microsoft's tls implementation (SSPI/Schannel) returns this OID in the certificate
on the server hello handshake.

Reference: /n/sources/patch/applied/x509-add-oid
Date: Tue Sep 28 21:46:57 CES 2010
Signed-off-by: cinap_lenrek@gmx.de

--- /sys/src/libsec/port/x509.c	Tue Sep 28 21:41:13 2010
+++ /sys/src/libsec/port/x509.c	Tue Sep 28 21:41:06 2010
@@ -1581,6 +1581,7 @@
 	ALG_md4WithRSAEncryption,
 	ALG_md5WithRSAEncryption,
 	ALG_sha1WithRSAEncryption,
+	ALG_sha1WithRSAEncryptionOiw,
 	ALG_md5,
 	NUMALGS
 };
@@ -1593,6 +1594,7 @@
 static Ints7 oid_md4WithRSAEncryption = {7, 1, 2, 840, 113549, 1, 1, 3 };
 static Ints7 oid_md5WithRSAEncryption = {7, 1, 2, 840, 113549, 1, 1, 4 };
 static Ints7 oid_sha1WithRSAEncryption ={7, 1, 2, 840, 113549, 1, 1, 5 };
+static Ints7 oid_sha1WithRSAEncryptionOiw ={6, 1, 3, 14, 3, 2, 29 };
 static Ints7 oid_md5 ={6, 1, 2, 840, 113549, 2, 5, 0 };
 static Ints *alg_oid_tab[NUMALGS+1] = {
 	(Ints*)&oid_rsaEncryption,
@@ -1600,10 +1602,11 @@
 	(Ints*)&oid_md4WithRSAEncryption,
 	(Ints*)&oid_md5WithRSAEncryption,
 	(Ints*)&oid_sha1WithRSAEncryption,
+	(Ints*)&oid_sha1WithRSAEncryptionOiw,
 	(Ints*)&oid_md5,
 	nil
 };
-static DigestFun digestalg[NUMALGS+1] = { md5, md5, md5, md5, sha1, md5, nil };
+static DigestFun digestalg[NUMALGS+1] = { md5, md5, md5, md5, sha1, sha1, md5, nil };
 
 static void
 freecert(CertX509* c)