crypto/pkcs7/pk7_doit.c

/* crypto/pkcs7/pk7_doit.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/rand.h>
#include <openssl/objects.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include <openssl/err.h>

static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
			 void *value);
static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid);

static int PKCS7_type_is_other(PKCS7* p7)
	{
	int isOther=1;

	int nid=OBJ_obj2nid(p7->type);

	switch( nid )
		{
	case NID_pkcs7_data:
	case NID_pkcs7_signed:
	case NID_pkcs7_enveloped:
	case NID_pkcs7_signedAndEnveloped:
	case NID_pkcs7_digest:
	case NID_pkcs7_encrypted:
		isOther=0;
		break;
	default:
		isOther=1;
		}

	return isOther;

	}

static ASN1_OCTET_STRING *PKCS7_get_octet_string(PKCS7 *p7)
	{
	if ( PKCS7_type_is_data(p7))
		return p7->d.data;
	if ( PKCS7_type_is_other(p7) && p7->d.other
		&& (p7->d.other->type == V_ASN1_OCTET_STRING))
		return p7->d.other->value.octet_string;
	return NULL;
	}

static int PKCS7_bio_add_digest(BIO **pbio, X509_ALGOR *alg)
	{
	BIO *btmp;
	const EVP_MD *md;
	if ((btmp=BIO_new(BIO_f_md())) == NULL)
		{
		PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,ERR_R_BIO_LIB);
		goto err;
		}

	md=EVP_get_digestbyobj(alg->algorithm);
	if (md == NULL)
		{
		PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,PKCS7_R_UNKNOWN_DIGEST_TYPE);
		goto err;
		}

	BIO_set_md(btmp,md);
	if (*pbio == NULL)
		*pbio=btmp;
	else if (!BIO_push(*pbio,btmp))
		{
		PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,ERR_R_BIO_LIB);
		goto err;
		}
	btmp=NULL;

	return 1;

	err:
	if (btmp)
		BIO_free(btmp);
	return 0;

	}

static int pkcs7_encode_rinfo(PKCS7_RECIP_INFO *ri,
					unsigned char *key, int keylen)
	{
	EVP_PKEY_CTX *pctx = NULL;
	EVP_PKEY *pkey = NULL;
	unsigned char *ek = NULL;
	int ret = 0;
	size_t eklen;

	pkey = X509_get_pubkey(ri->cert);

	if (!pkey)
		return 0;

	pctx = EVP_PKEY_CTX_new(pkey, NULL);
	if (!pctx)
		return 0;

	if (EVP_PKEY_encrypt_init(pctx) <= 0)
		goto err;

	if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
				EVP_PKEY_CTRL_PKCS7_ENCRYPT, 0, ri) <= 0)
		{
		PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, PKCS7_R_CTRL_ERROR);
		goto err;
		}

	if (EVP_PKEY_encrypt(pctx, NULL, &eklen, key, keylen) <= 0)
		goto err;

	ek = OPENSSL_malloc(eklen);

	if (ek == NULL)
		{
		PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, ERR_R_MALLOC_FAILURE);
		goto err;
		}

	if (EVP_PKEY_encrypt(pctx, ek, &eklen, key, keylen) <= 0)
		goto err;

	ASN1_STRING_set0(ri->enc_key, ek, eklen);
	ek = NULL;

	ret = 1;

	err:
	if (pkey)
		EVP_PKEY_free(pkey);
	if (pctx)
		EVP_PKEY_CTX_free(pctx);
	if (ek)
		OPENSSL_free(ek);
	return ret;

	}


static int pkcs7_decrypt_rinfo(unsigned char **pek, int *peklen,
			       PKCS7_RECIP_INFO *ri, EVP_PKEY *pkey)
	{
	EVP_PKEY_CTX *pctx = NULL;
	unsigned char *ek = NULL;
	size_t eklen;

	int ret = -1;

	pctx = EVP_PKEY_CTX_new(pkey, NULL);
	if (!pctx)
		return -1;

	if (EVP_PKEY_decrypt_init(pctx) <= 0)
		goto err;

	if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DECRYPT,
				EVP_PKEY_CTRL_PKCS7_DECRYPT, 0, ri) <= 0)
		{
		PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, PKCS7_R_CTRL_ERROR);
		goto err;
		}

