pk7_doit.c

openssl是ssl的开源项目

/* crypto/pkcs7/pk7_doit.c */
/* Copyright (C) 1995-1998 Eric Young ([e-mail])
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young ([e-mail]).
 * 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 ([e-mail]).
 * 
 * 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 ([e-mail])"
 *    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 ([e-mail])"
 * 
 * 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 "rand.h"
#include "objects.h"
#include "x509.h"

static int add_attribute(STACK **sk, int nid, int atrtype, char *value);
static ASN1_TYPE *get_attribute(STACK *sk, int nid);

#if 1
BIO *PKCS7_dataInit(p7,bio)
PKCS7 *p7;
BIO *bio;
	{
	int i,j;
	BIO *out=NULL,*btmp=NULL;
	X509_ALGOR *xa;
	EVP_MD *evp_md;
	EVP_CIPHER *evp_cipher=NULL;
	STACK *md_sk=NULL,*rsk=NULL;
	X509_ALGOR *xalg=NULL;
	PKCS7_RECIP_INFO *ri=NULL;
	EVP_PKEY *pkey;

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

	switch (i)
		{
	case NID_pkcs7_signed:
		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;
		evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(p7->d.signed_and_enveloped->enc_data->algorithm->algorithm)));
		if (evp_cipher == NULL)
			{
			PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
			goto err;
			}
		xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
		break;
	case NID_pkcs7_enveloped:
		rsk=p7->d.enveloped->recipientinfo;
		evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(p7->d.enveloped->enc_data->algorithm->algorithm)));
		if (evp_cipher == NULL)
			{
			PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
			goto err;
			}
		xalg=p7->d.enveloped->enc_data->algorithm;
		break;
	default:
		PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
	        goto err;
		}

	if (md_sk != NULL)
		{
		for (i=0; i<sk_num(md_sk); i++)
			{
			xa=(X509_ALGOR *)sk_value(md_sk,i);
			if ((btmp=BIO_new(BIO_f_md())) == NULL)
				{
				PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
				goto err;
				}

			j=OBJ_obj2nid(xa->algorithm);
			evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
			if (evp_md == NULL)
				{
				PKCS7err(PKCS7_F_PKCS7_DATAINIT,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)
		{
		unsigned char key[EVP_MAX_KEY_LENGTH];
		unsigned char iv[EVP_MAX_IV_LENGTH];
		int keylen,ivlen;
		int jj,max;
		unsigned char *tmp;

		if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
			{
			PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
			goto err;
			}
		keylen=EVP_CIPHER_key_length(evp_cipher);
		ivlen=EVP_CIPHER_iv_length(evp_cipher);

		if (ivlen > 0)
			{
			ASN1_OCTET_STRING *os;

			RAND_bytes(iv,ivlen);
			os=ASN1_OCTET_STRING_new();
			ASN1_OCTET_STRING_set(os,iv,ivlen);
/* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX this needs to change */
			if (xalg->parameter == NULL)
				xalg->parameter=ASN1_TYPE_new();
			ASN1_TYPE_set(xalg->parameter,V_ASN1_OCTET_STRING,
				(char *)os);
			}
		RAND_bytes(key,keylen);

		/* Lets do the pub key stuff :-) */
		max=0;
		for (i=0; i<sk_num(rsk); i++)
			{
			ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
			if (ri->cert == NULL)
				{
				PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO);
				goto err;
				}
			pkey=X509_get_pubkey(ri->cert);
			jj=EVP_PKEY_size(pkey);
			if (max < jj) max=jj;
			}
		if ((tmp=(unsigned char *)Malloc(max)) == NULL)
			{
			PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE);
			goto err;
			}
		for (i=0; i<sk_num(rsk); i++)
			{
			ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
			pkey=X509_get_pubkey(ri->cert);
			jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
			if (jj <= 0)
				{
				PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB);
				Free(tmp);
				goto err;
				}
			ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj);
			}
		Free(tmp);

		BIO_set_cipher(btmp,evp_cipher,key,iv,1);

