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 "rand.h"
#include "objects.h"
#include "x509.h"
BIO *PKCS7_dataInit(p7,bio)
PKCS7 *p7;
BIO *bio;
{
int i,j;
BIO *out=NULL,*btmp;
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;
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) 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);
}
}
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) 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);
/* 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) abort();
pkey=X509_get_pubkey(ri->cert);
jj=EVP_PKEY_size(pkey);
if (max < jj) max=jj;
}
if ((tmp=(unsigned char *)Malloc(max)) == NULL) abort();
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) abort();
ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj);
}
BIO_set_cipher(btmp,evp_cipher,key,iv,1);
if (out == NULL)
out=btmp;
else
BIO_push(out,btmp);
}
if (bio == NULL) /* ??????????? */
{
if (p7->detached)
bio=BIO_new(BIO_s_null());
else
{
bio=BIO_new(BIO_s_mem());
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);
return(out);
err:
return(NULL);
}
int PKCS7_dataSign(p7,bio)
PKCS7 *p7;
BIO *bio;
{
int ret=0;
int i,j;
BIO *btmp;
BUF_MEM *buf_mem=NULL;
BUF_MEM *buf=NULL;
PKCS7_SIGNER_INFO *si;
EVP_MD_CTX *mdc,ctx_tmp;
STACK *sk,*si_sk=NULL;
unsigned char *p,*pp=NULL;
int x;
ASN1_OCTET_STRING *os=NULL;
i=OBJ_obj2nid(p7->type);
p7->state=PKCS7_S_HEADER;
switch (i)
{
case NID_pkcs7_signedAndEnveloped:
/* XXXXXXXXXXXXXXXX */
si_sk=p7->d.signed_and_enveloped->signer_info;
os=ASN1_OCTET_STRING_new();
p7->d.signed_and_enveloped->enc_data->enc_data=os;
break;
case NID_pkcs7_signed:
si_sk=p7->d.sign->signer_info;
os=p7->d.sign->contents->d.data;
break;
}
if (si_sk != NULL)
{
if ((buf=BUF_MEM_new()) == NULL) goto err;
for (i=0; i<sk_num(si_sk); i++)
{
si=(PKCS7_SIGNER_INFO *)
sk_value(si_sk,i);
if (si->pkey == NULL)
continue;
j=OBJ_obj2nid(si->digest_enc_alg->algorithm);
btmp=bio;
for (;;)
{
if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD))
== NULL)
{
PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
goto err;
}
BIO_get_md_ctx(btmp,&mdc);
if (mdc == NULL)
{
PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_INTERNAL_ERROR);
goto err;
}
if (EVP_MD_pkey_type(EVP_MD_CTX_type(mdc)) == j)
break;
else
btmp=btmp->next_bio;
}
/* We now have the EVP_MD_CTX, lets do the
* signing. */
memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
goto err;
sk=si->auth_attr;
if ((sk != NULL) && (sk_num(sk) != 0))
{
x=i2d_ASN1_SET(sk,NULL,i2d_X509_ATTRIBUTE,
V_ASN1_SET,V_ASN1_UNIVERSAL);
pp=(unsigned char *)Malloc(i);
p=pp;
i2d_ASN1_SET(sk,&p,i2d_X509_ATTRIBUTE,
V_ASN1_SET,V_ASN1_UNIVERSAL);
EVP_SignUpdate(&ctx_tmp,pp,x);
Free(pp);
}
if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
(unsigned int *)&buf->length,si->pkey))
goto err;
if (!ASN1_STRING_set(si->enc_digest,
(unsigned char *)buf->data,buf->length))
goto err;
}
if (p7->detached)
ASN1_OCTET_STRING_set(os,(unsigned char *)"",0);
else
{
btmp=BIO_find_type(bio,BIO_TYPE_MEM);
if (btmp == NULL)
{
PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
goto err;
}
BIO_get_mem_ptr(btmp,&buf_mem);
ASN1_OCTET_STRING_set(os,
(unsigned char *)buf_mem->data,buf_mem->length);
}
if (pp != NULL) Free(pp);
pp=NULL;
}
ret=1;
err:
if (buf != NULL) BUF_MEM_free(buf);
return(ret);
}
int PKCS7_dataVerify(cert_store,ctx,bio,p7,si)
X509_STORE *cert_store;
X509_STORE_CTX *ctx;
BIO *bio;
PKCS7 *p7;
PKCS7_SIGNER_INFO *si;
{
PKCS7_SIGNED *s;
ASN1_OCTET_STRING *os;
EVP_MD_CTX mdc_tmp,*mdc;
unsigned char *pp,*p;
PKCS7_ISSUER_AND_SERIAL *ias;
int ret=0,md_type,i;
STACK *sk;
BIO *btmp;
X509 *x509;
if (!PKCS7_type_is_signed(p7)) abort();
/* XXXXXXXXXXXXXXXXXXXXXXX */
ias=si->issuer_and_serial;
s=p7->d.sign;
x509=X509_find_by_issuer_and_serial(s->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 */
X509_STORE_CTX_init(ctx,cert_store,x509,s->cert);
i=X509_verify_cert(ctx);
if (i <= 0) goto err;
X509_STORE_CTX_cleanup(ctx);
/* So we like 'x509', lets check the signature. */
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_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
goto err;
}
BIO_get_md_ctx(btmp,&mdc);
if (mdc == NULL)
{
PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_INTERNAL_ERROR);
goto err;
}
if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == md_type)
break;
btmp=btmp->next_bio;
}
/* mdc is the digest ctx that we want */
memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));
sk=si->auth_attr;
if ((sk != NULL) && (sk_num(sk) != 0))
{
i=i2d_ASN1_SET(sk,NULL,i2d_X509_ATTRIBUTE,
V_ASN1_SET,V_ASN1_UNIVERSAL);
pp=(unsigned char *)malloc(i);
p=pp;
i2d_ASN1_SET(sk,&p,i2d_X509_ATTRIBUTE,
V_ASN1_SET,V_ASN1_UNIVERSAL);
EVP_VerifyUpdate(&mdc_tmp,pp,i);
free(pp);
}
os=si->enc_digest;
i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length,
X509_get_pubkey(x509));
if (i <= 0)
{
PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_SIGNATURE_FAILURE);
ret= -1;
goto err;
}
else
ret=1;
err:
return(ret);
}