	if (EVP_PKEY_decrypt(pctx, NULL, &eklen,
				ri->enc_key->data, ri->enc_key->length) <= 0)
		goto err;

	ek = OPENSSL_malloc(eklen);

	if (ek == NULL)
		{
		PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_MALLOC_FAILURE);
		goto err;
		}

	if (EVP_PKEY_decrypt(pctx, ek, &eklen,
				ri->enc_key->data, ri->enc_key->length) <= 0)
		{
		ret = 0;
		PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_EVP_LIB);
		goto err;
		}

	ret = 1;

	if (*pek)
		{
		OPENSSL_cleanse(*pek, *peklen);
		OPENSSL_free(*pek);
		}

	*pek = ek;
	*peklen = eklen;

	err:
	if (pctx)
		EVP_PKEY_CTX_free(pctx);
	if (!ret && ek)
		OPENSSL_free(ek);

	return ret;
	}

BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
	{
	int i;
	BIO *out=NULL,*btmp=NULL;
	X509_ALGOR *xa = NULL;
	const EVP_CIPHER *evp_cipher=NULL;
	STACK_OF(X509_ALGOR) *md_sk=NULL;
	STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
	X509_ALGOR *xalg=NULL;
	PKCS7_RECIP_INFO *ri=NULL;
	ASN1_OCTET_STRING *os=NULL;

	if (p7 == NULL) {
		PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_INVALID_NULL_POINTER);
		return NULL;
	}
	/*
	 * The content field in the PKCS7 ContentInfo is optional, but that really
	 * only applies to inner content (precisely, detached signatures).
	 *
	 * When reading content, missing outer content is therefore treated as an
	 * error.
	 *
	 * When creating content, PKCS7_content_new() must be called before
	 * calling this method, so a NULL p7->d is always an error.
	 */
	if (p7->d.ptr == NULL) {
		PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_NO_CONTENT);
		return NULL;
	}

	i=OBJ_obj2nid(p7->type);
	p7->state=PKCS7_S_HEADER;

	switch (i)
		{
	case NID_pkcs7_signed:
		md_sk=p7->d.sign->md_algs;
		os = PKCS7_get_octet_string(p7->d.sign->contents);
		break;
	case NID_pkcs7_signedAndEnveloped:
		rsk=p7->d.signed_and_enveloped->recipientinfo;
		md_sk=p7->d.signed_and_enveloped->md_algs;
		xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
		evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
		if (evp_cipher == NULL)
			{
			PKCS7err(PKCS7_F_PKCS7_DATAINIT,
						PKCS7_R_CIPHER_NOT_INITIALIZED);
			goto err;
			}
		break;
	case NID_pkcs7_enveloped:
		rsk=p7->d.enveloped->recipientinfo;
		xalg=p7->d.enveloped->enc_data->algorithm;
		evp_cipher=p7->d.enveloped->enc_data->cipher;
		if (evp_cipher == NULL)
			{
			PKCS7err(PKCS7_F_PKCS7_DATAINIT,
						PKCS7_R_CIPHER_NOT_INITIALIZED);
			goto err;
			}
		break;
	case NID_pkcs7_digest:
		xa = p7->d.digest->md;
		os = PKCS7_get_octet_string(p7->d.digest->contents);
		break;
	case NID_pkcs7_data:
		break;
	default:
		PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
	        goto err;
		}

	for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
		if (!PKCS7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i)))
			goto err;

	if (xa && !PKCS7_bio_add_digest(&out, xa))
			goto err;

	if (evp_cipher != NULL)
		{
		unsigned char key[EVP_MAX_KEY_LENGTH];
		unsigned char iv[EVP_MAX_IV_LENGTH];
		int keylen,ivlen;
		EVP_CIPHER_CTX *ctx;

		if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
			{
			PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
			goto err;
			}
		BIO_get_cipher_ctx(btmp, &ctx);
		keylen=EVP_CIPHER_key_length(evp_cipher);
		ivlen=EVP_CIPHER_iv_length(evp_cipher);
		xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
		if (ivlen > 0)
			if (RAND_pseudo_bytes(iv,ivlen) <= 0)
				goto err;
		if (EVP_CipherInit_ex(ctx, evp_cipher, NULL, NULL, NULL, 1)<=0)
			goto err;
		if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
			goto err;
		if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
			goto err;

		if (ivlen > 0) {
			if (xalg->parameter == NULL) {
				xalg->parameter = ASN1_TYPE_new();
				if (xalg->parameter == NULL)
					goto err;
			}
			if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
				goto err;
		}

