crypto/x509/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.] */

#include <openssl/asn1.h>
#include <openssl/digest.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/mem.h>
#include <openssl/obj.h>
#include <openssl/x509.h>

#include "../evp/internal.h"


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)
	{
	EVP_PKEY *pkey;
	unsigned char *buf_in=NULL,*buf_out=NULL;
	size_t inl=0,outl=0,outll=0;

	pkey = EVP_PKEY_CTX_get0_pkey(ctx->pctx);

	/* Write out the requested copies of the AlgorithmIdentifier. */
	if (algor1 && !EVP_DigestSignAlgorithm(ctx, algor1))
		{
		goto err;
		}
	if (algor2 && !EVP_DigestSignAlgorithm(ctx, algor2))
		{
		goto err;
		}

	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;
		OPENSSL_PUT_ERROR(X509, 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;
		OPENSSL_PUT_ERROR(X509, 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);
	}