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crypt32: Pad R/S values with zeroes if smaller than their counterpart.

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Fixes certificate verification in Brawlhalla.
This commit is contained in:
Hans Leidekker 2024-01-08 15:24:11 +01:00 committed by Alexandre Julliard
parent 47349f3422
commit 0ceb41a5fd
1 changed files with 10 additions and 5 deletions
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15
dlls/crypt32/cert.c
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@ -2778,32 +2778,37 @@ BOOL CNG_ImportPubKey(CERT_PUBLIC_KEY_INFO *pubKeyInfo, BCRYPT_KEY_HANDLE *key)
static BOOL CNG_PrepareSignatureECC(BYTE *encoded_sig, DWORD encoded_size, BYTE **sig_value, DWORD *sig_len)
{
CERT_ECC_SIGNATURE *ecc_sig;
DWORD size;
DWORD size, r_size, s_size, r_offset, s_offset;
int i;
if (!CryptDecodeObjectEx(X509_ASN_ENCODING, X509_ECC_SIGNATURE, encoded_sig, encoded_size,
CRYPT_DECODE_ALLOC_FLAG, NULL, &ecc_sig, &size))
return FALSE;
if (!ecc_sig->r.cbData || !ecc_sig->s.cbData)
if (!(r_size = ecc_sig->r.cbData) || !(s_size = ecc_sig->s.cbData))
{
LocalFree(ecc_sig);
SetLastError(ERROR_INVALID_DATA);
return FALSE;
}
r_size = s_size = max( r_size, s_size );
*sig_len = ecc_sig->r.cbData + ecc_sig->s.cbData;
*sig_len = r_size + s_size;
if (!(*sig_value = CryptMemAlloc(*sig_len)))
{
LocalFree(ecc_sig);
SetLastError(ERROR_OUTOFMEMORY);
return FALSE;
}
memset( *sig_value, 0, *sig_len );
r_offset = r_size - ecc_sig->r.cbData;
s_offset = s_size - ecc_sig->s.cbData;
for (i = 0; i < ecc_sig->r.cbData; i++)
(*sig_value)[i] = ecc_sig->r.pbData[ecc_sig->r.cbData - i - 1];
(*sig_value)[i + r_offset] = ecc_sig->r.pbData[ecc_sig->r.cbData - i - 1];
for (i = 0; i < ecc_sig->s.cbData; i++)
(*sig_value)[ecc_sig->r.cbData + i] = ecc_sig->s.pbData[ecc_sig->s.cbData - i - 1];
(*sig_value)[r_size + i + s_offset] = ecc_sig->s.pbData[ecc_sig->s.cbData - i - 1];
LocalFree(ecc_sig);
return TRUE;