		/* Lets do the pub key stuff :-) */
		for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
			{
			ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
			if (pkcs7_encode_rinfo(ri, key, keylen) <= 0)
				goto err;
			}
		OPENSSL_cleanse(key, keylen);

		if (out == NULL)
			out=btmp;
		else
			BIO_push(out,btmp);
		btmp=NULL;
		}

	if (bio == NULL)
		{
		if (PKCS7_is_detached(p7))
			bio=BIO_new(BIO_s_null());
		else if (os && os->length > 0)
			bio = BIO_new_mem_buf(os->data, os->length);
		if(bio == NULL)
			{
			bio=BIO_new(BIO_s_mem());
			if (bio == NULL)
				goto err;
			BIO_set_mem_eof_return(bio,0);
			}
		}
	if (out)
		BIO_push(out,bio);
	else
		out = bio;
	bio=NULL;
	if (0)
		{
err:
		if (out != NULL)
			BIO_free_all(out);
		if (btmp != NULL)
			BIO_free_all(btmp);
		out=NULL;
		}
	return(out);
	}

static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
	{
	int ret;
	ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
				pcert->cert_info->issuer);
	if (ret)
		return ret;
	return M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
					ri->issuer_and_serial->serial);
	}

/* int */
BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
	{
	int i,j;
	BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
	X509_ALGOR *xa;
	ASN1_OCTET_STRING *data_body=NULL;
	const EVP_MD *evp_md;
	const EVP_CIPHER *evp_cipher=NULL;
	EVP_CIPHER_CTX *evp_ctx=NULL;
	X509_ALGOR *enc_alg=NULL;
	STACK_OF(X509_ALGOR) *md_sk=NULL;
	STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
	PKCS7_RECIP_INFO *ri=NULL;
       unsigned char *ek = NULL, *tkey = NULL;
       int eklen = 0, tkeylen = 0;

	if (p7 == NULL) {
		PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_INVALID_NULL_POINTER);
		return NULL;
	}

	if (p7->d.ptr == NULL) {
		PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
		return NULL;
	}

	i=OBJ_obj2nid(p7->type);
	p7->state=PKCS7_S_HEADER;

	switch (i)
		{
	case NID_pkcs7_signed:
		data_body=PKCS7_get_octet_string(p7->d.sign->contents);
		if (!PKCS7_is_detached(p7) && data_body == NULL)
			{
			PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_INVALID_SIGNED_DATA_TYPE);
			goto err;
			}
		md_sk=p7->d.sign->md_algs;
		break;
	case NID_pkcs7_signedAndEnveloped:
		rsk=p7->d.signed_and_enveloped->recipientinfo;
		md_sk=p7->d.signed_and_enveloped->md_algs;
		data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
		enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
		evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
		if (evp_cipher == NULL)
			{
			PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
			goto err;
			}
		break;
	case NID_pkcs7_enveloped:
		rsk=p7->d.enveloped->recipientinfo;
		enc_alg=p7->d.enveloped->enc_data->algorithm;
		data_body=p7->d.enveloped->enc_data->enc_data;
		evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
		if (evp_cipher == NULL)
			{
			PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
			goto err;
			}
		break;
	default:
		PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
	        goto err;
		}

    /* Detached content must be supplied via in_bio instead. */
    if (data_body == NULL && in_bio == NULL) {
        PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
        goto err;
    }

	/* We will be checking the signature */
	if (md_sk != NULL)
		{
		for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
			{
			xa=sk_X509_ALGOR_value(md_sk,i);
			if ((btmp=BIO_new(BIO_f_md())) == NULL)
				{
				PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
				goto err;
				}

			j=OBJ_obj2nid(xa->algorithm);
			evp_md=EVP_get_digestbynid(j);
			if (evp_md == NULL)
				{
				PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
				goto err;
				}

