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[crypto] backport certificate alg detection

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use the more robust code from FreeRDP 3.0 to detect the hash algorightm
of a certificate
This commit is contained in:
Armin Novak 2023-09-04 13:32:51 +02:00 committed by akallabeth
parent 9d3d40bf3e
commit e93433fb21
1 changed files with 4 additions and 2 deletions
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6
libfreerdp/crypto/crypto.c
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@ -950,10 +950,12 @@ WINPR_MD_TYPE crypto_cert_get_signature_alg(X509* xcert)
{
WINPR_ASSERT(xcert);
const int nid = X509_get_signature_nid(xcert);
EVP_PKEY* evp = X509_get0_pubkey(xcert);
WINPR_ASSERT(evp);
int hash_nid = 0;
if (OBJ_find_sigid_algs(nid, &hash_nid, NULL) != 1)
const int res = EVP_PKEY_get_default_digest_nid(evp, &hash_nid);
if (res <= 0)
return WINPR_MD_NONE;
switch (hash_nid)