/*
* Generic parsing. If 'strictStrings' is true, then the following
* rules are enforced:
* -- Every SET in the sequence of RDN must have size 1.
* -- Every name element is decoded as a string (by tag).
*
* If 'strictStrings' is false, then multiple elements may appear
* in each SET, and values needs not be decodable as string (values
* with a known OID must still be decodable).
*
* This constructor checks that within a single RDN, no two
* attributes may have the same type.
*
* On decoding error, an AsnException is thrown.
*/
public X500Name(AsnElt aDN, bool strictStrings)
{
/*
* Note: the SEQUENCE tag MUST be present, since the
* ASN.1 definition of Name starts with a CHOICE; thus,
* any tag override would have to be explicit, not
* implicit.
*/
aDN.CheckConstructed();
aDN.CheckTag(AsnElt.SEQUENCE);
List <List <DNPart> > r = new List <List <DNPart> >();
foreach (AsnElt aRDN in aDN.Sub)
{
aRDN.CheckConstructed();
aRDN.CheckTag(AsnElt.SET);
aRDN.CheckNumSubMin(1);
int n = aRDN.Sub.Length;
if (n != 1 && strictStrings)
{
throw new AsnException(String.Format(
"several ({0}) values in RDN", n));
}
List <DNPart> r2 = new List <DNPart>();
r.Add(r2);
for (int i = 0; i < n; i++)
{
AsnElt aTV = aRDN.Sub[i];
aTV.CheckConstructed();
aTV.CheckTag(AsnElt.SEQUENCE);
aTV.CheckNumSub(2);
AsnElt aOID = aTV.GetSub(0);
aOID.CheckTag(AsnElt.OBJECT_IDENTIFIER);
AsnElt aVal = aTV.GetSub(1);
string nt = aOID.GetOID();
DNPart dnp = new DNPart(nt, aVal);
if (strictStrings && !dnp.IsString)
{
throw new AsnException(
"RDN is not a string");
}
r2.Add(dnp);
}
}
Init(r);
}
void ProcessAltNames(byte[] extVal, bool forIssuer)
{
/*
* Alternative names processing.
*
* If the extension contains an X.500 name, and the
* corresponding DN in the certificate TBS is empty,
* then that X.500 name will be used as subjectDN or
* issuerDN. However, if the extension contains several
* X.500 names, or if the DN in the TBS is non-empty,
* then the X.500 name(s) in the extension will be
* ignored.
*
* For the subject, we also gather dNSNames into
* the "serverNames" array.
*/
List <string> dnsNames = new List <string>();
AsnElt ae = AsnElt.Decode(extVal);
ae.CheckTag(AsnElt.SEQUENCE);
ae.CheckConstructed();
bool foundDN = false;
X500Name dn = null;
foreach (AsnElt agn in ae.Sub)
{
if (agn.TagClass != AsnElt.CONTEXT)
{
continue;
}
switch (agn.TagValue)
{
case 2:
dnsNames.Add(agn.GetString(AsnElt.IA5String));
break;
case 4:
/*
* Since "Name" is a CHOICE, the context
* tag applied on it as part of the
* GeneralName structure is EXPLICIT. We
* have to remove it.
*/
agn.CheckNumSub(1);
AsnElt adn = agn.GetSub(0);
if (!foundDN)
{
dn = new X500Name(adn, false);
}
else
{
dn = null;
}
foundDN = true;
break;
}
}
if (foundDN && dn != null)
{
if (forIssuer)
{
if (issuerDN.IsEmpty)
{
issuerDN = dn;
}
}
else
{
if (subjectDN.IsEmpty)
{
subjectDN = dn;
}
}
}
if (!forIssuer && dnsNames.Count > 0)
{
serverNames = dnsNames.ToArray();
}
}
/*
* Decode the provided private key. This method accepts both
* PKCS#8 and the "internal" format; the source object may be
* raw DER, Base64-encoded DER, or PEM. The key type is
* automatically detected.
*/
public static IPrivateKey DecodePrivateKey(byte[] enc)
{
string pemType;
enc = AsnIO.FindBER(enc, false, out pemType);
if (enc == null)
{
throw new AsnException("Not an encoded object");
}
AsnElt ak = AsnElt.Decode(enc);
ak.CheckConstructed();
if (pemType != null)
{
switch (pemType)
{
case "RSA PRIVATE KEY":
return(DecodePrivateKeyRSA(ak));
/* disabled DSA
* case "DSA PRIVATE KEY":
* return DecodePrivateKeyDSA(ak);
*/
case "EC PRIVATE KEY":
return(DecodePrivateKeyEC(ak));
case "PRIVATE KEY":
return(DecodePrivateKeyPKCS8(ak));
default:
throw new AsnException(
"Unknown PEM object: " + pemType);
}
}
if (ak.Sub.Length == 3 &&
ak.GetSub(0).TagValue == AsnElt.INTEGER &&
ak.GetSub(1).TagValue == AsnElt.SEQUENCE &&
ak.GetSub(2).TagValue == AsnElt.OCTET_STRING)
{
return(DecodePrivateKeyPKCS8(ak));
}
if (ak.Sub.Length >= 9)
{
bool mayBeRSA = true;
for (int i = 0; i < 9; i++)
{
if (ak.GetSub(i).TagValue != AsnElt.INTEGER)
{
mayBeRSA = false;
break;
}
}
if (mayBeRSA)
{
return(DecodePrivateKeyRSA(ak));
}
}
/* disabled DSA
* if (ak.Sub.Length >= 6) {
* bool mayBeDSA = true;
* for (int i = 0; i < 6; i ++) {
* if (ak.GetSub(i).TagValue != AsnElt.INTEGER) {
* mayBeDSA = false;
* break;
* }
* }
* if (mayBeDSA) {
* return DecodePrivateKeyDSA(ak);
* }
* }
*/
if (ak.Sub.Length >= 2 &&
ak.GetSub(0).TagValue == AsnElt.INTEGER &&
ak.GetSub(1).TagValue == AsnElt.OCTET_STRING)
{
return(DecodePrivateKeyEC(ak));
}
throw new AsnException("Unrecognized private key format");
}