			BIO_set_md(btmp,evp_md);
			if (out == NULL)
				out=btmp;
			else
				BIO_push(out,btmp);
			btmp=NULL;
			}
		}

	if (evp_cipher != NULL)
		{
#if 0
		unsigned char key[EVP_MAX_KEY_LENGTH];
		unsigned char iv[EVP_MAX_IV_LENGTH];
		unsigned char *p;
		int keylen,ivlen;
		int max;
		X509_OBJECT ret;
#endif

		if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
			{
			PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
			goto err;
			}

		/* It was encrypted, we need to decrypt the secret key
		 * with the private key */

		/* Find the recipientInfo which matches the passed certificate
		 * (if any)
		 */

		if (pcert)
			{
			for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
				{
				ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
				if (!pkcs7_cmp_ri(ri, pcert))
					break;
				ri=NULL;
				}
			if (ri == NULL)
				{
				PKCS7err(PKCS7_F_PKCS7_DATADECODE,
				      PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
				goto err;
				}
			}

		/* If we haven't got a certificate try each ri in turn */
		if (pcert == NULL)
			{
			/* Always attempt to decrypt all rinfo even
			 * after sucess as a defence against MMA timing
			 * attacks.
			 */
			for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
				{
				ri=sk_PKCS7_RECIP_INFO_value(rsk,i);

				if (pkcs7_decrypt_rinfo(&ek, &eklen,
							ri, pkey) < 0)
					goto err;
				ERR_clear_error();
				}
			}
		else
			{
			/* Only exit on fatal errors, not decrypt failure */
			if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey) < 0)
				goto err;
			ERR_clear_error();
			}

		evp_ctx=NULL;
		BIO_get_cipher_ctx(etmp,&evp_ctx);
		if (EVP_CipherInit_ex(evp_ctx,evp_cipher,NULL,NULL,NULL,0) <= 0)
			goto err;
		if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
			goto err;
		/* Generate random key as MMA defence */
		tkeylen = EVP_CIPHER_CTX_key_length(evp_ctx);
		tkey = OPENSSL_malloc(tkeylen);
		if (!tkey)
			goto err;
		if (EVP_CIPHER_CTX_rand_key(evp_ctx, tkey) <= 0)
			goto err;
		if (ek == NULL)
			{
			ek = tkey;
			eklen = tkeylen;
			tkey = NULL;
			}

		if (eklen != EVP_CIPHER_CTX_key_length(evp_ctx)) {
			/* Some S/MIME clients don't use the same key
			 * and effective key length. The key length is
			 * determined by the size of the decrypted RSA key.
			 */
			if(!EVP_CIPHER_CTX_set_key_length(evp_ctx, eklen))
				{
				/* Use random key as MMA defence */
				OPENSSL_cleanse(ek, eklen);
				OPENSSL_free(ek);
				ek = tkey;
				eklen = tkeylen;
				tkey = NULL;
				}
		}
		/* Clear errors so we don't leak information useful in MMA */
		ERR_clear_error();
		if (EVP_CipherInit_ex(evp_ctx,NULL,NULL,ek,NULL,0) <= 0)
			goto err;

		if (ek)
			{
			OPENSSL_cleanse(ek,eklen);
			OPENSSL_free(ek);
                       ek = NULL;
			}
		if (tkey)
			{
			OPENSSL_cleanse(tkey,tkeylen);
			OPENSSL_free(tkey);
                       tkey = NULL;
			}

		if (out == NULL)
			out=etmp;
		else
			BIO_push(out,etmp);
		etmp=NULL;
		}

#if 1
	if (in_bio != NULL)
		{
		bio=in_bio;
		}
	else
		{
#if 0
		bio=BIO_new(BIO_s_mem());
		/* We need to set this so that when we have read all
		 * the data, the encrypt BIO, if present, will read
		 * EOF and encode the last few bytes */
		BIO_set_mem_eof_return(bio,0);

