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Use bio_hash_data() to compute a message digest value of a CAB file

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olszomal 2023-02-07 12:41:41 +01:00 committed by Michał Trojnara
parent b0391244a6
commit 11eb76d4f3
3 changed files with 19 additions and 24 deletions
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2
msi.c
View File

@ -745,7 +745,7 @@ 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()));
if (!bio_hash_data(indata, bhash, 0, fileend)) {
if (!bio_hash_data(indata, bhash, 0, 0, fileend)) {
printf("Unable to calculate digest\n");
BIO_free_all(bhash);
return 0; /* FAILED */

39
osslsigncode.c
View File

@ -796,13 +796,14 @@ 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)
int bio_hash_data(char *indata, BIO *hash, uint32_t idx, uint32_t offset, uint32_t fileend)
{
size_t written;
uint32_t want;
uint32_t start = offset ? offset : idx;
while (idx < fileend) {
want = fileend - idx;
while (start < fileend) {
want = fileend - start;
if (want > SIZE_64K)
want = SIZE_64K;
if (!BIO_write_ex(hash, indata + idx, want, &written)) {
@ -810,6 +811,7 @@ int bio_hash_data(char *indata, BIO *hash, uint32_t idx, uint32_t fileend)
return 0; /* FAILED */
}
idx += (uint32_t)written;
start += (uint32_t)written;
}
return 1; /* OK */
}
@ -3491,7 +3493,7 @@ static int pe_calc_digest(char *indata, int mdtype, u_char *mdbuf, FILE_HEADER *
return 0; /* FAILED */
}
idx += (uint32_t)written + 8;
if (!bio_hash_data(indata, bhash, idx, fileend)) {
if (!bio_hash_data(indata, bhash, idx, 0, fileend)) {
printf("Unable to calculate digest\n");
BIO_free_all(bhash);
return 0; /* FAILED */
@ -3912,8 +3914,7 @@ static int cab_verify_header(char *indata, char *infile, uint32_t filesize, FILE
/* Compute a message digest value of the signed or unsigned CAB file */
static int cab_calc_digest(char *indata, int mdtype, u_char *mdbuf, FILE_HEADER *header)
{
size_t written;
uint32_t idx = 0, offset, coffFiles;
uint32_t idx = 0, fileend, coffFiles;
const EVP_MD *md = EVP_get_digestbynid(mdtype);
BIO *bhash = BIO_new(BIO_f_md());
@ -3925,9 +3926,9 @@ static int cab_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;
/* u1 signature[4] 4643534D MSCF: 0-3 */
BIO_write(bhash, indata, 4);
@ -3980,14 +3981,14 @@ static int cab_calc_digest(char *indata, int mdtype, u_char *mdbuf, FILE_HEADER
BIO_write(bhash, indata + idx, 1);
pos++;
idx++;
} while (byte && pos < offset);
} while (byte && pos < fileend);
/* szDiskPrev */
do {
byte = GET_UINT8_LE(indata + idx);
BIO_write(bhash, indata + idx, 1);
pos++;
idx++;
} while (byte && pos < offset);
} while (byte && pos < fileend);
}
if (flags & FLAG_NEXT_CABINET) {
uint8_t byte;
@ -3997,14 +3998,14 @@ static int cab_calc_digest(char *indata, int mdtype, u_char *mdbuf, FILE_HEADER
BIO_write(bhash, indata + idx, 1);
pos++;
idx++;
} while (byte && pos < offset);
} while (byte && pos < fileend);
/* szDiskNext */
do {
byte = GET_UINT8_LE(indata + idx);
BIO_write(bhash, indata + idx, 1);
pos++;
idx++;
} while (byte && pos < offset);
} while (byte && pos < fileend);
}
/*
* (u8 * cFolders) CFFOLDER - structure contains information about
@ -4020,16 +4021,10 @@ static int cab_calc_digest(char *indata, int mdtype, u_char *mdbuf, FILE_HEADER
coffFiles = 8;
}
/* (variable) ab - the compressed data bytes */
while (coffFiles < offset) {
uint32_t want = offset - coffFiles;
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;
coffFiles += (uint32_t)written;
if (!bio_hash_data(indata, bhash, idx, coffFiles, fileend)) {
printf("Unable to calculate digest\n");
BIO_free_all(bhash);
return 0; /* FAILED */
}
BIO_gets(bhash, (char*)mdbuf, EVP_MD_size(md));
return 1; /* OK */

2
osslsigncode.h
View File

@ -6,4 +6,4 @@
*
*/
int bio_hash_data(char *indata, BIO *hash, uint32_t idx, uint32_t fileend);
int bio_hash_data(char *indata, BIO *hash, uint32_t idx, uint32_t offset, uint32_t fileend);