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New function bio_hash_data()

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olszomal 2023-02-07 12:22:13 +01:00 committed by Michał Trojnara
parent 83f6ceeaea
commit b0391244a6
3 changed files with 41 additions and 26 deletions
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19
msi.c
View File

@ -12,6 +12,7 @@
#include <string.h> /* memcmp */
#include "msi.h"
#include "osslsigncode.h"
#define MIN(a,b) ((a) < (b) ? a : b)
@ -735,8 +736,6 @@ out:
/* Compute a simple sha1/sha256 message digest of the MSI file */
int msi_calc_digest(char *indata, int mdtype, u_char *mdbuf, uint32_t fileend)
{
uint32_t idx = 0, offset;
size_t written;
const EVP_MD *md = EVP_get_digestbynid(mdtype);
BIO *bhash = BIO_new(BIO_f_md());
@ -746,18 +745,12 @@ int msi_calc_digest(char *indata, int mdtype, u_char *mdbuf, uint32_t fileend)
return 0; /* FAILED */
}
BIO_push(bhash, BIO_new(BIO_s_null()));
offset = fileend;
while (idx < offset) {
uint32_t want = offset - idx;
if (want > SIZE_64K)
want = SIZE_64K;
if (!BIO_write_ex(bhash, indata + idx, want, &written)) {
BIO_free_all(bhash);
return 0; /* FAILED */
}
idx += (uint32_t)written;
if (!bio_hash_data(indata, bhash, 0, fileend)) {
printf("Unable to calculate digest\n");
BIO_free_all(bhash);
return 0; /* FAILED */
}
BIO_gets(bhash, mdbuf, EVP_MD_size(md));
BIO_gets(bhash, (char *)mdbuf, EVP_MD_size(md));
return 1; /* OK */
}

39
osslsigncode.c
View File

@ -118,6 +118,7 @@
#endif /* OPENSSL_VERSION_NUMBER>=0x30000000L */
#include "msi.h"
#include "osslsigncode.h"
#ifdef ENABLE_CURL
#ifdef __CYGWIN__
@ -795,6 +796,24 @@ static int is_content_type(PKCS7 *p7, const char *objid)
return retval;
}
int bio_hash_data(char *indata, BIO *hash, uint32_t idx, uint32_t fileend)
{
size_t written;
uint32_t want;
while (idx < fileend) {
want = fileend - idx;
if (want > SIZE_64K)
want = SIZE_64K;
if (!BIO_write_ex(hash, indata + idx, want, &written)) {
BIO_free_all(hash);
return 0; /* FAILED */
}
idx += (uint32_t)written;
}
return 1; /* OK */
}
#ifdef ENABLE_CURL
static int blob_has_nl = 0;
@ -3444,7 +3463,7 @@ static int msi_calc_MsiDigitalSignatureEx(MSI_PARAMS *msiparams, const EVP_MD *m
static int pe_calc_digest(char *indata, int mdtype, u_char *mdbuf, FILE_HEADER *header)
{
size_t written;
uint32_t idx = 0, offset;
uint32_t idx = 0, fileend;
const EVP_MD *md = EVP_get_digestbynid(mdtype);
BIO *bhash = BIO_new(BIO_f_md());
@ -3455,9 +3474,9 @@ static int pe_calc_digest(char *indata, int mdtype, u_char *mdbuf, FILE_HEADER *
}
BIO_push(bhash, BIO_new(BIO_s_null()));
if (header->sigpos)
offset = header->sigpos;
fileend = header->sigpos;
else
offset = header->fileend;
fileend = header->fileend;
/* header->header_size + 88 + 4 + 60 + header->pe32plus * 16 + 8 */
if (!BIO_write_ex(bhash, indata, header->header_size + 88, &written)
@ -3472,17 +3491,11 @@ static int pe_calc_digest(char *indata, int mdtype, u_char *mdbuf, FILE_HEADER *
return 0; /* FAILED */
}
idx += (uint32_t)written + 8;
while (idx < offset) {
uint32_t want = offset - idx;
if (want > SIZE_64K)
want = SIZE_64K;
if (!BIO_write_ex(bhash, indata + idx, want, &written)) {
BIO_free_all(bhash);
return 0; /* FAILED */
}
idx += (uint32_t)written;
if (!bio_hash_data(indata, bhash, idx, fileend)) {
printf("Unable to calculate digest\n");
BIO_free_all(bhash);
return 0; /* FAILED */
}
if (!header->sigpos) {
/* pad (with 0's) unsigned PE file to 8 byte boundary */
char *buf = OPENSSL_malloc(8);

9
osslsigncode.h Normal file
View File

@ -0,0 +1,9 @@
/*
* osslsigncode support library
*
* Copyright (C) 2021 Michał Trojnara <Michal.Trojnara@stunnel.org>
* Author: Małgorzata Olszówka <Malgorzata.Olszowka@stunnel.org>
*
*/
int bio_hash_data(char *indata, BIO *hash, uint32_t idx, uint32_t fileend);