		if (data_body->length > 0)
			BIO_write(bio,(char *)data_body->data,data_body->length);
#else
		if (data_body->length > 0)
		      bio = BIO_new_mem_buf(data_body->data,data_body->length);
		else {
			bio=BIO_new(BIO_s_mem());
			BIO_set_mem_eof_return(bio,0);
		}
		if (bio == NULL)
			goto err;
#endif
		}
	BIO_push(out,bio);
	bio=NULL;
#endif
	if (0)
		{
err:
               if (ek)
                       {
                       OPENSSL_cleanse(ek,eklen);
                       OPENSSL_free(ek);
                       }
               if (tkey)
                       {
                       OPENSSL_cleanse(tkey,tkeylen);
                       OPENSSL_free(tkey);
                       }
		if (out != NULL) BIO_free_all(out);
		if (btmp != NULL) BIO_free_all(btmp);
		if (etmp != NULL) BIO_free_all(etmp);
		if (bio != NULL) BIO_free_all(bio);
		out=NULL;
		}
	return(out);
	}

static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
	{
	for (;;)
		{
		bio=BIO_find_type(bio,BIO_TYPE_MD);
		if (bio == NULL)
			{
			PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
			return NULL;
			}
		BIO_get_md_ctx(bio,pmd);
		if (*pmd == NULL)
			{
			PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,ERR_R_INTERNAL_ERROR);
			return NULL;
			}
		if (EVP_MD_CTX_type(*pmd) == nid)
			return bio;
		bio=BIO_next(bio);
		}
	return NULL;
	}

static int do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO *si, EVP_MD_CTX *mctx)
	{
	unsigned char md_data[EVP_MAX_MD_SIZE];
	unsigned int md_len;

	/* Add signing time if not already present */
	if (!PKCS7_get_signed_attribute(si, NID_pkcs9_signingTime))
		{
		if (!PKCS7_add0_attrib_signing_time(si, NULL))
			{
			PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB,
					ERR_R_MALLOC_FAILURE);
			return 0;
			}
		}

	/* Add digest */
	if (!EVP_DigestFinal_ex(mctx, md_data,&md_len))
		{
		PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_EVP_LIB);
		return 0;
		}
	if (!PKCS7_add1_attrib_digest(si, md_data, md_len))
		{
		PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
		return 0;
		}

	/* Now sign the attributes */
	if (!PKCS7_SIGNER_INFO_sign(si))
			return 0;

	return 1;
	}


int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
	{
	int ret=0;
	int i,j;
	BIO *btmp;
	PKCS7_SIGNER_INFO *si;
	EVP_MD_CTX *mdc,ctx_tmp;
	STACK_OF(X509_ATTRIBUTE) *sk;
	STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
	ASN1_OCTET_STRING *os=NULL;

	if (p7 == NULL) {
		PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_INVALID_NULL_POINTER);
		return 0;
	}

	if (p7->d.ptr == NULL) {
		PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_NO_CONTENT);
		return 0;
	}

	EVP_MD_CTX_init(&ctx_tmp);
	i=OBJ_obj2nid(p7->type);
	p7->state=PKCS7_S_HEADER;

	switch (i)
		{
	case NID_pkcs7_data:
		os = p7->d.data;
		break;
	case NID_pkcs7_signedAndEnveloped:
		/* XXXXXXXXXXXXXXXX */
		si_sk=p7->d.signed_and_enveloped->signer_info;
		os = p7->d.signed_and_enveloped->enc_data->enc_data;
		if (!os)
			{
			os=M_ASN1_OCTET_STRING_new();
			if (!os)
				{
				PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
				goto err;
				}
			p7->d.signed_and_enveloped->enc_data->enc_data=os;
			}
		break;
	case NID_pkcs7_enveloped:
		/* XXXXXXXXXXXXXXXX */
		os = p7->d.enveloped->enc_data->enc_data;
		if (!os)
			{
			os=M_ASN1_OCTET_STRING_new();
			if (!os)
				{
				PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
				goto err;
				}
			p7->d.enveloped->enc_data->enc_data=os;
			}
		break;
	case NID_pkcs7_signed:
		si_sk=p7->d.sign->signer_info;
		os=PKCS7_get_octet_string(p7->d.sign->contents);
		/* If detached data then the content is excluded */
		if(PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
			M_ASN1_OCTET_STRING_free(os);
			os = NULL;
			p7->d.sign->contents->d.data = NULL;
		}
		break;

