pk7_doit.c

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/* crypto/pkcs7/pk7_doit.c */
/* Copyright (C) 1995-1998 Eric Young ([email protected])
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young ([email protected]).
 * 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 ([email protected]).
 * 
 * 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 ([email protected])"
 *    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 ([email protected])"
 * 
 * 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;

    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;

    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);
        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;
        }

    /* 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 (PKCS7_is_detached(p7) || (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;

    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);
            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);
            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) && !(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);
    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 (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);
    }