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using System;
using System.IO;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Tls
{
public sealed class TrustedAuthority
{
private readonly short m_identifierType;
private readonly object m_identifier;
public TrustedAuthority(short identifierType, object identifier)
{
if (!IsCorrectType(identifierType, identifier))
throw new ArgumentException("not an instance of the correct type", "identifier");
this.m_identifierType = identifierType;
this.m_identifier = identifier;
}
public short IdentifierType
{
get { return m_identifierType; }
}
public object Identifier
{
get { return m_identifier; }
}
public byte[] GetCertSha1Hash()
{
return Arrays.Clone((byte[])m_identifier);
}
public byte[] GetKeySha1Hash()
{
return Arrays.Clone((byte[])m_identifier);
}
public X509Name X509Name
{
get
{
CheckCorrectType(Tls.IdentifierType.x509_name);
return (X509Name)m_identifier;
}
}
/// <summary>Encode this <see cref="TrustedAuthority"/> to a <see cref="Stream"/>.</summary>
/// <param name="output">the <see cref="Stream"/> to encode to.</param>
/// <exception cref="IOException"/>
public void Encode(Stream output)
{
TlsUtilities.WriteUint8(m_identifierType, output);
switch (m_identifierType)
{
case Tls.IdentifierType.cert_sha1_hash:
case Tls.IdentifierType.key_sha1_hash:
{
byte[] sha1Hash = (byte[])m_identifier;
output.Write(sha1Hash, 0, sha1Hash.Length);
break;
}
case Tls.IdentifierType.pre_agreed:
{
break;
}
case Tls.IdentifierType.x509_name:
{
X509Name dn = (X509Name)m_identifier;
byte[] derEncoding = dn.GetEncoded(Asn1Encodable.Der);
TlsUtilities.WriteOpaque16(derEncoding, output);
break;
}
default:
throw new TlsFatalAlert(AlertDescription.internal_error);
}
}
/// <summary>Parse a <see cref="TrustedAuthority"/> from a <see cref="Stream"/>.</summary>
/// <param name="input">the <see cref="Stream"/> to parse from.</param>
/// <returns>a <see cref="TrustedAuthority"/> object.</returns>
/// <exception cref="IOException"/>
public static TrustedAuthority Parse(Stream input)
{
short identifier_type = TlsUtilities.ReadUint8(input);
object identifier;
switch (identifier_type)
{
case Tls.IdentifierType.cert_sha1_hash:
case Tls.IdentifierType.key_sha1_hash:
{
identifier = TlsUtilities.ReadFully(20, input);
break;
}
case Tls.IdentifierType.pre_agreed:
{
identifier = null;
break;
}
case Tls.IdentifierType.x509_name:
{
byte[] derEncoding = TlsUtilities.ReadOpaque16(input, 1);
Asn1Object asn1 = TlsUtilities.ReadAsn1Object(derEncoding);
X509Name x509Name = X509Name.GetInstance(asn1);
TlsUtilities.RequireDerEncoding(x509Name, derEncoding);
identifier = x509Name;
break;
}
default:
throw new TlsFatalAlert(AlertDescription.decode_error);
}
return new TrustedAuthority(identifier_type, identifier);
}
private void CheckCorrectType(short expectedIdentifierType)
{
if (m_identifierType != expectedIdentifierType || !IsCorrectType(expectedIdentifierType, m_identifier))
throw new InvalidOperationException("TrustedAuthority is not of type "
+ Tls.IdentifierType.GetName(expectedIdentifierType));
}
private static bool IsCorrectType(short identifierType, object identifier)
{
switch (identifierType)
{
case Tls.IdentifierType.cert_sha1_hash:
case Tls.IdentifierType.key_sha1_hash:
return IsSha1Hash(identifier);
case Tls.IdentifierType.pre_agreed:
return identifier == null;
case Tls.IdentifierType.x509_name:
return identifier is X509Name;
default:
throw new ArgumentException("unsupported IdentifierType", "identifierType");
}
}
private static bool IsSha1Hash(object identifier)
{
return identifier is byte[] && ((byte[])identifier).Length == 20;
}
}
}
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