	case NID_pkcs7_digest:
		os=PKCS7_get_octet_string(p7->d.digest->contents);
		/* If detached data then the content is excluded */
		if(PKCS7_type_is_data(p7->d.digest->contents) && p7->detached)
			{
			M_ASN1_OCTET_STRING_free(os);
			os = NULL;
			p7->d.digest->contents->d.data = NULL;
			}
		break;

	default:
		PKCS7err(PKCS7_F_PKCS7_DATAFINAL,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
	        goto err;
		}

	if (si_sk != NULL)
		{
		for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
			{
			si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
			if (si->pkey == NULL)
				continue;

			j = OBJ_obj2nid(si->digest_alg->algorithm);

			btmp=bio;

			btmp = PKCS7_find_digest(&mdc, btmp, j);

			if (btmp == NULL)
				goto err;

			/* We now have the EVP_MD_CTX, lets do the
			 * signing. */
			if (!EVP_MD_CTX_copy_ex(&ctx_tmp,mdc))
				goto err;

			sk=si->auth_attr;

			/* If there are attributes, we add the digest
			 * attribute and only sign the attributes */
			if (sk_X509_ATTRIBUTE_num(sk) > 0)
				{
				if (!do_pkcs7_signed_attrib(si, &ctx_tmp))
					goto err;
				}
			else
				{
				unsigned char *abuf = NULL;
				unsigned int abuflen;
				abuflen = EVP_PKEY_size(si->pkey);
				abuf = OPENSSL_malloc(abuflen);
				if (!abuf)
					goto err;

				if (!EVP_SignFinal(&ctx_tmp, abuf, &abuflen,
							si->pkey))
					{
					PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
							ERR_R_EVP_LIB);
					goto err;
					}
				ASN1_STRING_set0(si->enc_digest, abuf, abuflen);
				}
			}
		}
	else if (i == NID_pkcs7_digest) {
		unsigned char md_data[EVP_MAX_MD_SIZE];
		unsigned int md_len;
		if (!PKCS7_find_digest(&mdc, bio,
				OBJ_obj2nid(p7->d.digest->md->algorithm)))
			goto err;
		if (!EVP_DigestFinal_ex(mdc,md_data,&md_len))
			goto err;
		M_ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len);
		}

		if (!PKCS7_is_detached(p7)) {
			/*
			 * NOTE(emilia): I think we only reach os == NULL here because detached
			 * digested data support is broken.
			 */
			if (os == NULL)
				goto err;
			if (!(os->flags & ASN1_STRING_FLAG_NDEF)) {
				char *cont;
				long contlen;
				btmp = BIO_find_type(bio, BIO_TYPE_MEM);
				if (btmp == NULL) {
					PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
				goto err;
			}
			contlen = BIO_get_mem_data(btmp, &cont);
			/*
			 * Mark the BIO read only then we can use its copy of the data
			 * instead of making an extra copy.
			 */
			BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
			BIO_set_mem_eof_return(btmp, 0);
			ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
		}
	}
	ret=1;
err:
	EVP_MD_CTX_cleanup(&ctx_tmp);
	return(ret);
	}

int PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO *si)
	{
	EVP_MD_CTX mctx;
	EVP_PKEY_CTX *pctx;
	unsigned char *abuf = NULL;
	int alen;
	size_t siglen;
	const EVP_MD *md = NULL;

	md = EVP_get_digestbyobj(si->digest_alg->algorithm);
	if (md == NULL)
		return 0;

	EVP_MD_CTX_init(&mctx);
	if (EVP_DigestSignInit(&mctx, &pctx, md,NULL, si->pkey) <= 0)
		goto err;

	if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
				EVP_PKEY_CTRL_PKCS7_SIGN, 0, si) <= 0)
		{
		PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
		goto err;
		}

	alen = ASN1_item_i2d((ASN1_VALUE *)si->auth_attr,&abuf,
				ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
	if(!abuf)
		goto err;
	if (EVP_DigestSignUpdate(&mctx,abuf,alen) <= 0)
		goto err;
	OPENSSL_free(abuf);
	abuf = NULL;
	if (EVP_DigestSignFinal(&mctx, NULL, &siglen) <= 0)
		goto err;
	abuf = OPENSSL_malloc(siglen);
	if(!abuf)
		goto err;
	if (EVP_DigestSignFinal(&mctx, abuf, &siglen) <= 0)
		goto err;

	if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
				EVP_PKEY_CTRL_PKCS7_SIGN, 1, si) <= 0)
		{
		PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
		goto err;
		}