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

	if (bio == NULL) /* ??????????? */
		{
		if (p7->detached)
			bio=BIO_new(BIO_s_null());
		else
			{
			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 (PKCS7_type_is_signed(p7) &&
				PKCS7_type_is_data(p7->d.sign->contents))
				{
				ASN1_OCTET_STRING *os;

				os=p7->d.sign->contents->d.data;
				if (os->length > 0)
					BIO_write(bio,(char *)os->data,
						os->length);
				}
			}
		}
	BIO_push(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);
	}

/* int */
BIO *PKCS7_dataDecode(p7,pkey,in_bio,xs)
PKCS7 *p7;
EVP_PKEY *pkey;
BIO *in_bio;
X509_STORE *xs;
	{
	int i,j;
	BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
	char *tmp=NULL;
	X509_ALGOR *xa;
	ASN1_OCTET_STRING *data_body=NULL;
	EVP_MD *evp_md;
	EVP_CIPHER *evp_cipher=NULL;
	EVP_CIPHER_CTX *evp_ctx=NULL;
	X509_ALGOR *enc_alg=NULL;
	STACK *md_sk=NULL,*rsk=NULL;
	X509_ALGOR *xalg=NULL;
	PKCS7_RECIP_INFO *ri=NULL;
/*	EVP_PKEY *pkey; */
#if 0
	X509_STORE_CTX s_ctx;
#endif

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

	switch (i)
		{
	case NID_pkcs7_signed:
		data_body=p7->d.sign->contents->d.data;
		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_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
		if (evp_cipher == NULL)
			{
			PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
			goto err;
			}
		xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
		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_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
		if (evp_cipher == NULL)
			{
			PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
			goto err;
			}
		xalg=p7->d.enveloped->enc_data->algorithm;
		break;
	default:
		PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
	        goto err;
		}

	/* We will be checking the signature */
	if (md_sk != NULL)
		{
		for (i=0; i<sk_num(md_sk); i++)
			{
			xa=(X509_ALGOR *)sk_value(md_sk,i);
			if ((btmp=BIO_new(BIO_f_md())) == NULL)
				{
				PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_BIO_LIB);
				goto err;
				}

			j=OBJ_obj2nid(xa->algorithm);
			evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
			if (evp_md == NULL)
				{
				PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,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
		int jj;

		if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
			{
			PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_BIO_LIB);
			goto err;
			}

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

		/* We need to find a private key for one of the people in the
		 * recipentinfo list */
		if (rsk == NULL)
			return(NULL);

		ri=(PKCS7_RECIP_INFO *)sk_value(rsk,0);
#if 0
		X509_STORE_CTX_init(&s_ctx,xs,NULL,NULL);
		for (i=0; i<sk_num(rsk); i++)
			{
			ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
			uf (X509_STORE_get_by_issuer_serial(&s_ctx,
				X509_LU_PKEY,
				ri->issuer_and_serial->issuer,
				ri->issuer_and_serial->serial,
				&ret))
				break;
			ri=NULL;
			}
		if (ri == NULL) return(NULL);	
		pkey=ret.data.pkey;
#endif
		if (pkey == NULL)
			{
			return(NULL);
			}

		jj=EVP_PKEY_size(pkey);
		tmp=Malloc(jj+10);
		if (tmp == NULL)
			{
			PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_MALLOC_FAILURE);
			goto err;
			}

		jj=EVP_PKEY_decrypt((unsigned char *)tmp,
			ASN1_STRING_data(ri->enc_key),
			ASN1_STRING_length(ri->enc_key),
			pkey);
		if (jj <= 0)
			{
			PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_EVP_LIB);
			goto err;
			}

		evp_ctx=NULL;
		BIO_get_cipher_ctx(etmp,&evp_ctx);
		EVP_CipherInit(evp_ctx,evp_cipher,NULL,NULL,0);
		if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
			return(NULL);

		if (jj != EVP_CIPHER_CTX_key_length(evp_ctx))
			{
			PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
			goto err;
			}
		EVP_CipherInit(evp_ctx,NULL,(unsigned char *)tmp,NULL,0);

		memset(tmp,0,jj);

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

#if 1
	if (p7->detached || (in_bio != NULL))
		{
		bio=in_bio;
		}
	else 
		{
		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);
		}
	BIO_push(out,bio);
	bio=NULL;
#endif
	if (0)
		{
err:
		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;
		}
	if (tmp != NULL)
		Free(tmp);
	return(out);
	}
#endif

int PKCS7_dataFinal(p7,bio)