.
      7  *
      8  * This library is free for commercial and non-commercial use as long as
      9  * the following conditions are aheared to.  The following conditions
     10  * apply to all code found in this distribution, be it the RC4, RSA,
     11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
     12  * included with this distribution is covered by the same copyright terms
     13  * except that the holder is Tim Hudson (tjh (at) cryptsoft.com).
     14  *
     15  * Copyright remains Eric Young's, and as such any Copyright notices in
     16  * the code are not to be removed.
     17  * If this package is used in a product, Eric Young should be given attribution
     18  * as the author of the parts of the library used.
     19  * This can be in the form of a textual message at program startup or
     20  * in documentation (online or textual) provided with the package.
     21  *
     22  * Redistribution and use in source and binary forms, with or without
     23  * modification, are permitted provided that the following conditions
     24  * are met:
     25  * 1. Redistributions of source code must retain the copyright
     26  *    notice, this list of conditions and the following disclaimer.
     27  * 2. Redistributions in binary form must reproduce the above copyright
     28  *    notice, this list of conditions and the following disclaimer in the
     29  *    documentation and/or other materials provided with the distribution.
     30  * 3. All advertising materials mentioning features or use of this software
     31  *    must display the following acknowledgement:
     32  *    "This product includes cryptographic software written by
     33  *     Eric Young (eay (at) cryptsoft.com)"
     34  *    The word 'cryptographic' can be left out if the rouines from the library
     35  *    being used are not cryptographic related :-).
     36  * 4. If you include any Windows specific code (or a derivative thereof) from
     37  *    the apps directory (application code) you must include an acknowledgement:
     38  *    "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)"
     39  *
     40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
     41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     50  * SUCH DAMAGE.
     51  *
     52  * The licence and distribution terms for any publically available version or
     53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
     54  * copied and put under another distribution licence
     55  * [including the GNU Public Licence.] */
     56 
     57 #include <openssl/asn1.h>
     58 #include <openssl/digest.h>
     59 #include <openssl/err.h>
     60 #include <openssl/evp.h>
     61 #include <openssl/mem.h>
     62 #include <openssl/obj.h>
     63 #include <openssl/x509.h>
     64 
     65 #include "../evp/internal.h"
     66 
     67 
     68 int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1, X509_ALGOR *algor2,
     69 	     ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey,
     70 	     const EVP_MD *type)
     71 	{
     72 	EVP_MD_CTX ctx;
     73 	EVP_MD_CTX_init(&ctx);
     74 	if (!EVP_DigestSignInit(&ctx, NULL, type, NULL, pkey))
     75 		{
     76 		EVP_MD_CTX_cleanup(&ctx);
     77 		return 0;
     78 		}
     79 	return ASN1_item_sign_ctx(it, algor1, algor2, signature, asn, &ctx);
     80 	}
     81 
     82 
     83 int ASN1_item_sign_ctx(const ASN1_ITEM *it,
     84 		X509_ALGOR *algor1, X509_ALGOR *algor2,
     85 	     	ASN1_BIT_STRING *signature, void *asn, EVP_MD_CTX *ctx)
     86 	{
     87 	EVP_PKEY *pkey;
     88 	unsigned char *buf_in=NULL,*buf_out=NULL;
     89 	size_t inl=0,outl=0,outll=0;
     90 
     91 	pkey = EVP_PKEY_CTX_get0_pkey(ctx->pctx);
     92 
     93 	/* Write out the requested copies of the AlgorithmIdentifier. */
     94 	if (algor1 && !EVP_DigestSignAlgorithm(ctx, algor1))
     95 		{
     96 		goto err;
     97 		}
     98 	if (algor2 && !EVP_DigestSignAlgorithm(ctx, algor2))
     99 		{
    100 		goto err;
    101 		}
    102 
    103 	inl=ASN1_item_i2d(asn,&buf_in, it);
    104 	outll=outl=EVP_PKEY_size(pkey);
    105 	buf_out=OPENSSL_malloc((unsigned int)outl);
    106 	if ((buf_in == NULL) || (buf_out == NULL))
    107 		{
    108 		outl=0;
    109 		OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
    110 		goto err;
    111 		}
    112 
    113 	if (!EVP_DigestSignUpdate(ctx, buf_in, inl)
    114 		|| !EVP_DigestSignFinal(ctx, buf_out, &outl))
    115 		{
    116 		outl=0;
    117 		OPENSSL_PUT_ERROR(X509, ERR_R_EVP_LIB);
    118 		goto err;
    119 		}
    120 	if (signature->data != NULL) OPENSSL_free(signature->data);
    121 	signature->data=buf_out;
    122 	buf_out=NULL;
    123 	signature->length=outl;
    124 	/* In the interests of compatibility, I'll make sure that
    125 	 * the bit string has a 'not-used bits' value of 0
    126 	 */
    127 	signature->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
    128 	signature->flags|=ASN1_STRING_FLAG_BITS_LEFT;
    129 err:
    130 	EVP_MD_CTX_cleanup(ctx);
    131 	if (buf_in != NULL)
    132 		{ OPENSSL_cleanse((char *)buf_in,(unsigned int)inl); OPENSSL_free(buf_in); }
    133 	if (buf_out != NULL)
    134 		{ OPENSSL_cleanse((char *)buf_out,outll); OPENSSL_free(buf_out); }
    135 	return(outl);
    136 	}
    137