	EVP_MD_CTX_cleanup(&mctx);

	ASN1_STRING_set0(si->enc_digest, abuf, siglen);

	return 1;

	err:
	if (abuf)
		OPENSSL_free(abuf);
	EVP_MD_CTX_cleanup(&mctx);
	return 0;

	}

int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
	     PKCS7 *p7, PKCS7_SIGNER_INFO *si)
	{
	PKCS7_ISSUER_AND_SERIAL *ias;
	int ret=0,i;
	STACK_OF(X509) *cert;
	X509 *x509;

	if (p7 == NULL) {
		PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_INVALID_NULL_POINTER);
		return 0;
	}

	if (p7->d.ptr == NULL) {
		PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_NO_CONTENT);
		return 0;
	}

	if (PKCS7_type_is_signed(p7))
		{
		cert=p7->d.sign->cert;
		}
	else if (PKCS7_type_is_signedAndEnveloped(p7))
		{
		cert=p7->d.signed_and_enveloped->cert;
		}
	else
		{
		PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
		goto err;
		}
	/* XXXXXXXXXXXXXXXXXXXXXXX */
	ias=si->issuer_and_serial;

	x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);

	/* were we able to find the cert in passed to us */
	if (x509 == NULL)
		{
		PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
		goto err;
		}

	/* Lets verify */
	if(!X509_STORE_CTX_init(ctx,cert_store,x509,cert))
		{
		PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
		goto err;
		}
	X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
	i=X509_verify_cert(ctx);
	if (i <= 0)
		{
		PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
		X509_STORE_CTX_cleanup(ctx);
		goto err;
		}
	X509_STORE_CTX_cleanup(ctx);

	return PKCS7_signatureVerify(bio, p7, si, x509);
	err:
	return ret;
	}

int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
								X509 *x509)
	{
	ASN1_OCTET_STRING *os;
	EVP_MD_CTX mdc_tmp,*mdc;
	int ret=0,i;
	int md_type;
	STACK_OF(X509_ATTRIBUTE) *sk;
	BIO *btmp;
	EVP_PKEY *pkey;

	EVP_MD_CTX_init(&mdc_tmp);

	if (!PKCS7_type_is_signed(p7) &&
				!PKCS7_type_is_signedAndEnveloped(p7)) {
		PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
						PKCS7_R_WRONG_PKCS7_TYPE);
		goto err;
	}

	md_type=OBJ_obj2nid(si->digest_alg->algorithm);

	btmp=bio;
	for (;;)
		{
		if ((btmp == NULL) ||
			((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
			{
			PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
					PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
			goto err;
			}
		BIO_get_md_ctx(btmp,&mdc);
		if (mdc == NULL)
			{
			PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
							ERR_R_INTERNAL_ERROR);
			goto err;
			}
		if (EVP_MD_CTX_type(mdc) == md_type)
			break;
		/* Workaround for some broken clients that put the signature
		 * OID instead of the digest OID in digest_alg->algorithm
		 */
		if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
			break;
		btmp=BIO_next(btmp);
		}

	/* mdc is the digest ctx that we want, unless there are attributes,
	 * in which case the digest is the signed attributes */
	if (!EVP_MD_CTX_copy_ex(&mdc_tmp,mdc))
		goto err;

	sk=si->auth_attr;
	if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
		{
		unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
                unsigned int md_len;
		int alen;
		ASN1_OCTET_STRING *message_digest;

		if (!EVP_DigestFinal_ex(&mdc_tmp,md_dat,&md_len))
			goto err;
		message_digest=PKCS7_digest_from_attributes(sk);
		if (!message_digest)
			{
			PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
					PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
			goto err;
			}
		if ((message_digest->length != (int)md_len) ||
			(memcmp(message_digest->data,md_dat,md_len)))
			{
#if 0
{
int ii;
for (ii=0; ii<message_digest->length; ii++)
	printf("%02X",message_digest->data[ii]); printf(" sent\n");
for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
}
#endif
			PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
							PKCS7_R_DIGEST_FAILURE);
			ret= -1;
			goto err;
			}

		if (!EVP_VerifyInit_ex(&mdc_tmp,EVP_get_digestbynid(md_type), NULL))
			goto err;

		alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
						ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
		if (alen <= 0)
			{
			PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,ERR_R_ASN1_LIB);
			ret = -1;
			goto err;
			}
		if (!EVP_VerifyUpdate(&mdc_tmp, abuf, alen))
			goto err;

