// private string GetHexEncoded(byte[] bytes)
// {
// bytes = Hex.Encode(bytes);
//
// char[] chars = new char[bytes.Length];
//
// for (int i = 0; i != bytes.Length; i++)
// {
// chars[i] = (char)bytes[i];
// }
//
// return new string(chars);
// }
private PemObject CreatePemObject(
object obj,
string algorithm,
char[] password,
SecureRandom random)
{
if (obj == null)
{
throw new ArgumentNullException("obj");
}
if (algorithm == null)
{
throw new ArgumentNullException("algorithm");
}
if (password == null)
{
throw new ArgumentNullException("password");
}
if (random == null)
{
throw new ArgumentNullException("random");
}
if (obj is AsymmetricCipherKeyPair)
{
return(CreatePemObject(((AsymmetricCipherKeyPair)obj).Private, algorithm, password, random));
}
string type = null;
byte[] keyData = null;
if (obj is AsymmetricKeyParameter)
{
AsymmetricKeyParameter akp = (AsymmetricKeyParameter)obj;
if (akp.IsPrivate)
{
string keyType;
keyData = EncodePrivateKey(akp, out keyType);
type = keyType + " PRIVATE KEY";
}
}
if (type == null || keyData == null)
{
// TODO Support other types?
throw new PemGenerationException("Object type not supported: " + obj.GetType().FullName);
}
string dekAlgName = algorithm.ToUpperInvariant();
// Note: For backward compatibility
if (dekAlgName == "DESEDE")
{
dekAlgName = "DES-EDE3-CBC";
}
int ivLength = dekAlgName.StartsWith("AES-") ? 16 : 8;
byte[] iv = new byte[ivLength];
random.NextBytes(iv);
byte[] encData = PemUtilities.Crypt(true, keyData, password, dekAlgName, iv);
IList headers = Platform.CreateArrayList(2);
headers.Add(new PemHeader("Proc-Type", "4,ENCRYPTED"));
headers.Add(new PemHeader("DEK-Info", dekAlgName + "," + Hex.ToHexString(iv)));
return(new PemObject(type, headers, encData));
}
/**
* Read a Key Pair
*/
private object ReadPrivateKey(PemObject pemObject)
{
//
// extract the key
//
Debug.Assert(pemObject.Type.EndsWith("PRIVATE KEY"));
string type = pemObject.Type.Substring(0, pemObject.Type.Length - "PRIVATE KEY".Length).Trim();
byte[] keyBytes = pemObject.Content;
IDictionary fields = Platform.CreateHashtable();
foreach (PemHeader header in pemObject.Headers)
{
fields[header.Name] = header.Value;
}
string procType = (string)fields["Proc-Type"];
if (procType == "4,ENCRYPTED")
{
if (pFinder == null)
{
throw new PasswordException("No password finder specified, but a password is required");
}
char[] password = pFinder.GetPassword();
if (password == null)
{
throw new PasswordException("Password is null, but a password is required");
}
string dekInfo = (string)fields["DEK-Info"];
string[] tknz = dekInfo.Split(',');
string dekAlgName = tknz[0].Trim();
byte[] iv = Hex.Decode(tknz[1].Trim());
keyBytes = PemUtilities.Crypt(false, keyBytes, password, dekAlgName, iv);
}
try
{
AsymmetricKeyParameter pubSpec, privSpec;
Asn1Sequence seq = (Asn1Sequence)Asn1Object.FromByteArray(keyBytes);
switch (type)
{
case "RSA":
{
if (seq.Count != 9)
{
throw new PemException("malformed sequence in RSA private key");
}
RsaPrivateKeyStructure rsa = new RsaPrivateKeyStructure(seq);
pubSpec = new RsaKeyParameters(false, rsa.Modulus, rsa.PublicExponent);
privSpec = new RsaPrivateCrtKeyParameters(
rsa.Modulus, rsa.PublicExponent, rsa.PrivateExponent,
rsa.Prime1, rsa.Prime2, rsa.Exponent1, rsa.Exponent2,
rsa.Coefficient);
break;
}
case "DSA":
{
if (seq.Count != 6)
{
throw new PemException("malformed sequence in DSA private key");
}
// TODO Create an ASN1 object somewhere for this?
//DerInteger v = (DerInteger)seq[0];
DerInteger p = (DerInteger)seq[1];
DerInteger q = (DerInteger)seq[2];
DerInteger g = (DerInteger)seq[3];
DerInteger y = (DerInteger)seq[4];
DerInteger x = (DerInteger)seq[5];
DsaParameters parameters = new DsaParameters(p.Value, q.Value, g.Value);
privSpec = new DsaPrivateKeyParameters(x.Value, parameters);
pubSpec = new DsaPublicKeyParameters(y.Value, parameters);
break;
}
case "EC":
{
ECPrivateKeyStructure pKey = new ECPrivateKeyStructure(seq);
AlgorithmIdentifier algId = new AlgorithmIdentifier(
X9ObjectIdentifiers.IdECPublicKey, pKey.GetParameters());
PrivateKeyInfo privInfo = new PrivateKeyInfo(algId, pKey.ToAsn1Object());
// TODO Are the keys returned here ECDSA, as Java version forces?
privSpec = PrivateKeyFactory.CreateKey(privInfo);
DerBitString pubKey = pKey.GetPublicKey();
if (pubKey != null)
{
SubjectPublicKeyInfo pubInfo = new SubjectPublicKeyInfo(algId, pubKey.GetBytes());
// TODO Are the keys returned here ECDSA, as Java version forces?
pubSpec = PublicKeyFactory.CreateKey(pubInfo);
}
else
{
pubSpec = ECKeyPairGenerator.GetCorrespondingPublicKey(
(ECPrivateKeyParameters)privSpec);
}
break;
}
case "ENCRYPTED":
{
char[] password = pFinder.GetPassword();
if (password == null)
{
throw new PasswordException("Password is null, but a password is required");
}
return(PrivateKeyFactory.DecryptKey(password, EncryptedPrivateKeyInfo.GetInstance(seq)));
}
case "":
{
return(PrivateKeyFactory.CreateKey(PrivateKeyInfo.GetInstance(seq)));
}
default:
throw new ArgumentException("Unknown key type: " + type, "type");
}
return(new AsymmetricCipherKeyPair(pubSpec, privSpec));
}
catch (IOException e)
{
throw e;
}
catch (Exception e)
{
throw new PemException(
"problem creating " + type + " private key: " + e.ToString());
}
}