New utility functions for encryptedData content type which will also be used

[thirdparty/openssl.git] / crypto / cms / cms_enc.c

/* crypto/cms/cms_enc.c */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project.
 */
/* ====================================================================
 * Copyright (c) 2008 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
 *    licensing@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.
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 * 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/)"
 *
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
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 */

#include "cryptlib.h"
#include <openssl/asn1t.h>
#include <openssl/pem.h>
#include <openssl/x509v3.h>
#include <openssl/err.h>
#include <openssl/cms.h>
#include <openssl/rand.h>
#include "cms_lcl.h"
#include "asn1_locl.h"

/* CMS EncryptedData Utilities */

/* Set up EncryptedContentInfo based on supplied cipher bio */

int cms_bio_to_EncryptedContent(CMS_EncryptedContentInfo *ec,
					const unsigned char *key, int keylen,
					BIO *b)
	{
	EVP_CIPHER_CTX *ctx = NULL;
	unsigned char iv[EVP_MAX_IV_LENGTH], *piv;
	int ivlen;

	BIO_get_cipher_ctx(b, &ctx);

	/* If necessary set key length */

	if (keylen != EVP_CIPHER_CTX_key_length(ctx))
		{
		if (EVP_CIPHER_CTX_set_key_length(ctx, keylen) <= 0)
			{
			CMSerr(CMS_F_CMS_BIO_TO_ENCRYPTEDCONTENT,
				CMS_R_INVALID_KEY_LENGTH);
			return 0;
			}
		}

	/* Generate a random IV if we need one */

	ivlen = EVP_CIPHER_CTX_iv_length(ctx);
	if (ivlen > 0)
		{
		if (RAND_pseudo_bytes(iv, ivlen) <= 0)
			return 0;
		piv = iv;
		}
	else
		piv = NULL;

	if (EVP_CipherInit_ex(ctx, NULL, NULL, key, piv, 1) <= 0)
		{
		CMSerr(CMS_F_CMS_BIO_TO_ENCRYPTEDCONTENT,
				CMS_R_CIPHER_INITIALISATION_ERROR);
		return 0;
		}

	ec->contentEncryptionAlgorithm->algorithm =
			OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx));

	if (piv)
		{
		ec->contentEncryptionAlgorithm->parameter = ASN1_TYPE_new();
		if (!ec->contentEncryptionAlgorithm->parameter)
			{
			CMSerr(CMS_F_CMS_BIO_TO_ENCRYPTEDCONTENT,
							ERR_R_MALLOC_FAILURE);
			return 0;
			}
		if (EVP_CIPHER_param_to_asn1(ctx, 
			ec->contentEncryptionAlgorithm->parameter) <= 0)
			{
			CMSerr(CMS_F_CMS_BIO_TO_ENCRYPTEDCONTENT,
				CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
			return 0;
			}
		}

	return 1;
	}

/* Return BIO based on EncryptedContentInfo and key */

BIO *cms_EncryptedContent_to_bio(CMS_EncryptedContentInfo *ec,
					const unsigned char *key, int keylen)
	{
	BIO *b;
	EVP_CIPHER_CTX *ctx;
	const EVP_CIPHER *ciph;
	b = BIO_new(BIO_f_cipher());
	if (!b)
		{
		CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO, ERR_R_MALLOC_FAILURE);
		return NULL;
		}
	BIO_get_cipher_ctx(b, &ctx);

	ciph = EVP_get_cipherbyobj(ec->contentEncryptionAlgorithm->algorithm);

	if (!ciph)
		{
		CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO, CMS_R_UNKNOWN_CIPHER);
		goto err;
		}

	if (EVP_CipherInit_ex(ctx, ciph, NULL, NULL, NULL, 0) <= 0)
		{
		CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO,
				CMS_R_CIPHER_INITIALISATION_ERROR);
		goto err;
		}

	/* If necessary set key length */

	if (keylen != EVP_CIPHER_CTX_key_length(ctx))
		{
		if (EVP_CIPHER_CTX_set_key_length(ctx, keylen) <= 0)
			{
			CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO,
				CMS_R_INVALID_KEY_LENGTH);
			goto err;
			}
		}

	if (EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, 0) <= 0)
		{
		CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO,
				CMS_R_CIPHER_INITIALISATION_ERROR);
		goto err;
		}

	if (EVP_CIPHER_asn1_to_param(ctx, 
			ec->contentEncryptionAlgorithm->parameter) <= 0)
			{
			CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO,
				CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
			goto err;
			}
	return b;

	err:
	BIO_free(b);
	return NULL;
	}