		OPENSSL_free(abuf);
		}

	os=si->enc_digest;
	pkey = X509_get_pubkey(x509);
	if (!pkey)
		{
		ret = -1;
		goto err;
		}

	i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
	EVP_PKEY_free(pkey);
	if (i <= 0)
		{
		PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
						PKCS7_R_SIGNATURE_FAILURE);
		ret= -1;
		goto err;
		}
	else
		ret=1;
err:
	EVP_MD_CTX_cleanup(&mdc_tmp);
	return(ret);
	}

PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
	{
	STACK_OF(PKCS7_RECIP_INFO) *rsk;
	PKCS7_RECIP_INFO *ri;
	int i;

	i=OBJ_obj2nid(p7->type);
	if (i != NID_pkcs7_signedAndEnveloped)
		return NULL;
	if (p7->d.signed_and_enveloped == NULL)
		return NULL;
	rsk=p7->d.signed_and_enveloped->recipientinfo;
	if (rsk == NULL)
		return NULL;
	ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
	if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
	ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
	return(ri->issuer_and_serial);
	}

ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
	{
	return(get_attribute(si->auth_attr,nid));
	}

ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
	{
	return(get_attribute(si->unauth_attr,nid));
	}

static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
	{
	int i;
	X509_ATTRIBUTE *xa;
	ASN1_OBJECT *o;

	o=OBJ_nid2obj(nid);
	if (!o || !sk) return(NULL);
	for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
		{
		xa=sk_X509_ATTRIBUTE_value(sk,i);
		if (OBJ_cmp(xa->object,o) == 0)
			{
			if (!xa->single && sk_ASN1_TYPE_num(xa->value.set))
				return(sk_ASN1_TYPE_value(xa->value.set,0));
			else
				return(NULL);
			}
		}
	return(NULL);
	}

ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
{
	ASN1_TYPE *astype;
	if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
	return astype->value.octet_string;
}

int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
				STACK_OF(X509_ATTRIBUTE) *sk)
	{
	int i;

	if (p7si->auth_attr != NULL)
		sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
	p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
	if (p7si->auth_attr == NULL)
		return 0;
	for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
		{
		if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
			X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
		    == NULL)
			return(0);
		}
	return(1);
	}

int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
	{
	int i;

	if (p7si->unauth_attr != NULL)
		sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
					   X509_ATTRIBUTE_free);
	p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
	if (p7si->unauth_attr == NULL)
		return 0;
	for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
		{
		if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
                        X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
		    == NULL)
			return(0);
		}
	return(1);
	}

int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
	     void *value)
	{
	return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
	}

int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
	     void *value)
	{
	return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
	}

static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
			 void *value)
	{
	X509_ATTRIBUTE *attr=NULL;

	if (*sk == NULL)
		{
		*sk = sk_X509_ATTRIBUTE_new_null();
		if (*sk == NULL)
			return 0;
new_attrib:
		if (!(attr=X509_ATTRIBUTE_create(nid,atrtype,value)))
			return 0;
		if (!sk_X509_ATTRIBUTE_push(*sk,attr))
			{
			X509_ATTRIBUTE_free(attr);
			return 0;
			}
		}
	else
		{
		int i;

		for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
			{
			attr=sk_X509_ATTRIBUTE_value(*sk,i);
			if (OBJ_obj2nid(attr->object) == nid)
				{
				X509_ATTRIBUTE_free(attr);
				attr=X509_ATTRIBUTE_create(nid,atrtype,value);
				if (attr == NULL)
					return 0;
				if (!sk_X509_ATTRIBUTE_set(*sk,i,attr))
					{
					X509_ATTRIBUTE_free(attr);
					return 0;
					}
				goto end;
				}
			}
		goto new_attrib;
		}
end:
	return(1);
	}