int PKCS7_signatureVerify_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si, X509 *x509,
const unsigned char* data, size_t len, int hash)
{
ASN1_OCTET_STRING *os;
const EVP_MD* md;
EVP_MD_CTX mdc, mdc_tmp;
int ret = 0, i;
int md_type;
STACK_OF(X509_ATTRIBUTE) *sk;
EVP_PKEY *pkey = NULL;
EVP_MD_CTX_init(&mdc);
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);
md = EVP_get_digestbynid(md_type);
if (!md || !data || (hash && len != (size_t) md->ctx_size) )
goto err;
if (!EVP_DigestInit_ex(&mdc, md, NULL))
goto err;
if (hash)
memcpy(mdc.md_data, data, len);
else
EVP_DigestUpdate(&mdc, data, len);
pkey = X509_get_pubkey(x509);
if (!pkey)
{
ret = -1;
goto err;
}
/*
* 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)))
{
PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_DIGEST_FAILURE);
ret = -1;
goto err;
}
if (!EVP_DigestVerifyInit(&mdc_tmp, NULL, EVP_get_digestbynid(md_type), NULL, pkey))
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;
i = EVP_VerifyFinal(&mdc_tmp, os->data, os->length, pkey);
if (i <= 0)
{
PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_SIGNATURE_FAILURE);
ret = -1;
goto err;
}
else
ret = 1;
err:
EVP_PKEY_free(pkey);
EVP_MD_CTX_cleanup(&mdc);
EVP_MD_CTX_cleanup(&mdc_tmp);
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);
}
int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
X509 *x509)
{
ASN1_OCTET_STRING *os;
EVP_MD_CTX mdc_tmp,*mdc;
unsigned char *pp,*p;
int ret=0,i;
int md_type;
STACK_OF(X509_ATTRIBUTE) *sk;
BIO *btmp;
EVP_PKEY *pkey;
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,
PKCS7_R_INTERNAL_ERROR);
goto err;
}
if (EVP_MD_CTX_type(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 */
memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));
sk=si->auth_attr;
if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
{
unsigned char md_dat[EVP_MAX_MD_SIZE];
unsigned int md_len;
ASN1_OCTET_STRING *message_digest;
EVP_DigestFinal(&mdc_tmp,md_dat,&md_len);
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;
}
EVP_VerifyInit(&mdc_tmp,EVP_get_digestbynid(md_type));
/* Note: when forming the encoding of the attributes we
* shouldn't reorder them or this will break the signature.
* This is done by using the IS_SEQUENCE flag.
*/
i=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL,i2d_X509_ATTRIBUTE,
V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
pp=OPENSSL_malloc(i);
p=pp;
i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p,i2d_X509_ATTRIBUTE,
V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
EVP_VerifyUpdate(&mdc_tmp,pp,i);
OPENSSL_free(pp);
}
os=si->enc_digest;
pkey = X509_get_pubkey(x509);
if (!pkey)
{
ret = -1;
goto err;
}
#ifndef NO_DSA
if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
#endif
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:
return(ret);
}
