crypt32: Fix encoding OIDs with only two components.

dlls/crypt32/encode.c

@@ -796,7 +796,7 @@ BOOL WINAPI CRYPT_AsnEncodeOid(DWORD dwCertEncodingType,
         const char *ptr;
         int val1, val2;
 
-        if (sscanf(pszObjId, "%d.%d.%n", &val1, &val2, &firstPos) != 2)
+        if (sscanf(pszObjId, "%d.%d%n", &val1, &val2, &firstPos) != 2)
         {
             SetLastError(CRYPT_E_ASN1_ERROR);
             return FALSE;
@@ -804,6 +804,11 @@ BOOL WINAPI CRYPT_AsnEncodeOid(DWORD dwCertEncodingType,
         bytesNeeded++;
         firstByte = val1 * 40 + val2;
         ptr = pszObjId + firstPos;
+        if (*ptr == '.')
+        {
+            ptr++;
+            firstPos++;
+        }
         while (ret && *ptr)
         {
             int pos;

dlls/crypt32/tests/encode.c

@@ -2536,17 +2536,22 @@ static CERT_EXTENSION criticalExt =
  { oid_basic_constraints2, TRUE, { 8, crit_ext_data } };
 static CERT_EXTENSION nonCriticalExt =
  { oid_basic_constraints2, FALSE, { 8, noncrit_ext_data } };
+static CHAR oid_short[] = "1.1";
+static CERT_EXTENSION extWithShortOid =
+ { oid_short, FALSE, { 0, NULL } };
 
 static const BYTE ext0[] = { 0x30,0x00 };
 static const BYTE ext1[] = { 0x30,0x14,0x30,0x12,0x06,0x03,0x55,0x1d,0x13,0x01,0x01,
                              0xff,0x04,0x08,0x30,0x06,0x01,0x01,0xff,0x02,0x01,0x01 };
 static const BYTE ext2[] = { 0x30,0x11,0x30,0x0f,0x06,0x03,0x55,0x1d,0x13,0x04,
                              0x08,0x30,0x06,0x01,0x01,0xff,0x02,0x01,0x01 };
+static const BYTE ext3[] = { 0x30,0x07,0x30,0x05,0x06,0x01,0x29,0x04,0x00 };
 
 static const struct encodedExtensions exts[] = {
  { { 0, NULL }, ext0 },
  { { 1, &criticalExt }, ext1 },
  { { 1, &nonCriticalExt }, ext2 },
+ { { 1, &extWithShortOid }, ext3 }
 };
 
 static void test_encodeExtensions(DWORD dwEncoding)