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speed up checksum calculation (patch from Veselin Georgiev)

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Per Allansson 2015-01-06 09:08:26 +01:00
parent a912601140
commit 0c15ccc4db
1 changed files with 17 additions and 7 deletions
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24
osslsigncode.c
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@ -995,19 +995,29 @@ static void get_indirect_data_blob(u_char **blob, int *len, const EVP_MD *md, fi
static unsigned int calc_pe_checksum(BIO *bio, unsigned int peheader)
{
unsigned int checkSum = 0;
unsigned short val;
unsigned short val;
unsigned int size = 0;
unsigned short *buf;
int nread;
/* recalc checksum. */
buf = (unsigned short*)malloc(sizeof(unsigned short)*32768);
(void)BIO_seek(bio, 0);
while (BIO_read(bio, &val, 2) == 2) {
if (size == peheader + 88 || size == peheader + 90)
val = 0;
checkSum += val;
checkSum = 0xffff & (checkSum + (checkSum >> 0x10));
size += 2;
while ((nread = BIO_read(bio, buf, sizeof(unsigned short)*32768)) > 0) {
int i;
for (i = 0; i < nread / 2; i++) {
val = buf[i];
if (size == peheader + 88 || size == peheader + 90)
val = 0;
checkSum += val;
checkSum = 0xffff & (checkSum + (checkSum >> 0x10));
size += 2;
}
}
free(buf);
checkSum = 0xffff & (checkSum + (checkSum >> 0x10));
checkSum += size;